background image

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 speci

fi

 ed  in 

fi

 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 

fl

 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.

INDOOR UNIT

 The difference in height 

between the indoor and 
outdoor unit should be 
kept max 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).

Be sure to 
completely 
seal any 
gap with 
putty.

Installation of Hanger, Wall Penetration and Installation of Protection Pipe

1

CAUTION

!

 The draining of the water container inside the indoor unit can be done from the 

left. Therefore the hanger must be 

fi

 xed horizontally or slightly tilted towards the 

side of drain hose. Otherwise, condensed water may over

fl

 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

  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.

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.

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

fi

 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 

fi

 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, 

fi

 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 

fi

 xing 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 

fi

 x in the plastic core 

after 

fl

 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 

fl

 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

<

IA819: B 

>

HOW TO REMOVE INDOOR UNIT FROM HANGER

  Pull down PULL section on the bottom of indoor 

unit and pull it towards you, then claws are 
released from hanger. (Indicated by 2 arrows 
in the drawing on the right.)

 When bottom face of indoor unit cannot be 

 

pulled due to obstacles, etc. Remove front cover, 
insert screw driver into circle hole, pull claws 
down and pull indoor unit towards you.

 Please check how to remove and attach front 

cover in this instruction manual.

!

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 

fi

 gure. Then smoothen the edges of 

openings with a 

fi

 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.

Names of Indoor Components

Hanger

Qty

No.

Item

Figure showing the Installation 
of Indoor and Outdoor Unit.

1

Screw for holder of 
Remote Controller

( 3 . 1 x 1 6 )

AAA Size Battery

Direction of Piping

Dimension of Mounting Stand

of the Outdoor unit

(unit : mm)

Holder for Remote 
Controller

T h e r e   a r e   6   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.

( 4 . 1 x 3 2 )

Remote Controller

Purifying Filter

6

1

2

2

1

2

Screw for Hanger

3

Bush

Names of Outdoor Components

Qty

No.

Item

Drain Pipe

1

Bush

Bush

1

Procedures of Installation and Precautions

 Procedures to 

fi

 x 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

    

   

(As shown in 

fi

 gure  below)

 Procedures to 

fi

 x the holder of remote control.

1. Drill holes on wall. 

2. Push plug into the holes.

  (As shown below) 

  (As shown below)

HITACHI SPLIT-UNIT AIR CONDITIONER 

INSTALLATION MANUAL

 

Indoor Unit 

 

Outdoor Unit

 RAS-50YHA3    RAC-50YHA3

FOR SERVICE PERSONNEL ONLY

● 

  +    –   

Screwdriver 

   

 Measuring Tape 

   

● 

 Knife   

 Saw  

 

 Pipe Cutter 

 Hexagonal Wrench Key (

 4mm)

 

 Power Drill (ø 65mm ~ ø 80mm)   

 Vacuum Pump 

 Pliers or Wrench  

 Torque Wrench   

 Vacuum 

Pump Adaptor   

 Flare Tool   

 Gas Leakage Detector 

 Manifold Valve  

 Charge Hose   

 Reammer   

 File  

 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

!

  A circuit breaker or fuse (16A time delay) must be installed. Without a circuit breaker or fuse the danger of electric 

 shock 

exists.

 

The external switch shall be incorporated to completely disconnect from power supply. It should disconnect all poles, and a 
contact separation of at least 3mm must be present.

  Do not install the unit near a location where there is 

fl

 ammable gas. The outdoor unit may catch 

fi

 re  if 

 

fl

 ammable gas leaks around it.

●   

Do not install the indoor unit in a machine shop or kitchen where vapor from oil or its mist 

fl

 ows to the indoor unit. The oil 

will deposit on the heat exchanger, thereby reducing the indoor unit performance and may deform and in the worst case, 
break the plastic parts of the indoor unit.

  Please ensure smooth 

fl

 ow of water when installing the drain hose.

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

CAUTION

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, front and back 

are speci

fi

 ed  in 

fi

 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 

fl

 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.

 Do not install the outdoor unit in a place where small animals 

may build their nests. If small animal goes inside the unit and 
touches the electrical parts, failure of the unit, smoke or 

fi

 re may 

be caused. Request your customer to keep the surrounding of 
the unit clean.

OUTDOOR UNIT

WARNING

!

  Please request your sales agent or quali

fi

 ed technician to install your unit. Water leakage, short circuit or 

fi

 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 

fi

 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

fi

 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 

fi

 re.

  Please use the speci

fi

 ed components for installation work. Otherwise, the units may collapse or water leakage, electric shock 

and 

fi

 re may occur.

  Be sure to use the speci

fi

 ed piping set for R410A. Otherwise, this may result in broken copper pipes or faults.

  When installing or removing an air conditioner, only speci

fi

 ed refrigerant (R410A) shall be allowed, 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 

fi

 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 

fi

 re in the fan-driven heater, space heater, etc., a poisonous gas may occur.

 Unauthorized modi

fi

 cations to the air conditioner may be dangerous. If a breakdown occurs please call a quali

fi

 ed  air 

conditioner technician or electrician. Improper repairs may result in water leakage, electric shock and 

fi

 re,  etc.

  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.

SAFETY PRECAUTION

!

!

Refrigerant pipe size (outer diameter):  Narrow pipe, Liquid (ø6.35mm) ; Wide pipe, Gas (ø12.70mm)

INS RAS-RAC-50YHA3 DD0004545A (1)   1

3/28/12   4:27 PM

Reviews: