HITACHI RAM-E53N2HAE Split Unit Air Conditioner Installation Guide

: August 14, 2024
: Hitachi

Table of Contents

RAM-E53N2HAE Split Unit Air Conditioner
SAFETY PRECAUTION
OUTDOOR UNIT
Preparation of Pipe
Pipe Connection
Removal Of Air From The Pipe And Gas Leakage Inspection
CONNECTION OF POWER CORD
FINAL STAGE OF INST ALLATION
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INSTALLATION
MANUAL
SPLIT UNIT AIR CONDITIONER
air Home Multi
OUTDOOR UNIT
RAM-E53N2HAE
HFC R32
INSTRUCTION MANUAL

RAM-E53N2HAE Split Unit Air Conditioner

FOR SERVICE
PERSONNEL ONLY

Carefully read through the procedures of proper installation before starting installation work.
The sales agent should inform customers regarding the correct operation of installation.

Tools Needed For Installation Work

( mark is tool exclusive use for R32)

Screwdriver
Measuring Tape
Knife
Saw
Pipe Cutter
Hexagonal Wrench Key ( 4mm)
Power Drill (ø 65mm ~ ø 80mm)
Vacuum Pump
Pliers or Wrench
Torque Wrench
Vacuum Pump Adaptor
Flare Tool
Gas Leakage Detector
Manifold Valve
Charge Hose
Reamer
File

WARNING!

Flare nut must use a torque wrench without fail. Tighten with the speciﬁ ed tightening torque. If the ﬂ are nut is tightened too much, after a long period of time, the ﬂ are nut breaks, Gas leakage, stagnation, touching ﬁ re, rarely cause ignition.
Sharp bending of the pipe use the polyethylene rod, bend not crushed the pipe. Gas leakage from the crushed part, stagnation, touching ﬁ re, rarely cause ignition.
Please request your sales agent or qualiﬁ ed technician to install your unit. Water leakage, short circuit or ﬁ re may occur if you do the installation work yourself.
Please observe the instructions stated in the installation manual during the process of installation. Improper installation may cause water leakage, electric shock and ﬁ re.
A brazed, welded, or mechanical connection shall be made before opening the valves to permit refrigerant to ﬂ ow between the refrigerating system parts. A vacuum valve shall be provided to evacuate the interconnecting pipe and/or any uncharged refrigerating system part.
Mechanical connectors used indoors shall comply with ISO 14903. When mechanical connectors are reused indoors, sealing parts shall be renewed. When ﬂ ared joints are reused indoors, the ﬂ are part shall be re-fabricated.
Refrigerant tubing shall be protected or enclosed to avoid damage.
Make sure that the units are mounted at locations which are able to provide full support to the weight of the units. If not, the units may collapse and impose danger.
Observe the rules and regulations of the electrical installation and the methods described in the installation manual when dealing with the electrical work. Use power cables approved by the authorities of your country.
Be sure to use the speciﬁ ed wire for connecting the indoor and outdoor units. Please ensure that the connections are tight after the conductors of the wire are inserted into the terminals. Improper insertion and loose contact may cause over-heating and ﬁ re.
Please use the speciﬁ ed components for installation work. Otherwise, the units may collapse or water leakage, electric shock and ﬁ re may occur.
Be sure to use the speciﬁ ed piping set for R32. Otherwise, this may result in broken copper pipes or faults.
When installing or removing an air conditioner, only speciﬁ ed refrigerant (R32) shall be allowed, do not allow air or moisture to remain in the refrigeration cycle. Otherwise, pressure in the refrigeration cycle may become abnormally high so that a rupture may be caused.
Be sure to ventilate fully if a refrigerant gas leak while at work. If the refrigerant gas comes into contact with ﬁ re, a poisonous gas may occur. Be aware that refrigerants may not contain an odour.
After completion of installation work, check to make sure that there is no refrigeration gas leakage. If the refrigerant gas leaks into the room, coming into contact with ﬁ re in the fan-driven heater, space heater, etc., a poisonous gas may occur.
Unauthorized modiﬁ cations to the air conditioner may be dangerous. If a breakdown occurs please call a qualiﬁ ed air conditioner technician or electrician. Improper repairs may result in water leakage, electric shock and ﬁ re, etc.

SAFETY PRECAUTION

Read the safety precautions carefully before operating the unit.
The contents of this section are vital to ensure safety. Please pay special attention to the following sign.
WARNING …….. Incorrect methods of installation may cause death or serious injury.
CAUTION ……… Improper installation may result in serious consequence.

Be sure that the unit operates in proper condition after installation. Explain to customer the proper way of operating the unit as described in the user’s guide.

https://docs.hitachiaircon.com/RAM-E-N-HAE

Access the full version of the User Installation Manual by scanning the code.

CAUTION!

A circuit breaker or fuse must be installed. Without a circuit breaker or fuse the danger of electric shock exists.
The external switch shall be incorporated to completely disconnect from power supply. It should disconnect all poles, and a contact separation of at least 3mm must be present.
Do not install the unit near a location where there is ﬂammable gas. The outdoor unit may catch ﬁre if ﬂammable gas leaks around it.
Do not install the indoor unit in a machine shop or kitchen where vapor from oil or its mist ﬂows to the indoor unit. The oil will deposit on the heat exchanger, thereby reducing the indoor unit performance and may deform and in the worst case, break the plastic parts of the indoor unit.
Please ensure smooth ﬂ ow of water when installing the drain hose.
Piping shall be suitable supported with a maximum spacing of 1m between the supports.

WARNING!

Do not use means to accelerate the defrosting process or to clean, other than those recommended by the manufacturer. Anyunﬁt method or using incompatible material may cause product damage, burst and serious injury.
The appliance/pipe-work shall be stored in a well ventilated room with indoor ﬂoor area larger than Amin [refer to Table 1] and without any continuously operating ignition source. Keep away from open ﬂames, any operating gas appliances or any operating electric heater. Else, it may explode and cause injury or death.
The appliance/pipe-work shall be installed, and/or operated in a room with ﬂoor area larger than Amin [refer to
Table 1] and keep away from ignition sources, such as heat/spark/open ﬂame or hazardous areas such as gas appliances, gas cooking, reticulated gas supply systems or electric cooking appliances, etc.
Do not pierce or burn as the appliance/pipe-work is pressurized. Do not expose the appliance/pipe-work to heat, ﬂame, sparks, or other sources of ignition. Else, it may explode and cause injury or death.

Proper place for installation
1.1 Outdoor unit
(1) Keep the space around the unit for maintenance and avoiding the effects of hindrance for normal ventilation of the unit.
(2) The northern or eastern side of the building is better to install. At the installation on the southern or western side unavoidably, some blind should be set up for the unit. (In this case, the blind must not obstruct the ventilation of the unit.)
(3) You’d better not put the unit at a place where is full of dirt and at a place where is wet in the rain.
(4) Place as near as possible to the indoor unit.
(5) Install the unit in a stable place to minimize vibration or noise.
(6) After arranging the cords and pipes, secure them in place.
WARNING!
● This appliance must be earthed.
● Power is supplied through outdoor unit, do not connect power source to indoor unit.
In the electrical installation a separator with a contact gap of more than 3mm has to be installed. During cleaning or service the set has to be switched off with this separator.

The Choice of Mounting Site (Please note the following matters and obtain permission from customer before installation).

OUTDOOR UNIT

WARNING!

The Outdoor unit must be mounted at a location which can supportheavy weight. Otherwise, noise and vibration will increase.

CAUTION!

Do not expose the unit under direct sunshine or rain. Besides, ventilation must be good and clear of obstruction.
The air blown out of the unit should not point directly to animals or plants.
The clearances of the unit from top, left, right and front are speciﬁ ed in ﬁ gure below. At least 3 of the above sides must be open air.
Be sure that the hot air blown out of the unit and noise do not disturb the neighbourhood.
Do not install at a location where there is ﬂ ammable gas, steam, oil and smoke.
The location must be convenient for water drainage.
Place the Outdoor unit and its connecting cord at least 1m away from the antenna or signal line of television, radio or telephone.
This is to avoid noise interference.
Do not install outdoor unit facing strong wind direction. It may damage the fan motor.
Do not install the outdoor unit in a place where small animals may build their nests. If small animal goes inside the unit and touches the electrical parts, failure of the unit, smoke or ﬁ re may be caused. Request your customer to keep the surrounding of the unit is clean.

Names of Outdoor Components

No.	Item	Qty
1	Bush	3
2	Drain Pipe	1
3	Bush	1

Dimension of Mounting Stand of the Outdoor unit

Figure showing the Installation of Outdoor Unit.
CAUTION

This unit is chargeless up 35m pipe length.
Installation of pipe length less than minimum pipe length requirement (3 meters) may generate an abnormal sound.

WARNING
This symbol shows that this equipment uses aﬂammable refrigerant.
If the refrigerant is leaked, together with an external ignition source, there is a possibility of ignition.
CAUTION
This symbol shows that the Operation Instructions should be read carefully.
CAUTION
This symbol shows that a service personnel should be handling this equipment with reference to the Installation Manual.
CAUTION
This symbol shows that there is information included in the Operation Manual and/or Installation Manual

WARNING
BURST HAZARD
Do not allow air, etc. to get into refrigerant cycle (piping)
RISK OF EXPLOSION
Compressor must be stopped before removing refrigerant pipes.
All service valve must be fully closed after pumping down operation.

Height difference

Height difference between indoor units should not be more than 5m.

Piping length

Minimum piping length for each indoor unit is 3m.
Maximum piping length for one indoor unit is 25m.
Additional charge of refrigerant is not required.

To the outdoor unit, up to two indoor units can be connected until the total value of each units’ scapacity reaches 8.5 kW.
The pipe connection ports of the outdoor unit and connectable indoor units are shown above.

CAUTION

Make sure to connect to two indoor units.

Flare adaptor for piping

The ﬂ are adaptor for piping is required depending on combination of indoor units.

ø9.52 (3/8”) ➝ ø 12.7 (1/2”)
Parts number TA261D-4 001
ø12.7(1/2”) ➝ ø 9.52 (3/8”)
Parts number TA261D-6 002
Please mount the Outdoor unit on stable ground to prevent vibration and increase of noise level.
Decide the location for piping after sorting out the different types of pipe available.
When removing side cover, please pull the handle after undoing the hook by pulling it downward.

CONDENSED WATER DISPOSAL OF OUTDOOR UNIT

There are holes on the base of Outdoor unit for condensed water to exhaust.
In order to ﬂ ow condensed water to the drain, the unit is installed on a stand or a block so that the unit is 100mm above the ground as shown ﬁ gure. Join the drain pipe to one hole.
At ﬁ rst insert one portion of the hook to the base (Portion A), then pull the drain pipe in the direction shown by the arrow while inserting the hook into the base. After installation, check whether the drain pipe cling to the base ﬁ rmly.

When Using and Installing In Cold Areas
When the air conditioner is used in low temperature and in snowy conditions, water from the heat exchanger may freeze on the base surface to cause poor drainage. When using the air conditioner in such areas, do not install the bushings. Keep a minimum of 250mm between the drain hole and the ground. When using the drain pipe, consult your sales agent.
For more details, refer to the installation Manual for Cold Areas.

INST ALLA TION OF REFRIGERA TING PIPES AND AIR REMOVAL

Preparation of Pipe

Use a pipe cutter to cut the copper pipe.

CAUTION!

Jagged edge will cause leakage.
Point the side to be trimmed downwards during trimming to prevent copper chips from entering the pipe.
Before ﬂaring, please put on the ﬂare nut.
Recommend to use R32 ﬂaring tool.
Outer Diameter mm (inch)| Thickness (mm)| A (mm)
---|---|---
Flare tool for R32
Clutch type| Conventional flare tool
Clutch type| Wing nut type
6.35(1/4″)| 0.8| 0.0 ^, 0.5| 1.0 — 1.5| 1.5 — 2.0
9.52 (3/8″)| 0.8| 0.0 ^, 0.5| 1.0 — 1.5| 1.5 —, 2.0
12.70 (1/2″)| 0.8| 0.0 ^, 0.5| 1.0 — 1.5| 1.5 —, 2.5

Pipe Connection

CAUTION
In case of removing ﬂ are nut of an Indoor unit, ﬁrst remove a nut of small diameter side, or a seal cap of big diameter side will ﬂ y out. Prevent water from entering into the piping when working.

| Outer
dia.of pipe| Torque N.m (kgf cm)
---|---|---
Small dia. side| 6.35 (1/4″)| 14.0 — 18.0 (140 — 180)
Large dia. side| 9.52 (3/8″)
12.70 0/21| 33.0 — 42.0 (330 — 420)
50.0 — 62.0 (500 r’ 620)
Valve head cap| Small dia. side| 6.35 (1/4″)| 19.6 — 24.5 (200 — 250)
Large dia. side| 912.527 (31//82111))| 2199.. 34.3 64 — 24.5 (200 — 250)
(300 — 350)
Valve core cap| 12.3 — 15.7 (125 — 160)
Spindle| Small dia. side| 6. 6.35 (1/4″)
9.52 (3/8″)| 3.92-5.88 (4060)
Large dia. side| 12.7 (1/2″)
12. 15.87 (5/8″)| 9.80-10.78 (100110)

Removal Of Air From The Pipe And Gas Leakage Inspection

AIR REMOVAL

Procedures of using Vacuum Pump for Air Removal

As shown in right ﬁ gure, remove the cap of valve core. Then, connect the charge hose.
Remove the cap of valve head. Connect the vacuum pump adapter to the vacuum pump and connect the charge hose to the adapter.
Fully tighten the “Hi” knob of the manifold valve and completely unscrew the “Lo” knob.
Run the vacuum pump for about 10~15 minutes, then completely tighten the “Lo” knob and switch off the vacuum pump.
Remove the charge hose and tighten the cap of valve core. Check the cap’s periphery if there is any gas leakage.
Completely unscrew the spindle of the service valve in anti-clockwise direction to allow the ﬂ ow of refrigerant (using Hexagonal Wrench key). Then, slightly halfturn in reverse rotation to avoid seal inside broken.
Re-cap the service valve and tighten using wrench. Check the cap’s periphery if there is any gas leakage. The task is then completed.

CAUTION!

Prevent moisture from entering pipe connection.
Refrigerating machine oil not be applied to the outside of the ﬂ are.
When refrigerating machine oil is applied to the outside of the ﬂ are, excessive tightening of the ﬂ are nut, cracking of the ﬂare nut, destruction of the ﬂare and gas leakage may occur.
When using the control valve, do not use deteriorated packing. And, do not overtighten the steering wheel.
Gas leakage from the service valve part, stagnation, touching ﬁ re, rarely cause ignition.

Gas Leakage Inspection

Please use gas leakage detector to check if leakage occurs at the connection of Flare nut as shown on the right.
If gas leakage occurs, further tighten the connection to stop leakage. (Be sure to use R32 detector)

CONNECTION OF POWER CORD

WARNING

THIS APPLIANCE MUST BE EARTHED.

Procedures of Wiring

Installation procedure and notice
Especially, the selection of installation place need great care for the split type air conditioner, because it is very difﬁ cult to move from place to place after the ﬁ rst installation.

1.1 Wiring

Connect the electrical wiring between the Indoor and Outdoor unit, as shown in Fig. 1-1. Never connect the wiring by mistake.
In case of wrong connection, the unit does not operate properly and it may cause malfunction.
The connecting cord must be ﬁ xed by the band which is located near the terminal board.

1.2 Connection of the connecting cords and power cord

Cut off the connecting cord, the power cord and strip the insulation of the wire, as shown in Fig. 1-2.
Connect the connecting cord and power cord to the terminal board. (Fig. 1-3)
Fix the connecting cords and power cord with steel band certainly. (Fig. 1-3)

Detail of Cutting the Connecting Cord

Indoor earth wire connection to outdoor

Method 1 (Separate)	Method 2 (Combine)
Screw for ground at outdoor unit

Both method of earth wire connection are acceptable.
Please ensure the wire ﬁ xed ﬁ rmly to the screw.

WARNING!

Leave some space in the connecting cord for maintenance purpose and be sure to secure it with the cord band.
Secure the connecting cord along the coated part of the wire using the cord band. Do not exert pressure on the wire as this may cause overheating or ﬁre.

WARNING!

The naked part of the wire core should be 10 mm and ﬁ x it to the terminal tightly. Then try to pull the individual wire to check if the contact is tight. Improper insertion may burn the terminal.
Be sure to use only wire speciﬁ ed for the use of air-conditioner.
Please refer to the manual for wire connection and the wiring technique should meet the standard of the electrical installation.
There is an AC voltage drop between the LN terminal if the power is on. Therefore, be sure to remove the plug from its socket.

Wiring of The Outdoor Unit

Please remove the side cover for wire connection.

WARNING

If you cannot attach the side cover due to the connecting cord, press the connecting cord in direction to the front panel to ﬁ x it.
Be sure that the hooks of the side cover is ﬁ xed in certainly. Otherwise water leakage may occur and this causes short circuit or faults.
The connecting cord should not touch to service valve and pipes. (It becomes high temperature in heating operation.)

Checking for the electric source and the voltage range

Before installation, the power source must be checked and necessary wiring work must be completed. To make the wiring capacity proper, use the wire gauges list below for the lead-in from a pole transformer and for the wiring from a switch board of fuse box to the main switch and outdoor unit in consideration of the locked rotor current.
Investigate the power supply capacity and other electrical conditions at the installing location.
Depending on the model of room air conditioner to be installed, request the customer to make arrangements for the necessary electrical work etc.
The electrical work includes the wiring work up the outdoor unit . In localities where electrical conditions are poor, use of a voltage regulation is recommended.

IMPORTANT
For (Power cord – L, N, Earth)

Cable type	Wire cross-section
3 Core	2.5mm²

For (Connecting cord – 1, 2, 3, Earth)

Cable type	Wire cross-section	Cable length
4 Core	1.5mm²	up to 25m

WARNING

Connect the Connecting Cord to “Indoor 1 (1, 2, 3)” for indoor unit 1, “Indoor 2 (1, 2, 3)” for indoor unit 2.

Grounding rod (optional)
(Earth wire and grounding rod are not supplied. Please use optional items below.)

CAUTION!
Arrange power cord so they do not touch service valve.

Note:
CAUTION

Outdoor supply cords shall not be lighter than polychloroprene sheathed ﬂ exible cord with code designation 60245 IEC 57.

IMPORTANT

Circuit Breaker
16A

FINAL STAGE OF INST ALLATION

Insulation And Maintenance Of Pipe Connection
● The connected terminals should be completely sealed with heat insulator and then tied up with rubber strap.
● Please tie the pipe and power line together with vinyl tape as shown in the ﬁ gure showing the installation of Indoor and Outdoor units. Then ﬁ x their position with holders.
● To enchance the heat insulation and to prevent water condensation, please cover the outdoor part of the drain hose and pipe with insulation pipe.
● Completely seal any gap with putty.

Power Source And Operation Test

Power Source

WARNING

● Never remodel the power plug nor extend the long-distance cord.
● Keep additional length for the power cord and do not render the plug under external force as this may cause poor contact.
● Do not ﬁ x the power cord with U-shape nail.
● The power cable easily generates heat. Do not bring the cable together with a wire or vinyl tie.

Operation Test

Please be sure to measure the supply voltage before operation test.
Please ensure that the air conditioner is in normal operating conditionduring the operation test.

Operate with Cool Mode(in summer) or Heat Mode(in winter).
Press Temperature Button on the remote controller to set the desired temperature to 16.0°C for Cool Mode or 32.0°C for
Heating Mode.
Set the desired fan speed to ” “(High).
Operate the air conditioner for 20 minutes at least and make sure that the air from the air conditioner is cool or warm.
Press the ON/Off button on the remote controller to make sure that the air conditioner stops running.

If the indication lamps of the indoor unit blink with sounding the buzzar during the operation test, performa check following the procedures below.
Indication lamps
blinking mode| What do check
---|---
All indication lamps blink three times repeatedly.| Make sure that the spindles of both service valves are open.
(Outdoor fan might operate for near 15 minutes after the
operation stop for the protection.
For the reoperation at that case, do it after outdoor fan will stop.)
Before the check and the reoperation, reset the power supply by turning off and on the circuit breaker only after:-
1. waiting for at least 5 mintes; or
2. pressing the Temporary Switch Button only once while the power is OFF.

CAUTION

Don’t operate for over 5 minutes with the situation that the spindle of the service valve is closed. This will cause the defect.
Don’t operate by Cool Mode or Dry Mode with the door and windows opened, (the room humidity is always above 80%) for a long period of time. Water will condense and drip down occasionally. This will wet your furniture.
Explain to your customer the proper operation procedures as described in the user’ s manual.
If the indoor unit won’t operate, check the cable for correct connection.
Turn on the lamp in the room where the indoor unit is installed and check the remote controller for normal operation.

CAUTION