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L(A) N(B) C D
L(A) N(B) C D
L(A) N(B) C D
10mm
50mm
10mm
50mm
20mm
100mm
10mm
160mm
20mm
100mm
10mm
160mm
OUTDOOR UNIT
(9)
9
300
500
282
30
12
100
45
330
310
(10)
10
500
35
50
12
125
• 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 exclusive use tool for R410A) •
ª
·
Screwdriver
• Measuring Tape • Knife • Saw • ø65mm Power Drill
• Hexagonal Wrench Key (
4mm) • Wrench (14,17,19,
22mm) Gas leakage Detector • Pipe Cutter • Putty
• Vinyl Tape • Pliers • Flare Tool Vacuum Pump Adapter
Manifold Valve Charge Hose Vacuum Pump
FOR SERVICE PERSONNEL ONLY
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7
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OUTDOOR UNIT
RAC-25NX2
RAC-35NX2
RAC-50NX2
HITACHI SPLIT UNIT AIR CONDITIONER
INSTALLATION MANUAL
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.
Make sure to connect earth line.
This sign in the gures indicates prohibition.
Be sure that the unit operates in proper condition after installation. Explain to customer the proper operation and maintenance of the unit
as described in the user’s guide. Ask customers to keep this installation manual together with the instruction manual.
WARNING
• Please request your sales agent or quali ed technician to install your unit. Water leakage, short circuit or re may occur if you do the installation work
yourself.
• Please observe the installation stated in the installation manual during the process of installation. Improper installation may cause water leakage, electric
shock and re.
• 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 cables which are approved of cial in your country. Be sure to use the speci ed circuit. A short circuit and re may occur due to the use of low
quality wire or improper work.
• Be sure to use the speci ed cables 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 to prevent the external force is being applied to the connection section of the terminal base. Improper insertion and
loose contact may cause over-heating and re.
• Please use the speci ed components for installation work. Otherwise, the unit may collapse or water leakage, electric shock, re or stronger vibration
may occur.
• Be sure to use the speci ed piping set for R410A. Otherwise, this may result in broken copper pipes or faults.
• When installing or transferring an air conditioner to another location, make sure that air other than the speci ed refrigerant (R410A) does not enter the
refrigeration cycle. If other air should enter, the pressure level of the refrigeration cycle may increase abnormally which could result in a rupture and injury.
• Be sure to ventilate fully if a refrigerant gas leak while at work. If the refrigerant gas comes into contact with re, a poisonous gas may occur.
• 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 re in the fan-driven heater, space heater, etc., a poisonous gas may occur.
• Unauthorized modi cations to the air conditioner may be dangerous. If a breakdown occurs please call a quali ed air conditioner technician or electrician.
Improper repairs may result in water leakage, electric shock and re, etc.
• Be sure to connect the earth line from the power supply wire to the outdoor unit and between the outdoor and indoor unit. Do not
connect the earth line to the gas tube, water pipe, lighting rod or the earth line of the telephone unit. Improper earthing may cause
electric shocks.
• When nishing the refrigerant collection (pumping down), stop the compressor and then remove the coolant pipe. If you remove the refrigerant pipe while
the compressor is operating and the service valve is released, air is sucked and a pressure in the freezing cycle system will build up steeply, causing
an explosion or injury.
• When installing the unit, be sure to install the refrigerant pipe before starting the compressor.
If the refrigerant pipe is not installed and the compressor is operated with the service valve released, air is sucked and the pressure level of the refrigeration
cycle may increase abnormally which could result in a rupture and injury.
CAUTION
• A circuit breaker must be installed in the house distribution box for the direct connected power supply cables to the outdoor unit. In case of other
installations a main switch with a contact gap or more than 3mm has to be installed. Without a circuit breaker, the danger of electric shock exists.
• Do not install the unit near a location where there is ammable gas. The outdoor unit may catch re if ammable gas leaks around it.
• Please ensure smooth ow of water when installing the drain hose. Improper installing may wet your furniture.
• An IEC approved power cord should be used. Power cord type: NYM.
Names of Components
THE CHOICE OF MOUNTING SITE
(Please note the following matters and obtain permission from customer before installation.)
No.
Item
Qty
1
Bush
(RAC-35NX2) 1
(RAC-50NX2) 2
Drain
Pipe
2
1
OUTDOOR UNIT
WARNING
• The outdoor unit must be mounted at a location which can support heavy 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 speci ed in gure below. At least two 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 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.
Condensed water disposal of outdoor unit
• There is holes on the base of outdoor unit for condensed water to exhaust.
• In order to 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 gure. Join the drain pipe to one hole.
• Cover the drain hole with a bush. To install the bush, put it on the drain hole as shown in the gure and press the both
sides of the bush to t into the hole. After installation, check whether the drain pipe and bush cling to the base rmly.
•
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. Reinstall the side
cover in reverse order of the removal.
Pull downward
Please face this side (suction
side) of the unit to the wall.
Please remove side cover
when connecting the piping
and connecting cord.
Above 100mm
Base
• Install the outdoor unit horizontally and make sure that condensate drains away.
• In case of using in cold weather area
Especially when there are heavy snows in cold weather area, condensed water freezes on the base and may not drain.
In this case, please remove the bush and the drain pipe at the bottom of the unit (left and centre near discharge portion
of air, each 1 place) to restore smooth drainage. Ensure that the distance from the drain hole to the ground is 250mm
or more.
RAC-35NX2 / RAC-50NX2
RAC-25NX2
Please face this side (suction side)
of the unit to the wall.
Please remove terminal
cover when connecting the
piping and connecting cord.
RAC-35NX2
RAC-25NX2
RAC-50NX2
• Do not touch the suction port, bottom surface, or aluminium n of the outdoor unit.
• Failure to do so may cause an injury.
CAUTION
Outer diameter:
16mm or more
Drain hole
Drain pipe
Above 100mm
Base
Outer diameter: 16mm
Drain hole
Drain pipe
Bush
Above 100mm
Base
Outer diameter: 16mm
Drain hole
Drain pipe
Bush
Cover
Cover
Earth terminal
AIR REMOV
AL
INST
ALLA
TION OF REFRIGERA
TING PIPES
AND
AIR REMOV
AL
Procedures of using vacuum pump for air removal
A
1. Preparation of pipe
• Use a pipe cutter to cut the copper pipe and remove burr.
Die
Copper pipe
Die
Trimming tool
Copper pipe
2. Pipe connection
Flare nut
Wrench
Torque wrench
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 tighter the “Hi” shuttle of the manifold valve
and completely unscrew the “Lo” shuttle. Run
the vacuum pump for about 10-15 minutes, then
completely tighten the “Lo” shuttle and switch off
the vacuum pump.
• Loosen the spindle of the service valve with
small diameter by 1/4 turn and tighten the spindle
immediately after 5 to 6 seconds.
• Remove the charging hose from the service
valve.
Completely unscrew the spindle of the service valve
(at 2 places) in anticlockwise direction to allow the
ow of refrigerant (using Hexagonal Wrench key).
Tighten the cap of valve head. Check the cap’s
periphery if there is any gas leakage. The task is
then completed.
1
2
3
4
Please use gas leakage detector to check if leakage occurs at connection of Flare nut as shown
on the right.
If gas leakage occurs, further tighten the connection to stop leakage.
Cap of valve core
Cap of valve head
Hexagonal wrench key
3. Remove of air from the pipe and gas leakage inspection
Gas leakage inspection
Outer diameter
Torque N·m
of pipe (ø)
(kgf·cm)
Small diameter side
6.35 (1/4”)
13.7 – 18.6 (140 – 190)
Large diameter side
9.52 (3/8”)
34.3 – 44.1 (350 – 450)
12.7 (1/2”)
44.1 – 53.9 (450 – 550)
Small diameter side
6.35 (1/4”)
19.6 – 24.5 (200 – 250)
Valve head cap
Large diameter side
9.52 (3/8”)
19.6 – 24.5 (200 – 250)
12.7 (1/2”)
29.4 – 34.3 (300 – 350)
Valve core cap
12.3 – 15.7 (125 – 160)
• Before aring, please put on the are nut.
• Please use exclusive tool for refrigerant R410A.
Outer diameter (ø)
A (mm) Rigid Flaring Tool
For R410A tool
For R22 tool
6.35 (1/4”)
0 – 0.5
1.0
9.52 (3/8”)
0 – 0.5
1.0
12.7 (1/2”)
0 – 0.5
1.0
• Please be careful when bending the copper pipe.
• Screw in manually while adjusting the center.
After that, use a torque wrench to tighten the connection.
CONNECTION OF POWER CORD
Procedures of wiring
Connecting cord
Outdoor unit
Indoor unit
AC 220–230V
1ø 50Hz
WARNING
THIS APPLIANCE MUST BE EARTHED.
WARNING
• The naked part of the wire core should be 10mm 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 speci 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.
• 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 re.
Wiring of the outdoor unit
Please remove the side cover for wire connection.
WARNING
• If you cannot attach the side plate due to the connection cord, please press the connecting cord in the direction to the front
panel to x it.
• Be sure that the hooks of the side cover 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.)
• 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.
• Install outdoor for the room air conditioner within the reaching range of the line cord.
IMPORTANT
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 gauge list below for the wiring from house distribution fuse box to the outdoor unit in consideration
of the blocked rotor current.
IMPORTANT
When putting two connecting cords through the band.
Screw
Connecting cord
Insulating plate
Cord band
Earth terminal
RAC-35NX2 / RAC-50NX2
RAC-25NX2
When the meter reaches -101KPa
(-76cmHg) during pumping fully
tighten the shuttle.
Meter showing pressure
Closed
R410A Manifold valve
Vacuum pump
Vacuum pump adapter
Valve
Charge hose
Valve
When pumping starts, slightly loosen
the are nut to check of air sucked in.
Then tighten the are nut.
Cap of valve head
The body of service valve
Detail of cutting the connecting cord
• Outdoor unit
RAC-35NX2
RAC-25NX2
RAC-50NX2
Cover
Earth terminal
Dimensions of Mounting Stand of the Outdoor Unit
When the meter reaches -101KPa
(-76cmHg) during pumping fully
tighten the shuttle.
Meter showing
pressure
Closed
R410A Manifold valve
Vacuum pump
Vacuum pump adapter
Valve
Charge hose
Valve
When pumping starts, slightly loosen
the are nut to check of air sucked in.
Then tighten the are nut.
Mounting Stand
• Remove burr and jagged edge will cause leakage.
• Point the side to be trimmed downwards during trimming to prevent copper chips from entering the pipe.
CAUTION
• In case of removing are nut of a indoor unit, rst remove a nut of small diameter side, or a seal cap of big diameter
side will y out. Free from water into the piping when working.
• Be sure to tighten the are nut to the spec ed torque with a torque wrench. If the are nut is overtightened, the nut may
be split after a long period has passed, and may cause a refrigerant leak.
CAUTION
Fuse Capacity
16A time delay fuse
(unit : mm)
Mounting Stand
RAC-25NX2
RAC-35NX2 / RAC-50NX2
above 200mm
*
A
above 100mm
above 200mm
( )
above 50 mm when
installed on the
ceiling of balcony
*
B
(This gure is RAC-50NX2)
• The refrigerating machine oil is easily affected by moisture. Use caution
to prevent water from entering the cycle.
• The difference in height between the indoor and outdoor unit should
be kept below 10m.
• The connecting pipe, no matter big or small, should all be insulated
with insulation pipe and then wrapped with vinyl tape. (The insulator
will deteriorate if it is not wrapped with tape.)
Inner diameter ø16mm
The connection of insulated drain hose.
Please use insulated drain hose for the indoor
piping (commer cial product).
Maximum pipe length 20m
RAC-25NX2
C, D
L, N
Green + Yellow
Green + Yellow
Strip wires
RAC-35NX2 / RAC-50NX2
Green + Yellow
Strip wires
Green + Yellow
C, D
L, N
For outdoor unit installation, allow at least 2 sides of
space around the unit to ensure ventilation ue.
RAC-25NX2
RAC-35NX2
RAC-50NX2
A
B
above 400mm
above 150mm
above 300mm
above 50mm
above 200mm
above 50mm
*
give clearance as wide as possible
FINAL
ST
AGE OF INST
ALLA
TION
1. Operation test
• Please ensure that the air conditioner is in normal operating condition during the operation test.
• Explain to your customer the proper operation procedures as described in the user’s manual.
• If the indoor unit does not operate, check to see that the connections are correct.
• Turn on the lamp in the room where the indoor unit is installed and check the remote controller for normal operation.
Insulation and maintenance of pipe connection
• The connected terminals should be completed 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
gure showing the installation of Indoor and outdoor units. Then x their position
with holders.
• To enhance 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.
Force-cooling operation
• When the service switch of the outdoor unit is pressed for 1 or more seconds, the force-cooling operation starts. Use
this mode when performing the failure diagnosis or collecting refrigerant into the outdoor unit.
Sleeve of
protection pipe
Putty
Putty
OUTSIDE INSIDE
Screw
Cover
Service switch (If the switch is pressed
for more than 1 second, the force-
cooling operation starts. If the switch
is pressed for additional more than 1
second, the operation stops.)
RAC-35NX2 / RAC-50NX2
RAC-25NX2
Screw
CAUTION
Do not operate the unit for more than 5 minutes while the spindle of the service valve is closed.
Service switch (If the switch is
pressed for more than 1 second,
the force-cooling operation
starts. If the switch is pressed
for additional more than 1
second, the operation stops.)
Please remove side cover.
Wire length
Wire gauge
up to 6m
1.5mm
2
up
to
15m 2.5mm
2
up
to
20m 4.0mm
2
up to 6m
1.5mm
2
up to 20m
2.5mm
2
L, N
C, D
1_RAC-25_35_50NX2_Inst_Out_EN.indd 1
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