Hitachi RAC-14KH2, RAS-14KH2 User Manual

FOR SERVICE PERSONNEL ONLY

0.8m

1.5m

Connection

Horizontally
perpendicular
to the unit

57

12
35

124

500

320

10

20

(10)

340

mounting stand

!

!

!

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

[

Drain cap

Please insert
until here

Drain hose

Please insert
until here

Openings

Pipe

Connecting
cord

Drain hose

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

8

Holder

Pipe

Rubber strap tied with great force

below
5mm

Please bend at a small
radius to form an arc

●

Carefully read through the procedures of proper
installation before starting installation work.

●

The sales agent should inform customers regarding
the correct operation of installation.

SPLIT UNIT AIR CONDITIONER

INSTALLATION MANUAL

Indoor Unit Outdoor Unit

RAS-14KH2 RAC-14KH2

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.

!

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 instructions 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 power cables approved by the authorities of your country.

●

Be sure to use the specified 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 fire.

●

Please use the specified components for installation work. Otherwise, the units may collapse or water leakage, electric shock
and fire 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 removing an air conditioner, 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 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.

!

CAUTION

●

A circuit breaker or fuse must be installed. Without a circuit breaker or fuse the danger of electric shock exists.
A main switch with a contact gap of more than 3mm has to be installed in the power supply line to the outdoor unit.

●

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.

●

Piping shall be suitable supported with a maximum spacing of 1m between the supports.

Tools Needed For Installation Work

●

+ – Screwdriver

●

Saw ● ø 65mm Power Drill ● Hexagonal Wrench

●

Measuring Tape

Key ( 4mm) ● Wrench (14, 17, 22mm)
Leakage Detector

●

Pipe Cutter

●

Tape ● Pliers ● Flare Tool

Putty

●

Knife

●

●

Gas

Vinyl

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

!

WARNING

●

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, television and inverter

INDOOR UNIT

type fluorescent lamp.

●

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

●

The installation height of indoor unit must be 2.3m or more in a
non public area.

Names of Indoor Components

QtyNo. Item

Hanger

1

Screw for Hanger

2

Holder for Remote
Controller

3

AAA Size Battery

4

Screw for holder of
Remote Controller

5

Remote Controller

6

Purifying Filter

7

Holder

8

(4.1x32)

(3.1x16)

1

6

1

2

2

1

1

1

Names of Outdoor Components

QtyNo. Item

Bush

9

Drain Pipe

0

Bush

!

2

1

1

The Length of Indoor Unit

Connecting Cord

Direction of Piping

There are 4 directions
allowed, namely, horizontally
perpendicular to the unit,
vertically down from right,
horizontally out from right and
horizontally out to left.
Don’t form the piping
downward at the left of the unit.

Dimension of Mounting Stand

of the Outdoor unit

(unit : mm)

above 100mm

above 700mm

●

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

●

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 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 flammable gas, steam, oil and
smoke.

OUTDOOR UNIT

●

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.

Figure showing the Installation
of Indoor and Outdoor Unit.

Be sure to
completely
seal any
gap with
putty.

above 200mm

above 50mm when
installed on the

(

ceiling of balcony

above

0.45m

must not bend

above 300mm

Maximum pipe length 15m

)

above 100mm

Minimum pipe length 5m

!

WARNING

!

CAUTION

above 50mm

Plug

above 100mm

give clearance as
wide as possible

above 200mm

•

2,300mm or more

4

5

3

CAUTION

The installation height

of indoor unit must be

2.3m or more in a non
public area.

2

1

above 100mm

6

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

● The difference in height

between the indoor and
outdoor unit should be
kept max 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 ø 16mm

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

1

Installation of Hanger, Wall Penetration and Installation of Protection Pipe

●

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.

60mm

Procedures of Installation and Precautions

●

Procedures to fix the hanger.

1.Drill holes on wall. 2. Push plug into the holes. 3. Fix the hanger on wall
(As shown below) (As shown below) with 4.1 x 32 screw

Wall

INDOOR UNIT

●

Procedures to fix the holder of remote control.

1.Drill holes on wall. 2. Push plug into the holes.
(As shown below) (As shown below)

Wall

Wall Penetration and Installation of Protection Pipe

●

Drill a ø 65mm 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.

<

I909: A

45mm

32mm

20mm

>

125mm

Screw for Hanger

Please use more
than 4 screws.

200mm

1 Hanger

2 Screw

3

Remote
Control
Holder

Seal with
putty

Protection
pipe

!

80mm

780mm

Wall

CAUTION

Mark

Plug

5 Screw

Plug

OutdoorIndoor

Seal with
putty

WALL

Sleeve of
protection
pipe

Line

above 50mm

2 ~ 5mm

125mm

280mm

45mm
115mm

450mm

Weight

Level

Hole for pipe

(As shown in figure below)

Ceiling

4.1 x 32 Screw

!

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.

Hanger

2

Installation of the Indoor Unit

VERTICALLY DOWNWARD PIPING

Preparation

●

Connect connecting cord.

●

Pull out the pipe, connecting cord and drain hose.

Installation

●

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.

Hanger

Protection
Pipe

Drain Hose

Refrigerating
Pipe

Connecting
Cord

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

1

2

Hanger

Projection

CAUTION

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.

HOW TO REMOVE INDOOR UNIT

●

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)

Push] mark positions

HORIZONTAL PIPING

Preparation

Change of Drain Hose and Installation Procedures.

●

Exchange the location of drain hose and drain cap during horizontal piping as shown in
figure 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).

Drain hoseDrain cap

!

CAUTION

Condensed water may leak out if not inserted properly.

HORIZONTAL & DOWNWARD PIPING – MAKING OPENINGS

●

During horizontal or downward piping, use a knife to cut
openings as shown in figure. Then smoothen the edges of
openings with a file.

Pipe
support

●

Pull up the pipe after
bending downward

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

INSTALLATION OF REFRIGERATING PIPES AFTER CONNECTION

●

The refrigerating pipes 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 electrical
cover. (Refer to “CONNECTION OF POWER CORD”)

●

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

!

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.

●

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

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.

●

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

 ” symbol.

0.85m

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 electrical 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.

Heat insulation pipe

Pull this to the front
during the connection

Connecting
cord

Refrigerating pipe

3

Installation of Drain Hose

of refrigerating pipes
to ease task.

Protection pipe

Drain hose

!

CAUTION

●

Please fix in the plastic core
after flaring to avoid plastic
chips entering the pipes.

Projection

about 15cm

Connecting cord

Connected section

Holder

Hook

CAUTION

Be sure that the
drain hose is not
loosely connected
or bend.

Bending
upwards

!

CAUTION

Condensed
water pond

Condensed
water pond

Ditch

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. (Carelessness may result in water leakage.)

●

Lo Hi

Sleeve of
protection pipe

Putty

Putty

Insulation material for pipe connection

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.

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

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

Pull downward

1

Preparation of Pipe

●

Use a pipe cutter to cut the copper pipe.

Trimming tool

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.

Die

Die

A

●

Please use exclusive
tool

Copper pipe

3

Removal Of Air From The Pipe And Gas Leakage Inspection

Procedures of using Vacuum Pump for Air Removal

When the meter reaches - 101KPa

As shown in right figure, remove the cap
of valve core. Then, connect the charge
hose. Remove the cap of valve head.

1

Connect the vacuum pump adapter to
the vacuum pump and connect the
charge hose to the adapter.

Fully tighten the “Hi” shuttle of the
manifold valve and completely unscrew
the “Lo” shuttle. Run the vacuum pump

2

for about 10–15 minutes, then completely
tighten the “Lo” shuttle and switch off
the vacuum pump.

(-76cmHg) during pumping, fully
tighten the shuttle.

Valve

When pumping starts, slightly loosen the
flare nut to check of air sucked in. Then
tighten the flare nut.

Meter showing pressure

Charge hose

Valve

Vacuum pump
adapter

Closed

R410A
Manifold valve

Vacuum
pump

CONDENSED WATER DISPOSAL OF OUTDOOR UNIT

 There are 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.

 At first 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

OUTDOOR UNIT

into the base. After installation, check whether the drain pipe cling to the
base firmly.

A

BASE

DRAIN PIPE

 When using in cold region, etc.

100 mm ABOVE

9

BUSH

In cold region with severe cold climate and heavy snow, water
discharged from heat exchanger freeze on the base surface and this
may affect drainage. In such a region, remove bush on the bottom face
of outdoor unit for better drainage. When using drainpipe, consult our
dealer.

11

10

DRAIN PIPE

BUSH

Outer
Diameter (mm)

6.35

9.52

2

Pipe Connection

For R410A tool

0.0

0.5mm

~

0.0 ~ 0.5mm

A (mm)

For R22 tool

1.0mm

1.0mm

In case of removing flare nut of an Indoor unit, first remove a nut

!

CAUTION

of small diameter side, or a seal cap of big diameter side will fly
out. Prevent water from entering into the piping when working.

●

Please be careful when bending the copper pipe.

●

Screw in manually while adjusting the center. After that, use of torque wrench to
tighten the connection.

INSTALLATION OF REFRIGERATING PIPES AND AIR REMOVAL

Wrench

Flare nut

Torque
wrench

Small dia. side

Large dia. side

Valve

head cap

Valve core cap

Small dia. side

Large dia. side

Outer

dia.of pipe

6.35 (1/4")

9.52 (3/8")

6.35 (1/4")

9.52 (3/8")

Torque N·m

(kgf · cm)

13.7 – 18.6 (140 – 190)

34.3 – 44.1 (350 – 450)

19.6 – 24.5 (200 ~ 250)

19.6 – 24.5 (200 ~ 250)

12.3 – 15.7 (125 ~ 160)

AIR REMOVAL

Completely unscrew the spindle of the
service valve (at 2 places) in anti-

3

clockwise direction to allow the flow of
coolant (using Hexagonal Wrench key).

Remove the charge hose and tighten the
cap of valve head. Check the cap’s

4

periphery if there is any gas leakage.
The task is then completed.

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.

Cap of valve head

The body of
service valve

Cap of
valve core

Hexagonal
Wrench Key

Cap of valve head

●

WARNING

!

THIS APPLIANCE MUST BE EARTHED.

Procedures of Wiring

In case that power is supplied from Indoor Unit

Indoor Unit

Line Cord

L

N

AC 220-240V

Connecting Cord

Power line Control line

30mm

10mm

Indoor

Unit

10mm

70mm

Strip wires

25mm

Outdoor

Unit

10mm

CONNECTION OF POWER CORD

GRN + YEL

●

The naked part of the wire core should be 10 mm and fix 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 power cables approved from the authorities in your country. For example in Germany:
Cable type: NYM 3x1.5mm

●

Please refer to the installation manual for wire connection to the terminals of the units. The cabling must
meet the standards of electrical installation.

●

There is an AC voltage drop between the L and N terminals if power is on. Therefore, before servicing,
be sure to remove the plug from the AC outlet or switch off the main switch.

10mm
35mm

!

WARNING

2

.

Outdoor Unit

2.0

1.6 or 2.0

30mm

10mm

GRN + YEL

25mm

10mm

Wiring Of The Indoor Unit

●

For wire connection of the Indoor unit, you need to remove low cover and front cover.

Method to remove front cover.

●

Refer to “FINAL STAGE OF INSTALLATION – How to Remove The Front Cover”.

Method to remove the low cover

●

Pull the cover at 1 and 2 in the directions as shown by arrows to
remove the cover.

DCBADCBA

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

Wiring of The Outdoor Unit

●

Please remove the side cover for wire connection.

●

If you cannot attach the side cover due to the connecting
cord, press the connecting cord in direction to the front

CD

B

A

Earth terminal

panel to fix it.

●

!

Be sure that the hooks of the side cover is fixed in
certainly. Otherwise water leakage may occur and this

WARNING

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

●

Investigate the power supply capacity and other electrical conditions at

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.

IMPORTANT

Cable length

up to 16m
up to 15m
up to 25m

Wire cross-section

1.6mm

2.5mm

4.0mm

2

2

2

the installation 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. In localities
where electrical conditions are poor, use of a voltage regulation is
recommended.

IMPORTANT

Fuse Capacity

15A time delay fuse

1

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 figure showing the installation of Indoor and
Outdoor units. Then fix 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.

3

Power Source And Operation Test

2

Installation Of Remote Controller

●

The remote controller can be placed in its holder which is
fixed on wall or beam.

●

To operate the remote controller at its holder, please ensure
that the unit can receive signal transmitted from the controller
at the place where the holder is to be fixed. The unit will beep
when signal is received from the remote controller. The signal
transmission is weaken by the fluorescent light. Therefore,
during the installation of the remote control holder, please
switch on the light, even during day time, to determine the
mounting location of the holder.

The controller must
be hooked onto the
hook at the lower
part of the holder.

Screw (2 pieces)

Push in the remote
controller in the
direction as shown
in figure below.

Remote

Controller

Holder for
Remote Controller

How to Remove The Front Cover

1 Remove the front panel.

●

Please remove and attach the front panel by both hands.

●

After opening the front panel by both hands.

11

1

Undo the right arm while pushing it inside.

11
22

2

Slide the front panel to right as shown in figure. Then

22

remove while pulling it to front.

2 Remove the filters.

3 After removing two screws, pull the center of the front

cover towards you and release the claws.

4 Pull the side faces (lower sections) of the front cover

towards you as shown in the figure and remove the
cover.

How to Attach the Front Cover

1 Check that the drain pan is securely attached.

2 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.

3 Tighten the two screws.

4 Install the filter.

5 Slide the shafts of the right and left arms on the washable

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.

Shaft

Power Source

FINAL STAGE OF INSTALLATION

●

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.

<

I909: A

Operation Test

●

!

CAUTION

Please ensure that the air conditioner is in normal
operating condition during the operation test.

●

Explain to your customer the proper operation

Hole

Step

procedures as described in the user’s manual.

>