TOSHIBA RAS-2M10G3AVG-E RAS Multi-split Inverter Outdoor Installation Guide

: June 12, 2024
: Toshiba

Table of Contents

TOSHIBA RAS-2M10G3AVG-E RAS Multi-split Inverter Outdoor
AIR CONDITIONER (MULTI-SPLIT TYPE)
- Installation Manual – Outdoor Unit
Contents
Detailed Product Information
Product Usage Instructions
Installation Manual
Description
Valve cover
Read User Manual Online (PDF format)
Download This Manual (PDF format)

TOSHIBA RAS-2M10G3AVG-E RAS Multi-split Inverter Outdoor

AIR CONDITIONER (MULTI-SPLIT TYPE)

Installation Manual – Outdoor Unit

Model name:	RAS-2M10G3AVG-E RAS-2M14G3AVG-E
Refrigerant Type:	R32
Language:	English

Detailed Product Information

The outdoor unit of the air conditioner is designed for multi-split type installations. The model name of the outdoor unit is RAS-2M10G3AVG-E RAS- 2M14G3AVG-E. It uses R32 refrigerant, which is a flammable refrigerant. The refrigerant type is indicated on the nameplate of the outdoor unit.

Product Usage Instructions

Precautions for safety:
Ensure that children do not play with the appliance. Cleaning and user maintenance should not be carried out by children without supervision.
Warning indications on the air conditioner unit:
Read the OWNER’S MANUAL carefully before operation. Service personnel are required to read the OWNER’S MANUAL and INSTALLATION MANUAL before operation. For more information, refer to the OWNER’S MANUAL, INSTALLATION MANUAL, and similar documents.
Symbols and their meanings:
Follow the precautions provided to avoid safety risks. The symbols indicate= the level of risk associated with incorrect use of the unit. They include DANGER (high possibility of severe injury or death), WARNING (may cause severe injury or death), and CAUTION (may cause personal injury or property damage).
To disconnect the appliance from the main power supply:
This appliance must be connected to the main power supply using a circuit breaker or a switch with a contact separation of at least 3 mm in all poles.
New refrigerant air conditioner installation:
This air conditioner uses the new HFC refrigerant (R32), which does not destroy the ozone layer. However, R32 refrigerant is susceptible to impurities such as water, oxidizing membranes, and oils due to its higher pressure compared to R22 refrigerant.
Requirement of report to the local power supplier:
Before installation, make sure to report the installation of this appliance to the local power supplier. If there are any problems or if the installation is not accepted by the supplier, contact the service agency for appropriate measures.

AIR CONDITIONER (MULTI-SPLIT TYPE)
Installation Manual
Outdoor Unit
Model name:
RAS-2M10G3AVG-E RAS-2M14G3AVG-E

R32

Installation Manual Outdoor Unit

English

Outdoor Unit

Installation Manual

Contents
1 Precautions for safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 2 Installation / service tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3 Speci¿cations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 4 Installation parts, accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 5 Installation of outdoor unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 6 Refrigerant piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 7 Electrical work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 8 Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 9 Test run . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 10 Pump-down Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 11 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 12 Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Please read this Installation Manual carefully before installing the Air Conditioner. · This Manual describes the installation method of the outdoor unit. · For installation of the indoor unit, refer to the Installation Manual attached to the indoor unit.
IMPORTANT NOTICE
For details on how to install the indoor units, refer to the installation manual accompanying the indoor units.

1

Outdoor Unit

Installation Manual

1 Precautions for safety
The manufacturer shall not assume any liability for the damage caused by not observing the description of this manual. Be sure to read this installation manual carefully before installing. The supplied CD-ROM contains the installation manual translated into many languages. Recommend to the owner to perform maintenance periodically when using over long periods of time. This appliance can be used by children aged from 8 years and above and persons with reduced physical, sensory or mental capabilities or lack of experience and knowledge if they have been given supervision or instruction concerning use of the appliance in a safe way and understand the hazards involved.

Children shall not play with the appliance. Cleaning and user maintenance shall not be made by children without supervision.

Warning indications on the air conditioner unit

WARNING (Risk of fire)

This mark is for R32 refrigerant only. Refrigerant type is written on nameplate of outdoor unit. In case that refrigerant type is R32, this unit uses a flammable refrigerant. If refrigerant leaks and comes in contact with fire or heating part, it will create harmful gas and there is risk of fire.

Read the OWNER’S MANUAL carefully before operation.

Service personnel are required to carefully read the OWNER’S MANUAL and INSTALLATION MANUAL before operation.
Further information is available in the OWNER’S MANUAL, INSTALLATION MANUAL, and the like.

Warning indication

Description

CAUTION
BURST HAZARD
Open the service valves before the operation, otherwise there might be the burst.

CAUTION
BURST HAZARD Open the service valves before the operation, otherwise there might be the burst.

2

Outdoor Unit

Installation Manual

Be sure to follow the precautions provided here to avoid safety risks. The symbols and their meanings are shown below.

DANGER WARNING

It indicates that incorrect use of this unit can result in a high possibility of severe injury(*1) or death.
It indicates that incorrect use of this unit may cause severe injury or death.

CAUTION

It indicates that incorrect use of this unit may cause personal injury(2), or property damage(3).

1: A severe injury refers to blindness, injury, burns (hot or cold), electrical shock, bone fracture, or poisoning that leaves after effects and requires hospitalization or extended out-patient treatment.
2: Personal injury means a slight accident, burn, or electrical shock which does not require admission or repeated hospital treatment.
*3: Property damage means greater damage which affects assets or resources.

For general public use
Power supply cord of parts of appliance for outdoor use shall be at least polychloroprene sheathed Àexible cord (design H07RN-F) or cord designation 60245 IEC66 (1.5 mm² or more). (Shall be installed in accordance with national wiring regulations.) This appliance is not intended for use by person (including children) with reduced physical, sensory or mental capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction concerning use of the appliance by a person responsible for their safety. Children should be supervised to ensure that they do not play with the appliance.

CAUTION
To disconnect the appliance from the main power supply This appliance must be connected to the main power supply by means of a circuit breaker or a switch with a contact separation of at least 3 mm in all poles.

CAUTION
NEW REFRIGERANT AIR CONDITIONER INSTALLATION THIS AIR CONDITIONER USES THE NEW HFC REFRIGERANT (R32), WHICH DOES NOT DESTROY THE OZONE LAYER. R32 REFRIGERANT IS APT TO BE AFFECTED BY IMPURITIES SUCH AS WATER, OXIDIZING MEMBRANES, AND OILS BECAUSE THE PRESSURE OF R32 REFRIGERANT IS APPROX. 1.6 TIMES OF REFRIGERANT R22.

3

Outdoor Unit

Installation Manual

CAUTION
AS WELL AS THE ADOPTION OF THIS NEW REFRIGERANT, REFRIGERATING MACHINE OIL HAS ALSO BEEN CHANGED. THEREFORE, DURING INSTALLATION WORK, BE SURE THAT WATER, DUST, FORMER REFRIGERANT, OR REFRIGERATING MACHINE OIL DOES NOT ENTER THE REFRIGERATION CYCLE OF A NEWREFRIGERANT AIR CONDITIONER. TO AVOID MIXING REFRIGERANT AND REFRIGERATING MACHINE OIL, THE SIZES OF CHARGING PORT CONNECTING SECTIONS ON THE MAIN UNIT ARE DIFFERENT FROM THOSE FOR THE CONVENTIONAL REFRIGERANT, AND DIFFERENT SIZE TOOLS ARE ALSO REQUIRED. FOR CONNECTING PIPES, USE NEW AND CLEAN PIPING MATERIALS WITH HIGH PRESSURE WITHSTAND CAPABILITIES, DESIGNED FOR R32 ONLY, AND ENSURE THAT WATER OR DUST DOES NOT ENTER. MOREOVER, DO NOT USE ANY EXISTING PIPING AS ITS PRESSURE WITHSTAND MAY BE INSUFFICIENT AND MAY CONTAIN IMPURITIES.
DANGER
· THE MANUFACTURER SHALL NOT ASSUME ANY LIABILITY FOR THE DAMAGE CAUSED BY NOT OBSERVING THE DESCRIPTION OF THIS MANUAL.
· FOR USE BY QUALIFIED PERSONS ONLY. · MEANS FOR DISCONNECTION FROM THE SUPPLY HAVING A CONTACT
SEPARATION OF AT LEAST 3 MM IN ALL POLES MUST BE INCORPORATED IN THE FIXED WIRING. · TURN OFF MAIN POWER SUPPLY BEFORE ATTEMPTING ANY ELECTRICAL WORK. MAKE SURE ALL POWER SWITCHES ARE OFF. FAILURE TO DO SO MAY CAUSE ELECTRIC SHOCK. · CONNECT THE CONNECTING CABLES CORRECTLY. IF THE CONNECTING CABLES ARE CONNECTED WRONGLY, ELECTRIC PARTS MAY BE DAMAGED. · CHECK THE EARTH WIRE THAT IT IS NOT BROKEN OR DISCONNECTED BEFORE INSTALLATION. · DO NOT INSTALL NEAR CONCENTRATIONS OF COMBUSTIBLE GAS OR GAS VAPORS. FAILURE TO FOLLOW THIS INSTRUCTION CAN RESULT IN FIRE OR EXPLOSION. · TO PREVENT OVERHEATING THE INDOOR UNIT AND CAUSING A FIRE HAZARD, PLACE THE UNIT WELL AWAY (MORE THAN 2 M) FROM HEAT SOURCES SUCH AS RADIATORS, HEATERS, FURNACE, STOVES, ETC. · WHEN MOVING THE AIR CONDITIONER FOR INSTALLING IT IN ANOTHER PLACE AGAIN, BE VERY CAREFUL NOT TO GET THE SPECIFIED REFRIGERANT (R32) WITH ANY OTHER GASEOUS BODY INTO THE REFRIGERATION CYCLE. IF AIR OR ANY OTHER GAS IS MIXED IN THE REFRIGERANT, THE GAS PRESSURE IN THE REFRIGERATION CYCLE BECOMES ABNORMALLY HIGH AND IT RESULTANTLY CAUSES BURST OF THE PIPE AND INJURIES ON PERSONS.

4

Outdoor Unit

Installation Manual

DANGER
· IN THE EVENT THAT THE REFRIGERANT GAS LEAKS OUT OF THE PIPE DURING THE INSTALLATION WORK, IMMEDIATELY LET FRESH AIR INTO THE ROOM. IF THE REFRIGERANT GAS IS HEATED BY FIRE OR SOMETHING ELSE, IT CAUSES GENERATION OF POISONOUS GAS.
· WHEN INSTALLING OR RE-INSTALLING THE AIR CONDITIONER, DO NOT INJECT AIR OR OTHER SUBSTANCES BESIDES THE DESIGNATED REFRIGERANT “R32” INTO THE REFRIGERATING CYCLE. IF AIR OR OTHER SUBSTANCES ARE MIXED, AN ABNORMAL PRESSURE CAN OCCUR IN THE REFRIGERATING CYCLE, AND THIS CAN CAUSE AN INJURY DUE TO A PIPE RUPTURE.
WARNING
About the refrigerant · This product contains Àuorinated greenhouse gases. · Do not vent gases to the atmosphere. · The appliance shall be stored in a room without continuously operating ignition sources
(for example: open Àames, an operating gas appliance or an operating electric heater). · Do not pierce or burn refrigerant cycle parts. · Do not use means to accelerate the defrosting process or to clean, other than those
recommended by the manufacturer. · Be aware that refrigerants may not contain an odour. · The refrigerant inside the unit is Àammable. If the refrigerant leaks in the room and comes
in contact with ¿re from a burner, a heater, or a cooker, it may result in ¿re or the formation of a harmful gas. · Turn off any combustible heating devices, ventilate the room, and contact the dealer from which you purchased the unit. · Do not use the unit until a service person con¿rms that the portion from which the refrigerant leaked is repaired. · When installing, relocating, or servicing the air conditioner, use only the speci¿ed refrigerant (R32) to charge the refrigerant lines. Do not mix it with any other refrigerant and do not allow air to remain in the lines. · Pipe-work shall be protected from physical damage. · Compliance with national gas regulations shall be observed.
WARNING
· Do not use any refrigerant different from the one speci¿ed for complement or replacement. Otherwise, abnormally high pressure may be generated in the refrigeration cycle, which may result in a failure or explosion of the product or an injury to your body.
· Installation work must be requested from the supplying retail dealership or professional vendors. Self-installation may cause water leakage, electrical shock, or ¿re as a result of improper installation.

5

Outdoor Unit

Installation Manual

WARNING
· Speci¿ed tools and pipe parts for model R32 are required, and installation work must be done in accordance with the manual. HFC type refrigerant R32 has 1.6 Times more pressure than that of conventional refrigerant (R22). Use the speci¿ed pipe parts, and ensure correct installation, otherwise damage and/or injury may be caused. At the same time, water leakage, electrical shock, and ¿re may occur.
· Be sure to install the unit in a place which can suf¿ciently bear its weight. If the load bearing of the unit is not enough, or installation of the unit is improper, the unit may fall and result in injury.
· Electrical work must be performed by a quali¿ed electrical engineer in accordance with the code governing such installation work, internal wiring regulations, and the manual. A dedicated circuit and the rated voltage must be used. Insuf¿cient power supply or improper installation may cause electrical shock or ¿re.
· Use a cabtyre cable to connect wires in the indoor/outdoor units. Midway connection, stranded wire, and single-wire connections are not allowed. Improper connection or ¿xing may cause a ¿re.
· Wiring between the indoor unit and outdoor units must be well shaped so that the cover can be ¿rmly placed. Improper cover installation may cause increased heat, ¿re, or electrical shock at the terminal area.
· Be sure to use only approved accessories or the speci¿ed parts. Failure to do so may cause the unit to fall, water leakage, ¿re or electrical shock.
· After the installation work, ensure that there is no leakage of refrigerant gas. If the refrigerant gas leaks out of the pipe into the room and is heated by ¿re or something else from a fan heater, stove or gas range, it causes generation of poisonous gas.
· Make sure the equipment is properly earthed. Do not connect the earth wire to a gas pipe, water pipe, lightning conductor, or telephone earth wire. Improper earth work may be the cause of electrical shock.
· Do not install the unit where Àammable gas may leak. If there is any gas leakage or accumulation around the unit, it can cause a ¿re.
· Do not select a location for installation where there may be excessive water or humidity, such as a bathroom. Deterioration of insulation may cause electrical shock or ¿re.
WARNING
· Installation work must be performed following the instructions in this installation manual. Improper installation may cause water leakage, electrical shock or ¿re. Check the following items before operating the unit. – Be sure that the pipe connection is well placed and there are no leaks. – Check that the service valve is open. If the service valve is closed, it may cause overpressure and result in compressor damage. At the same time, if there is a leak in the connection part, it may cause air suction and overpressure, resulting in burst or injury.

6

Outdoor Unit

Installation Manual

WARNING
· The installation of pipe work shall be kept to a minimum. · The following must be certainly done during pump down.
· Do not incorporate air into the refrigeration cycle. · Close the 2 service valves. Stop the compressor and remove the refrigerant pipe. If the refrigerant pipe is removed when the compressor is operating and service valves are opened, the refrigerant cycle will inhale unwanted matter such as air and the pressure in the cycle becomes abnormally elevated. It may cause a burst or injury. · Do not modify the power cable, connect the cable midway, or use a multiple outlet extension cable. Doing so may cause contact failure, insulation failure, or excess current, resulting in ¿re or electrical shock. · If you detect any damage, do not install the unit. Contact your supplying dealer immediately. · Never modify this unit by removing any of the safety guards or bypassing any of the safety interlock switches. · Do not wash air conditioners with pressure washers. Electric leaks may cause electric shocks or ¿res. · Be sure to comply with local regulations/codes when running the wire from the outdoor unit to the indoor unit. (Size of wire and wiring method etc.) · When installing the air conditioner in a small room, provide appropriate measures to ensure that the concentration of refrigerant leakage occur in the room does not exceed the critical level. It is not dangerous refrigerant; it has not toxicity. However, a concentration above 0.3 kg/m³ as criterion still causes suffocation. The volume of refrigerant charged to the multi system air conditioner is more than the volume charged to a conventional individual system. · Before operating the air conditioner after having completed the work, check that the electrical parts control box cover of the indoor unit and valve cover of the outdoor unit are closed, and set the circuit breaker to the ON position. You may receive an electric shock etc. if the power is turned on without ¿rst conducting these checks. · Make sure drain hose insulation if cooling operation is used at sub-zero ambient temperature.
WARNING
· After installation work, make sure below before operation. – Connection pipes are connected properly and no leakage. – Packed valves are fully open. Running compressor without open packed valves may cause abnormal high pressure and parts failure. Leakage at connection piping may suck air and make further high pressure cause burst and injure.
· During pump down work make sure below process. – Don’t mix air into the refrigerant cycle. – Stop the compressor before removing piping after packed valves are fully closed. Removing piping under the compressor running and packed valves open, air might be sucked and refrigeration cycle pressure becomes abnormally high, and it causes burst or injury on persons.
7

Outdoor Unit

Installation Manual

CAUTION
· Please read this installation manual carefully before installing the unit. It contains further important instructions for proper installation.
· Exposure of unit to water or other moisture before installation could result in electric shock. Do not store it in a wet basement or expose to rain or water.
· After unpacking the unit, examine it carefully for possible damage. · Do not install in a place that can increase the vibration of the unit. Do not install in a place
that can amplify the noise level of the unit or where noise and discharged air might disturb neighbours. · This appliance must be connected to the main power supply by means of a circuit breaker depending on the place where the unit is installed. Failure to do so may cause electrical shock. · Follow the instructions in this installation manual to arrange the drain pipe for proper drainage from the unit. Ensure that drained water is discharged. Improper drainage can result in water leakage, causing water damage to furniture. · Tighten the Àare nut with a torque wrench using the prescribed method. Do not apply excess torque. Otherwise, the nut may crack after a long period of usage and it may cause the leakage of refrigerant. · Wear gloves (heavy gloves such as cotton gloves) for installation work. Failure to do so may cause personal injury when handling parts with sharp edges. · Do not touch the air intake section or the aluminium ¿ns of the outdoor unit. It may cause injury. · Do not install the outdoor unit in a place which can be a nest for small animals. Small animals could enter and contact internal electrical parts, causing a failure or ¿re. · Request the user to keep the place around the unit tidy and clean. · Make sure to conduct a test run after the installation work, and explain how to use and maintain the unit to the customer in accordance with the manual. Ask the customer to keep the operation manual along with the installation manual. · Do not climb onto or place objects on top of the outdoor unit. You may fall or the objects may fall off of the outdoor unit and result in injury.
Requirement of report to the local power supplier
Please make absolutely sure that the installation of this appliance is reported to the local power supplier before installation. If you experience any problems or if the installation is not accepted by the supplier, the service agency will take adequate countermeasures.
Important information regarding the refrigerant used This product contains Àuorinated greenhouse gases. Do not vent gases into the atmosphere. Refrigerant type: R32 GWP(1) value: 675 (ex. R32 ref. AR4) (1)GWP = global warming potential The refrigerant quantity is indicated on the unit name plate. This value is based on F gas regulation 517/2014

8

Outdoor Unit

Installation Manual

2 Installation / service tools

Changes in the product and components In air conditioners using R32, in order to prevent any other refrigerant from being accidentally charged, the service port diameter size of the outdoor unit service valve has been changed. (1/2 UNF 20 threads per inch) In order to increase the pressure resisting strength of the refrigerant piping, flare processing diameter and opposing flare nuts sizes have been changed.
(for copper pipes with nominal dimensions 1/2 and 5/8)

Gauge manifold for R32 Charge hose for R32 Vacuum pump for R32 Gas leakage detector for R32

Phillips screwdriver Level Scale Utility knife

Pipe cutter Torque wrench Wrench (or spanner) Reamer

Flare tool for R32 4 mm hexagonal wrench

3 Specifications

Operating conditions*1 Connecting pipe length

Cooling operation

Dry operation

Heating operation

Minimum for 1 unit

(m)

Maximum for 1 unit

(m)

Maximum for total unit

(m)

Height difference

(m)

No additional refrigerant charge (m)

RAS-2M10G3AVG-E
2 15 20 10 20

10 to 46 °C 10 to 46 °C 20 to 24 °C

RAS-2M14G3AVG-E
2 20 30 10 30

The specifications for performance of this air conditioner differs depending on the combination of the indoor units which are operated. *1 If the air conditioner is used in conditions other than the above, the safety protection functions may be activated.

Example of indoor unit class: RAS-B10J2KVSG-E is abbreviated as “10”.

Indoor unit class

Unit B Unit A
Total

05 or 07 or 10 or 13 05 or 07 or 10 or 13 20 (RAS-2M10G3AVG-E) 26 (RAS- 2M14G3AVG-E)

RAS-2M10G3AVG-E 6.35, 9.52 mm 6.35, 9.52 mm

Standard connecting pipe diameter

RAS-2M14G3AVG-E 6.35, 9.52 mm 6.35, 9.52 mm

—

4 Installation parts, accessories

Installation parts *Locally procured

Parts name Refrigerant piping*2 Putty, PVC tapes

Indoor unit (abbreviation)
05, 07, 10, 13

Specifications Liquid side (O.D.) 6.35 mm —

Gas side (O.D.) 9.52 mm

Q’ty 1 ea. 1 ea.

*2 Refrigerant piping covered with insulating material (Polyethylene foam, 6 mm thick) When duct-type or cassette-type unit is to be installed, it shall be covered with thicker insulating material (Polyethylene foam, 10 mm thick)

Accessories

Installation manual

1

Product specifi cation

1

Rubber cap (Water-proof)

2

CD-ROM

(Installation

1

manual)

F-GAS label

1

Drain nipple

1

9

Outdoor Unit

Installation Manual

600 mm or more 340 mm 320 mm 86 mm 102 mm

5 Installation of outdoor unit
Installation Location
A place which can bear the weight of the outdoor unit and does not cause an increase in noise level and vibration.
A place where the operation noise and air discharge do not disturb neighbours.
A place which is not exposed to strong wind. A place free of combustible gas. A place which does not block a passageway. A place where the drain water does not cause any problems. A place where there are no obstructions near its air intake or air discharge.
Installation in the following places may result in trouble: A place with a lot of machine oil. A place with saline-rich atmosphere such as a coastal area. A place with high level of sulfide gas. A place where high-frequency waves are likely to be generated, such as
from audio equipment, welders, or medical equipment. Do not install the unit in such places.
CAUTION
When the outdoor unit is installed in a place where the drain water might cause any problems, Seal the water leakage point tightly using a silicone adhesive or caulking compound.
Precautions for Installation
When the outdoor unit is to be installed in an elevated position, be sure to secure its feet.
If the outdoor unit is to be mounted on a wall, make sure the base plate supporting it is sturdy enough.
The base plate should be designed and manufactured to maintain its strength over a long period of time, and sufficient consideration should be given to ensure that the outdoor unit will not fall.
When the outdoor unit is installed in a place that is always exposed to strong wind such as a coastal area or on a high story of a building, secure the normal fan operation using a duct or a wind shield.
Especially in windy areas, install the unit in such a way as to prevent the admission of wind.
When the outdoor unit is to be mounted high on a wall, take particular care to ensure that parts do not fall, and that the installer is protected.
When doing installation work at ground level, it is usual to make wiring and pipe connections to the indoor units first, and then to make connections to the outdoor units. However, if outdoor work is difficult, you can change the procedure. For example, by making adjustments to the wiring and piping lengths on the inside (rather than the outside).
When using an air conditioner under low outside temperature conditions (Outside temp: -5 °C or lower) In COOL mode, prepare a duct or wind shield so that it is not affected by the wind.
Necessary Space for Installation
If you need to install the outdoor unit in a location where there are some obstructions or a wall, secure sufficient space as shown in the figure below. The cooling/heating effect may be reduced by 10%.

100 mm or more

Draining Off the Water from the Outdoor Unit
Install 2 waterproof rubber caps and the drain nipple to drain off the water from the outdoor unit. Seal the knock-out holes and screw/thread areas tightly using a silicon
adhesive or a caulking compound. Use a drain pan to apply a centralized drain.

Water-proofing rubber cap Drain nipple

Installation in Regions with Snowfall and Cold Temperatures
Do not use waterproof rubber caps or a drain nipple. If you need to install the outdoor unit in a location where there is a
possibility of the drain freezing, pay close attention so that the drain does not become frozen. To protect the outdoor unit from snow, install the outdoor unit on a holding frame, and attach a snow protection hood and plate. Keep the outdoor unit at least 500 mm above the snow accumulation line.
Snow protection plate

Front

Snow protection hood

Anchor bolts

At least 500 mm Snow accumulation line
Holding frame

Fixing the Outdoor Unit

Fix the outdoor unit using attachment bolts.
Use 8 mm or 10 mm anchor bolts and nuts. Do not allow the attachment bolts to protrude by more than 15 mm. Install the outdoor unit at ground level. Attach the vibration-proof rubber pads under the fixing legs.

108 mm 28 mm

125 mm Air inlet

15 mm or less

Mounting leg

Air outlet 600 mm

90 mm
Drain outlet

GOOD

BAD

Absorb vibration

with vibration-proof

rubber pads

If only the end of

the mounting leg

is supported, it

may deform.

Do not support the outdoor unit only with the mounting leg.

Foundation

Bottom plate of outdoor unit

Foundation

600 mm or more

Foundation
Support the bottom surface of the mounting leg that is in contact with and underneath the bottom plate of the outdoor unit.
10

Outdoor Unit

Installation Manual

6 Refrigerant piping
CAUTION Install in rooms that are 5 m3 or larger. If a leak of refrigerant gas occurs inside the room, an oxygen deficiency may occur.
Detaching the Valve cover
Remove the 3 screws. Pull the valve cover in the direction of the arrow, and remove it.

Pipe connection
1. Make wire and pipe connections for each indoor unit separately. 2. Align the centres of the connecting pipes and tighten the flare nut as much
as possible with your fingers, then tighten the nut using a torque wrench. Be sure to tighten the nut at the specified torque value.
If you use one outdoor unit for several indoor units of a different class, connect the largest one first A, then connect the rest in the order B.
Do not remove the flare nuts for any ports you are not going to use for connection.
Do not leave the flare nut unattached for a long period of time. Use a different-diameter joint if the diameters of the connection port and
connection piping are different. Mount the different-diameter joint on the connection port of the outdoor
unit.

CAUTION

Valve cover

Refrigerant Piping Connection
Flaring 1. Cut the pipe with a pipe cutter.

90°

Obliquity

Roughness Warp

2. Remove the burr inside of the pipe. When removing the burr, be careful so that chips do not fall into the pipe.
3. Remove the flare nuts attached to the outdoor/indoor unit, then insert them into each of the pipes.
4. Flare the pipes. See the following table for the projection margin (A) and flaring size (B)

A

B

Die

Pipe

A

B

Outside diameter

Thickness

Rigid Imperial (clutch (wing type) nut type) R32 tool R32 tool

mm

mm mm

6.35

0.8

0 to 0.5

1.5 to 2.0

9.1

9.52

0.8

0 to 0.5

1.5 to 2.0

13.2

Flare Nut

Width across Tighten torque
flat

mm Nm kgfm

17

14 to 1.4 to 18 1.8

22

33 to 3.3 to 42 4.2

CAUTION
Do not scratch the inner surface of the flared part when removing burrs.
Flare processing under the condition of scratches on the inner surface of flare processing part will cause refrigerant gas leak.

KEEP IMPORTANT 7 POINTS FOR PIPING WORK. (1) Take away dust and moisture (inside of the connecting pipes). (2) Tighten the connections (between pipes and unit). (3) Evacuate the air in the connecting pipes using a VACUUM PUMP. (4) Check gas leak (connected points). (5) Be sure to fully open the packed valves before operation. (6) Reusable mechanical connectors and flared joints are not allowed indoors. When mechanical connectors are reused indoors, sealing parts shall be renewed. When flared joints are reused indoors, the flare part shall be refabricated. (7) Don’t operate air conditioner in case no refrigerant in the system.
Air Purge
From the sake of environmental protection, use a vacuum pump to extract the air during installation. * Prepare a 4 mm hexagon wrench. 1. Connect a charge hose.
Make sure that the Handle Hi of the gauge manifold valve is closed fully. Connect the port of the gauge manifold valve and the service port
(Valve core (Setting Pin)) using the charge hose.
NOTE
If a control valve or charge valve is attached to the charge hose, leak of R32 refrigerant can be avoided.
2. Open the Handle Low of the gauge manifold valve fully, then operate the vacuum pump. Loosen the flare nut of the at the gas end a little to make sure that air is taken in, then tighten the nut. If you find air is not taken in, make sure that the charge hose is connected to the port(s) securely. Perform extraction for about 15 or more minutes and make sure that the compound pressure gauge reading is 101 kPa (76 cmHg). If the compound pressure gauge reading is not 101 kPa (76 cmHg), there is a possibility air is being taken in from the port(s). Make sure that the charge hose is connected to the port(s) securely.
3. Close the Handle Low of the gauge manifold valve fully, then stop operating the vacuum pump. Leave the gauge and pump as they are for 1 or 2 minutes, then make sure that the compound pressure gauge reading stays at 101 kPa (76 cmHg). You need not add refrigerant.

11

Outdoor Unit

Installation Manual

4. Disconnect the charge hose from the service port, then open the valve stem fully using a 4 mm hexagon wrench.

Hexagon wrench is required.

Service port cap

4 mm

Valve stem cap 5. Tighten the service valve stem cap and service port cap securely.
CAUTION Use a torque wrench and tighten the nut at the specified torque value.

6. Tighten all the caps on the valves securely, then perform a gas leak inspection.

Service valve

Type

mm

Liquid side 6.35

Gas side

9.52

Tighten torque

Valve stem cap

Service port cap

1m

kgfm

1m

kgfm

14 to 18 1.4 to 1.8

—

14 to 18 1.4 to 1.8 14 to 18 1.4 to 1.8

Compound pressure gauge 101 kPa (76 cmHg)
Handle Low Charge hose
Service valve at the liquid side
Service valve at the gas side
Service port (Valve core (Setting pin))

Pressure gauge Handle High (Keep full closed) Manifold valve Charge hose
Vacuum pump adapter for preventation
Vacuum pump

Insulation of the Refrigerant Pipes
Insulate the refrigerant pipes for liquid and gas separately.

Heat-proof bubble polyethylene
Gas Leak Inspection
Perform a gas leak inspection for the flare nut connections, valve stem connection, and service port cap without fail.
Use a leak detector exclusively manufactured for R32.

Performing Additional Installation of an Indoor Unit
1. Collect refrigerant from the outdoor unit. 2. Turn off the circuit breaker. 3. Perform additional installation referring to the procedure from “Refrigerant
Piping Connection” on the previous page.
7 Electrical work
WARNING
Be sure to comply with local regulations/ codes when running the wire from the outdoor unit to the indoor unit. (Size of wire and wiring method etc.)
A lack of electrical capacitance or incorrect wiring may cause an electric shock or a fire.
To make sure that the wiring connection are secure, use designated cables.
Fix the cables securely so that no external force applied to the cables may effect the terminals.
If wiring connections are incomplete or cables are not fixed securely, it may cause a fire.
Be sure to ground the outdoor unit. Incomplete grounding may lead to an
electric shock.
CAUTION
Incorrect/incomplete wiring will cause electrical fires or smoke.
Prepare the power source for exclusive use with the air conditioner.
This product can be connected to the main power. Fixed wire connections: A switch that disconnects all poles and has a contact separation of at least 3 mm must be incorporated into the fixed wiring.

Flare nut connections (Indoor unit)
Service port cap connection Valve stem cap connection

Check point example

Flare nut connections (Outdoor unit)

12

Outdoor Unit

Installation Manual

Wire Connection

The dash lines show on-site wiring. For indoor unit RAS-M series.

(Main circuit)

(System interconnection wires)

Input power

L

1

N

2

3

2

3

Remote controller

Leakage breaker

Earth

Indoor unit

For indoor unit RAS-B series.

Input power

(Main circuit)
L N

Leakage breaker

Earth

(System interconnection wires)

2

3

Remote controller

Indoor unit

Connect the indoor/outdoor connecting cables to the identical terminal numbers on the terminal block of each unit.
Incorrect connection may cause a failure.

Model
Power supply Maximum running current Circuit breaker rating
Power cord
Connecting cable

RAS-2M10G3AVG-E

RAS-2M14G3AVG-E

1ph, 50Hz, 220-240V

9.50A

10.50A

15A
H07RN-F or 60245 IEC 66 3-core 1.5 mm²
H07RN-F or 60245 IEC 66 4-core 0.75 mm²

1. Remove the valve cover screws. 2. Pull the valve cover in the direction of arrow, and remove it. 3. Remove the cord clamp.

Valve cover

Stripping Length of connecting cable for outdoor unit

1(L) 2 3

LN

5

55

30

5 55

Earth wire

Connecting cable

Power cord

Earth wire (Unit : mm)

Power supply
Earth screw Connecting cable
Unit A

Earth screw
Connecting cable Unit B

8 Grounding
This air conditioner must be grounded without fail. Grounding is necessary not only to safeguard against the possibility
of receiving an electric shock but also to absorb both static, which is generated by high frequencies and held in the surface of the outdoor unit, and noise since the air conditioner incorporates a frequency conversion device (called an inverter) in the outdoor unit. If the air conditioner is not grounded, users may receive an electric shock if they touch the surface of the outdoor unit and that unit is charged with static.
9 Test run
Wiring/Piping Check
CAUTION
Electric current is applied on the control board. Beware of electric shock.
1. Remove the cabinet (up) screws. 2. Pull the cabinet (up) in the direction of arrow, and remove it.

Cord clamp
4. Connect the wires for the power source and each indoor unit. Connect the connecting cable to the terminal as identified by the matching numbers on the terminal block of the indoor and the outdoor unit.
5. Fix the wiring connections for the power source and each indoor unit securely using a cord clamp.
6. Attach the terminal cover.

Valve cover

LED Service switches

D801 D803 D805

SW02

D800 D802 D804

SW01

13

Outdoor Unit

Installation Manual

3. Turn on the circuit breaker to supply electricity. In the initial LED display status, D805 is lighted as below.

{ : ON, z : OFF, : Rapid Flashing (5 times/sec.), : Slow Flashing (1 time/sec.)

D800 z

D801 z

D802 z

D803 z

D804 z

D805 {

Start running all the indoor units connected to the outdoor unit in the cooling mode. (The indoor unit in the room that doesn’t operate the cooling mode cannot be checked.)

4. After 5 minutes, hold down SW01 for at least 5 seconds, and check that D800 is lighted and D804 light is flashing (1 time/sec.).

D800 {

D801 z

D802 z

D803 z

D804

D805 z

5. Press the SW01 4 times until the LED is displayed as below.

D800 z

D801 z

D802 {

D803 z

D804

D805 z

6. Press SW02 for 1 times. Then D805 light is flashing (5 times/sec.).

D800 z

D801 z

D802 {

D803 z

D804

D805

7. Hold down SW02 for at least 5 seconds. Then the wiring/piping check starts automatically. (The LED display is lighted for a moment.)

D800 z

D801 z

D802 {

D803 z

D804

D805 {

If no problems are detected, the checking operation returns to the normal operation automatically. The LED is displayed as below.

D800 z

D801 z

D802 z

D803 z

D804 z

D805 {

8. The below is displayed when the error is detected. (* Repetition of 3 sec ON / 0.5 sec OFF)

D800 {*

D801 {*

D802 {*

D803 {*

D804 {*

D805 {

Press the SW01 3 times until the LED is displayed as below, to check the room judged as error.

D800 z

D801 {

D802 z

D803 z

D804 z

D805

Incorrect wiring/piping can be checked by pressing SW02. The LED is displayed as below. Turn off the circuit breaker, then check wiring/piping again.

Check result

D800 z { z {

D801 z z { {

D802 z z z z

D803 z z z z

D804 z z z z

D805

Description Normal operation (no error) Trouble in unit A Trouble in unit B Trouble in unit A and B

The D800 LED represents unit A. The D801 LED represents unit B.
9. When you want to start over the operation of the SW01 and SW02, press the SW01 and the SW02 at the same time for 5 sec. (The procedure will set back to step 3.) However, do not execute the operation during the check. If by any chance the check is stopped by the operation, start over the check after turning off the power once.

10. Notes
It sometimes takes about 30 minutes maximum for the check. During the check, the compressor and the fan of the outdoor/indoor unit
repeat ON/OFF. You cannot check wiring/piping when the external temperature is 5°C
or less. Also, there is a possibility to misjudge if the indoor temperature becomes too low by cooling operation. In that case, execute the cooling operation for per room and check if the connection is normal.

Gas Leak Inspection
Refer to the ” Gas Leak Inspection” on page 12.
Test run
1. If you perform the test run in summer, start running in the cooling mode first to decrease the temperature of the room, then run in the heating mode. (Heating mode: Set the temperature to 30°C.) If you perform the test run in winter, start running in the heating mode first to increase the temperature of the room, then run in the cooling mode. (Cooling mode: Set the temperature to 17°C.)
2. For the test run, be sure to satisfy the following conditions below: – Perform the test run for each indoor unit respectively. – Perform the test run for about 10 minutes in both the cooling mode and the heating mode. You can perform the test run in the cooling/heating mode by utilizing the thermo sensor of the indoor unit. Cooling mode: Warm the thermo sensor using an appliance such as a hair dryer. Heating mode: Put a cold towel on the thermo sensor.
Instructions for the Customers
Explain to the customers the proper operation procedure and let them operate the air conditioner along with the supplied instruction manual.
When multiple indoor units are connected to the outdoor unit, the cooling mode and the heating mode are not available at the same time. When multiple indoor units are running at the same time, the operation mode of the unit which starts running first is applied to the other units.
When you start running the indoor unit or change the operation mode, the unit starts running after 3 minutes. This is due to the protection function of the unit, not a malfunction.
When the external temperature becomes low, the pre-heating of the compressor starts to protect it. Keep the circuit breaker on for use. The electricity consumption during pre-heating is about 30 W. If the circuit breaker is turned off, the indoor unit may not start running for about 10 minutes or more.
Electronic expansion valves are used for the outdoor unit. When you turn on the power, the outdoor unit starts clattering every 1 or 2 months. This clattering is not a malfunction, but occurs when the unit is returning to the default setting for optimised control.
While an indoor unit is running in the heating mode, the outdoor unit supplies refrigerant to the other indoor units which are not running. Therefore, noise may come from the other indoor units or the exterior of them may become warm.

14

Outdoor Unit

Installation Manual

10 Pump-down Operation
Pump-down Operation (Recovering refrigerant)
CAUTION
Since the forcible running for collecting refrigerant stops automatically after 10 minutes, finish collecting refrigerant within 10 minutes.
Electric current is applied on the control board. Beware of electric shock.
The following must be certainly done during pump down. Do not incorporate air into the refrigeration cycle. Close the service valves. Stop the compressor and remove the refrigerant pipe. If the refrigerant pipe is removed when the compressor is operating and service valves are opened, the refrigerant cycle will inhale unwanted matter such as air and the pressure in the cycle becomes abnormally elevated. It may cause a burst or injury.
1. Remove the cabinet (up) screws. 2. Pull the cabinet (up) in the direction of arrow, and remove it.

Valve cover

LED Service switches

D801 D803 D805

SW02

D800 D802 D804

SW01

3. Turn on the circuit breaker to supply electricity. In the initial LED display status, D805 is lighted as below.

{ : ON, z : OFF, : Rapid Flashing (5 times/sec.), : Slow Flashing (1 time/sec.)

D800 z

D801 z

D802 z

D803 z

D804 z

D805 {

Start running all the indoor units connected to the outdoor unit in the cooling mode. The checking procedure cannot be completed if the cooling mode is not operated in every indoor units.

4. Hold down SW01 for at least 5 seconds, and check that D800 is lighted and D804 light is flashing (1 time/sec.).

D800 {

D801 z

D802 z

D803 z

D804

D805 z

5. Press SW01 for 1 time. Then D804 light is flashing (5 times/sec.).

D800 {

D801 z

D802 z

D803 z

D804

D805 z

6. Press SW02 for 1 time. Then D805 light is flashing (5 times/sec.).

D800 {

D801 z

D802 z

D803 z

D804

D805

7. Hold down SW02 for at least 5 seconds. Then outdoor unit start cooling mode. (The display is kept during the refrigerants collection operation.)

D800 {

D801 z

D802 z

D803 z

D804

D805 {

8. Close the valve stem of the service valve at the liquid end. 9. Make sure that the compound pressure gauge reading is 101 kPa
(76 cmHg) 10. Close the valve stem of the service valve at the gas end. 11. The refrigerants collection operation is finished in maximum 10 minutes.
After the collection is finished, promptly stop the operation of all the indoor unit. (There are cases that the compressor restarts.) 12. When you want to start over the operation of the SW01 and SW02, press the SW01 and SW02 at the same time for 5 sec. (It back to the initial condition of 3.) However, do not execute the operation during the refrigerants collection. If by any chance the collection is stopped by the operation, start over the refrigerants collection operation.

11 Troubleshooting
You can perform fault diagnosis of the outdoor unit with the LEDs on the P.C. board of the outdoor unit in addition to using the check codes displayed on the remote controller of the indoor unit. Use the LEDs and check codes for various checks. Details of the check codes displayed on the remote controller of the indoor unit are described in the Installation Manual of the indoor unit.

LED displays and check codes { : ON ({* : 3 sec ON/0.5 sec OFF), z : OFF

Display D800 D801 D802 D803 D804 D805 (YL) (YL) (YL) (YL) (YL) (GN)
zzzzz { z z z z z { z z z { { z z z z z { z z { z { z z z { { z z { { { z z z z z { z { z z { z z { z { z { { z { z
z z { { z
{ z { { z {
z { { { z
{ { { { z
z z z z {
{ z z z {
z { z z {
{ z { z { z { { z { z z z { { { z z { { z { z { { { z { { {*

Indoor check code
1C 21 1C 1D 1F 14 16 17 1C 1A 1E
19
1B
18
18
1C
1C
1C
20 20 20 –

Description
Normal operation (no error) Compressor case thermostat error High pressure switch error Compressor system error Compressor lock Compressor breakdown Driving element short circuit Position detection circuit error Current detection circuit error Communication error between MCU Fan system error Discharge temperature error Discharge temperature sensor (TD) error Outdoor air temperature sensor (TO) error Suction temperature sensor (TS) error Heat exchanger temperature sensor (TE) error Gas pipe (unit A) temperature sensor (TGa) error Gas pipe (unit B) temperature sensor (TGb) error Gas pipe (unit C) temperature sensor (TGc) error PMV error (SH20) PMV error (SH8) PMV leakage error (unit A) PMV leakage error (unit B) PMV leakage error (unit C) Miswiring (mispiping) check error

15

16

12 Appendix
Work instructions
The existing R22 and R410A piping can be reused for inverter R32 product installations.
WARNING
Con¿rming the existence of scratches or dents on the existing pipes and con¿rming the reliability of the pipe strength are conventionally referred to the local site. If the speci¿ed conditions can be cleared, it is possible to update existing R22 and R410A pipes to those for R32 models.

Basic conditions needed to reuse existing pipes
Check and observe the presence of three conditions in the refrigerant piping works. 1. Dry (There is no moisture inside of the pipes.) 2. Clean (There is no dust inside of the pipes.) 3. Tight (There are no refrigerant leaks.)

Restrictions for use of existing pipes

In the following cases, the existing pipes should not be reused as they are. Clean the existing pipes or exchange them with new pipes. 1. When a scratch or dent is heavy, be sure to use
new pipes for the refrigerant piping works. 2. When the existing pipe thickness is thinner than the
speci¿ed “Pipe diameter and thickness,” be sure to use new pipes for the refrigerant piping works.
· The operating pressure of R32 is high (1.6 times that of R22). If there is a scratch or dent on the pipe or a thinner pipe is used, the pressure strength may be inadequate, which may cause the pipe to break in the worst case.

Pipe diameter and thickness (mm)

Pipe outer diameter

Ø6.4 Ø9.5 Ø12.7

R32, R410A

Thickness

0.8 0.8 0.8

R22

3. When the outdoor unit was left with the pipes disconnected, or the gas leaked from the pipes and the pipes were not repaired and re¿lled. · There is the possibility of rain water or air, including moisture, entering the pipe.
4. When refrigerant cannot be recovered using a refrigerant recovery unit.
· There is the possibility that a large quantity of dirty oil or moisture remains inside the pipes.
5. When a commercially available dryer is attached to the existing pipes.
· There is the possibility that copper green rust has been generated.

6. When the existing air conditioner is removed after refrigerant has been recovered. Check if the oil is judged to be clearly different from normal oil.
· The refrigerator oil is copper rust green in color: There is the possibility that moisture has mixed with the oil and rust has been generated inside the pipe.
· There is discolored oil, a large quantity of residue, or a bad smell.
· A large quantity of shiny metal dust or other wear residue can be seen in the refrigerant oil.
7. When the air conditioner has a history of the compressor failing and being replaced.
· When discolored oil, a large quantity of residue, shiny metal dust, or other wear residue or mixture of foreign matter is observed, trouble will occur.
8. When temporary installation and removal of the air conditioner are repeated such as when leased etc.
9. If the type of refrigerator oil of the existing air conditioner is other than the following oil (Mineral oil), Suniso, Freol-S, MS (Synthetic oil), alkyl benzene (HAB, Barrel-freeze), ester series, PVE only of ether series.
· The winding-insulation of the compressor may deteriorate.
10. When total pipe length is longer than the maximum length for total unit, speci¿ed in clause 3, be sure to use new pipes for the refrigerant piping works.

NOTE
The above descriptions are results have been con¿rmed by our company and represent our views on our air conditioners, but do not guarantee the use of the existing pipes of air conditioners that have adopted R32 in other companies.

Curing of pipes

When removing and opening the indoor or outdoor unit for a long time, cure the pipes as follows: · Otherwise rust may be generated when moisture
or foreign matter due to condensation enters the pipes. · The rust cannot be removed by cleaning, and new pipes are necessary.

Placement location
Outdoors
Indoors

Term
1 month or more Less than 1 month
Every time

Curing manner Pinching
Pinching or taping

YES Are there scratches or dents on the existing pipes?
NO NO
Is it possible to operate the existing air conditioner?

Existing pipes: Cannot be used. · Use new pipes.

YES
· After the existing air conditioner is operated in cooling mode for approx. 30 minutes or longer,* recover the refrigerant.
· For cleaning the pipes and recovering oil · Refrigerant recovery: Pump down method

Nitrogen gas pressure 0.5 MPa

· Remove the existing air conditioner from the piping and carry out Àushing (nitrogen pressure 0.5 MPa) to remove any remains inside of the pipe.
Was largely discolored oil or a large quantity of remains discharged? (When the oil
deteriorates, the color of the oil changes to a muddy or black color.) NO
Connect the indoor / outdoor units to the existing pipe. · Use a Àare nut attached to the main unit for the
indoor / outdoor units. (Do not use the Àare nut of the existing pipe.) · Re- machine the Àare machining size to size for R32.
· (Airtight test), Vacuum dry, Refrigerant charge, Gas leak check
Test run

(If there is discharge of remains, it is judged that a large quantity of remains are present.)
YES Clean the pipes or use new pipes.

Piping necessary to change the Àare nut / machining size due to pipe compression