Hitachi RAK-18QXB, RAK-35RXB, RAK-25RXB, RAK-50RXB Installation manual

FOR SERVICE PERSONNEL ONLY

INDOOR UNIT

RAK-18QXB

MODEL

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.

• 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.

RAK-25RXB RAK-35RXB RAK-50RXB

WARNING

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.

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

full support to the unit.

provide

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

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,

•

put the controller far away from high-frequency machines and high-power

wireless systems.

size Battery

AAA

from the floor.

The installation height should be at least 2300 mm or more

•

Be sure to completely seal any gap with putty.

about 450mm

dneb ton tsum

mm003 tuoba

Figure showing the Installation

above

50mm

Th e i nd oo r p ip ing sh oul d be i ns ula te d wi th th e e ncl os ed insulation pipe. (If the

insulator is insufficient,

please use commercial

products.)

Plug

above

50mm

2300 mm or more

of Indoor Unit.

Names of Indoor Components

No. Item Qty

Hanger

Screw for Hanger

Remote Controller

Wasabi-Nano Titanium Air Cleaning Mesh

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.

C-case

Remote Controller Holder

Screw for Remote

Controller Holder

Insulation sheet

below.

please

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.

Installation Of Remote Controller

Direct Mounting On The Wall

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

Visible outline of the outdoor unit

100

42.5

180

Line

Level

Weight

668

550

Wall hole

100

160

115

Screw for Hanger

Hanger

193

Drain Hose

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.

Wall Penetration and Installation of Protection Pipe

Procedures of Installation and Precautions

• Procedures to fix the hanger.

1.Drill holes on wall.

(As shown below)

Wall

32mm

ø mm8.4

• Procedures to fix the holder of remote control. Drill holes on wall.

Wall

ø mm4.4

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

Hanger

Screw

Wall

(As shown below)

20mm

3.Fix the hanger on with 4.1 x 32 screw.

Plug (Procure locally)

Push plug into the holes.

Remote

Control Holder

(As shown in figure below)

Plug (Procure locally)

Ceiling

(As shown below)

Screw

wall

•

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 of

the holder

• Drill a ø65mm hole on wall which is

Screw (2 pieces)

Remote Controller

Remote Controller Holder

The remote controller must be slide in the remote controller holder, in the direction as shown in the figure, until it hooks at the lower end of the remote controller holder.

Indoor

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

•

Seal with putty

location

Outdoor

2-5mm

Seal with putty

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

Protection pipe

WALL

Sleeve of protection pipe

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.

2 Installation Of The Indoor Unit

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

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

Preparation

•

Connect connecting cord.

•

Pull out the pipe, connecting cord and drain hose.

Connecting cords, pipe and drain hose must be laid

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.

Hanger

Refrigerating Pipe

Protection Pipe

Drain Hose

Connecting Cord

together with Vinyl tape.

Cable

Drain layout of backward piping

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

Wall hole

Pipe

Drain hose

Hanger

Projection

RAK-15QPB/RAK-18_25RPB_IM_English

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.

INSTALLATION OF REFRIGERATING PIPES AND AIR REMOVAL

1 Preparation of Pipe

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

Trimming tool

Copper pipe

• 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

Drain cap

Drain Hose

Remove low cover

•

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

•

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

CAUTION

•

The rubber strap used for fixing the insulator should not

t eb ied with great force. Otherwise,this will damage heat

insulation and causes water condensation.

Pipe

Rubber strap tied with great force

• 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

of pipe-support by hand.

lower portion

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.

Pipe

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

Drain hose

Connecting cord

THE CONNECTION OF REFRIGERATING PIPE DURING THE INSTALLATION OF INDOOR UNIT

Preparation To Install Refrigerating Pipes

• The refrigeratin g p ipes and connecti ng cor d

transform and are attached.

Installation

Hang the indoor unit onto the hanger. Use the temporar 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.

Wall hole

Pipe

Cable

Drain layout of backward piping from left

Drain hose

Connecting

cord

3 Heat Insulation and Finish of the Piping

• 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 a ny cleara nc e or over-tightening may cau se 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.

4 Installation of Drain Hose

Please bend at a small radius to form an arc

Refrigerating pipe

Heat insulation pipe

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

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

” symbol.

y stand

Projection

about 15cm

Protection

pipe

Drain hose

Connecting cord

Insulation material for pipe connection

Sleeve of protection pipe

Putty

below

5mm

Hook

Connected section

Putty

CAUTION

Bending upwards

CAUTION

Ditch

Condensed water

pond

Condensed water

pond

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.)

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

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

CAUTION

Wrench

• 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.

• Before flaring, please put on the flare nut.

Die

• Please use exclusive tool for

Copper pipe

refrigerant R410A.

Outer A (mm) Rigid Flaring Tool

Small diameter side

Large diameter side

Valve head cap

Small diameter side

Large diameter side

Valve core cap

Outer diameter

of pipe (ø)

6.35 (1/4”) 13.7 – 18.6 (140 – 190)

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

0 - 0.5 1.012.7 (1/2")

2 Pipe Connection

CAUTION

Gas leakage inspection

Please use gas leakage detector to check if

leakage

occurs at

as shown in below.

further tighten the connection

connection of Flare nut

If gas leakage occurs,

• 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.

DROC REWOP FO NOITCENNOC

ler

CN21

CN6

WARNING

• THIS APPLIANCE MUST BE EARTHED.

Detail of Cutting the Connecting Cord

Indoor Unit

70mm

10mm

Strip wires

10mm

45mm

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.

Wiring of The Indoor Unit

•

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

•

Remove the cover from the terminal base and screw the cable.

low cover under the body of the unit and terminal cover.

Earth

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

Green + Yellow (ground)

Connecting cord

Cord band

Method to remove the low cover

•

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

How to connect the optional parts

(H-LINK RAC Adapter, Dry contact, Wired Remote Controller)

• For cable connection to control P.W.B., you need to remove front cover and electrical box cover.

Each connecting location is as below.

Dry contact: CN6

H-LINK RAC Adapter：CN7

Wired Remote Control : CN20

• Please check and confirm manuals attached to each optional parts for more connection details.

• You can refer to this installation manual how to remove and re-attach the front cover.

• Please be careful not to damage lead wires by edge of plate when connecting the optional parts.

CN20

CN7

FINAL STAGE OF INSTALLATION

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

Remove the front panel

• Please remove and attach the front panel by



Shaft

Hole



both hands.

• After opening the front panel by both hands.

Undo the right arm while pushing it inside.

Slide the front panel to right as shown in figure. Then remove while pulling it to front.

Remove the filters.

After removing three screws, pull the center of the front cover

Pull the side faces (lower sections) of the front

and release the claws.

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

Screw

ECO Sensor

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 three screws.

Install the filter.

4 5

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.





Shaft Hole

CAUTION

Remove and attach the front cover to the direction as shown in the figure to ensure no damage occurs to the ECO sensor.

Torque wrench

44.1 – 53.9 (450 – 550)

)”2/1( 7.21

12.3 – 15.7 (125 – 160)

to stop leakage.

CN7

CN6

Torque N·m

(kgf·cm)

)054 – 053( 1.44 – 3.43 )”8/3( 25.9

)052 – 002( 5.42 – 6.91 )”4/1( 53.6 )052 – 002( 5.42 – 6.91 )”8/3( 25.9 )053 – 003( 3.43 – 4.92 )”2/1( 7.21

RAK-15QPB/RAK-18_25RPB_IM_English