HITACHI RAS-FSXNH Air Conditioning Instruction Manual

INSTALLATION AND OPERATION MANUAL
SET FREE SERIES
FSXNH

RAS-FSXNH Air Conditioning

Specifications in this manual are subject to change without notice in order that HITACHI may bring the latest innovations to their customers. Whilst every effort is made to ensure that all specifications are correct, printing errors are beyond Hitachi’s control; Hitachi cannot be held responsible for these errors.
CAUTION
This product shall not be mixed with general house waste at the end of its life and it shall be retired according to the appropriated local or national regulations in a environmentally correct way.
Due to the refrigerant, oil and other components contained in Air Conditioner, its dismantling must be done by a professional installer according to the applicable regulations.
Contact to the corresponding authorities for more information.
From 4th July 2007 and following Regulation EC Nº 842/2006 on Certain Fluorinated Greenhouse gases, it is mandatory to fill in the label attached to the unit with the total amount of refrigerant charged on the installation.
Do not vent R410A/R407C into the atmosphere: R410A R407C are fluorinated greenhouse gases covered by the Kyoto protocol global warming potential (GWP) R410A/R407C: = 1975/1652.5.

Instructions to fi ll in the F-Gas Label:

1. Fill in the Label with indelible ink the refrigerant amounts: 1 – Factory Charge, 2 – Additional Charge 3 – Total Charge.
2. Stick the Protection Plastic Film on the F-Gas Label (delivered in a plastic bag with the Manual). To see Figure nº 2.

DANGER – Hazards or unsafe practices which COULD result in severe personal injuries or death.
CAUTION – Hazards or unsafe practices which COULD result in minor personal injury or product or property damage.
NOTE – The text following this symbol contains information or instructions that may be of use or that require a more thorough explanation.

OUTDOOR UNIT

RAS FSXNH

| | | |
---|---|---|---|---
RAS-5FSxNH| RAS-8FSxNH| RAS-12FSxNH-P| RAS-16FSxNH| RAS-24FSxNH-P
RAS-6FSxNH| RAS-10FSxNH| RAS-14FSxNH| RAS-18FSxNH| RAS-26FSxNH
| RAS-12FSxNH| | RAS-20FSxNH| RAS-28FSxNH
| | | RAS-22FSxNH| RAS-30FSxNH
| | | RAS-24FSxNH| RAS-32FSxNH
| | | | RAS-34FSxNH
| | | | RAS-36FSxNH

INDOOR UNIT ·

INDOOR UNIT ·

RPFI-1.0FSN2E
RPIM-1.5FSN4E(-DU)| RPI-1.5FSN4E| | RPK-1.5FSN(H)3M| RPF-1.5FSN2E| RPFI-1.5FSN2E
| RPI-2.0FSN4E| | RPK-2.0FSN3M| RPF-2.0FSN2E| RPFI-2.0FSN2E
| RPI-2.5FSN4E| | RPK-2.5FSN3M| RPF-2.5FSN2E| RPFI-2.5FSN2E
| RPI-3.0FSN4E| | RPK-3.0FSN3M| |
| RPI-4.0FSN4E| | RPK-4.0FSN3M| |
| RPI-5.0FSN4E| | | |
| RPI-6.0FSN4E| | | |
| | RPI-8.0FSN2E| | |
| | RPI-10.0FSN2E| | |

GENERAl INFORMATION

1.1 GENERAl NOTES
No part of this publication may be reproduced, copied, filed or transmitted in any shape or form without the permission of HITACHI Air Conditioning Products Europe, S.A. Within the policy of continuous improvement of its products, HITACHI Air Conditioning Products Europe, S.A. reserves the right to make changes at any time without prior notification and without being compelled to introducing them into products subsequently sold. This document may therefore have been subject to amendments during the life of the product.
HITACHI makes every effort to offer correct, up-to-date documentation. Despite this, printing errors cannot be controlled by HITACHI and are not its responsibility.
As a result, some of the images or data used to illustrate this document may not refer to specific models.
No claims will be accepted based on the data, illustrations and descriptions included in this manual. No type of modification must be made to the equipment without prior, written authorisation from the manufacturer.

1.2 PRODUCT GUIDE

1.2.1 Prior check

NOTE
Check, depending on the name of the model, the type of air conditioning system fitted, the abbreviated code and reference in this instruction manual. This Installation and Operating Manual only refers to SET FREE RAS-(5-36)FSXNH outdoor units combined with indoor units from the SYSTEM FREE series. Check, in accordance with the Installation and Operating Manuals included with the outdoor and indoor units, that all the information necessary for the correct installation of the system is included. If this is not the case, please contact your distributor.

1.2.2 Classification of outdoor unit models

1.2.3 special models RAs12FsXNh-P and RAs-24FsXNh-P
The special models RAS-12FSXNH-P and RAS-24FSXNH-P are aimed for installations where high performance is required.
Specific data for these units, like capacities and efficiency, is shown in in the General Data chapter in the Technical Catalogue, and the selection data, like nominal capacity tables and the capacity tables according to the total power of combined indoor units, is available in chapter Capacities and selection data in the Technical Catalogue.
The instructions for installation, piping, commissioning, maintenance and other works are the same for each pair of models shown below.
RAS-12FSxNH-P —–> RAS-14FSxNH
RAS-24FSxNH-P —–> RAS-26FSxNH
Therefore there are no specific instructions shown for these special models.

1.2.4 Combination of outdoor units
The power range of the RAS-(5-36)FSXNH(-P) outdoor units is obtained by applying one unit (RAS-(5-12)FSXNH) or by the combination of two or three outdoor units (RAS-(14-36)FSXNH), depending on the instructions in the following
tables.
This outdoor unit series FSXNH (high efficiency type) can build the capacity from 5 to 36HP by combining maximum 3 outdoor units from 5 to 12HP.

* Base units

* Combination of base units

The outdoor unit from 14 to 36HP consists of the combination of 2 to 3 base units.
The combinations are not available except the above table.

1.3 SAFETY
1.3.1 symbols used

During normal air conditioning system design work or unit installation, greater attention must be paid in certain situations requiring particular care in order to avoid injuries and damage to the unit, the installation or the building or property.
Situations that jeopardise the safety of those in the surrounding area or that put the unit itself at risk will be clearly indicated in this manual.  To indicate these situations, a series of special symbols will be used to clearly identify these situations.
Pay close attention to these symbols and to the messages following them, as your safety  and that of others depends on it.

DANGER

• The text following this symbol contains information and instructions relating directly to your safety and physical wellbeing.
• Not taking these instructions into account could lead to serious, very serious or even fatal injuries to you and others in the proximities of the unit.

In the texts following the danger symbol you can also find information on safe procedures  duringunit installation.

CAUTION

• The text following this symbol contains information and instructions relating directly to your safety and physical wellbeing.
• Not taking these instructions into account could lead to minor injuries to you and others in the proximities of the unit.
• Not taking these instructions into account could lead to unit damage.

In the texts following the caution symbol you can also find information on safe procedures during unit installation.
NOTE

• The text following this symbol contains information or instructions that may be of use or that require a more thorough explanation.
• Instructions regarding inspections to be made on unit parts or systems may also be included.

1.3.2 Additional information about safety

DANGER

• HITACHI is not able to foresee all the circumstances which may result in a potential danger.
• Do not pour water in the indoor or outdoor unit. These products are fitted with electric components. If water comes into contact with electric components, this will cause a serious electric shock.
• Do not handle or adjust the safety devices inside the indoor and outdoor units. The handling or adjustment of these devices may result in serious accident.
• Do not open the service cover or access panel of the indoor and outdoor units without disconnecting the main supply.
• In the event of fire, switch off the mains, put out the fire immediately and contact your service supplier.
• Check that the earth cable is correctly connected.
• Connect the unit to a circuit breaker of the specified capacity.

CAUTION
This unit is designed for commercial and light industrial application.
If installed in household appliances, it could cause electromagnetic interference.

CAUTION

• Refrigerant leaks may hinder respiration as the gas displaces the air in the room.

• Fit the indoor unit, the outdoor unit, the remote control and the cable at a minimum of 3 metres away from sources of strong radiation from electromagnetic waves, such as medical equipment.

• Do not use sprays, such as insecticides, varnishes or enamels or any other inflammable gas within a metre of the system.

• If the circuit breaker or supply fuse of the unit comes on frequently, stop the system and contact the service suppler.

• Do not carry out maintenance or inspection work yourself.
  This work must be carried out by qualified service personnel with suitable tools and resources for the work.

• Do not place any foreign material (branches, sticks, etc.) in the air inlet or outlet of the unit. These units are fitted with high speed fans and contact with any object is dangerous.

• This appliance must be used only by adult and capable people, having received the technical information or instructions to handle this appliance properly and safely.

• Children should be supervised to ensure that they do not play with the appliance.

• RAS-(5-36)FSXNH(-P) outdoor units are designed for commercial use and for light industrial application. If installed in house hold appliance, it could cause electromagnetic interference.

NOTE

• The air in the room should be renewed and the room ventilated every 3 or 4 hours.
• The system fitter and specialist shall provide anti-leak safety in accordance with local regulations.
• This air conditioner has been designed for standard air conditioning for human beings. For use in other applications, please contact your HITACHI dealer or service contractor.

1.3.3 Pressure vessel and safety device

This air conditioning equipment is fitted with a high pressure vessel in accordance with the directive on pressure equipment. The recipient has been designed and tested prior to dispatch in accordance with said directive. In addition, in order to avoid abnormal pressures in the equipment, a high pressure switch is fitted in the refrigerant system. This does not require any adjustment. As a result, the air conditioning unit is protected against abnormal pressures.
DANGER
Do not handle, modify or change the high pressure switch n the air conditioning unit. If abnormally high pressure is applied to the elements in the air conditioning unit refrigerant cycle, including the high pressure vessels, these could explode resulting in serious injury or loss of life.

NOTE

• The label indicating compliance with the directive on pressure equipment, the vessel category and capacity is located on the vessel itself.
• The high pressure switch is marked on the electric circuit diagrams of the outdoor unit as PSH and is connected to the printed circuit board PCB1 of the unit.

Technical specifications of the high-pressure switch: See on Control and safety devices.

Start-up and operation:

• Check that all the stop valves are fully open.
• Check that there are no obstacles on the sides of the air conditioning unit inlet/outlet before start-up and during operation.

During maintenance, the high pressure side should be checked regularly. If the pressure is higher than the maximum permitted pressure, stop the system and clean the heat exchanger or remove the cause of the excess pressure.

PURPOSE OF THIS MANUAl

The air conditioning system should only be installed by qualified personnel, with the necessary resources, tools and equipment, who are familiar with the safety procedures required to successfully carry out the installation.

The air conditioning system should only be installed by qualified personnel, with the necessary resources, tools and equipment, who are familiar with the safety procedures required to success- fully carry out the installation.

PLEASE READ AND FAMILIARISE YOURSELF WITH THE MANUAL BEFORE STARTING WORK ON THE INSTALLA- TION OF THE AIR CONDITIONING SYSTEM. Failure to observe the instructions for installation, use and operation described in this Manual may result in operating failure including potentially serious faults, or even the destruction of the air conditioning system.
It is assumed that the air conditioning system will be installed and maintained by responsible personnel trained for the purpose. If this is not the case, the customer should include all the safety, caution and operating signs in the native language of the personnel responsible.
Do not install the unit in the following places, as this may lead to a fire, deformities, rusting or faults:

• Places where oil is present (including oil for machinery).
• Places with a high concentration of sulphurous gas, such as Spas.
• Places where flammable gases may be generated or circulate.
• Places with a saline, acidic or alkaline atmosphere.

Do not install the unit in places where silicon gas is present. Any silicon gas deposited on the surface of the heat exchanger will repel water. As a result, the condensate water will splash out of the collection tray and into the electrical box. Water leaks or electrical faults may eventually be caused.
Do not install the unit in a place where the current of expelled air directly affects animals or plants as they could be adversely affected.

1.5 WORKING RANGE

This heat pump and heat recovery system has been designed for the following temperatures. Use the system within this range.
The system can provide refrigeration or heating or can provide refrigeration and heating at the same time.
The following table indicates the temperature range.

Indoor
temperature| Min.| 21 ºC DB / 15 ºC WB| 15 ºC DB
Max.| 32 ºC DB / 23 ºC WB| 27 ºC DB
Outdoor
temperature| Min.| -5 ºC DB(1)| 20 ºC WB (2)
Max.| 43 ºC DB| 15 ºC WB

(1) (10 – -5) °C DB, operating control range.
(2) (-12 – -20) °C WB, operating control range.

NOTE
DB: dry bulb; WB: wet bulb.

REMOTE CONTROl OPERATION

There are two types of wired remote control: PC-ART and PC-ARF.
Refer to the Installation and Operations Manual of the remote controller.

2.1 PC-ART REMOTE CONTROl (AS AN EXAMPlE OF CONFIGURATION)

• HIGH/MEDIUM/LOW
Total fan indicator. This indicates if the total heat exchanger has been selected.
• A/C: air conditioning only.
• VENTI: ventilation only.
• A/C + VENTI: air conditioning and ventilation.
2| Operating mode indicator. Indicates the selected operating mode:
• FAN: fan.
• COOL: cooling.
• HEAT: heating.
• DRY: dehumidifying.
• AUTO: automatic (cooling/heating).
3| Run display. Red indicator.
4| RUN/STOP. Stop/start switch for the air conditioning system.
5| MODE. Operating mode switch.
6| FAN SPEED. Fan speed setting.
7| Panel operating switch.
8| VENTI: Selection of total ventilation operating mode.
9| LOUVER. Louver switch.
10| SELECTDAY/SCHEDULE. Day/programme selector. Increases or reduces the day/programme value setting for operation with timer.
11| TIMER button. Activates or deactivates the timer.
12| OK button.
13| RESET. Filter reset button.
Press after cleaning the filter. The FILTER indication disappears and the next cleaning period starts. Operation is also stopped.
14| TEMP buttons for setting the temperature.
15| T.RUN test run indicator. This lights up during a TEST RUN or CHECK.
16| ABNML display (alarm).
17| SET TEMP indicator (temperature setting).
18| 1234s indicator (programme number setting).
19| WEEKLY indicator Mon Tue … sun. Indicates that the central station or CSNET control is operating.
20| swing louver indicator. DEFROST indicator.
21| SERVICE indicator. Indicates change to special operations.
22| Time indicator
23| Time indicator. Indicates the programmed time.

2.2 PRElIMINARY INFORMATION
To open the cover, pull in the direction shown by the arrow.

NOTE

• If the fan speed is set to LOW and the outside temperature is higher than 21 °C, the compressor will be subject to excess load while operating in heating mode. Therefore, the fan should be set to HIGH or MEDIUM to avoid activation of the safety devices.
• When the system is restarted after being switched off for more than approximately 3 months, it should be checked by the service supplier.
• Switch off the mains switch when the system is inoperative for a long time. Otherwise, the system will consume electricity while the oil heater is active, even if the compressor is off.

2.3 PROCEDURE FOR OPERATION IN COOLING, HEATING, DEHUMIDIFYING AND VENTILATION MODE

Before operation:

• Switch on the power supply approximately 12 hours before starting the unit if it has been disconnected for a long time. Do not start the unit immediately after switching on the mains power supply as this could damage the compressor if it is not warm enough.
• Make sure that the outdoor unit is not covered in ice or snow. If it is, remove ice or snow with warm water (not hotter than 50 °C). If the water temperature is higher than 50 °C, the plastic parts may be damaged.

CAUTION

1. Switch on the power supply.
   Three vertical lines are displayed on the liquid crystal display, with the text A/C or VENTI.

2. Press MODE.
   Press MODE repeatedly to change the text, in the following order, from COOL, to HEAT, DRY until FAN (in models with cooling mode only; COOL, DRY and FAN). (The figure shows the selected mode COOL.

3. Press RUN/STOP.
   The text RUN (red) lights up. The system starts up automatically.
   NOTE
   Adjusting the temperature, fan speed and direction of the air louver: the setting is stored the first time and it is not necessary to reset the unit every day. When it is necessary to change the setting, please refer to chapter Procedure for adjusting the temperature, fan speed and direction of the air louver.

4. Disconnecting the system. (STOP).
   Press RUN/STOP again. The text RUN (red) appears. The system stops automatically.
   NOTE
   The fan may carry on working for approximately 2 minutes after the heating mode is stopped.

2.4 PROCEDURE FOR ADJUSTING THE TEMPERATURE, FAN SPEED AND DIRECTION OF THE AIR LOUVER

Do NOT touch the OK button.

• The OK button is only used for maintenance tasks.
• If the OK button is pressed accidentally and the operating mode switches to test mode, press the button again for approximately 3 seconds, wait 10 seconds and press it again.
• The operating mode switches to normal mode.

CAUTION

Temperature setting

• Set the temperature by pressing TEMP} or ~
• The temperature increases 1 °C each time } is pressed (max. 30 °C).
• The temperature decreases 1 °C each time ~ is pressed (min. 19 °C for COOL, DRY and FAN modes; min. 17 °C for HEAT mode). (The figure shows the temperature setting at 28 °C.)

Fan speed setting

• Press FAN SPEED.

• If FAN SPEED is pressed repeatedly, the display changes successively from HIGH to MEDIUM and LOW, in this order.

• For normal operation, select the fan speed HIGH.
  (The figure shows the speed set to MED.)
  NOTE
  In DRY mode, the fan speed automatically changes to LOW and cannot be changed (however, the display shows the actual setting).

• Adjusting the direction of the swing louver Press LOUVER: the louver starts to swing. Press the button again to set the position of the louver. Press repeatedly and the louver swings and stops successively.

• Fixed position The indication shows the direction of the air flow.

• Position of the automatic oscillation The indications change continuously according to the swing of the louver.

NOTE
In heating mode, the angle of the louver changes automatically.

2.5 PROCEDURE FOR VENTILATION MODE

This function is only available when the total heat exchanger is connected.

If the following procedures are carried out and the total heat exchanger is not connected, the NO FUNC TION indication flashes for 5 seconds.

CAUTION
Ventilation
Press VENTI. When VENTI is pressed repeatedly, the indication changes, in this order, from A/C to VENTI and A/C + VENTI.(The figure shows the A/C + VENTI setting). NOTE

• Please contact your HITACHI distributor or supplier for detailed information.
• If the mode changes to VENTI during the individual operation of the air conditioning system, this stops. If the mode changes to A/C during the individual operation of the total heat exchanger, this stops.

2.6 PROCEDURE FOR AUTOMATIC HEATING/VENTILATION MODE (COOL/HEAT)

The automatic heating/cooling mode should be configured using the optional function. Please contact your HITACHI distributor or supplier for detailed information. This function allows the operating mode (cool or heat) to be changed automatically, depending on the difference between the set temperature and the intake air temperature.
If the intake air temperature is 3ºC higher than the set temperature, the unit operation switches to COOL mode. If it is 3ºC lower than the set temperature, the unit operation changes to HEAT mode.

NOTE

•  If the heat mode has been set with the fan speed at LOW, the protective devices will stop the system frequently. In this case, set the fan speed to HIGH or MED.
• If the outside temperature is higher than approximately 21ºC, the heating mode is not available. The temperature difference between the cooling and heating mode is fairly significant when this function is used. Therefore, this function should not be used to supply air conditioning to a room when a precise temperature and humidity control is required.

2.7 PROCEDURE FOR ADJUSTING THE SWING LOUVER

Angle of louver which can be selected
Angle of louver that cannot be selected
Angle of louver recommended for heating
Angle of louver recommended for cooling

Swing louver adjustment.

1. When LOUVER is pressed, the swing louver begins to operate. The margin of the angle of swing is approximately 70º from the horizontal position to the vertical position. When the symbol moves, this indicates that the louver is operating in continuous mode.
2. When the swing movement of the louver is no longer required, press LOUVER again. The louver stops at the angle indicated by the direction of the symbol .
3. The air discharge angle is set at 20º for the RCI series and 40º for the RCD series during start-up in heating and defrost mode, when the thermostat is operating. When the outlet air temperature is more than approximately 30ºC , the swing louvers come on.

Setting the louver position

1. For the COOL and DRY modes, the air discharge angle can be set to 5 different positions. In heating mode, it can be set to 7 positions.
2. To set the position of the louver, press LOUVER to start the swinging movement, and then press again when the louver is in the required position.
3. The air discharge angle is set at 20° for the RCI series and 40° for the RCD series during start-up in heating and defrost mode, when the thermostat is operating. When the outlet air temperature is more than approximately 30 °C , the swing louvers come on. RCI and RCD: when the louver angle is set to 55° for RCI, 65° for RCD or 70° for both series during heating mode and the unit is switched to cooling mode, the louvers are automatically set at an angle of 45° for RCI or 60° for RCD.

NOTE
There is a difference between the true angle of the louver and the angle shown on the liquid crystal display. When LOUVER is pressed, the louver does not stop immediately. The louver moves with an additional swing. If the louvers are moved during cleaning or for any other reason, select the automatic adjustment to return the four louvers to the same position.

Do not turn the air louver manually. This could damage the mechanism (in all the units).| CAUTION
---|---
• Wall type (RPK):
Manually set the vertical louvers to direct the air discharge in the required direction.Do not
swing leaf 1 to the left or leaf 2 to the right of the vertical louver-1-.
• Automatic louver adjustment:
When the unit is not operating, two air louvers are automatically stopped in the closed position.| |
• Ceiling type (RPC): The vertical louver has four sets -A- of louvers. Manually set the vertical louvers -1- to direct the air discharge in the required direction.
NOTE
Models not fitted with swing louver do not display the above instructions on the remote control. In any case, the louver must be adjusted manually.| |

2.8 PROCEDURE FOR TIMER OPERATION

• setting the time and date

1 Press SELECT (▼) DAY for more than 3 seconds to change to the date setting mode.
The text SET appears and the day flashes. All the days are displayed, except the current day.|
---|---
2 Press SELECT (▼) DAY until the current day flashes and press OK.
The date is shown and the time flashes.|
3 Press SELECT (▲ ▼) DAY / SCHEDULE to select the hour and, then press again.
The hour is displayed and the minutes flash.|
4 Press SELECT (▲ ▼) DAY / SCHEDULE to select the minutes and, then press again.
The time setting mode is completed and the unit returns to normal mode. The minutes are displayed and
the text SET goes out. The seconds begin from zero.|

*  Timer setting (programming)

1 Press TIMER: The texts SET and SCHEDULE appear. Programme number “1” flashes and the othernumber are displayed.|
---|---
2 When SCHEDULE (▲) is pressed, the programme number changes:
[1] → [2] → [3] → [4] → [S] → [1]→….
• Select [S] to set the on/off time and the change of temperature.
• Press TIMER to switch off the texts SET and SCHEDULE and the unit returns to normal mode.|
3 Press OK and the selected programme number is displayed. The indicators for the other programme numbers switch off and the start-up time for the selected programme number flashes.|
4 Press SELECT (▲ ▼) DAY / SCHEDULE to select the hour and, then press again. The hour is displayed and the minutes flash.|
5 Press SELECT (▲ ▼) DAY / SCHEDULE to select the minutes and, then press again. The minutes are displayed and the off time flashes.|
6 Set the off time in the same way as the start-up time. After the minutes have been set, the off time is displayed. If the programme number [1][2][3][4] is activated, the display changes to the programme number shown in step 2. If [S] is selected, please see the section about setting the change in temperature for further details.|
7 By pressing (▲ ▼) DAY / SCHEDULE, the SET and SCHEDULE indicators switch off and the unitreturns to normal mode.|

• Definition of the programme to be applied

1 Press (▲ ▼) DAY / SCHEDULE for more than 3 seconds, the display SET is shown.
All the days and programme numbers are displayed.|
---|---
2 Press (▲ ▼) DAY / SCHEDULE until the day to be changed flashes. When pressed, the day flashes
[Mon] → [Tue] → … → [Sun] → [Mon~Sun] → [Mon~Fri] → [Sat, Sun] → [Mon] … If several days are
flashing, the same setting applies to all the days.
4 Press (▼) SCHEDULE to display the SCHEDULE indicator. Next, the programme number defined in
step 3 is applied to the days set in step 2. Press OK to activate or deactivate the programme. When
the programme is active, the SCHEDULE indication lights up.|
5 Press TIMER to return to normal mode.|

* Cancellation of timer

In normal mode, press (▲ ▼) DAY / SCHEDULE for more than 3 seconds. The NExT SCHEDULE indicator flashes. (Cancellation of all timers)|
---|---
While the timer is in cancellation mode, press (▲ ▼) DAY / SCHEDULE for more than 3 seconds. The
NExT SCHEDULE indication lights up. (Activation of the timer)|

*Temperature change setting (energy saving mode)

1 Switch on as described in steps 1 and 2 of the “Timer setting” section and select programme “S”.|
---|---
2 Switch on as described in steps 4, 5 and 6 of the “Timer setting” section and set the switching on or off time. The temperature setting is displayed.|
3 Select change of temperature by pressing (▲ ▼). “3” or “5” may be selected. If RESET is pressed now, the temperature change is not set and “- -“ is displayed. When TIMER is pressed, the temperature is displayed and the mode changes to
programme number selection.|
4 When TIMER is pressed, the SET and SCHEDULE indicators switch off and the unit returns to normal mode.|

NOTE

1. On completion of the procedure, the temperature display changes.
2. On completion of the procedure, the temperature setting of CSNET NET WEB or PSC-A64S has a normal range, while the remote control changes to a new range.
3. The increase or decrease of the temperature setting during the programmed time (±3 °C or ±5 °C) varies according to the operation mode.
   • When the system is operating in FAN, COOL or DRY modes, the temperature variation is +.
   • When the system is operating in HEAT mode, the temperature variation is-.

* Automatic operation with heating (protection against freezing)

1 In normal mode, press for more than 3 seconds to change the operating mode. The automatic heating mode is activated and the ON indicator is displayed to the right of the current time. The ON indicator flashes while the automatic heating mode is operating.|
---|---
Cancellation
While the system is operating in automatic heating mode, press MODE for more than 3 seconds to return to normal mode. The automatic heating mode is switched off and the ON indicator displayed to the right of the current time switches off.|

NOTE
If the room temperature is lower than the predefined setting (5, 10 or 15 ºC, selected using an optional setting), the heating starts automatically. When the room reaches the set temperature, the unit stops working.

* Operating lock method

To prevent the buttons from being used incorrectly(1), the button operation can be locked.

1 In normal mode, press SELECT (▲ ▼) for more than 3 seconds. The operating lock is activated and the OPER.LOCK indicator is displayed. If a button is pressed when the operating lock is on, the OPER.LOCK indicator flashes.|
---|---
Cancellation
While the lock function is on, hold down (▲ ▼) and SELECT at the same time for more than 3 seconds to return to normal mode. The operating lock is cancelled and the OPER.LOCK indicator switches off.|

NOTE
(1)The button to be locked can be selected in “change of operating mode”, “temperature setting”, “air flow” and “automatic louver” using an optional setting (F8-Fb) of up to 4 elements. The setting can be modified from CSNET or from the secondary remote control.

2.9 ON-SCREEN DISPLAYS DURING NORMAL OPERATION

• Thermal controller When the thermal controller is operating, the fan speed changes to LOW and the
display does not change. (In heating mode only).|
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• Defrost When the system is operating in defrost mode, the text DEFROST is displayed. The indoor
fan slows down or stops (depending on the selected setting).The louver is set in a horizontal position
at 35°. However, the text display on the screen remains lit. (The figure shows the setting DEFROST.)|
When the unit stops during defrost mode, the text RUN (red) goes out.
However, the system continues showing the text DEFROST and the unit starts up when the defrosting
is completed.|
• Filter Filter blocked: the text FILTER lights up when the filter is blocked with dust, etc. Cleaning the
filter: press RESET after cleaning the filter. The text FILTER goes out.|

2.10 ON-SCREEN DISPLAYS DURING ABNORMAL OPERATION

If RUN lamp flashes for 2 seconds, there is a failure in transmission between the indoor unit and the remote control switch. Possible causes are:

• The remote cable is broken.
• Contact failure in remote control cable.
• IC or microcomputer defective.
• Power shortage All displays disappear. If the unit stops due to a power shortage, it will not start again, even though the power comes back on. Carry out the start-up operations again.If the power shortage lasts less than 2 seconds, the unit will start again automatically.
• Electrical noise The displays can disappear from the screen and the unit can stop. This is because the microcomputer has been activated to protect the unit from electrical noise.
• In all cases, contact your service provider.
  If RUN lamp flashes 5 times (5 seconds) with unit number and alarm code displayed, note the alarm code (see table Alarm codes) and contact your service provider.

Model code

Model code

Indication (P)| Model
| Heat pump
| Inverter
| Multi (SET-FREE)
| Cooling only
| Other
| KPI

AUTOMATIC CONTROLS

3.1 AUTOMATIC CONTROLS

The system is equipped with the following functions:
Three-minute protection
The compressor remains at a standstill for a minimum of three minutes once stopped. If the system restarts approximately 3 minutes after stoppage, the RUN indicator is enabled. However, cooling or heating operating mode remains switched off and does not start until after three minutes.
Frost formation prevention during cooling mode
When the system is used in a room at a low temperature, cooling mode can be switched to fan mode for a moment to prevent frost from forming on the indoor heat exchanger.
low-speed air control during heating mode operations When the compressor is stopped while the thermostat is switched off or when the system is automatically defrosting, the fan is set to low speed or stops.
Automatic defrost cycle
When heating mode is stopped by pressing the RUN/STOP button, a check is made for frost on the outdoor unit and, where necessary, defrost is run for a maximum of 10 minutes.
Automatic restart after a power shortage
If the electricity supply is interrupted for short periods (of up to 2 seconds), the remote control will store the settings and the unit will restart when the electricity supply is re-established.
Contact your distributor where an automatic restart is required after an electricity shortage of more than 2 seconds (optional function).
Systems equipped with a heat pump will also be fitted with the following functions:
Operating overload prevention
When the outdoor temperature is too high during heating mode, this operating mode is stopped due to the outdoor thermistor being enabled until the temperature drops.
Hot start during heating mode
To prevent cold air discharge, the fan speed is controlled from the low-speed position to that defined in line with the discharge air temperature. The louver is set horizontally at the same time.
Compressor hot start
The FSXNH series requires electricity connection four hours prior to start-up (stoppage code d1-22). Where start-up is required within four hours: See on Carry out the Test Run.

PART NAMES

4.1 RAS-(5/6)FSXNH

4.2 RAS-(8-12)FSXNH

REFRIGERANT CYCLE

5.1 RAS-(5/6)FSXNH

5.2 RAS-(8-12)FSXNH

TRANSPORT, LIFTING AND HANDLING OF THE UNITS

6.1 TRANSPORT OF OUTDOOR UNIT

When transporting the unit, make sure that it is securely and correctly fastened to the vehicle to avoid damage. To avoid damage, use appropriate textile slings -A- and cardboard protection -B- to ensure that the unit is immobilised without damaging it.
Use a suitable crane with the required loading capacity on flat ground when loading and unloading the unit.

CAUTION
Do not place other material on top of the outdoor units during transport and storage.
If the unit is not installed immediately, it should be stored in a suitable location, protected from the elements, especially in saline atmospheres and from rodents. The unit must be stored with all the transport protection with which it was supplied and with the wooden base -C- fitted.

6.2 HANDHING
When handling loads with fork-lift trucks, special care should be taken to prevent injury to individuals in the vicinity or damage to the unit itself.

CAUTION
National and local legislation must be observed with respect to driving and the handling of loads with fork-lift trucks.
The only places in which the forks of the fork-lift truck can be inserted are through the openings -A- of the unit base.
Do not apply excessive force to these openings, with either the forks or other tools. This could damage the base of the unit.
Do not move the unit by pushing it on side -B- of the base with the forks of the fork-lift truck or by applying force on zone -C-.
Do not use wheelbarrows to move the unit.

6.3 LIFTING METHOD
Do not remove any of the protective packaging from the unit to protect it during handling and lifting.
The unit should only be lifted from the base.
Fit the hoisting slings -A- through the openings -B- on the base of the unit.

DANGER

• Always use textile slings in good condition, without cuts or wear, and with the correct capacity for lifting the outdoor unit.

• Do not fit the slings on the wooden base -C- of the unit.
  The wooden base is only designed to protect the base of the unit during transportation; it will not withstand the strain of lifting the unit.

• Do not use metal cables to lift the unit. Metal cables may slip on the wooden base supporting the unit and could cause the unit to tilt or fall during the lifting operation.

Slightly tighten the two hoisting slings.

Insert protection -E- between where the slings touch the upper protective cardboard packaging of the the unit. The slings must not touch the unit.
The slings should form an angle of more than 60° -D- with the upper part of the unit.
The unit should be kept horizontal throughout the lifting operation. If necessary, tie guide ropes on to prevent the unit from swinging freely during the lifting process. Do not apply force to zone -F-.

DANGER
No-one should remain in the radius of action of the crane during the lifting process.

6.4 CENTER OF GRAVITY

RAS-5FSxNH
RAS-6FSxNH| 1,720| 950| 765| 645| 465| 335
RAS-8FSxNH
RAS-10FSxNH
RAS-12FSxNH| 1,720| 1,210| 765| 660| 580| 350

UNIT INSTALLATION

7.1 PRELIMINARY CONDITIONSFOR POSITIONING OF OUTDOOR UNIT

Mount the outdoor unit in a shady location or where it will not be exposed to direct sunlight, or to high temperatures. It should also be a well-ventilated spot.
Mount the outdoor unit so that noises and the discharge of air from the unit will not bother neighbours or the surrounding environment.
Install the outdoor unit in an area of limited access to the general public.
In cold climates, ice may form on the unit. When installing the unit, make sure that ice falling off the unit could not pose a risk to passers-by.
When installing the outdoor unit in areas covered by snow, mount the covers supplied by the fitter on the top of the unit and on the heat exchanger inlet side.
Do not install the outdoor unit in zones where dust or contamination could block the outside heat exchanger.
Do not install the outdoor unit in areas with a high air content of oil, saline atmospheres or aggressive gases such as Sulphur.
Do not install the outdoor unit close to sources of strong electromagnetic radiation or in areas where electromagnetic waves radiate directly towards the electrical box and the components of the unit. Install the unit as far as possible from these sources (minimum 3 metres); electronic noise may result in the incorrect operation of the unit.
CAUTION
In areas with high electromagnetic turbulence, a fuse may blow or the unit stop or an alarm may be triggered. In this case, stop the system and restart it to remove the alarm.
Make sure that the base of the foundations is flat and strong enough to bear the weight of the unit.
Install the outdoor unit in an area with enough space around the unit to permit service and maintenance tasks.

****CAUTION

• The aluminium fins have sharp edges. Take special care to avoid injury.
• The outdoor unit must be installed on rooftops or in areas not accessible by the user. Only service technicians and maintenance personnel are permitted access to the unit.

7.2 INSTALLATION SPACE

NOTE
Side view. All measurements are in mm.

Calculate the service space required during the installation of the unit, based on the following:

• If there are no walls in front of or behind the unit, a space of 500 mm is necessary in front -A- and 300 mm behind -B-.
• If the front wall is higher than 1500 mm, a space of (500 + h2/2) mm is required at the front -A-.
• If the rear wall is higher than 500 mm, a space of (300 + h1/2) mm is required at the back -B-.
•  If a wall -D- is installed in front of the unit, a ventilation hole -C- should be made in the wall.
•  When the space over the unit is less than 1500 mm, or the space around the unit is closed, a duct is required to prevent short-circuits between the inlet air and the discharge air.
• If there are any obstacles in the space over the unit, the four sides of the unit should be left open.

7.3 INSTALLATION

7.3.1 Installation with walls in two directions
If the units installed are adjacent to high buildings, without walls in two directions, a space of 300 mm is required at the rear side of the unit.

NOTE

• All measurements are in mm.
• Top view. The arrow ▼ indicates the front of the unit.
• W: No limit for side wall height.

7.3.2 Installation with walls in three directions

NOTE

• All measurements are in mm.
• Top view. The arrow ▼ indicates the front of the unit.
• W: No limit for side wall height.

7.3.3 Installation with walls in four directions

NOTE

• All measurements are in mm.
• Top view. The arrow ▼ indicates the front of the unit.
• W: No limit for side wall height.

7.3.4 Considerations

• The dimensions considered in the figures include the space necessary for typical installation, and maintenance work for operation in refrigeration mode at an outdoor temperature of 35 °C.
  If the outdoor temperature is higher and if there is a possibility of a short circuit between the inlet and outlet air, locate the most suitable dimensions by calculating the air flow current in comparison with the dimensions given.

• For installation in several groups, a maximum of six units (A) one metre apart can be grouped.

• If the unit is surrounded by walls on all four sides, keep one of the walls partially open.

• Keep the upper side open to prevent mutual interference of inlet and outlet air for each outdoor unit.

7.4 FOUNDATION AND ANCHORAGE OF OUTDOOR UNIT

7.4.1 Foundations

NOTE
All measurements are in mm.

A. Mortar housing ø100×150
B. Drainage 100×20
C. Anti-vibration insulation material
D. Refrigerant pipes

The foundations for the installation of the outdoor unit must be more than 150 mm above ground level.
The foundations require perimeter drainage to help drain condensation.
When a system of condensation drainage pipes is required for the outdoor unit, the genuine accessory DBS-TP10A should be used. Do not fit drainage pipes or collection trays in cold climates, as they could freeze and break.

DANGER

Drainage must not take place in areas frequented by pedestrians. In low temperatures, the drainage water could freeze and lead to falls.
The foundations must be able to bear the weight of the whole of the base of the unit and should be laid as shown in the diagram.

Check the front-rear line and the sides of the unit are level: there should not be more than 10 mm difference between each side.
The foundation must be sufficiently strong to ensure that the outdoor unit:

• Is not tilted.
• Does not produce strange noises.
• Remains secure in the event of strong winds or earthquakes.

7.4.2 Position of anchorage bolts

NOTE
All measurements are in mm.

Secure the outdoor unit using the field-supplied anchorage bolts.

A. Openings for the anchorage bolts (4x) 38×15.

1. Outdoor unit SET FREE RAS-(5/6)FSXNH
2. Outdoor unit SET FREE RAS-(8-12)FSXNH

Diagram of fastening of outdoor unit using field-supplied anchorage bolts.

A. Nut
B. Washer
C. M12 anchorage bolt
D. Mortar fill
C. Concrete

PIPING WORK AND REFRIGERANT CHARGE

8.1 REFRIGERANT PIPE SElECTION

8.1.1 Refrigerant pipe selection

The RAS-(5-36)FSXNH(-P) outdoor units can work as a heat pump system, by means of a two-pipe system (gas pipe and liquid pipe), or they can work as a heat recovery system by means of a three-pipe system (high and low pressure pipes and liquid pipe), requiring in addition the CH units supplied as accessories. There is an optional specific pipe connection kit available according to the power of the outdoor unit:

Operating mode| Outdoor unit| Nº
of kits| Connection kit| Indications
---|---|---|---|---
Heat
pump
system| RAS-(12-P)
(14-24)FSxNH| 2| MC-20AN1| 2 pipes type for high/low pressure gas
• for liquid
RAS-(24-P)
(26-36)FSxNH| 3| MC-30AN1
Heat
recoverysystem| RAS-(12-P)
(14-24)FSxNH| 2| MC-20xN1| 3 pipes type for high/low pressure gas
• for low pressure gas
• for liquid
RAS-(24-P)
(26-36)FSxNH| 3| MC-30xN1

*  Pipe size selection

Select the pipe size in line with the following instructions:

1. Between the outdoor unit and the branch pipe (multikit): select the same pipe connection size as for the outdoor unit.
2. Between the branch pipe (multikit) and the indoor unit: select the same pipe connection size as for the indoor unit.

CAUTION

• Do not use refrigerant pipe sizes other than those indicated in this manual. The diameter of the refrigerant pipes depends directly on the power of the outdoor unit.

• If larger diameter refrigerant pipes are used, the circuit lubrication oil tends to separate from the gas carrying it. The compressor will be seriously damaged due to a lack of lubrication.

• If smaller diameter refrigerant pipes are used, the gas or liquid refrigerant will have serious difficulties in circulating. System performance will be affected. The compressor will run under more severe conditions than foreseen and will be  damaged in a short space of time.

• Multi kit or distributor selection

NOTE

• Pipe connection sizes on outdoor units, indoor units and the multikit or distributor vary depending on the system. Consult the Service Manual for the SET FREE Series FSXNH.
• The sizes of the indoor and outdoor units are different. Adjust the flare adapter (accessory) to the indoor pipe connection.

8.1.2 Copper pipes, sizes, connection and insulation
* Copper pipes and sizes

CAUTION

• The copper pipe used in the refrigeration installations is different to the copper pipe used in installations carrying domestic or heating water.
• The copper pipe for refrigeration installations is especially treated for outdoors and indoors. The interior surface finish makes it easier for the refrigerant to circulate and withstands the action of the lubricant oil applied to outdoor equipment.

Prepare the copper pipes provided by the supplier.
Select the pipe with the appropriate diameter and thickness. Use the table below to select the most appropriate pipe:

Nominal diameter| Thickness mm| Supply| Nominal diameter| Thickness mm| Supply
---|---|---|---|---|---
mm| Inches| mm| Inches
6.35| 4-Jan| 0.8| Roll| 25.4| 1| 1| Pipe
9.52| 8-Mar| 0.8| Roll| 28.58| 1/1/2008| 1| Pipe
12.7| 2-Jan| 0.8| Roll| 31.75| 1/1/2004| 1.1| Pipe
15.88| 8-May| 1| Roll| 38.1| 1/1/2002| 1| Pipe
19.05| 4-Mar| 1| Pipe| 41.3| 1/5/2008| 1| Pipe
22.2| 8-Jul| 1| Pipe| 44.45| 1/3/2004| 2| Pipe

Always use clean copper pipes with no signs of knocks or cracks.
Make sure there is no dust or dampness on the inside. Before you install the pipes, clean the inside with oxygen-free nitrogen gas to eliminate any remains of dust or other substances.

CAUTION

• Do not use hand saws, circular saws, abrasive grinders or other tools that generate shavings.
• Strictly follow national or local regulations regarding occupational health and safety.
• Wear appropriate means of protection during cutting or brazing operations and installation (gloves, eye protection, etc).

On completing the installation of the refrigerant pipes -B-, insulate them appropriately using suitable insulating material -A- and seal the open space between the holes made and the pipe, as shown in the figure.

* Pipe connection

Cover the end of the pipe appropriately when it is to be inserted through holes in walls and roofs, etc.
Keep the ends of the pipes covered while other installation work is being carried out to avoid the entry of dampness or dirt.
Do not place the pipes directly on the ground without appropriate protection or adhesive vinyl tape to cover the ends.
Where the pipe installation is not completed for a certain amount of time, braze the ends of the pipe to seal. Then fill it with oxygen free nitrogen gas through a Schrader valve to avoid the accumulation of humidity and/or contamination
through dirt.

NOTE

• Where polyethylene foam insulation is used, a 10 mm thick layer should be used for the liquid pipe and between 15 and 20 mm for the gas pipe.
• Install the insulation after the pipe surface temperature has dropped to the same temperature as that of the room, otherwise the insulation may melt.

Do not use insulating material that contains NH3 (ammonium), as it could damage the copper in the pipe and subsequently cause leaks.
Where the fitter has supplied his own branches, these should be appropriately insulated to avoid decreases in capacity in line with to environmental conditions and dew on the surface of the piping due to low pressure.

* Dimensions of flared pipe

Perform the widening operations in accordance with the measurements shown below.
(1)Not possible to perform the widening using pipe. In this case, use a connection with flare fitting.
*  selection of the connection with flare fitting
It is not possible to perform the widening operation, if copper is used in pipes. In this case, use a connection with flare fitting.

Minimum thickness of the connection

Minimum thickness of the connection

Diameters (mm)| R410A
06.35| 0.5
ø9.52| 0.6
ø12.7| 0.7
ø15.88| 0.8
ø19.05| 0.8
ø22.2| 0.9
ø25.4| 0.95
ø28.58| 1.0
ø31.75| 1.1
ø38.1| 1.35
ø43.3| 1.45
ø44.5| 2.55

Distance between sides -B- of the nut -A-

Diameters
(mm)| -B-
ø6.35| 17
ø9.52| 22
ø12.7| 26
ø15.88| 29
ø19.05| 36

* Connection position of outdoor unit pipes

A. Front
B. Rear
C. Lower side
D. Base
E. Liquid pipe
F. Gas pipe (high pressure)
G. Gas pipe (low pressure) (only for heat recovery systems, with CH units)
H. Cover of refrigerant gas and liquid pipes
I. Cover insulation

Fit and secure refrigerant pipes correctly to prevent vibrations and strain on the stop valves.
The pipes may be fitted in three directions (front, rear or inferior) from the base of the unit.
Remove the cover of the gas and liquid pipes -H- and connect using the accessories factory-supplied with the unit:
see on chapter Accessories factory-supplied with the unit.
Fit the cover on the pipes and completely seal around them and the cover to prevent the entrance of water, rodents and dirt.

Accessories factory-supplied with the unit

NOTE
Please contact your HITACHI distributor if any of the accessories has not been supplied with the unit.

8.1.3 Pipe connection kit
* SET FREE FSXNh (2 pipes)

MC-30AN1
KIT 1| |
MC-30AN1KIT 2| | A To indoor unit
B To outdoor unit 1
C To outdoor unit 2
D To outdoor unit 3
E To piping connection kit 1
F To piping connection kit 2

• SET FREE FSXNH (3 pipes)

20xN12](https://manuals.plus/wp-content/uploads/2024/08/HITACHI-RAS-FSXNH-Air- Conditioning-MC-20xN12.png)| |
MC -3 0 xN 1
KIT  1| | |
MC -30xN 1
KIT  2| | |

Unit: mm, ID: Inner diameter, OD: Outer diameter

A. To indoor unit
B. To outdoor unit 1
C. To outdoor unit 2
D. To outdoor unit 3
E. To piping connection kit 1
F. To piping connection kit 2

8.1.4 Precautions for the installation of the outdoor unit

* Order of installation of the units

The outdoor units must be installed in decreasing order of capacity:
Capacity of unit A ≥ capacity of unit B ≥ capacity of unit C.
Unit -A-, with the highest capacity, must be closest the indoor units.

* Refrigerant pipe installation between outdoor units

The length between the connection kit -K- (on the side of the outdoor unit) and the outside unit, must be L A ≤ L B ≤ L ≤ 10 m.
Place the connection kit at a lower level with respect to the connection of the refrigerant pipes of the outdoor unit.
If the connection kit is placed above the refrigerant pipe connection of the outdoor unit, keep a maximum of 300 mm between the connection kit and the base of the outdoor unit. In addition, an oil recovery unit -A- (minimum 200 mm)
should be fitted between the connection kit and the outdoor unit.

If the length of the refrigerant gas and liquid pipes between outdoor units is greater than two metres, the oil recovery unit should be fitted on the gas pipe to prevent the build-up of refrigerant oil.

Place the refrigerant pipes of the outdoor units horizontally, or slightly tilted towards the side of the indoor units to prevent the build- up of refrigerant oil at the lowest point -A-.

If the refrigerant pipes are opposite the outdoor unit, there should be a minimum of 500 mm between the outdoor units and the connection kits -B- for maintenance operations.

NOTE
The 500 mm space is required when replacing the unit compressor.

Install the connection kits parallel to the floor (± 15°).

8.1.5 general instructions on the installation of refrigerant pipes

The copper pipe used for the installation must be specific for refrigeration systems: see on Copper pipes and sizes.
The diameter of the refrigerant pipes depends directly on the power of the outdoor unit. The pipe diameter allocated must be respected, in line with the instructions given in chapter Pipe size selection.
The units must be located and the gas pipes laid, particularly when the outdoor unit is at a different height to the indoor unit, in line with the instructions given in chapter Precautions for the installation of the outdoor unit.
System performance depends on the distance between the outdoor and indoor unit. This aspect must be taken into account for the installation of the refrigerant pipe. The outdoor units are factory-charged with sufficient refrigerant for a standard installation of certain characteristics. Where the system installation requirements involve an increase in the distance between the outdoor and indoor unit, refrigerant must be added to the installation in line with the instructions given in chapter Refrigerant charge.

*  Flared connection mounting

Apply a thin layer of oil to the cone opening for refrigeration systems.
Line up the end of the flared pipe to face the fitting to which it is to be threaded.
Gently rest the female cone on the male cone and check that the measurement is correct. Keep the connection lined up with one hand and gently thread on the flare nut with the other.
Tighten the connection to the corresponding tightening torque indicated in the table below.

CAUTION

• Secure the fixed connection with a suitable wrench and use a torque wrench to tighten the flare nut on the threaded connections.
• Do not exceed the torque value indicated in the table. The fitting can become misshapen and the connection may leak.

* Refrigerant pipe insulation

The refrigerant circulates through the pipes at a very low temperature (several degrees below zero, depending on the time of year and the installation). The difference in temperature with the ambient air is extremely large and causes two  ignificant phenomena to be taken into account:

• Cold irradiation along the entire pipe.
• Condensation of the humidity in the surrounding air. Actually, cold irradiation is the temperature gain experienced by the gas, as when it circulates under pressure and at such low temperatures along the inside of the pipes, it is actually liquid and obtains the outdoor temperature (boiling at a very low temperature) to turn into gas.

As a result of the temperature gain (although it is actually perceived as cold emission), it loses its capacity to cool and the system does not perform as expected. Furthermore, the humidity in the surrounding air condenses on the pipe and the greater the temperature difference and the longer the pipe, the more water is produced.
In view of this, the refrigerant pipes must be fitted with a suitable insulation system that prevents the increase in temperature of the refrigerant and the subsequent loss of energy and the condensation of water along the entire pipe. Refrigerant pipes must always be separately insulated, using closed cell insulation foam designed especially for refrigeration. This insulation foam, supplied by the installer, can be obtained in different formats. The most common is in the form of sheets and rolls of tubes of different diameters.
Furthermore, all connections between the different sections of insulation tubes must be reinforced with adhesive tape of the same characteristics.
Once all of the unit installation and adjustment work is complete, all threaded joints and valves must also be covered with adhesive tape.

*  Refrigerant pipe suspension

Only suspend the refrigerant pipes at specific points of the building.
Whenever possible, avoid suspending them from parts subject  to structural movement, e.g. places close to expansion  joints or outer walls, etc.
Prevent the refrigerant pipes from touching weak parts of the building, such as walls (non-structural), partition walls, ceilings, etc. Otherwise, operating noise may be caused by pipe vibrations (pay special attention in the case of short pipes).
A: points where the refrigerant pipes pass through the different structural parts of the building.
B: indoor unit.

Use suitable suspension systems for refrigeration pipes or clamps to suspend the pipes, as shown in the diagram.

8.1.6 Refrigerant pipe connection for heat pump systems (2 pipes)

Perform the piping connection work for each outdoor unit. Prepare the refrigerant pipe in the field for the piping work.

(All measurements are in mm)

Piping direction

Fix the pipes adequately in order to avoid vibration and excessive force to the valve.

1. The pipes can be installed in three directions (front, rear or bottom side) from the bottom base. For vibration protection ,properly fix the piping connection and check that no excessive force is applied to the stop valve.
2. Operation of the stop valve should be performed according the specified in this mannual.
3. Connect the pipes according to the tables.
4. Completely seal the penetration part at the bottom of the pipes with insulation in order to prevent rain water from entering the conduit.

* Pipe sizes for RAs-(5-12)FSXNh (base unit

NOTE
Ensure that the refrigerant pipe should be connected to the same refrigerant cycle unit.

Model| RAs-5FsXNh| RAs-6FsXNh| RAs-8FsXNh| RAs- 10FsXNh| RAs-12FsXNh
---|---|---|---|---|---
Piping size(ø mm)| a| High/Low
pressure gas| 15.88
(15.88-19.05)| 19.05
(19.05 – 22.2)| 19.05
(19.05 – 22.2)| 22.2
(22.2 – 25.4)| 25.4
(25.4 – 28.58)
Liquid| 9.52
(9.52 – 12.7)| 9.52
(9.52 – 12.7)| 9.52
(9.52 – 12.7)| 9.52
(9.52 – 12.7)| 12.7
(12.7 – 15.88)

• If the specified main refrigerant piping on the table is not available on site, follow the allowable piping size in parentheses. When using the main refrigerant piping indicated in parentheses, prepare an appropriate reducer on site.

* Pipe sizes for RAs-(14-24)FSXNh (Combination of two units)

A: main outdoor unit
B: secondary outdoor unit
C: connection kit
1: indoor units on left side
2: indoor units on right side

• Install the outdoor units and connect the refrigerant pipes as shown in the diagram. Please refer to the table to determine the appropriate connection kit and the diameter of the pipes for each unit.

Combination of base units

• Perform the installation of the outdoor unit and piping connection according to the figure. Refer to the table for the outdoor unit model, the piping connection kit model and the piping diameter.
• If the specified main refrigerant piping on the table is not available on site, follow the allowable piping size in parentheses. When using the main refrigerant piping indicated in parentheses, prepare an appropriate reducer on site.

*  Pipe sizes for RAs-(26-36)FSXNh (Combination of 3 units)

A: main outdoor unit
B: secondary outdoor unit
C: secondary outdoor unit
C1: connection kit 1
C2: connection kit 2
1: indoor units on left side
2: indoor units on right side

Install the outdoor units and connect the refrigerant pipes as shown in the diagram. Please refer to the table to determine the appropriate connection kit and the diameter of the pipes for each unit.

Combination of base units

• Perform the installation of the outdoor unit and piping connection according to the figure. Refer to the table for the outdoor unit model, the piping connection kit model and the piping diameter.
• If the specified main refrigerant piping on the table is not available on site, follow the allowable piping size in parentheses.
• When using the main refrigerant piping indicated in parentheses, prepare an appropriate reducer on site.

* stop valve

Follow the restrictions for refrigerant piping (permissible length, height difference) according to the item Piping Connection. If not, the outdoor unit may be damaged or fail.
The stop valves shall be closed completely (factory setting) when the refrigerant piping connection is performed. Do not open the stop valves until all the refrigerant piping connections, air-tight test and vacuuming have been completed.

Gas valve

1. Make sure that all the spindles are closed completely.
2. Connect the charging hose to the service port and release the gas inside the piping from the high/low and low pressure gas pipes.
3. Cut the end of the closing pipes and check that no gas exists inside the high/low and low pressure gas pipes.
4. Remove the stop valve cover.
5. Remove the closing pipe from the brazing portion with a burner. Pay attention to the flame from the burner not to burn the stop valve body.

CAUTION

• Ensure that there is no gas inside the pipe when removing the closing pipe. Otherwise, the pipe may be blown out and it may lead to injury.
• Protect the return oil pipe and vibration proof of the compressor with a metal plate when using a burner.

Liquid valve
Tighten the flare nut for liquid stop valve according to the following torque. If an excessive force is applied to the flare nut, the refrigerant leakage may occur from the spindle part.
(Put two spanners as shown in the right figure when the piping is removed and attached. If not, the refrigerant leakage may occur.)

CAUTION

• Do not apply an excessive force to the spindle valve after fully opening the spindle. The back seat construction is not provided.
• At the test run, fully open the spindle. If it is not fully opened, the devices will be damaged.

The details of stop valves is as follows:

Gas valve

Liquid valve

*  Refrigerant pipe connection

A. Stop valve (Low pressure gas)
B. Stop valve (High/low pressure gas)
C. Stop valve (Liquid)
D. Flaring
E. Liquid pipe (field-supplied)
F. Accessory pipe (B)
G. 90º Elbow B (field-supplied)
H. 90º Elbow A (field-supplied)
I. High/low pressure gas pipe (field-supplied)
J. Accessory pipe (C)

DANGER

• Check that the gas and liquid stop valves are fully closed.
• Check that there is no gas inside the pipe before removing the stop pipe. Otherwise, the pipe may explode when heated with the blow torch.

Special care should be taken to ensure that the flame from the blow torch does not fall on the body of the stop valve, on the compressor and cover or on the insulation bushings; insert a metal plate in front of the oil return pipe: see on chapter Gas stop valve.
Connect the indoor units to the outdoor units using copper pipes specifically for use with refrigerant. When laying the pipes make sure that they do not directly rest on or touch walls or other parts of the building (when the refrigerant is flowing through the pipes, this could cause strange noises).
Specific torques for the flared connections: see on chapter Flared connection mounting.
While welding, apply a flow of nitrogen gas inside the pipe. Fully insulate the refrigerant pipes.

CAUTION
Fit the pipe protection provided with the outdoor unit on completion of the installation work. Otherwise, the unit may be damaged by the entrance of snow, water or rodents
NOTE
Refer to the “Factory-Supplied Accessories” for the details of the accessory pipes (B) and (C).
Ensure that the closing pipes of the high/low and low pressure gas stop valves (2 parts) are removed firstly.

*  Example of installation (2 pipes)

A. Gas pipe (field-supplied).
B. Liquid pipe (field-supplied).
C1. Gas connection kit 1.
C2. Gas connection kit 2.
D1. Liquid connection kit 1.
D2. Liquid connection kit 2.
E. Accessory for connection of pipes (L-shaped).
F. Outdoor unit 1.
G. Outdoor unit 2.
H. Outdoor unit 3.
I. Accessory for connection of pipes (Z-shaped).

* size of pipes (ø mm) (2 pipes)

A: main outdoor unit
B, C: secondary outdoor units
D: connection kit 1
E: connection kit 2
F: indoor units
G: upstream side

Size of pipes

1. Pipe diameter for the outdoor unit.
2. Diameter of the main pipe (from the base unit or connection kit 1 to the first branch)(2).
   Outdoor unit (hP)| Equivalent pipe length < 100 m| Outdoor unit (hP)| Equivalent pipe length < 100 m
   ---|---|---|---
   gas| liquid| gas| liquid
   5| ø15.88| ø9.52| 16| ø28.58| ø12.70
   (6/8)| ø19.05| ø9.52| (18-24)| ø28.58| ø15.88
   10| ø22.20| ø9.52| (26-34)(24-P)| ø31.75| ø19.05
   (12/14)(12-P)| ø25.40| ø12.7| 36| ø38.1| ø19.05
3. Pipe diameter after first branch(3).
   Total indoor unit capacity
   after the first branch (hP)| gas| liquid| Total indoor unit capacity
   after the first branch (hP)| gas| liquid
   ---|---|---|---|---|---
   < 6| ø15.88| ø9.52| (16-17.99)| ø28.58| ø12.7
   (6-8.99)| ø19.05| ø9.52| (18-25.99)| ø28.58| ø15.88
   (9-11.99)| ø22.2| ø9.52| (26-35.99)| ø31.75| ø19.05
   (12-15.99)| ø25.4| ø12.7| > 36| ø38.1| ø19.05
4. Pipe diameter between multikit and indoor unit(4).
   Indoor unit (hP)| gas| liquid| Indoor unit (hP| gas| liquid
   ---|---|---|---|---|---
   (0.8-1.5)| ø12.7| ø6.35 (5)| 8| ø19.05| ø9.52
   2| ø15.88| ø6.35(5)| 10| ø22.2| ø9.52
   (2.5-6.0)| ø15.88| ø9.52| –| –| –

Pipe working conditions

NOTE

• (1) The connection kit is taken into account from the side of the indoor unit (as connection kit 1).

• (2)When the maximum equivalent refrigerant pipe length (L1) from the outdoor unit/connection kit 1 to the indoor unit is greater than 100 m, the diameter of the gas/liquid pipe from the outdoor unit/connection kit 1 to the first branch must be increased using the reducer (field-supplied).

• (3)Where the refrigerant pipe length is greater than 100 m, the pipe diameter does not have to be increased after the first branch. Where the size of the multicity is greater than that of the first branch, adjust the size of the multicity to the first branch. Where the diameter of the pipe selected after the first branch is greater than the diameter of the pipe after it, use the same diameter as the inlet pipe.

• (4)The pipe diameter -4- must be the same as that of the indoor unit connection.

• (5)Where the liquid pipe length is greater than 15 m, use 9.53 mm diameter pipe and a reducer (field-supplied).

• (6)Keep a direct distance of 500 mm or greater after the connection kit.

• (7)The installation conditions for the refrigerant pipes are different depending on the number of  indoorunits connected.

• (8) The total pipe length permitted must be less than 1000 m due to the maximum additional refrigerant charge limitation.
  HP| 5 – 10| 12| 14 and 16| 18 – 24| 18 – 24
  ---|---|---|---|---|---
  Maximum additional refrigerant charge (kg)| 28| 36| 40| 51| 63

• (9) Longer piping (up to 90m) is available only for Base Unit (FSXNH: 5-12HP) (sales on order).

NOTE

• Check that the gas pipe and the liquid pipe are equivalent in terms of length and installation system.
• Use the multicity system for branching of the indoor units and the CH unit.
• Install the indoor unit and the multi kit according to the instructions given in this manual.
• Where the length of pipe L3 between each multi kit and each indoor unit is considerably longer than on another indoor unit, the refrigerant will not flow correctly and performance is lower in comparison with other models (recommended pipe length: up to 15 m).

Pipe branching restrictions

Heat Pump System (2 pipes)
In the case that the piping length L2 from the Multi-Kit at the first branch to the farthest indoor unit is over 40m, follow the instructions below when performing the field-supplied piping work.

Example 1

Piping length from the multi kit at the first branch to the terminal Indoor Units is within 40-90 m

1. In the case that the piping length L2 is over 40m, thet size of gas and liquid lines “b and c” or “g and h” should be increased by one size with reducers (field-supplied).
   • If (a) is smaller than (b, c) after increasing the size, increase the size of (a) to the same size as (b, c).

2. The difference between the piping length from the first branch to the farthest indoor unit and the piping length from the first branch to the closest indoor unit must be within 40m.
   *(g+h+j)-(b+d) < 40m
   Header branch can be used with line branch at the 3 pipes portion and 2 pipes portion. Header branch can also be used after the second branch. Do not connect a line branch to a header branch. When using header branch, make sure that the piping length L2 from the Multi-Kit at the first branch to the farthest indoor unit is within 40m.

8.1.7 Refrigerant pipe connection for heat recovery systems (3 pipes)
Perform the piping connection work for each outdoor unit. Prepare the refrigerant pipe in the field for the piping work.

Piping direction
Fix the pipes adequately in order to avoid vibration and excessive force to the valve.

1. The pipes can be installed in three directions (front, rear or bottom side) from the bottom base. For vibration protection, properly fix the piping connection and check that no excessive force is applied to the stop valve. *  Pipe sizes for RAs-(5-12)FsXNh (Base unit)
2. Operation of the stop valve should be performed according to specified in this manual.
3. Connect the pipes according to the tables.
4. Completely seal the penetration part at the bottom of the pipes with insulation in order to prevent rain water from entering the conduit.

*  Pipe sizes for RAs-(5-12)FsXNh (Base unit)

1. Model| RAS-5FSXNH| RAS-6FSXN H| RAS-8FSXNH| RAS-1 OFSXN H| RAS-12FSXNH I
   ---|---|---|---|---|---
   a| Gas (low pressure)| 15.88
   (15.88 – 19.05)| 19.05
   (19.05 – 22.2)| 19.05
   (19.05 – 22.2)| 22.2
   (22.2 – 25.4)| 25.4
   (25.4 – 28.58)
   Gas (high/low pressure)| 12.7
   (12.7 – 15.88)| 15.88
   (15.88 – 19.05)| 15.88
   (15.88 – 19.05)| 19.05
   (19.05 – 22.2)| 22.2
   (22.2 – 25.4)
   Liquid| 9.52
   (9.52 – 12.7)| 9.52
   (9.52 – 12.7)| 9.52
   (9.52 – 12.7)| 9.52
   (9.52 – 12.7)| 12.7
   (12.7 – 15.88)

• If the main refrigerant pipe specified in the table is not available at the installation location, select the size given in brackets. In this case, prepare a suitable reducer.

* Pipe sizes for RAs-(14-24)FSXNH(Combination of two units)

A: main outdoor unit
B: secondary outdoor unit
C: connection kit
1: indoor units on left side
2: indoor units on right side

• Install the outdoor units and connect the refrigerant pipes as shown in the diagram. Please refer to the table to determine the appropriate connection kit and the diameter of the  pipes for  each unit.

Combination of base units

• Perform the installation of the outdoor unit and piping connection according to the figure. Refer to the table for the outdoor unit model, the piping connection kit model and the piping diameter.
• If the specified main refrigerant piping on the table is not available on site, follow the allowable piping size in parentheses. When using the main refrigerant piping indicated in parentheses, prepare an appropriate reducer on site.

* Pipe sizes for RAs-(26-36)FSXNH (Combination of 3 units)

A: main outdoor unit
B: secondary outdoor unit
C: secondary outdoor unit
C1: connection kit 1
C2: connection kit 2
1: indoor units on left side
2: indoor units on right side
Install the outdoor units and connect the refrigerant pipes as shown in the diagram. Please refer to the table to determine the appropriate connection kit and the diameter  of the pipes for each unit.

Combination of base units

• Perform the installation of the outdoor unit and piping connection according to the figure. Refer to the table for the outdoor unit model, the piping connection kit model and the piping diameter.
• If the main refrigerant pipe specified in the table is not available at the installation location, select the size given in brackets. In this case, prepare a suitable reducer.

* stop valve
Follow the restrictions for refrigerant piping (permissible length, height difference) according to the item Piping Connection. If not, the outdoor unit may be damaged or fail.
The stop valves shall be closed completely (factory setting) when the refrigerant piping connection is performed. Do not open the stop valves until all the refrigerant piping connections, air-tight test and vacuuming have been completed.

Gas valve

1. Make sure that all the spindles are closed completely.
2. Connect the charging hose to the service port and release the gas inside the piping from the high/low and low pressure gas pipes.
3. Cut the end of the closing pipes and check that no gas exists inside the high/low and low pressure gas pipes.
4. Remove the stop valve cover.
5. Remove the closing pipe from the brazing portion with a burner. Pay attention to the flame from the burner not to burn the stop valve body.

CAUTION

• Ensure that there is no gas inside the pipe when removing the closing pipe. Otherwise, the pipe may be blown out and it may lead to injury.
• Protect the return oil pipe and vibration proof of the compressor with a metal plate when using a burner.

Liquid valve
Tighten the flare nut for liquid stop valve according to the following torque. If an excessive force is applied to the flare nut, the refrigerant leakage may occur from the spindle part.
(Put two spanners as shown in the right figure when the piping is removed and attached. If not, the refrigerant leakage may occur.)

CAUTION

• Do not apply an excessive force to the spindle valve after fully opening the spindle. The back seat construction is not provided.
• At the test run, fully open the spindle. If it is not fully opened, the devices will be damaged.
  The details of stop valves is as follows:

Gas valve

Liquid valve

* Refrigerant pipe connection

A. Stop valve (Low pressure gas).
B. Stop valve (High/low pressure gas)
C. Stop valve (Liquid)
D. Flaring
E. Liquid pipe (field-supplied)
F. Accessory pipe (B)
G. 90º Elbow B (field-supplied)
H. 90º Elbow A (field-supplied)
I. High/low pressure gas pipe (field-supplied)
J. Accessory pipe (C)
K. Accessory pipe (A)
L. Low pressure gas pipe (Field supplied)

DANGER

• Check that the gas and liquid stop valves are fully closed.
• Check that there is no gas inside the pipe before removing the stop pipe. Otherwise, the pipe may explode when heated with the blow torch.

Special care should be taken to ensure that the flame from the blow torch does not fall on the body of the stop valve, on the compressor and cover or on the insulation bushings; insert a metal plate in front of the oil return pipe: see on Gas  stop valve.
Connect the indoor units to the outdoor units using copper pipes specifically for use with refrigerant. When laying the pipes make sure that they do not directly rest on or touch walls or other parts of the building (when the refrigerant is flowing through the pipes, this could cause strange noises).
Specific torques for the flared connections: see on Flared connection mounting.
While welding, apply a flow of nitrogen gas inside the pipe.
Fully insulate the refrigerant pipes.

CAUTION

Fit the pipe protection provided with the outdoor unit on completion of the installation work. Otherwise, the unit may be damaged by the entrance of snow, water or rodents.

NOTE

• Refer to the Factory-Supplied Accessories for the details of the accessory pipes (A), (B) and (C).
• Ensure that the closing pipes of the high/low and low pressure gas stop valves (1 parts) are removed firstly.

* Example of installation (3 pipes)

A. Gas pipe, low pressure (field-supplied)
B. Gas pipe, high pressure (field-supplied)
C. Liquid pipe (field-supplied)
D1. Gas connection kit, low pressure 1
D2. Gas connection kit, low pressure 2
E1. Gas connection kit, high pressure 1
E2. Gas connection kit, high pressure 2
F1. Liquid connection kit 1
F2. Liquid connection kit 2
G. Accessory for connection of pipes (L-shaped)
H. Outdoor unit 3
I. Outdoor unit 2
J. Outdoor unit 1
K. Accessory for connection of pipes (Z-shaped)
N. Accessory for connection of pipes

* size of pipes (ø mm) (3 pipes)

Size of pipes (ø mm)

1. Pipe diameter for the outdoor unit.
2. Diameter of the main pipe (from the base unit or connection kit 1 to the first branch) (3 pipes)(2).
   Outdoor unit
   (hP)| gas, low
   pressure| gas, high/low
   pressure| liquid| Outdoor unit
   (hP)| gas, low
   pressure| gas, high/low-pressure| liquid
   ---|---|---|---|---|---|---|---
   5| ø15.88| ø12.7| ø9.52| (18/20)| ø28.58| ø22.2| ø15.88
   (6/8)| ø19.05| ø15.88| ø9.52| (22/24)| ø28.58| ø25.4| ø15.88
   10| ø22.2| ø19.05| ø9.52| (26)(24-P)| ø31.75| ø25.4| ø19.05
   (12/14)(12-P)| ø25.4| ø22.2| ø12.7| (28 – 34)| ø31.75| ø28.58| ø19.05
   16| ø28.58| ø22.2| ø12.7| 36| ø38.1| ø28.58| ø19.05
3. Pipe diameter after first branch (3 pipes)(3).
   Total hP indoor
   unit| gas, low
   pressure| gas, high/low
   pressure| liquid| Total hP
   indoor unit| gas, low pressure| gas, high/low-pressure| liquid
   ---|---|---|---|---|---|---|---
   < 6| ø15.88| ø12.7| ø9.52| (18-21.99)| ø28.58| ø22.2| ø15.88
   (6-8.99)| ø19.05| ø15.88| ø9.52| (22-25.99)| ø28.58| ø25.4| ø15.88
   (9-11.99)| ø22.2| ø19.05| ø9.52| (26-35.99)| ø31.75| ø28.58| ø19.05
   (12-15.99)| ø25.4| ø22.2| ø12.7| > 36| ø38.1| ø31.75| ø19.05
   (16-17.99)| ø28.58| ø22.2| ø12.7| —| —| —| —
4. Pipe diameter between the CH unit and the multi kit (3 pipes and 2 pipes)(9).
   CH unit| Maximum combination of
   indoor units (8)| Available combination of indoor
   units capacity (h)| 3 pipes
   ---|---|---|---
   gas, low pressure| gas, high/low pressure| liquid
   CH-6.0N1| 7| 0.8 – 4.0| 015.88| 012.7| 09.52
   4.1 – 6.0| 019.05| 015.88| o9.52
   CH-10.0N1| 8| 6.1 – 8.0| 019.05| 015.88| o9.52
   8.1 – 10.0| 022.2| 019.05| 09.52
5. Pipe diameter for 2 pipes and multi kit.
   Total HP indoor unit Gas| Liquid| Total HP indoor unit| Gas| Liquid
   ---|---|---|---|---
   < 6 I o15.88| o9.52| (12-15.99)| 025.4| 012.7
   (6-8.99) I o19.05| o9.52| (16-17.99)| 028.58| 012.7
   (9-11.99) I o22.2| o9.52| (18-25.99)| 028.58| 015.88
6. Pipe diameter between multi kit and indoor unit(4).
   HP indoor unit I Gas| Liquid| HP indoor unit| Gas| Liquid
   ---|---|---|---|---
   (0.8-1.5) I 012.7| o6.35(5)| 8.0| o19.05| 09.52
   2.0 I 015.88| o6.35(5)| 10.0| o22.2| 09.52
   (2.5-6.0) I 015.88| o9.52| —| —| —

Pipe working conditions

r
Part| Make| Permitted pipe length 03) 1
---|---|---
≥ Recommended number
of connected indoor units| ≥ Recommended number
of connected indoor units
Total pipe length| Current total liquid
pipe length| ≤ 1000 m(14)| ≤ 300 m
Maximum pipe length|  Current length| L1| ≤ 165 m| ≤ 165 m
Equivalent length
≤190 m| ≤190 m
Maximum pipe length between the multikit of the first branch and each indoor unit| L2| ≤ 90 m| ≤ 40 m
Maximum pipe length between each multikit and each indoor unit| L3| ≤40 m| ≤ 30 m
Total pipe length between the CH unit and each indoor unit| *L4

• a+b+c+d+e| CH-6.0N1: ≤ 30 m| CH-6.0N1: ≤ 30 m
  CH-10.0N1: ≤ 10 m| CH-10.0N1: ≤ 10 m
  Pipe length between connection kit 1 and each outdoor unit| L5| ≤ 10 m| ≤ 10 m
  Difference in height between outdoor and indoor units| Highest outdoor unit| H1| ≤ 50 m| ≤ 50 m
  ≤ 40 m| ≤ 40 m
  Lowest outdoor unit
  Difference in height between indoor units| H2| ≤ 15 m| ≤ 15 m
  Difference in height between indoor units using the same CH unit| F-13| ≤ 4 m| ≤ 4 m
  I Difference in height between CH units| H4| ≤ 15 m| ≤ 15 m
  Difference in height between outdoor units| H5| ≤0.1 m| ≤ 0.1 m

NOTE

• (1)The connection kit is taken into account from the side of the indoor unit (as connection kit 1).

• (2) When the maximum equivalent refrigerant pipe length (L1) from the outdoor unit/connection kit 1 to the indoor unit is greater than 100 m, the diameter of the liquid pipe from the outdoor unit/connection kit 1 to the first branch must be in- creased using the reducer (field-supplied).

• (3) Where the refrigerant pipe length is greater than 100 m, the pipe diameter does not have to be increased after the first branch. Where the size of the multikit is greater than that of the first branch, adjust the size of the multikit to the first
  branch. Where the diameter of the pipe selected after the first branch is greater than the diameter of the pipe after it, use the same diameter as the inlet pipe.

• (4) The pipe diameter -6- must be the same as that of the in- door unit connection.

• (5) Where the liquid pipe length is greater than 15 m, use 9.53 mm diameter pipe and a reducer (field-supplied).

• (6) Keep a straight distance of 500 mm or greater after the connection kit.

• (7) In the case of branches, where the pipe length between the three-pipe branch -F- and the furthest indoor unit exceeds 5 m, use a T-branch pipe for the three-branch liquid pipe (corresponding to the same diameter, as per JIS B8607).

• (8) Where the number of connectable indoor units is greater than four, the high Now-pressure gas, gas and liquid pipes, -4-, -5- and -6-, must be increased by one measurement, respectively.

• (9)The liquid pipe does not have to be connected to the CH unit. See Table 6 for the pipe diameter between the multi kit and the indoor unit.

• (10) Where the combination of indoor unit capacities is 10 HP for the CH-10.0N1 unit, performance will drop by approximately 5% in refrigeration and 10% in heating.

• (11)  The excess total capacity may lead to insufficient performance and abnormal operating noise. Check that the installation is within the total capacity values.

• (12)For operations in cooling mode only, connect the indoor units using gas and liquid pipes (without the CH unit). The total capacity in cooling mode only must be less than 50% the total capacity of the indoor units.

• (13)The installation conditions for the refrigerant pipes are different depending on the number of indoor units connected.

• (14) The total pipe length permitted must be less than 1000 m due to the maximum additional refrigerant charge limitation.

•  (15)Where the branch is after the CH unit and the capacity of the connected indoor unit is (0.8-1.5) HP. use a 15.88 mm diameter for the gas pipe.

NOTE

• Check that the gas pipe and the liquid pipe are equivalent in terms of length and installation system.
• Use the multi kit system for branching of the indoor units and the CH unit.
• Install the indoor unit, the multi kit and the CH unit according to the instructions given in this manual.
• Where the length of pipe L3 between each multi kit and each indoor unit is considerably longer than on another indoor unit, the refrigerant will not flow correctly and performance is lower in comparison with other models (recommended pipe length: up to 15 m).

Piping branch restriction

In the case that the piping length L2 from the Multi-Kit at the first branch to the farthest indoor unit is over 40m, follow the instructions below when performing the field-supplied piping work.

Example 1
Piping length from the multi kit at the first branch to the terminal Indoor Units is within 40-90 m.

1. The difference between the piping length from the first branch to the farthest indoor unit and the piping length from the first branch to the closest indoor unit must be within 40m.
   (g+h+j)-(b+d) < 40m

NOTE
DO NOT size up the piping for Heat Recovery System. Otherwise, it may cause failure.
Header branch can be used with line branch at the 3 pipes portion and 2 pipes portion. Header branch can also be used after the second branch. Do not connect a line branch to a header branch. When using header branch, make sure that the piping ength L2 from the Multi-Kit at the first branch to the farthest indoor unit is within 40m.

ADDITIONAL REFRIGERANT CHARGE

9.1 AIR-TIGHT TEST

Check to ensure that spindles of the stop valves for High/Low pressure gas, Low pressure gas and Liquid pipes are closed completely before air-tight test. The refrigerant used for this outdoor unit is R410A. Use the manifold gauge and the charging hose for exclusive use of R410A.

* Tightening check of stop valves
After connecting the pipe, remove the caps of stop valves for high/low pressure gas, low pressure gas (for heat recovery system only) and liquid. Tighten the open-close spindle in the closing direction according to the following tightening torque.
Caution for operation of stop valves

a. Remove the stop valve caps before performing the air- tight test after connecting the refrigerant piping. Tighten the spindle (valve) in clockwise direction according to the following tightening torque.
b. Perform the work after warming the spindle part with a dryer etc. when controlling the stop valve in a cold area. (O-ring of the spindle part will harden at the low temperature and the refrigerant leakage may occur.)
c. Do not apply an excessive force after fully opening the spindle. (Tightening Torque: < 5.0N-m) (The back seat is not provided.)
d. When each valve is opened, remove tags “Close” (Accessories) and attach tags “Open” instead.
e. Tighten securely the caps according to the following tightening torque after each spindle valve is opened

Outdoor unit| spindle (valve)| Flare Nut| Cap| Check joint
---|---|---|---|---
high/low pressure and low pressure
gas valves| liquid valve| liquid| high/low pressure
and low pressure
gas valves| liquid valve| high/low pressure
and low pressure gas valves| liquid valve
5 – 12HP| 18.0 – 22.0| 7.0 – 9.0| 33.0 – 42.0| 49.0 – 58.0| 33.0 – 42.0| 9.0 – 14.0| 9.0 – 14.0

*Air-tight test method

Connect the manifold gauge to the check joints of the liquid line and the gas line stop valves using charging hoses with a vacuum pump or a nitrogen cylinder. Perform the air-tight test. Do not open the stop valves. Apply nitrogen gas pressure of 4.15MPa for FSXNH series. For checking gas leakage, use the leak detector or forming agent. If there is any leakage, fix the leaking part. For checking gas leakage, do not use a forming agent which generates ammonia. Additionally, do NOT use a household detergent as forming agent whose components are not clear. The recommended foaming agent for checking gas leakage is shown below.

DANGER
Be sure to use Nitrogen Gas for air-tight test. If other gases such as oxygen gas, acetylene gas or fluorocarbon gas are accidentally used, it may cause an explosion or gas intoxication.

Insulation work

1. Securely insulate high/low pressure and low pressure (for heat recovery system only) gas piping side and liquid piping side individually. Make sure to insulate the union flare nut forthe piping connection as well.
2. Mount the piping cover equipped with the outdoor unit after connecting the pipe. Completely seal the penetration part atthe bottom of the pipes with insulation in order to prevent rain water from entering the conduit.
3. Cover the gap between the piping cover and pipes with a packing (field-supplied) after the insulation work is completed.

NOTE

If the gap is not covered, the unit may be damaged if snow, rain water or animals enter the unit.

9.2 VACUUMING

1. Connect a manifold gauge and vacuum pump to the check joints*.
   heat pump system| High/low pressure gas stop valve
   Liquid stop valve
   ---|---
   heat recovery system| High/low pressure gas stop valve
   Low pressure gas stop valve
   Liquid stop valve
2. Continue vacuum pumping work until the pressure reaches -0.1MPa (-756mmHg) or lower for one to two hours. After vacuum pumping work, stop the vacuum pumping and leave the gauge for one hour. Check to ensure that the pressure in the manifold gauge does not increase.
3. Tighten the caps of check joint according to the specified torque (Item 8.1-(2)-(e)) after the vacuum pumping work.
4. If the pressure inside the gauge does not reach -0.1MPa (-756mmHg), it is considered that there is a gas leakage.
   Check for any gas leakage once again. If no leakage exists, operate the vacuum pumping for one to two hours. If moisture remains inside the pipes, the compressor may be damaged.

NOTE

• If tools or measuring instruments come into contact with the refrigerant, use the tools or the measuring instruments exclusively for R410A.
• DO NOT perform vacuuming pumping work with valves of the outdoor units open. Otherwise, the refrigerant charged before shipment may leak and it may result in failure.

9.3 ADDITIONAL REFRIGERANT CHARGE CALCULATION

Although refrigerant has been charged into this unit in advance, additional refrigerant charge is required according to piping length.
Determine the additional refrigerant quantity according to the following procedure, and charge the system with it.
Record the additional refrigerant quantity to facilitate maintenance and servicing activities thereafter.
Calculating method of additional refrigerant charge (W kg)

NOTE

• Some refrigerant charge calculations differ when installing Wall Type (RPK-FSNH3M Series) with the expansion valve kit. Refer to the item Additional refrigerant calculation for wall type (RPK-FSNH3M Series) with the expansion valve kit.

• Ensure that the total additional charge quantity should not exceed the max.
  additional refrigerant charge quantity shown in the table on the next page.

• Maximum additional refrigerant charge quantity

hP| 5 – 10| 12| 12-P,
14, 16| 18 – 24| 24-P
26 – 54
---|---|---|---|---|---
Maximum additional
refrigerant charge
quantity (kg)| 28| 36| 40| 51| 63

Charging work
Charge the system with refrigerant R410A according to Item 8.4.

Record of additional charge

• Refrigerant charge amount of outdoor unit before shipment (W0) kg

NOTE

• W0 is outdoor unit refrigerant charge before shipment.
• In case of the combination of the base units, calculate the total refrigerant charge before shipment of the outdoor units to be combined.
  Regarding the fluorocarbon, follow the specification label or refrigerant label attached to the product. After the additional refrigerant charge, record the total refrigerant (= refrigerant before shipment + additional refrigerant in the field) in the refrigerant label ().
  (): In case of the combination of base units, record the total refrigerant in the main unit label.

NOTE

When the refrigerant is recovered or charged because of repairing, operating or adjusting the unit, record the refrigerant quantity again.

NOTE

• Emissions of the fluorocarbons without any reason are prohibited.

• For disposal and maintenance of this product, collection of fluorocarbons is required.

• Additional refrigerant calculation for wall type (RPKFSNH3M series) with the expansion valve kit
  The additional refrigerant calculation for wall type (RPK-FSNH3M Series) with the expansion valve kit is as follows. Refer to the item Calculating method of additional refrigerant charge W1.
  Firstly calculate the additional refrigerant amount for the liquid pipe between Multi-Kit and the expansion valve kit according to the piping length and diameter.
  Then, calculate the additional refrigerant amount for the liquid pipe between indoor unit and the expansion valve kit (Pipe diameter: ∅6.35 refrigerant amount for 1m pipe: 0.011kg/m).

NOTE
Refer to the table System Combination for the number of indoor units and the expansion valve kit connectable to the outdoor unit.

9.4 CHARGING WORK

The additional refrigerant charge is required according to the total piping length. Refer to Table 8.1.
After vacuum pumping work, check that the high/low pressure gas valve, low pressure gas valve (low pressure gas valve is for heat recovery system only) and liquid stop valve are fully closed.
Charge the additional refrigerant from the check joint of liquid stop valve (acceptable error must be within 0.5 kg).
After the refrigerant has been charged, fully open the liquid stop valve and the gas stop valves.

NOTE

The gas staying at O-ring or screw part may make sound when removing the cap of the spindle. However, it is not gas leakage.
If it is impossible to charge the specified quantity of refrigerant, follow the procedure below:
a. Fully open the stop valve for the gas line. (For heat recovery system, both stop valves of high/low pressure and low-pressure side).

CAUTION
Do not apply an excessive force to the spindle valve after fully opening the spindle. Otherwise, the spindle valve flies out due to refrigerant pressure. At the test run, open fully the spindle valve, otherwise, the devices will be damaged. (It is closed before shipment).

Caution for opening stop valve

1. Do not apply an excessive force after fully opening the spindle. (Tightening Torque: < 5.0N-m). (The back seat is not provided.)
2. When the valve is opened, remove the tags “Close” (Accessories) and attach the tags “Open” (Accessories) instead.
3. Tighten securely the caps according to the tightening torque (Item 8.1-(2)-(e)) after each spindle valve is opened.b. Operate the compressor in the cooling mode and charge the additional refrigerant from the check joint of the liquid stop valve (acceptable error must be within 0.5 kg). At this time, keep the liquid stop valve slightly opened
   c. After the refrigerant is charged, fully open the liquid stop valve and the gas stop valve.
   d. Calculate securely the additional refrigerant quantity for charging. If the quantity of additional refrigerant is not correct, it may cause compressor failure. The additional refrigerant must be charged in a liquid condition.
   e. Refrigerant charge from check joint of gas stop valve may lead to compressor failure. Be sure to charge refrigerant from the check joint of liquid stop valve.

* heat pump system

* heat recovery system

Charge the correct refrigerant quantity according to Additional refrigerant charge. If not, a compressor may be damaged due to an excess or insufficient refrigerant charge.
Refrigerant charge from check joint of gas stop valve may lead to compressor failure. Be sure to charge refrigerant from the check joint of liquid stop valve.
Insulate the liquid piping and gas piping completely to avoid decreasing of performance and dewing on the surface of the pipe.
Insulate the flare nut and union of the piping connection with insulation.
Check to ensure that there is no gas leakage. If a large refrigerant leakage occurs, it will cause difficulty with breathing or harmful gases would occur if a fire was being used in the room.

9.5 AUTOMATIC SIMPLE JUDGEMENT SYSTEM FOR REFRIGERANT AMOUNT

NOTE

• This function is applicable when outdoor air temperature is 0 to 43ºC DB and indoor air temperature is 10 to 32ºC DB.
• Operation check or condition check shall be performed by checking the PCB1 for the outdoor unit. During the checking, do not remove the front cover. Otherwise, the checking will not be conducted normally due to pressure increase. For combination outdoor unit, the checking shall be conducted at the unit A and so service covers for the other unit (B, C or D) must be closed.

Perform the refrigerant amount check operation according to the automatic judgement function after the refrigerant charging work.
When the judgement result is excessive refrigerant, insufficient refrigerant or abnormal termination, find out the cause of abnormality and perform the refrigerant amount check operation again.

*  Procedure of refrigerant amount check operation

1. Reassemble all the cover except for the electrical control box cover and service cover of No.1 unit.

2. Turn ON the power supply of indoor unit and outdoor unit in the refrigerant cycle to perform the refrigerant amount check operation. (Supply electrical power to the system 12 hours before starting this check operation to warm the compressor oil.)

3. Turn number 4 of DSW5 (PCB1) ON. The 7-segment display will be indicated as follows:

4. Check the 7-segment display and press PSW1. The outdoor fan and compressor will be in standby state and the 7-segment display will be indicated as follows: The outdoor fan and compressor will be activated and the 7-segment display will be indicated as follows: The judgement takes 30 to 40 minutes. Refer to the table below for the result indication.
   When the judgement result is excessive refrigerant, insufficient refrigerant or abnormal termination, find out the cause of abnormality and perform the refrigerant amount check operation again.

5. Turn OFF number 4 pin of DSW5 when the refrigerant amount is sufficient. Wait for at least 3 minutes after turning OFF number 4 pin of DSW5 OFF and then the outdoor unit is ready to operate.

Judgement result indication

• Turn the pin number 4 of DSW5 OFF and perform the test run.
| Excessive
refrigerant| The refrigerant amount is excessive.
• Calculate the additional refrigerant amount according to the piping length. Collect the refrigerant using a
collector and charge the correct refrigerant amount.
| Insufficient
refrigerant| The refrigerant amount is insufficient.
• Check if the additional refrigerant has been charged.
• Calculate the additional refrigerant amount according to the piping length and charge the refrigerant.
| Abnormal
termination| Find out the cause of abnormal termination as shown below.  After resolved the cause of abnormal termination,
restart the check operation.
1 Is number 4 pin of DSW5 ON before turning on the power supply?
2 Are all indoor units ready and waiting, before turned ON number 4 pin of DSW5?
3 Is the outdoor ambient temperature within the applicable range (0 to 43ºC DB). (In some cases, when the connected indoor unit number exceeds the recommended number and the outdoor ambient temperature exceeds 35ºC DB, this check operation cannot be performed.)
4 Is the total indoor units operation capacity 30% (indoor units capacity ratio) or less?
5 Is the pin number 4 of DSW4 (compressor forced stoppage) OFF?

NOTE
The 7-segment indication during the check operation may be changed to the protection control code by the activation of protection control. However, it is normal. As for the protection control code, refer to the sheet attached to the inside of the outdoor unit service cover.

Special attention regarding refrigerant gas leakage
Pay attention to the critical gas concentration to avoid accidental refrigerant gas leakage before installing air conditioning systems.

• In case of KHK S 0010, this value should be decided according to each country’s regulation such as ISO5149 and EN378.

In the case that the calculated critical concentration is higher than 0.3kg/m , take the following actions.

1. Provide a gas leakage detector and exhaust fan(s) controlled by its gas leakage detector.
2. Provide each effective opening at the wall or door for ventilation to next door so that the critical gas concentration can be maintained lower than the above value. (Provide an opening more than 0.15% of floor surface at the lower part of a door.)

CAUTION

1. Maximum permissible concentration of HFC GAS R410A. The refrigerant R410A is an incombustible and non-toxic gas. However, if leakage occurs and gas fills a room, it may cause suffocation. The maximum permissible concentration of HFC gas, R410A in air is 0.3 kg/m , according to the refrigeration and air conditioning facility standard (KHK S 0010) by the KHK (High Pressure Gas Protection Association) Japan. Therefore, some effective measure must be taken to lower the R410A concentration in air below 0.3kg/m 3 3 , in case of leakage. As for R410A, this consideration is applied similarly.
2. Calculation of refrigerant concentration:
   1. Calculate the total quantity of refrigerant R (kg) charged in the system connecting all the indoor units of objective rooms.
   2. Calculate the room space where this unit is to be installed V (m ) of each objective room.
   3. Calculate the refrigerant concentration C (kg/m³ ) of the room according to the following equation. If local codes or regulations are specified, follow them. Example:
   Japanese Standard KHK S 0010 C=0.3 (kg/m3)

9.5.1 Precautions in the event of refrigerant leaks

DANGER

Fitters and the designers of the installations must strictly observe local and national legislation, and local codes regarding safety requirements in the event of refrigerant leaks.

• Maximum permitted concentration of hydrofluorocarbon (HFC)
  The R410A refrigerant gas, used in the equipment, is fireproof and not toxic.

DANGER

In the event of a leak, the gas will spread around the room, displacing the air, and could therefore result in asphyxia.
, in accordance with standard EN378-1. Therefore, efficient measures should be adopted to ensure the concentration of R410A gas in the air is kept below 0.44 kg/m³ The maximum permitted concentration of HFC R410A gas in the air is 0.44 kg/m 3 3 in the event of a leak.

*  Calculation of the refrigerant concentration

1. Calculate the total quantity of refrigerant R (kg) charged in the system; to do so, connect all the indoor units of the rooms in which you wish to have air conditioning.
2. Calculate the volume V (m) of each room.
3. Calculate the refrigerant concentration C (kg/m³) of the room according to the following formula:
   R / V = C
   R: Total quantity of refrigerant charged (kg).
   V: volume of the room (m³).
   C: concentration of refrigerant (= 0.44 kg/m³for R410A gas).

Countermeasures in the event of refrigerant leaks

The room should have the following characteristics in case of a leak of refrigerant:

1. Opening without shutter to permit the circulation of fresh air in the room.
2. Opening without door measuring 0.15%, or greater, of the floor surface.
3. A fan with a capacity of at least 0.4 m³ /minute per tone of Japanese refrigerant ( = volume displaced by the compressor / 5.7 m³ /h) or greater, connected to a gas sensor in the air conditioning system which uses the refrigerant.

DANGER

Special attention should be given to areas where the refrigerant may be deposited and stay in the room, such as basements or similar, as it is heavier than air.

9.5.2 Drainage pipes
Condensation drainage system

When the outdoor unit operates in refrigeration or heating mode, there is a build-up of condensation of the ambient humidity which, together with rain water, requires draining.
Select a location for the unit which permits adequate drainage.
If necessary, mount an installation suitable for the drainage of condensation.

DANGER

• Drainage must not take place in areas frequented by pedestrians. In low temperatures, the drainage water could freeze and lead to falls. If it is necessary to install the outdoor unit in an area frequented by pedestrians, an additional drainage tray should be fitted.
• Do not fit drainage pipes or collection trays in cold climates, as they could freeze and break.
  If a condensation drainage kit is required for the outdoor unit, use the optional drainage kit DBS-TP10A.

NOTE

All measurements are in mm.
Base of outdoor unit

A. Drainage hole. Drain boss position (option). For the optional drainage kit DBS-TP10A.
B. Drainage hole. Drain cap position (option) For optional drainage plug.
C. Opening for power wiring feed through.
D. Opening for communication wiring feed through.
E. Opening for feed through of refrigerant pipes.

* Installation position of the optional drainage kit DBs-TP10A
Installation position (example: RAS-10FSxNH, lower and side views).

Drain kit components

Model| Description| Material/ colour| Qty| Application
---|---|---|---|---
DBSTP10A| Drain pipe| PP/black| 2| Drain pipe connection
Drain plug| PP/black| 2| Drain pipe plug
Rubber plug| CR/black| 4| Pipe and plug seal

ELECTRICAL WIRING

10.1 GENERAl INFORMATION

CAUTION

• Before any work to the electrical wiring or regular inspections, switch off the mains power supply of the indoor and outdoor units. Wait three minutes before starting installation or maintenance work.
• Make sure that the interior and exterior fans have come to a complete standstill before starting work on the electrical wiring or regular inspections.
• Protect cables, the drainage pipe, electrical components, etc. from rodents and insects; otherwise these might damage unprotected components and this could result in fire.
• Do not allow cables to come into contact with the refrigerant pipes, metal edges, printed circuit boards (PCB) or the electric components inside the unit; the cables may be damaged and this could result in fire.
• Firmly secure the cables inside the indoor unit with plastic flanges.

DANGER

• Use an earth leakage breaker with medium sensitivity, and an activation speed of 0.1 or less. If this is not fitted, there is a risk of electric shock and/or fire.
• Install an earth leakage breaker, fuse and circuit breaker for each outdoor unit power line. Not fitting it may cause an electric shock or fire.

10.2 GENERAL VERIFICATIONS

1. Make sure the electric components supplied by the fitter (main power switches, circuit breakers, wires, connectors and connection terminals) have been selected correctly in line with the electrical data given.
   a. The electricity supply to the unit should be via an exclusive power control switch and protective circuit breaker, certified and installed in accordance with local or national safety regulations.
   b. Connect the power supply wiring for each group of indoor units to its outdoor unit group (maximum capacity for each group of indoor units: 26 HP). Do not mix units of different groups.
   c. For heat recovery systems, the CH unit and the indoor unit of the same refrigerant cycle can be supplied from the same mains power switch.

2. Check that the supply voltage is between 90 and 110% of the rated voltage. Where the voltage capacity is too low, it will not be possible to start the system due to the drop in voltage.

3. Sometimes, the refrigeration/heating system is not able to op- erate correctly in the following cases:
   • When the system is supplied from the same supply line as other major consumers (heavy machinery, power inverter systems, cranes, welding machinery, etc).
   • When the supply cables of the major consumers and the refrigeration/heating system are very close together. In these cases, induction in the wiring to the refrigeration/heating system may arise due to a rapid change in the electricity consumption of the above consumers and their start-up. Therefore before starting installation work, check the regulations and standards concerning adequate protection of the power supply line.
   NOTE
   For further information, please refer to the applicable legislation in the country in which the unit is to be fitted.

4. During the preliminary preparation work of the electricity supply line for the unit, the provisions in local and national legislation must never be violated.

5. Check that the earth cable is correctly connected.

DANGER

• Never connect the earth cable to the refrigerant pipes.
  The gas in the pipes could cause a fire.

• Do not connect the earth cable to the lighting rod. The electrical potential of earth would increase abnormally.

1 0.3 CONNECTION OF THE POWER SUPPLY CIRCUITS

Power source wiring.
Supply the power sources to each outdoor unit and indoor unit group respectively. Power source wiring is fundamentally according to this method.

*  heat pump system

* heat recovery system

10.3.1 Cable sizes
Field minimum wire sizes for power source and transmission

Model| Power supply| Maximum
running current| (4)Power source cable size| (6)(7)Transmitting cable size| (5)
Earth wire size (mm²)
---|---|---|---|---|---
(A)| EN60 335-1(1)
1
(mm²)| EN60 335-1(1)
1
(mm²)
RAS-5FSxNH| 3N~ 400V/50Hz| 13| 4.0| 0.75| 4.0
RAS-6FSxNH| 13| 4.0| 0.75| 4.0
RAS-8FSxNH| 15| 4.0| 0.75| 4.0
RAS-10FSxNH| 18.7| 6.0| 0.75| 6.0
RAS-12FSxNH| 20| 6.0| 0.75| 6.0

• Refer to the NOTES for selection of the power source cable size.
  (1) The cross-sections of the cable should be selected for the maximum current of the unit, in accordance with European Standard EN60 335-1.

NOTE
Do not use cables that are lighter than the normal flexible coated polychloroprene cable (code H05RN-F).
10.3.2 Main breaker switch

Electrical data and recommended wiring, breaker size/1 outdoor unit

Model| Power supply| Maximum

running
current
(A)

| Power supply
line
(∅ mm)| 1 ElB 1)| 3 Main switch| 2 Fuse
(A)
---|---|---|---|---|---|---
Nominal
current
(A)| Nominal sensitive
current
(mA)| Nominal current (A)
RAS-5FSxNH| 3N~ 400V/50Hz| 13.0| MLFC 2.0SQ| 40| 30| 20| 20
RAS-6FSxNH| 13.0| MLFC 2.0SQ| 40| 30| 20| 20
RAS-8FSxNH| 15.0| MLFC 2.0SQ| 40| 30| 20| 20
RAS-10FSxNH| 18.7| MLFC 3.5SQ| 40| 30| 30| 30
RAS-12FSxNH| 20.0| MLFC 3.5SQ| 40| 30| 30| 30

ELB: Earth leakage Breaker(1), MLFC: Flame Retardant Polyflex Wire
Install main switch and ELB for each system separately. Select the high response type of ELB that acts within 0.1 second.
10.3.3 voltage supply

• service voltage
  Between 90 and 110% of the rated voltage.

• start-up voltage
  Between 85 and 115% of the rated voltage.

• voltage imbalance
  Up to 3% in each phase, measured at the main terminal of the outdoor unit.

• Electromagnetic compatibility
  According to Directive 2004/108/EC (89/336/EEC) regarding electromagnetic compatibility, the following table indicates: the maximum allowed impedance Zmax of the system at the connection point of the user’s power supply, as
  per EN61000-3-11.

*harmonics
In relation to IEC 61000-3-2 and IEC 61000-3-12, the situation of harmonics for each model is as follows:

,
Situation of the models in relation to IEC 61000- 3-2 and IEC 61000-3-12 Ssc “xx”| Model| Ssc
“xx”
(kVA)
---|---|---
Unit compliant with IEC 61000-3-2 (professional use).| RAS-5FSXNH| —
RAS-6FSXNH|
RAS-8FSXNH| —
| | —
Unit compliant with IEC 61000-3-12.| —| —
Installation restrictions may be applied by supply authorities in relation to harmonic.| RAS-10FSXNH
RAS-12FSXNH| —

10.4 ELECTRICALWIRING FOR OUTDOOR UNIT

Connect the electrical wirings according to the following figures.

1. Connect the power supply wires to L1, L2, L3, and N (for 400V) for the three phase power source on the terminal board TB1 and earth wire to the terminal in the electrical control box.
2. Connect the transmission wires between the outdoor and indoor units to the TB2 terminals 1 and 2 on the PCB1. As for the transmission wires between outdoor units in the same refrigerant cycle, connect them to the TB2 terminals 3 and 4 on the PCB1.
3. Tighten screws for the terminal board according to the following table.
   size| Tightening Torqu e
   ---|---
   M4| 1.0 to 1.3| N-m
   M5| 2.0 to 2.4| N-m
   M6| 4.0 to 5.0| N-m
   M8| 9.0 to 11.0| N-m
   M10| 18.0 to 23.0| N-m

CAUTION

Be sure to note the following points to run the cables under the unit using conduit tube. (The pipe cover needs to be removed before performing piping and wiring works.)

NOTE

• Do not run the power supply wiring and transmission wiring through the same conduit tube. Moreover, keep at least 5cm between the power supply wiring and transmission wiring.
• Pull out each wiring from each corresponding knockout hole. Cut can “X” in rubber bush (accessory) and securely attach it to the knockout hole for cable protection. Check that the rubber bush is surely attached.
• Attach the pipe cover to prevent rats or other small animals from entering the unit.
• Prevent the wirings from touching or rub against the refrigerant pipes, plate edges and electrical parts inside the unit.
• When the power source cable (capture cable) whose size exceeds 38mm2 is used, peel the sheath part of the cable put into the unit and run it. At this time, do not damage the coated insulating coated part.
• Completely seal the end of conduit tube with sealing materials to prevent the rain from entering the conduit tube.
• Make a drain hole at the lowest part of the conduit tube.

CAUTION
Tightly secure the power source wiring using a cord clamp inside the unit.

NOTE
Fix the rubber bushes with adhesive when conduit tubes to the outdoor unit are not used.

10.4.1 Connection of indoor units
Connect each outdoor unit to a power supply line. Install an earth leakage breaker, fuse and circuit breaker for each outdoor unit power line.
Connect each group of indoor units corresponding to an outdoor unit to a voltage supply line (maximum capacity for each group of indoor units: 26 HP). Install an earth leakage breaker, fuse and circuit breaker for each group of indoor units.
Connect the communication cable between the indoor units, the CH units and the outdoor units.
Connect the communication cable on the corresponding units to the same refrigerant cycle. (Where the refrigerant pipe of the indoor unit is connected to the outdoor unit, connect the communication cable to the same indoor unit).

NOTE

Connecting the refrigerant pipe and the communication cable to units in different refrigeration cycles may lead to operating problems.
Use shielded twisted pair cable or shielded pair cable. Do not use cable with three or more conductors.
Use the same type of cables for the H-LINK system of units in each refrigerant cycle.
Ensure a minimum distance of 50 mm between the power cables and the communication cables and 1500 mm between these and the power cables of other electrical devices. Where this is not possible, install power cables in a metal duct separate from the others.
Connect the communication cables to TB2 terminals 1 and 2 on outdoor unit A (main unit):

• Between the outdoor unit and the indoor unit.
• Between the outdoor unit and the CH unit.
• Between the outdoor unit and the indoor unit on other refrigeration cycles.

CAUTION

Do not connect power cables to communication terminals (TB2).
This could damage the circuit board.
In heat recovery systems, connect the indoor unit communication cable (used exclusively for refrigeration) to TB2 terminals 1 and 2 on the CH unit.
Connect the earthing cable for the outdoor units, the indoor units and the CH units. Earthing connections below a resistance of 100 ω (max.) must be made by skilled personnel.

NOTE

• Set the DSW switches on the main and secondary units for the combination of (14-36) HP outdoor units.
• An alarm is triggered if the communication cables between the outdoor units are connected to terminals 1 and 2 for H-LINK II.
• Where an alarm is indicated on the display of the main outdoor unit, follow the instructions given to make the necessary checks.
• Make the function settings from the main outdoor unit.
• Maximum number of refrigeration groups with one remote control: 64. Maximum number of indoor units connected: 160.

Connection diagram: heat pump system

DC non-polar H-LINK (field-supplied)
C| Distribution box (field-supplied)
D| Indoor units
E| Remote control wire (shielded twisted pair cable or shielded pair cable) (field-supplied)
F| Fuse (field-supplied)
G| PC-ART remote control
H| Indoor unit system number 0
I| Indoor unit system nubmer 1
J| Transmission wire between A and A1
CB| Circuit breaker (field-supplied)
ELB| Earth Leakage Breaker (field-supplied)

* Connection diagram: heat recovery system

non-polar H-LINK (field-supplied)
C| Distribution box (field-supplied)
D| Indoor units
E| Operation wiring (shielded twisted pair cable or shielded pair cable) (field-supplied)
F| Fuse (field-supplied)
G| PC-ART remote control
H| Indoor unit system No 0
I| Indoor unit system No 1
J| CH unit
K| Transmission wire between A and A1
CB| Circuit breaker (field-supplied)
ELB| Earth Leakage Breaker (field-supplied)

10.5SETTING OF THE DSW SWITCHES ON PCB1

Location of the DSW switches on PCB1.

CAUTION
Before changing the settings of the DIP switches, the voltage supply should be disconnected. Otherwise, the new settings will not be valid.
NOTE

• Only the DIP DSW1, DSW2 and DSW4 switches can be set while the voltage supply is connected.
• The symbol “■” indicates the position of the DIP switches. The figures show the position of the DIP switch once the position setting has been completed.
• With the DSW4 switch, the unit starts or stops after 10 to 20 sec. of the switch being enabled.
• Record the number of the outdoor unit to tell it apart from others during service and maintenance operations in this area:

DsW1, RsW1: refrigerant cycle number setting

Setting required
Setting before RSW1 supply: 0
Setting before DSW1 supply: 0 (digit of tens)
Set each main outdoor unit number on each refrigerant cycle (Subs-units setting are not
required)
Outdoor and indoor units belonging to the same refrigerant cycle: setting the same cycle number in the outdoor and indoor units(indoor units: DSW5 and RSW2)|
---|---

DsW1, RsW1: setting example for refrigerant cycle number 25

Maximum refrigerant cycle number setting: 63

DsW2: capacity setting

Setting not required

DsW3

Setting not required DsW4: test run and service settings

Setting required.

• A: setting before supply:
• B: refrigeration test run.
• C: heating test run.
• D: forced stop of the compressor.

DsW5: emergency operation /test run and service setting

Setting not required. Activate only when the following functions are used:

• Contact 1: except number 1, compressor operation.

• Contact 2: except number 2, compressor operation.

•  Contact 4: Monitoring of refrigerant quantity.

• Contact 5: High static pressure mode (≤60Pa).
  NOTE

• In the case of combination of the outdoor units(FSXNH: 14-36HP), set this function for all the outdoor units.

• While the unit operates in high static pressure mode, the operation sound value increases by3dB from the nominal value.

DsW6: setting outdoor unit number

Setting required
Setting before supply
NOTE
This combination of outdoor units must be set. Base unit (before shipment) Combination of base unit

DsW7: supply voltage setting

Setting not required DsW10: communication setting

Setting required.

• A: setting before supply:
• B: cancellation of final resistance.
  NOTE
  C: If the communication circuit fuse has opened, the PCB1 board can only be recovered by activating contact 2.

DsW10: switch setting example

A. Main unit.
B. Secondary unit.
C. Secondary unit.
D. Indoor units.
E. Remote contro

10.6 FUNCTION SETTING

10.6.1 External Input/Output and Function setting
*start of setting*
Turn ON DSW4-No.4. Press PSW1 for 3 seconds or more. “Menu Mode” will be indicated.
End of setting
Press PSW1 for 3 seconds or more when “Menu Mode” is displayed. The display indication become normal. Turn OFF DSW4 number 4.
NOTE**
Release “Menu Mode” after the setting is completed. Otherwise, the air conditioner may not operate appropriately.![HITACHI RAS-FSXNH Air Conditioning

• Output and Function setting](https://manuals.plus/wp-content/uploads/2024/08 /HITACHI-RAS-FSXNH-Air-Conditioning-Output-and-Function-setting.png)

Arrangement of DIP switch setting

1. External input and output setting
   By pressing the push-switches PSW3 (►) and PSW5 (◄), the function number can be selected.
   PSW4 (▼): forward, PSW2 (▲): backward Fill out the selected function setting number in the space of the table as shown.
   Fill out the selected function setting number in the space of the table as shown.
   Example :Item| SEG2| SEG1| SET
   ---|---|---|---
   1| Input Setting 1 CN17 (1-2 pin)| | |
   2| Input Setting 2 CN17 (2-3 pin)| | |
   3| Input Setting 3 CN18 (1-2 pin)| | |
   4| Output Setting 1 CN16 (1-2 pin)| | |
   5| Output Setting 2 CN16 (1-3 pin)| | |

(Setting before shipment)
Before shipping, the input/output function settings are specified to each input/output terminal according to above table. The details of function number and external input/output settings are as shown below.
Setting of external input and output function:

The same input/output function setting cannot be set to different input/output terminals. If set, a setting of larger function number becomes invalid.
Example : When setting of input 1 and input 2 are same, input 2 will be invalid.

2. Function Setting
   By pressing the push-switches PSW3 (►) and PSW5 (◄), the setting can be changed.
   PSW4 (▼): forward, PSW2 (▲): backward Refer to the Service Manual for more details.
   Fill out the selected function setting number in the space of the table as shown.
   Example: Item| SEG2| SEG1| SET
   ---|---|---|---
   1| Circulator function at heating Thermo-OFF| | |
   2| Night-Shift (Low noise)| | |
   3| Cancellation of outdoor ambient temperature limit| | |
   4| Defrost for cold area (change of defrost condition)| | |
   5| SLo (fan speed) defrost setting| | |
   6| Cancellation of hot start| | |
   7| Priority capacity mode| | |
   8| Compressor frequency control target value for cooling| | |
   9| Compressor frequency control target value for heating| | |
   10| Indoor expansion valve control target value for cooling| | |
   11| Indoor expansion valve control target value for heating| | |
   12| Indoor expansion valve opening during heating operation stoppage| | |
   13| Indoor expansion valve opening during heating thermo-off| | |
   14| Indoor expansion valve initial opening during heating thermo-on| | |
   15| Indoor expansion valve initial opening for cooling| | |
   16| Outdoor expansion valve initial opening for heating| | |
   17| Sound reduced function| | |
   18| Demand function setting| | |
   19| Wave function setting| | |
   20| Protection of decrease in outlet temperature for cooling| | |
   21| Not prepared| | |
   22| Adjustment of fan rotation (for multiple installation)| | |
   23| Not prepared| | |
   24| Thermo-off setting for outdoor unit after defrosting operation| | |
   25| Not prepared| | |
   26| Not prepared| | |
   27| Not prepared| | |
   28| Intermittent operation of outdoor fan motor| | |
   29| Indoor expansion valve control target value for cooling (only for RCI-FSN3 series)| | |
   30| Not prepared| | |
   31| Not prepared| | |
   32| Not prepared| | |
   33| Not prepared| | |

TEST RUN

11.1 PRELIMINARY CHECKS
The test run must be carried out according to the instructions given in chapter Carry out the Test Run.
DANGER
Do not use the system until all of the check points have been verified. As with the test run for the indoor unit, check the Installation and maintenance manual for the indoor unit and the CH unit.
Make sure the refrigerant pipes and communication cables between the outdoor and indoor units are connected to the same refrigeration cycle. Failure to do so could lead to abnormal operations or a serious accident.
Check that the setting of the refrigerant cycle DSW switches (DSW1 and RSW1 on outdoor units, DSW5 and RSW2 on indoor units) and of the unit number of the indoor units is suitable for the system. Check whether the DIP switch  setting specified on the printed circuit of the indoor and outdoor units is correct. Pay particular attention to the outdoor unit no., the refrigerant cycle no. and the terminal resistance.
Make sure the electrical resistance is greater than 1 Mω by measuring the resistance between the ground and the terminal of the electrical components. If not, do not use the system until the electrical leak has been detected and repaired. Do not apply voltage to the communication terminals.
Check that all cables, L1, L2, L3 and N (R, S and T) are correctly connected to the power line. If they are not correctly connected, the unit will not work and the remote control will indicate alarm code “05”. When this occurs, check and change the power line phase according to the sheet attached to the rear of the service cover.

CAUTION

Make sure the main power supply switch has been on for over 12 hours to heat up the compressor oil using the heating elements.
The FSxNH series outdoor units do not work for 4 hours after the power supply line has been connected (stoppage code d1-22).
Where the unit is to be started within 4 hours, release the protection control as follows:

1. Switch on the power supply to the outdoor unit.
2. Wait 30 seconds.
3. Press PSW5 on the outdoor unit PCB for more than 3 seconds to release code d1-22. Where a remote control is used for releasing, press Air Flow and Auto Louver at the same time for 3 seconds.

Where several base units are combined, stick the label on the main unit in a visible place (outdoor unit 1) so that the outdoor unit A can be easily identified. Do not stick the main label on the secondary unit (outdoor units 2 and 3).

CAUTION

Where the total insulation resistance of the unit is below 1 MΩ, the compressor insulation resistance may be low due to the refrigerant held in the compressor. This may occur if the unit is not used for long periods.

1. Disconnect the compressor cables and measure the insulation resistance of the compressor. If the resistance value is greater than 1 MΩ, the insulation fault has occurred in another electrical component.
2. if the insulation resistance is below 1 MΩ, disconnect the compressor cable on the inverter PCB. Then switch on the main power supply to apply current to the crankcase heating elements. Once current has been received for more than 3 hours, re-measure the insulation resistance. (Current may be required for longer, depending on the air conditions, the pipe length or the condition of the refrigerant) Check the insulation resistance and re-connect the compressor. Where the earth leakage breaker is tripped, check the recommended size: see in chapter Main breaker switch.

NOTE

• Make sure the electric components in the installation (earth leakage breaker, circuit breaker, cables, connectors and cable terminals) have been selected correctly in line with the electrical data given in this Manual. Also make sure that these components are compliant with national and local codes.
• Use shielded cables (> 0.75 mm2) for communication installation wiring to avoid electromagnetic noise. (Shielded cable must be less than 1000 m in total length and its size must be compliant with local codes.)
• Check the connection of the power wiring terminals (terminals “L1” to “L1” and “N” to “N”). AC supply voltage 3N~ 400V 50Hz. If it is different, some components could be damaged.

11.2 CARRY OUT THE TEST RUN

• Check that the stop valves on the outdoor unit are fully open (gas, low-pressure: only in heat recovery systems) and start the system. (Where base units are combined, check that the stop valves on all outdoor units connected are fully open).
• Carry out the test run on the indoor units in sequence, one by one. Then check the concordance of the refrigerant pipe system and the electrical wiring system. (System conformity cannot be checked if there are several indoor units operating at the same time.)
• Follow the procedure indicated below to carry out the test run. Make sure the test run is completed problem-free.

NOTE
Where there are two remote controls (main and secondary), first carry out the test run using the main remote control.

11.3 PC-ART REMOTE CONTROLLER

Press MODE and CHECK on the PC-ART remote control at the same time for 3 seconds to enable TEST RUN mode. TEST RUN will be displayed on the screen.
The total number of indoor units connected is indicated on the screen. For other optional remote controls (wireless remote control or remote control), follow the instructions given in the Installation and maintenance manual supplied with the optional remote control to carry out the test run.
Where several indoor units are controlled simultaneously using the same remote control, check that the number of indoor units connected is indicated on the screen.
Where the number indicated is incorrect, the automatic self-directing function is not correctly performed because the wiring is incorrect or there is electrical noise, etc. Switch off the power supply and repair the wiring before checking the following points. Do not switch on or off for the next 10 seconds.

• The indoor unit power supply is not switched on or the wiring is incorrect.
• Incorrect connection of the indoor units or of the communication cable.
• Incorrect setting of the RSW and DSW switches (cancelled setting) on the indoor unit PCB.

Press MODE to set the operating mode.
Press RUN/STOP. The on/off light switches on before the test begins. The 2-hour off timer will be automatically enabled. OFF Timer and 2HR will be displayed on the screen. The initial air flow setting is HI, although the setting can be changed.

• Check the working range: see in chapter Working range.
• Consider the following when the system is operating.
  – Do not touch any of the parts in the discharge gas area, as the compressor chamber and the pipes are at tempera- tures of over 90 °C.
  – Do not press the magnetic breaker button. This could cause a serious accident.
  – Do not touch any of the electrical components for at least 3 minutes after the main switch has been switched off.
  – Check that the settings of the refrigerant pipes and electrical wiring are for the same system. To do so, switch on the indoor units one by one.

Press AUTO LOUVER and check that the louver moves normally, with no abnormal noise. Press AUTO LOUVER again to stop the louver. If any abnormal noises are heard, remove the panel and adjust the installation of the connection parts on the cover in the corner of the panel. Make sure the panel is correctly fitted to the unit to prevent it from being deformed.
The temperature control will not be valid even though the protection device is enabled during the test run. If an alarm is triggered, locate the cause of the problem in chapter Alarm codes. Once the problem has been solved, restart the test run.
Check the temperature, pressure, operating frequency and numbers of the indoor unit connected on the 7 segment display, according to the “Checking the outdoor unit using the 7-segment display in PCB1” label attached to the rear of the front cover on the outdoor unit.
To complete the test run, wait for 2 hours or press the RUN/STOP button again.

11.4 PC-ARF REMOTE CONTROLLER

Press and hold “ ” (menu) and “ ” (return) simultaneously for atleast 3 seconds. The test run menu will be displayed.
Select “Test Run” by pressing “ ” and press “OK”. The test run screen will be displayed.
The total number of indoor units connected is indicated on the LCD (Liquid crystal display). The twin combination (one (1) setwith two (2) indoor units) is indicated as “2 units”, and the triple combination (one (1) set with three (3) indoor units) is indicated as “3 units”.

NOTE
When “00 unit” is indicated, the auto-address function may be performing. Cancel “Test Run” mode and set it again.
If the indicated number is not equal to the actual number of connected indoor units, the auto-address function is not performed correctly due to incorrect wiring, the electric noise, etc.
Turn OFF the power supply, and correct the wiring after checking the following points (Do not repeat turning ON and OFF within 10 seconds.)

• The power supply for the indoor unit is NOT turned ON or the incorrect wiring.
• Loose connection between indoor units or remote controlswitch
• Incorrect setting of indoor unit address (The indoor unit address is overlapped.)

Start test run.

Press “ ” (run/stop). The test run operation will start. The operation mode, the air flow volume, the air flow direction and the test run time can be set on the test run screen. Select the item by pressing “ ” and set the detail by pressing “ ”. The default setting of the test run time is 2-hour OFF timer.
Check the temperature conditions. The unit operation cannot be performed if the conditions are out of range. Refer to the table below for working range.
Example: The cooling operation is not performed if the outdoor temperature is below -5 ºC DB.

| Cooling operation| heating operation
---|---|---
Indoor
temperature| Minimum| 21ºC DB / 15ºC WB| 15ºC DB
Maximum| 32ºC DB / 23ºC WB| -27ºC DB
Outdoor
temperature| Minimum| 5ºC DB (*)| 20ºC WB (**)
Maximum| 43ºC DB| 15ºC WB

DB: Dry Bulb, WB: Wet Bulb

NOTE

(*) 10ºC DB ~ -5ºC DB, operation control range
(**) -12ºC WB ~ -20ºC WB, operation control range

Press “ ” or “ ”, select “LOUV.” and select “ ” (auto swing) by pressing “ ”. The auto swing operation will start. Check the operating sound at the louvers. If abnormal sound is generated from louvers, it may be caused by deformation of the air panel due to incorrect installation. In this case, install the air panel again without deformation. If abnormal sound is not generated, press “ ” again to stop the auto swing operation.
Though the temperature detections by the thermistors are invalid, the protection devices are valid during the test run. If an alarm occurs, refer to table Alarm Code and perform troubleshooting.
Then perform the test run again.
According to the label “Checking Method by 7-Segment Display” attached to the back side of the service cover of the outdoor unit, check the temperature, the pressure and the operation frequency of the specified portions, and check the number of the connected indoor units on 7-segment displays.

To finish the test run, wait for 2 hours (as default setting) or press “ “ (run / stop) switch again.

• Flashing the operation lamp for 2 seconds ON and 2 seconds OFF is for abnormality of the transmitting between the indoor unit and the remote control switch (loosened or disconnected connector, disconnected wires, or incorrect wiring etc.)
• Small sound may be heard from the outdoor unit after turning ON the power source because the electrical expansion valve is activated to adjust the opening. Therefore, there is no abnormality of the unit.
• Sound may be heard from the outdoor unit for seconds after running or stopping the compressor, starting or finishing the defrosting, etc. It generates because of the pressure difference inside the piping from the compressor.
  Therefore, there is no abnormality of the unit.

DANGER

Do NOT operate the air conditioners to check the electrical wiring, etc until the preparation of the test run is completed.
NOTE
For further information on function settings, consult the Service Manual for FSXNH series outdoor units.

11.5 TEST RUN CHECK LIST

MODEL:……
SERIAL NUMBER:……………..
COMPRESSOR MFG NUMBER:………
NAME AND CUSTOMER ADDRESS:………
DATE:…….

1. Does the indoor unit fan rotation in the correct direction? __
2. Does the outdoor unit fan rotation in the correct direction? __
3. Can you hear strange noises in the compressor?
4. Has the unit been operating for at least twenty (20) minutes? __
5. Check the temperature of the room:
6. Check the outdoor ambient temperature:
7. Check the temperature of the refrigerant:
8. Check the pressure:
9. Check the voltage:
10. Check the compressor input running current:
11. Is the refrigerant charge OK? __
12. Do the operating control devices work correctly? __
13. Do the safety devices work correctly? __
14. Has the unit been checked for refrigerant leaks? __
15. Is the unit clean inside and outside? __
16. Are all the panels of the unit fastened securely? __
17. Are the panels of the cabinet fastened so that they do not make any noise? __
18. Is the filter clean? __
19. Is the heat exchanger clean? __
20. Are the stop valves open? __
21. Does the water flow freely through the drain hose? __

ALARM CODES

float switch
(high water level in drain pan, abnormality of drain pipe, float switch or drain pan)
2| Outdoor unit| Activation of protection device (high pressure cut)| Activation of PSH (pipe clogging, excessive refrigerant, inert  gas mixing)
3| Transmission| Abnormality between indoor and outdoor| Incorrect wiring, loose terminals, disconnect wire, blowout of fuse, outdoor unit power OFF
4| Abnormality between inverter PCB and outdoor PCB| Inverter PCB – outdoor PCB transmission failure (loose connector, wire breaking, blowout of fuse)
4| Abnormality between fan controller and outdoor PCB| Fan controller – outdoor PCB transmission failure (loose connector, wire breaking, blowout of fuse)
5| Supply phase| Abnormality power source phases| Incorrect power source, connection to reversed phase, open-
phase
6| Voltage| Abnormal inverter voltage| Outdoor voltage drop, insufficient power capacity
6| Abnormal fan controller voltage| Outdoor voltage drop, insufficient power capacity
7| Cycle| Decrease in discharge gas superheat| Excessive refrigerant charge, failure of thermistor, incorrect
wiring, incorrect piping connection, expansion valve locking at opened position (disconnect connector)
8| Increase in discharge gas temperature| Insufficient refrigerant charge, pipe clogging, failure of thermistor, incorrect wiring, incorrect piping connection,
expansion  valve locking at closed position (disconnect connector)
0A| Transmission| Abnormality between outdoor and outdoor| Incorrect wiring, breaking wire, loose terminals
0b| Outdoor unit| Incorrect outdoor unit address setting| Duplication of address setting for outdoor units (sub units) in same refrigerant cycle system
0C| Incorrect outdoor unit main unit setting| Two (or more) outdoor units set as “Main Unit” exist in same refrigerant cycle system
11| Sensor on
indoor unit| Air inlet thermistor| Incorrect wiring, disconnecting wiring breaking wire, short circuit
12| Air outlet thermistor
13| Freeze protection thermistor
14| Gas pipe thermistor
19| Fan motor| Activation of protection device for indoor fan| Fan motor overheat, locking
21| Sensor on
outdoor unit| High pressure sensor| Incorrect wiring, disconnecting wiring breaking wire, short circuit
22| Outdoor air thermistor
23| Discharge gas thermistor at top of compressor
24| Heat exchanger liquid pipe thermistor
25| Heat exchanger gas pipe thermistor
29| Low pressure sensor
31| System| Incorrect capacity setting of outdoor unit and indoor unit| Incorrect capacity code setting of combination excessive or
insufficient indoor unit total capacity code
35| Incorrect setting of indoor unit number| Indoor unit number duplicated in same reference group
36| Incorrect of indoor unit combination| Duplication of indoor unit number in same refrigerant group
38| Abnormality of picking up circuit for protection in outdoor unit| Failure of protection detecting device (incorrect wiring of outdoor PCB)
39| Compressor| Abnormality running current at constant speed compressor| Overcurrent, blowout fuse, current sensor failure, instantaneous
power failure, voltage drop, abnormal power supply
3A| Outdoor unit| Abnormality of outdoor unit capacity| Outdoor unit capacity

54HP
3b| Incorrect setting of outdoor unit models combination or voltage| Incorrect setting of main and sub unit(s) combination or voltage
3d| Abnormality transmission between main unit and sub unit(s)| Incorrect wiring, disconnect wire, breaking wire, PCB failure
43| Protection
device| Activation of low compression ratio protection device| Defective compression (failure of compressor of inverter, loose power supply connection)
44| Activation of low pressure increase protection device| Overload at cooling, high temperature at heating, expansion
valve locking (loose connector)
45| Activation of high pressure increase protection device| Overload operation (clogging, short-pass), pipe clogging, excessive refrigerant, inert gas mixing
47| Activation of low pressure decrease protection device (vacuum operation protection)| Insufficient refrigerant, refrigerant piping, clogging, expansion valve locking at open position (loose connector)
48| Activation of inverter overcurrent protection device| Overload operation, compressor failure
51| Sensor| Abnormal inverter current sensor| Current sensor failure
53| Inverter| Inverter error signal detection| Driver IC error signal detection (protection for overcurrent, low voltage, short circuit)
54| Abnormality of inverter fin temperature| Abnormal inverter fin thermistor, heat exchanger clogging, fan motor failure
55| Inverter| Inverter PCB failure
57| Fan controller| Activation of fan controller protection| Driver IC error signal detection (protection for overcurrent, low voltage, short circuit), instantaneous overcurrent
5A| Abnormality of fan controller fin temperature| Fin thermistor failure, heat exchanger clogging, fan motor failure
5b| Activation of overcurrent protection| Fan motor failure
5C| Abnormality of fan controller sensor| Failure of current sensor (instantaneous overcurrent, increase of fin temperature, low voltage, earth fault, step-out)
EE| Compressor| Compressor protection alarm (it is can not be reset from remote controller)| This alarm code appears when the following alarms occurs
three times within 6 hours. 02, 07, 08, 39, 43 to 45, 47
b1| Outdoor unit
number setting| Incorrect setting of unit and refrigerant cycle number| Over 64 number is set for address or refrigerant cycle
b5| Indoor unit

number setting

| Incorrect indoor unit connection number setting| More than 17 non- corresponding to H-LINK II units are connected to one system
C1| CH unit| Incorrect indoor unit connection| 2 or more CH units are connected between outdoor unit and
indoor unit
C2| Incorrect indoor unit connection number setting| 9 or more indoor units connected to CH unit
C3| Incorrect indoor unit connection| The indoor units of different refrigerant cycle is connected to CH unit

CONTROL AND SAFETY DEVICES

Compressor protection
The compressor is protected by the following devices and their combinations:

1. Pressure switch: this switch stops the compressor when the discharge pressure exceeds the set value.
2. Oil heater: this band-type heater protects against the formation of foam on the oil during cold starts and remains enabled when the compressor is at a standstill.

BASIC TROUBLESHOOTING

CAUTION
If there is a leak in the indoor unit, it smells of smoke or white smoke is coming from the unit, switch off the unit immediately and contact your HITACHI supplier.

SITUATIONS WHICH ARE NOT CONSIDERED AS A FAULT

• Sound of damaged part: when starting or stopping the system, a screeching noise may be heard. This is due to heat deformation of the plastic parts. This is a normal situation.
• Sound of refrigerant flowing: as the system starts or stops, the sound of the refrigerant flowing along the pipes is audible.
• Smells from the indoor unit: smells cling to the indoor unit after a long period of time. Clean the air filter and the panels or allow to ventilate.
• Steam from the outdoor unit heat exchanger: during de-icing, ice on the outdoor unit heat exchanger melts, producing steam.
• Condensation on the air panel: if the system has been operating in cooling mode for a long period of time in high humidity (over 27 °C DB, 80% relative humidity), condensation may form on the air panel.
• Condensation on the cabinet: if the system has been operating in cooling mode for a long period of time in high humidity (over 27 °C DB, 80% relative humidity), condensation may form on the cabinet.

*THE SYSTEM DOESNOT WORK
Check whether the SET TEMPERATURE switch is set to the correct temperature.

FAULTY OPERATION OF THE REFRIGERATION OR HEATING SYSTEM

• Check the outdoor or indoor units for obstructions in the air flow.
• Make sure that there are not too many sources of heat in the room.
• Check that the air filter is not blocked up with dust.
• Check whether or not the doors /windows are open. Check that the temperature is within the working range.

IF THE PROBLEM PERSISTS…

If the problem persists after performing the above checks, please contact your service supply, giving them the following details:

• Name of the model of unit.
• Description of the problem.
• Alarm code number shown on the liquid crystal panel.

NOTE
Keep the main switch of the outdoor unit on (except when the system is not going to be used for a long period of time), as the compressor oil heater deactivates.

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