Hitachi RAC-08LH1 Installation Manual Download Page 1

Plug

Maximum pipe length

RAC-08LH1 : 10m

RAC-10LH1 : 10m

RAC-14LH1 : 15m

4

5

3

6

1

2

Be sure to 
completely 
seal any gap.

The difference in height
between the indoor and
outdoor unit should be
kept ma

x

 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).

The connection of insulated 
drain hose.

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

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

SPLIT UNIT AIR CONDITIONER 

INSTALLATION MANUAL

   Indoor Unit   

Outdoor Unit

    RAS-08LH2/RAS-08LH2(B) RAC-08LH1
  RAS-10LH2/RAS-10LH2(B) 

RAC-10LH1

  RAS-14LH2/RAS-14LH2(B) 

RAC-14LH1

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

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

SAFETY PRECAUTION

!

!

!

!

A circuit breaker or fuse must be installed. Without a circuit breaker or fuse the danger of electric shock e

x

ists.

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  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.

Piping shall be suitable supported with a ma

x

imum spacing of 1m between the supports.

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 instructions 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 power cables approved by the authorities of your country.

Be sure to use the speci 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  re.

Please use the speci ed components for installation work. Otherwise, the units may collapse or water leakage, electric shock
and  re 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 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  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.

FOR SERVICE PERSONNEL ONLY

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.

!

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

!

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

  The clearance distances from top, right and left are speci ed in  gure

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 type
 uorescent  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.

!

Do not e

x

pose 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 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  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.

INDOOR UNIT

Names of Indoor Components

Hanger

Qty

No.

Item

The Length of Indoor Unit 

Connecting Cord

Figure showing the Installation of Indoor and Outdoor Unit.

OUTDOOR UNIT

1

1

Screw for holder of 
Remote Controller

( 3 . 1

x

1 6 )

AAA Size Battery

Direction of Piping

Holder for Remote 
Controller

T h e r e   a r e   4   d i r e c t i o n s 
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.

( 4 . 1

x

3 2 )

Remote Controller

Purifying Filter

2

6

3

1

4

2

5

2

6

7

9

2

1

Screw for Hanger

Names of Outdoor Components

Qty

No.

Item

Drain Pipe

1

Connection

!

CAUTION

 The installation height of indoor 

unit must be 2.3m or more.

8

Holder

1

Installation of Hanger, Wall Penetration and Installation of Protection Pipe

1

!

The draining of the water container inside the indoor unit can be done from the
left. Therefore the hanger must be  

x

ed horizontally or slightly tilted towards the

side of drain hose. Otherwise, condensed water may over ow the water container.

Direct Mounting On The Wall

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

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.

   Installation of the Indoor Unit

2

VERTICALLY DOWNWARD PIPING

Please pull the lower part of 
the Indoor unit outwards to 
check if the unit is hooked 
onto the hanger. Improper 
i n s t a l l a t i o n   m a y   c a u s e 
vibration and noise.

!

CAUTION

HORIZONTAL PIPING

  Preparation

Change of Drain Hose and Installation Procedures.

E

x

change the location of drain hose and drain cap during horizontal piping as shown in

 gure 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).

INSTALLATION OF REFRIGERATING PIPES AFTER CONNECTION

The refrigerating pipes should be adjusted to  t 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,  t 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
 

x

ing 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

!

CAUTION

Please  

x

 in the plastic core

after  aring to avoid plastic
chips entering the pipes.

CAUTION

!

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

!

CAUTION

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

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.

!

WARNING

The refrigerating pipes and connecting cord
transform and are attached.

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

 ” symbol.

   Installation of Drain Hose

3

  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.

INDOOR UNIT

<

IA857: A

>

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  gure)

!

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  gure. Then smoothen the edges of
openings with a  le.

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

Heat insulation pipe

Connecting
cord

Refrigerating pipe

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

CAUTION

Dimension of Mounting Stand

of the Outdoor unit

(unit : mm)

CAUTION

  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.

WARNING

WARNING

CAUTION

CAUTION

WARNING

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. E

x

plain to customer the proper way of 

operating the unit as described in the user’s guide.

Procedures of Installation and Precautions

Procedures to  

x

 the hanger.

1. Drill holes on wall. 

2. Push plug into the holes.

3. Fi

x

 the hanger on wall

(As shown below)

(As shown below) 

with 4.1 

x

 32 screw

(As shown in  gure below)

Procedures to  

x

 the holder of remote control.

1. Drill holes on wall. 

2. Push plug into the holes.

(As shown below)

(As shown below)

+  –  Screwdriver

Measuring Tape

Knife

Saw

ø 

65mm Power Drill

He

x

agonal Wrench

Key (    4mm)  

Wrench (14, 17, 22mm)

Gas

Leakage Detector  

Pipe Cutter

Putty

Vinyl

Tape  

Pliers

Flare Tool

Vacuum pump

● 

File 

 Manifold Valve

Charge Hose

Reamer

  

TOOLS NEEDED FOR INSTALLATION WORK

!

In case the pipe length is more than the recommended length 
for chargeless, add refrigerant R410A as below. Do not e

x

ceed 

the ma

x

imum pipe length.

CAUTION

Model

Ma

x

. Pipe Chargeless up to

Additional R410A

RAC-08LH1
RAC-10LH1
RAC-14LH1

5gram / meter
5gram / meter

20gram / meter

10m
10m
15m

5m
5m
8m

(EN1) INS RAS-8-10-14LH2(B)   1

3/20/12   9:56 AM

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