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<0016693Y>
FOR SERVICE PERSONNEL ONLY
1
EN
OUTDOOR UNIT
RAC-18WPC
RAC-25WPC
MODEL
RAC-35WPC
RAC-50WPC
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 figures 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 a customer to keep this installation manual together with the instruction manual.
WARNING
Please request your sales agent or qualified technician to install your unit. Water leakage, short circuit or fire 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 fire.
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 official in your country. Be sure to use the specified circuit. A short circuit and
fire may occur due to the use of low quality wire or improper work.
Be sure to use the specified 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 fire.
Please use the specified components for installation work. Otherwise, the unit may collapse or water leakage, electric shock, fire or
stronger vibration may occur.
Be sure to use the specified 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 specified 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 fire, 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 fire in the fan-driven heater, space heater, etc., a poisonous gas may occur.
Unauthorized modifications to the air conditioner may be dangerous. If a breakdown occurs please call a qualified air conditioner
technician or electrician. Improper repairs may result in water leakage, electric shock and fire, 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 finishing 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.
The electric cables should neither be reworked nor added.
Make sure to use an exclusive circuit breaker.
Otherwise fire or electric shock might occur by connection failure, isolation failure or over current.
Make sure to connect cables to terminal properly and terminal cover should close firmly.
Otherwise, over heating at terminal contact, fire or electric shock might occur.
Make sure that there is no dust on any connected points of electric cables and fix firmly.
Otherwise, fire or electric shock might occur.
Please mount the Outdoor unit of 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 the
re verse order of the removal.
RAC-18WPC/RAC-25WPC
RAC-35WPC
Please face this side
Please face this side
Please remove side cover
Please remove side cover
(suction side) of the
(suction side) of the
when connecting the piping
when connecting the piping
unit to the wall.
unit to the wall.
and connecting cord.
and connecting cord.
Pull downward
Pull downward
Do not touch the suction port, bottom surface,or aluminum fin of the outdoor unit.Failure to do so
CAUTION
may cause an injury.
CONDENSED WATER DISPOSAL OF OUTDOOR UNIT
There is holes on the base of Outdoor unit for condensed water to exhaust.
In order to flow 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 figure. Join the drain pipe to one hole.
After installation, check whether the drain pipe clings to the base firmly.
RAC-18WPC/RAC-25WPC
RAC-35WPC
DRAIN HOLE
BASE
BASE
BUSH
above
above
Push Push
100mm
70mm
DRAIN HOLE
2
BUSH
1
DRAIN PIPE
Outer diameter :
1
DRAIN PIPE
Outer diameter :
16 mm or more
16 mm or more
Install the outdoor unit horizontally and make sure that condensate drains away.
In case of using in chilly area
pecially, in case that there are many snows by very cold in chilly area, condensed water freezes
on the base and may result not to drain. In this case, please remove the bush and the drain pipe at the bottom of unit.(Left and
center near discharge portion of air, each 1 place).It becomes smooth drain.Ensure that the distance from the drain hole to
the ground is 250 mm or more.
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 flammable gas.
The outdoor unit may catch fire if flammable gas leaks around it.
Please ensure smooth flow 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.
THE CHOICE OF MOUNTING SITE
(P lease note the following matters and obtain permission from customer before installation.)
WARNING
The Outdoor unit must be mounted at a location which can support heavy
weight. Otherwise, noise and vibration will increase.
CAUTION
Selecting the installation location: Suitable location that will reduce the impact
from rain and direct sun that may affect the unit performance.
Besides,ventilation must be good and clear of obstruction .
The air blown out of the unit should not point directly to animals or
The clearances of the unit from top, left, right and front are specified in figure
below . At least three 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 flammable gas,steam, oil and smoke.
The location must be convenient for water drainage.
Place the Outdoor unit and its connecting cord at least 1 m away from the antenna
or signal line of television, radio or telephone. This is to avoid noise interference.
Figure showing the Installation of Outdoor Unit.
Names of Outdoor Components
Dimension of Mounting
No.
Stand of the Outdoor unit
RAC-18WPC/RAC-25WPC
Mounting Stand
1
50
12
34
500
2
80
660
RAC-35WPC
Mounting Stand
50
12
35
500
125
750
RAC-50WPC
Mounting Stand
57
12
39
500
146
792
(unit : mm)
give clearance as wide as possible
above 200mm
The clearances of the
unit from top, left, right
and front are specified
in figure below. At least
three of the above sides
must be open air.
Please remove side
above
RAC-50WPC
100mm
cover when connecting
Please face this side(suction
the piping and connecting
side) of theunit to the wall.
cord.
above
300mm
For outdoor unit installation,allow
at least 2 sides of space around
the unit to ensure ventilation flue.
Pull downward
Drain hose
Drains the dehumidified water from the indoor unit to the
outdoor during "cooling" or "dehumidifying" operation.
Piping and Wiring
Air inlets (Rear and left sides)
Air outlet
When" heating"operation is performed,
cool air blows and when "cooling" or
"dehumidifying" operation is performed,
warm air blows.
About the outdoor unit:
When "Stop" is selected during operation
of the indoor unit, the fan of the outdoor
RAC-50WPC
unit continues turning for 10 to 60
seconds to cool the electric parts down.
In heating operation, condensate or
BASE
water due to defrosting will flow.
Do not cover the drain port of the outdoor
unit because such water may freeze in
above
the chilly area.
100mm
When the outdoor unit is hung on the
DRAIN HOLE
ceiling, install the bush and drain pipe
2
BUSH
Outer diameter :
on the drain port and drain water.
1
DRAIN PIPE
16 mm or more
MODEL
WIDTH (mm) HEIGHT (mm) DEPTH (mm)
RAC-18WPC, RAC-25WPC
660
RAC-35WPC
750
RAC-50WPC
792
1
Preparation of Pipe
Use a pipe cutter to cut the copper pipe and remove burr.
Trimming tool
Copper pipe
Before flaring, please put on the flare nut.
Die
Die
A
Please use
exclusive tool for
refrigerant R410 .
Copper pipe
2
Pipe Connection
In case of removing flare nut of a indoor unit, first remove a nut of small
diameter side, or a seal cap of big diameter side will fly out. Free from
water into the piping when working.
CAUTION
Be sure to tighten the flare nut to the specified torque with a torque wrench.
plants.
If the flare nut is overtightened, the nut may be split after a long period has
passed, and may cause a refrigerant leak.
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.
Flare nut
Torque
Wrench
Item
Qty
wrench
Drain Pipe
1
WARNING
THIS APPLIANCE MUST BE EARTHED.
Bush
Procedures of Wiring
1
(35WPC)
Indoor Unit
Outdoor Unit
Bush
Bush
2
(50WPC)
1 2 3
L N
1 2 3
The refrigerating machine oil is
easily affected by moisture. Use
Connecting Cord
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
Detail of Cutting the Connecting Cord
big or small, should all be
insulated with insulation pipe and
Outdoor Unit
then wrapped with vinyl tape.
160mm
(The insulator will deteriorate if
10mm
it is not wrapped with tape).
1
Strip
2
wires
The connection of insulated
3
drain hose.
Green +
Inner diameter 16mm
Yellow
20mm
100mm
Please use insulated drain
hose for the indoor piping
WARNING
(commercial product)
The naked part of the wire core should be 10mm fix it to the terminal tightly. Then
try to pull the individual wire to check if the contact is tight. Improper insertion may
above
50mm
burn the terminal.
give clearance as wide
Be sure to use only wire specified for the use of air-conditioner.
as possible
Please refer to the manual for wire connection and the wiring technique should
meet the standard of the electrical installation.
above
200mm
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.
When the fuse (F5 or F6) has been blown out by the improper connection of power
cable, it can be restored by the attached reserve fuse.
Please exchange the blown-out fuse after making sure the right connection.
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 fix 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 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 won't operate, check the cable for correct
530
278
connection.
548
288
Turn on the lamp in the room where the indoor unit is installed
and check the remote controller for normal operation.
600
299
3
Remove of Air From The Pipe And Gas Leakage Inspection
Procedures of using Vacuum Pump for Air Removal
CAUTION
As shown in right figure, remove the cap
of valve core. Then, connect the charge
Remove burr and jagged edge will cause leakage.
1
hose. Remove the cap of valve head.
Point the side to be trimmed downwards during
Connect the vacuum pump adapter to the
trimming to prevent copper chips from entering
vacuum pump and connect the charge
the pipe.
hose to the adapter.
Outer
A (mm) Rigid Flaring Tool
Fully tighter the "Hi" shuttle of the manifold
Diameter (Ø)
For R410A tool
For R22 tool
valve and completely unscrew the "Lo"
shuttle. Run the vacuum pump for about
6.35 (1/4")
0 - 0.5
1.0
10-15 minutes, then completely tighten the
A
9.52 (3/8")
0 - 0.5
1.0
"Lo" shuttle and switch off the vacuum
12.7 (1/2")
0 - 0.5
1.0
2
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
3
direction to allow the flow of refrigerant
Outer diameter
Torque N·m
(using Hexagonal Wrench key).
of pipe (ø)
(kgf·cm)
Tighten the cap of valve head. Check the
Small diameter side
6.35 (1/4")
13.7-18.6 (140 - 190)
4
cap's periphery if there is any gas leakage.
9.52 (3/8")
34.3-44.1 (350 - 450)
The task is then completed.
Large diameter side
12.7 (1/2")
44.1-53.9 (450 - 550)
Small diameter side
6.35 (1/4")
19.6-24.5 (200 - 250)
Gas leakage inspection
Valve
9.52 (3/8")
19.6-24.5 (200 - 250)
head cap
Large diameter side
Please use gas leakage detector to check if leakage occurs at
12.7 (1/2")
29.4-34.3 (300 - 350)
connection of Flare nut as shown on the right.
If gas leakage occurs, further tighten the connection to stop leakage.
Valve core cap
12.3-15.7 (125 - 160)
Leave some space in the connecting cord for maintenance purpose and be
sure to secure it with the cord band.
WARNING
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.
Wiring of the Outdoor Unit
Please remove the side cover for wire connection.
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 fix it.
Be sure that the hooks of the side cover fixed in certainly. Otherwise water leakage may occur
WARNING
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.)
AC 220-230V
Checking for the electric source and the voltage range
1ø 50Hz
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.
erminal marking
T
L N 1 2 3
cover
Earth
terminal
Connecting cord
Cord band
RAC-18WPC/RAC-25WPC
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.
When the meter reaches - 101KPa
(-76cmHg) during pumping fully
tighten the shuttle.
Meter showing
pressure
Closed
R410A
Charge
Manifold
hose
valve
Vacuum
pump
Valve
Vacuum
pump
adapter
Valve
When pumping starts, slightly
loosen the flare nut to check of
air sucked in. Then tighten the
flare nut.
The body of service valve
Cap of
valve core
Cap of valve head
Hexagonal wrench Key
Cap of valve
head
L N 1 2 3
cover
L N 1 2 3
cover
Earth
Earth
terminal
terminal
Cord band
Cord band
RAC-35WPC
RAC-
5
0
W
P
C
IMPORTANT
Fuse Capacity
RAC-18/25/35WP
C 15A time delay fuse
RAC-50WPC
25A time delay fuse
Wire length
Wire cross-section
2
up to
6m
1.5mm
up to 15m
2.5mm
2
2
up to 20m
4.0mm
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Summary of Contents for Hitachi RAC-25WPC
- Page 1 If the indoor unit won't operate, check the cable for correct on the base and may result not to drain. In this case, please remove the bush and the drain pipe at the bottom of unit.(Left and RAC-18WPC, RAC-25WPC connection.
- Page 2 Bei einem Einsatz in kalten Umgebungen mit eventuell viel Schnee kann das Kondenswasser an der Bodenplatte gefrieren die Verbindung korrekt ist. RAC-18WPC, RAC-25WPC und den Ablauf verhindern. In diesem Fall entfernen Sie den Stopfen und die Abflussleitung an der Unterseite des Geräts.