Hitachi RAS-10GH5, RAC-10GH5, RAS-14GH5, RAC-14GH5 Installation Manual

FOR SERVICE PERSONNEL ONLY

Indoor Unit / Outdoor Unit

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.

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 funiture.

• An IEC approved power cord should be used. Power cord type: NYM.

INDOOR UNIT

WARNING

THE CHOICE OF MOUNTING SITE (Please note the following matters and obtain permission from customer before installation.)

• The unit should be mounted at stable, non-vibratory location
which can provide full support to the unit.

CAUTION

• No nearby heat source and no obstruction near the air
outlet is allowed.

• The clearance distances from top, right and left are
specified in figure below.

• The location must be convenient for water drainage and
pipe connection with the Outdoor unit.

• To avoid interference from noise, please place the unit and
its remote controller at least 1m from the radio and
television.

• To avoid any error in signal transmission from the remote
controller, please put the controller far away from high­frequency machines and high-power wireless systems.

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
specified in figure below. At least three of the above sides
must be open air.

• The installation height should be at least 2,300 mm or more
from the floor.

• 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.

Names of Indoor Components

The Length of Indoor Unit

Connecting Cord

above

0.9 m

above

1.6 m

Direction of Piping

Backward piping
from left

Connection
There are 6 directions allowed,
namely, backward piping,
backward piping from left,
horizontally piping from right,
horizontally piping from left,
vertically down from right, vertically
down from left.

1

2

Figure showing the Installation
of Indoor and Outdoor Unit.

above
50mm

above 250mm

above 100mm

about 300mm

about 0.45m

must not bend

The indoor piping should be
insulated with the enclosed
insulation pipe. (If the insulator is
insufficient, please use commercial
products.)

• 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 5m.

• 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).

The connection of insulated drain
hose.
Inner diameter 16mm

Please use insulated drain hose for
the indoor piping (commercial
product)

above 100mm

above 400mm

above 150mm

give clearance
as wide as
possible

above

200mm

Be sure to
completely
seal any gap
with putty.

Maximum pipe length 10m

INDOOR UNIT

1 Installation of Hanger, Wall Penetration and Installation of Protection Pipe

CAUTION

• The draining of the water container inside the Indoor unit can be done from the left.
Therefore the hanger must be fixed horizontally or slightly tilted towards the side of
drain hose. Otherwise, condensed water may overflow the water container.

Direct Mounting On The Wall

• Please use hidden beams in the wall to hold the hanger.

Wall hole

Weight

Line

1 Hanger

Procedures of Installation and Precautions

• Procedures to fix the hanger.

1.Drill holes on wall.
(As shown below)

2.Push plug into the holes.
(As shown below)

3.Fix the hanger on wall with

4.1 x 32 screw.
(As shown in figure below)

Wall Penetration and Installation of Protection Pipe

• Drill a ø65mm hole on wall which is
slightly tilted towards the outdoor side.
Drill the wall at a small angle.

• Cut the protection pipe according to the
wall thickness.

• Empty gap in the sleeve of protection
pipe should be completely sealed with
putty to avoid dripping of rain water into
the room.

• Please ensure smooth flow of water
when installing the drain hose. Improper
installing may wet your funiture.

• An IEC approved power cord should be
used. Power cord type: NYM.

WARNING

Be sure that the wire is not
in contact with any metal in
the wall. Please use the
protection pipe as wire
passing through the hollow
part of the wall so as to
prevent the possibility of
damaged by mouse.
Unless it seals completely,
any air with high humidity
flows from outdoor and any
dew may drop.

Seal with
putty

Protection
pipe

Sleeve of
protection
pipe

Seal with
putty

Outdoor

Indoor

2-5mm

2 Installation Of The Indoor Unit

Level

WALL

When the power is
supplied from the
indoor unit, pull the
power cable from the
cable drawer at the
right or left side of
the indoor unit.

32mm

Wall

ø4.8mm

1 Hanger

2 Screw

Wall

above 50mm

4.1 x 32 screw

Ceiling

Plug
(Procure
locally)

above 200mm

450mm

400mm
316mm

125mm

41mm

45mm

ø65mm

199mm

280mm

65mm

390mm

80mm

530mm
780mm

10mm

45mm

ø65mm

42mm

44mm

125mm

20mm

Drain Hose

Drain Hose

2 Screw for Hanger

Screw the hanger at the
positions possibly near the
upper and lower hooks where
the indoor unit is hung. Use 4 or
more screws to fix the hanger.

¡

PIPING FROM THE RIGHT SIDE (BACKWARD, DOWNWARD, HORIZONTAL)

Preparation

• Connect connecting cord.

• Pull out the pipe, connecting cord and drain hose.

Installation

• Insert the pipe through the wall hole.
¡ The upper part of the Indoor unit is hanged on the

hanger.

™ The projection at the lower part of the Indoor unit is

hooked onto the hanger.

Connecting cords, pipe and
drain hose must be laid
together with Vinyl tape.

Lift the body
of the unit
upwards and
then force it
downwards.

1 Hanger

Refrigerating
Pipe

Protection
Pipe

Drain Hose

Connecting Cord

1 Hanger

Projection

™

PIPING FROM THE LEFT SIDE (BACKWARD, DOWNWARD, HORIZONTAL)

Preparation

Changed of Drain Hose and Installation Procedures.

•

Exchange the location of drain hose and drain cap while installing the pipe from the left side as
shown in below. Be sure to plug in the drain hose until the insulating material folds upon itself.

• Please use pliers to pull out the drain cap.
(This is an easier way to remove the drain
cap).

CAUTION

Insufficient insert may
result in water leakage.

Drain Hose

Drain cap

Drain cap

•

Remove low cover

•

Insert drain cap up to the
location securely till the
cap stops.

Rib at the Indoor unit

Insulating
section of the
drain hose end

Cutting Low Cover bush

• While installing the pipe from the right, left or
bottom side, use a knife to cut openings as
shown in figure. Then smoothen the edges of
openings with a file.

Openings

•

Push the pipe deeply until the insulating
section of the drain hose end gets over the
rib at the indoor unit side.

Openings

CAUTION

• The rubber strap used for fixing the insulator
should not be tied with great force. Otherwise,
this will damage heat insulation and causes
water condensation.

• Please pull the lower part of the Indoor unit
outwards to check if the unit is hooked onto
the hanger. Improper installation may cause
vibration and noise.

• Transform the piping while holding down the
lower portion of pipe-support by hand.

Pipe

Rubber strap tied
with great force

Pipe
support

Transform after
bending downward.

INSTALLATION AFTER CONNECTION OF REFRIGERATING PIPES

• The refrigerating pipe should be adjusted to fit into
the hole on the wall and then ready for further
connection.

• The terminals of 2 connected pipes must be covered
with insulator used for terminal connection. Then the
pipes are wrapped with insulation pipe.

• Connect the connecting cord after removing low
cover.
(Refer to "CONNECTION OF POWER CORD")

• After adjustment, fit the connecting cord and pipes
into the space available under the unit. Use holder to
hold them tight.

• Holder can be attached at the either of 2 places.
Please select the easier position.

Holder

Pipe

Connecting
cord

Drain hose

Insulation pipe (must be wrapped with
vinyl tape at every 120 mm)

THE CONNECTION OF REFRIGERATING PIPE DURING
THE INSTALLATION OF INDOOR UNIT

Preparation To Install Refrigerating Pipes

• The refrigerating pipes and connecting cord
transform and are attached.

0.85m
below
5mm

Please bend at a small
radius to form an arc

Installation

Hang the indoor unit onto the hanger. Use the temporary stand
at the back of the Indoor unit to push its lower part 15cm
forwards.

• Place the drain hose through the hole on the wall.

• Wrap the refrigerating pipes with insulation pipe after
connecting refrigerating pipe.

• Connect the connecting cord after removing low cover.
(Refer to "Connection of Power Cord")

• After adjustment, the connecting cord and refrigerating pipes
are placed into the space available under the Indoor unit.

• The projection of Indoor unit must hook to the hanger.

about 15cm

Hook

Projection

Protection
pipe

Pull this to the front during the
connection of refrigerating
pipe to ease task.

Heat
insulation pipe

Connecting cord

Holder

Connected
section

Refrigerating
pipe

Connecting
cord

Drain hose

Wall hole

Pipe

Drain hose

Cable

4 Installation of Drain Hose

CAUTION

Be sure that the drain hose is
not loosely connected bend or
proper condition like left figure.

CAUTION

You are free to choose the side (left or right) for the installation of drain
hose. Please ensure the smooth flow of condensed water of the Indoor
unit during installation. (Careless may result in water leakage.)

Condensed
water pond

Bending upwards

Condensed water
pond

Ditch

• The connected terminals should be completed sealed
with heat insulator and then tied up with rubber strap.

• Do not tie the terminals with the tape too tight.
If any clearance or over-tightening may cause
condensation.

• Please tie the pipe and power line together with vinyl
tape as shown in the figure showing the installation of
Indoor and Outdoor units.

• 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.

Insulation material for pipe
connection

Sleeve of
protection pipe

Putty

Putty

Cable drawer (right side)

Visible outline of the
outdoor unit

Wall hole

Wall hole

Pipe

Drain hose

Cable

Drain layout of
backward piping

Drain layout of backward piping from left

The end of the refrigerating pipes are at
locations marked with “▼

▼” symbol.

3 Heat Insulation and Finish of the Piping

2,300 mm or more

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.

¡

™

RAS-10GH

RAC-10GH

RAS-1 GH

RAC-1 GH

5 /

5

4

5 /

4

5

Screw for Hanger

(Φ4.1x32)

AAA Size Battery

Hanger

QtyNo. Component’s Name

1

6

2

Remote Controller

1

2

3

4

5

1

1

Drain Pipe

Dimension of Mounting

Stand of the outdoor unit

(unit : mm)

500
750

50

330

310

290

500
698

45

300

282

257

(10GH5)

(14GH5)

The installation height of the indoor unit must be at least
2300mm or more from the floor.

•

• 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 reverse order of the removal.

Please face this side (suction side)
of the unit to the wall.

Please remove terminal cover
when connecting the piping
and connecting cord.

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.

• Install the outdoor unit horizontally and make sure that condensate drains away.

• In case of using in chilly area
Especially, 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

• 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.

Copper pipe

Trimming tool

• Before flaring, please put on the flare nut.

A

Die

Die

Copper pipe

• Please use
exclusive tool for
refrigerant R410.

Outer A (mm) Rigid Flaring Tool
Diameter (Ø) For R410A tool For R22 tool

6.35 (1/4") 0 - 0.5 1.0

9.52 (3/8") 0 - 0.5 1.0

2 Pipe Connection

CAUTION

• 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.

• Be sure to tighten the flare nut to the specified torque with
a torque wrench.
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.

INSTALLATION OF REFRIGERATING PIPES AND AIR REMOVAL

Torque
wrench

Flare nut

Wrench

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)

Small diameter side

6.35 (1/4") 19.6 – 24.5 (200 – 250)

Large diameter side

9.52 (3/8") 19.6 – 24.5 (200 – 250)

Valve core cap 12.3– 15.7 (125 – 160)

Torque N·m

(kgf·cm)

Valve

head cap

3Remove of Air From The Pipe And Gas Leakage Inspection

AIR REMOVAL

Procedures of using Vacuum Pump for Air Removal

As shown in right figure, 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.

1

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.

2

Completely unscrew the spindle of the
service valve (at 2 places) in anticlockwise
direction to allow the flow of refrigerant
(using Hexagonal Wrench key).

3

Tighten the cap of valve head. Check the
cap's periphery if there is any gas leakage.
The task is then completed.

4

When the meter reaches - 101KPa
(-76cmHg) during pumping fully
tighten the shuttle.

Meter showing
pressure

Closed

R410A
Manifold
valve

Vacuum
pump

Valve

Charge
hose

Vacuum
pump
adapter

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

Hexagonal
wrench Key

Cap of valve
head

Gas leakage inspection

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.

CONNECTION OF POWER CORD

OUTDOOR UNIT

FINAL STAGE OF INSTALLATION

1Preparation of Pipe

• Use a pipe cutter to cut the copper pipe and remove burr.

How to remove the front cover How to Attach the Front Cover

¡ Check that the drain pan is securely attached.
™ After installing the front cover onto the unit, hook three claws

at upper side of the cover securely. Then, push the center of
the front cover to lock the claws.

£ Tighten the two screws.

¢ Install the filter.
∞ Slide the shafts of the right and left arms on the front panel

along the steps to insert the shafts into the holes till they stop.
After checking that the shafts are securely inserted, close the
panel.

¡ Remove the front panel

• Please remove and attach the front panel by both hands.

• After opening the front panel by both hands.

1 Undo the right arm while pushing it inside.
2 Slide the front panel to right as shown in figure. Then remove

while pulling it to front.

™ Remove the filters.
£ After removing two screws, pull the center of the front cover

towards you and release the claws.

¢ Pull the side faces (lower sections) of the front cover towards

you as shown in the figure and remove the cover.

Cap of valve
head

< S4249 : >

Valve

Step

Shaft

Hole

CAUTION

• Do not touch the suction
port, bottom surface, or
aluminum fin of the outdoor
unit.
Failure to do so may cause
an injury.

• Push up the [PUSH] sections at the bottom of the indoor unit and
pull the bottom plate towards you. Then the claws are released
from the stationary plate.
(The [PUSH] sections are indicated by 2 arrows in the right figure)

HOW TO REMOVE INDOOR UNIT

[PUSH] mark positions

Outer diameter

of pipe (ø)

DRAIN PIPE

DRAIN HOLE

above
100mm

BASE

Outer diameter: 16 mm or more

RAC-14GH5

RAC-10GH5

Be sure to use only wire specified for the use of air-conditioner.
Please refer to the manual for wire connection and the wiring technique should meet the standards of the electrical
installation.
There is a AC voltage drop between the AB terminal if the power is on. Therefore, be sure to remove the plug from its socket.

THIS APPLIANCE MUST BE EARTHED.

Procedures of Wiring

Wiring Of The Outdoor Unit

Please remove the side cover for wire connection.

Power supply shall be connected at the rated voltage, otherwise the unit will be broken or could not reach the specified capacity.

Wiring Of The Indoor Unit

Procedures of Wiring
Open the front panel, loosen and remove the screw at the electric box cover located at the right side of front cover.
Loosen and remove the screw fixing inner cover (sheet metal).
After inserting the connecting cords from the s-cover of air outlet, bend the tips of connecting cords as shown in the figure below.
Fix the cords securely to the inner cover (sheet metal) according to their respective colors. (Tightening torque: 5kgf·cm).
After the wiring is done, reinstall the inner cover (sheet metal) and the electric box cover accordingly.

WARNING

WARNING

RAC-14GH5

RAC-10GH5

Wire clamp for
power cord

cover

white black red

yellow

A
B
C
D

A
B
C
D

AC 230V

A

B

C

D

5

Terminal cover

The earth line terminal of the outdoor unit is below the
service valve.
To avoid short circuit, it is necessary to install circuit breaker
depending on the mounting location of the unit.
Do not place earth line near the following objects:
(1) Water pipe
(2) Gas pipe — There is danger of catching fire.
(3) The earth line of lightning conductor and telephone —

short ci

rcuit may occur during lightning.

CAUITON

n

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

burn the terminal.

tight. Improper insertion may

Pull at the ¡ and ™ in

the directions as shown

by arrows to remove the

cover.

¡

™

Green + Yellow

Earth Line And Circuit Breaker

Power Source And Operation Test

Power Source

CAUTION

!

●

Please use a new socket. Accident may occur due to the use of old
socket because of poor contact.

●

Please plug in and then remove the plug for 2 – 3 times. This is to
ensure that the plug is completely plugged into the socket.

●

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.

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.

WARNING

●

If you cannot attach the side cover due to the

connecting cord, press the connecting cord in direction

to the front panel

●

Be sure that the hooks of the side cover is fixed in

certainly. Otherwise water leakage may occur and this

causes short

●

The connecting cord should not touch to service valve

and pipes. (It becomes high temperature in heating

operation.)

to fix it.

circuit or faults.

5~10mm

ABC

D

ABC

D

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.

After remove the screw
and terminal cover, and
put the connecting cords
and fix the terminal cover
with screw.

After remove the screw
and terminal cover, and
put the connecting cords
and fix the terminal cover
with screw.

1

The indoor unit is supplied with a power cord without AC power plug.Please use a AC power plug

acc. to the technical standards in your country.

The AC outlet closed to the indoor unit, electrical installation cable (3x1,5mm²) and fuse breaker

(16A) has to be installed in accordance

to the technical standards in

your country

.