FOR SERVICE PERSONNEL ONLY

●

●

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

HFC

R410A

RAK-18NH6

RAK-25NH6

RAK-35NH6

RAK-50NH6

Tools Needed For Installation Work

● + – Screwdriver ● Measuring Tape ● Knife

● Saw ● ø 65mm Power Drill ● Hexagonal Wrench

Key ( 4mm) ● Wrench (14, 17, 22, 26, 27mm)

● Gas Leakage Detector ● Pipe Cutter ● Putty

● Vinyl Tape ● Pliers ● Flare Tool

●

●

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 R-410A. Otherwise, this may result in broken copper pipes or faults.

When installing or removing an air conditioner, only specified 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 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 (16A time delay) 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.

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 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.

Names of Indoor Components

No.

Item Qty

Hanger

1 1

2

Screw for Hanger

( 4 . 1 x 3 2 )

3

Holder for Remote

Controller

6

1

4

AAA Size Battery

2

5

Screw for holder of

Remote Controller

( 3 . 1 x 1 6 )

Remote Controller

6

2

1

7

Purifying Filter

1

8

Holder

1

The Length of Indoor Unit

Connecting Cord

0.9m

1.6m

Direction of Piping

Horizontally perpendicular to the unit

Connection

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.

Figure showing the Installation of Indoor Unit.

Be sure to completely seal any gap with putty.

above 100mm above 50mm

1

!

CAUTION

•

The installation height of indoor unit must be 2.3m.

8

2,300mm or more

2 above 100mm

6

Plug

3

5

4

●

●

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.

inner diameter ø 16mm

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 commersial products).

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

45mm

60mm

125mm

!

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.

200mm

80mm

780mm

125mm

45mm

115mm

Level

450mm

Hanger

2 Installation of the Indoor Unit

VERTICALLY DOWNWARD PIPING

Preparation

●

●

Connect connecting cord.

Pull out the pipe, connecting cord and drain hose.

●

●

Installation

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

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

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

Protection

Pipe Drain Hose Connecting

Cord

2

1

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.

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.

!

Pipe

Connecting cord

CAUTION

Drain hose

8 Holder

● 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.

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

● Holder can be attached at the either of 2 places.

Please select the easier position.

Pipe Rubber strap tied with great force

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.

!

CAUTION

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

Screw for Hanger

Please use more than 4 screws.

Mark

Line

Weight

Hole for pipe

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

Procedures of Installation and Precautions

● Procedures to fix the hanger.

1. Drill holes on wall.

2. Push plug into the holes.

(As shown below) (As shown below)

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

(As shown in figure below)

Ceiling

Wall above 50mm

1 Hanger

2 Screw

Plug

32mm

Wall

● Procedures to fix the holder of remote control.

1. Drill holes on wall.

(As shown below)

2. Push plug into the holes.

(As shown below)

Wall

3 Remote

Control

Holder

5 Screw

20mm

Plug

4.1 x 32 Screw

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.

Indoor

Seal with putty

Protection pipe

WALL

Outdoor

2 ~ 5mm

Seal with putty

Sleeve of protection pipe

!

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.

Refrigerating pipe

Connecting cord

H

C

H I below

5mm

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).

Please bend at a small radius to form an arc

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.

Projection

Drain cap Drain hose

Heat insulation pipe

Protection pipe

Drain hose

Drain cap

Please insert until here

Drain hose

Please insert until here

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

about 15cm

Hook

Connecting cord

Holder Connected section

3 Installation of Drain Hose

!

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

Openings

Pull up the pipe after bending downward

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

Ditch

Condensed water pond

!

CAUTION

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

!

Bending upwards

CAUTION

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. (Carelessness may result in water leakage.)

< IA194: A >

1 Preparation of Pipe

● Use a pipe cutter to cut the copper pipe.

Copper pipe

Trimming tool

!

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

Outer

Diameter (mm)

6.35

9.52

12.7

Copper pipe

● Recommend to use

R410A flaring tool.

For R410A tool

0.0 ~ 0.5mm

0.0 ~ 0.5mm

0.0 ~ 0.5mm

A (mm)

For R22 tool

1.0mm

1.0mm

1.0mm

2 Pipe Connection

!

CAUTION

In case of removing flare nut of an

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

Flare nut

Wrench Torque wrench

Small dia. side

Large dia. side

Valve head cap

Small dia. side

Large dia. side

Valve core cap

Outer dia.of pipe

6.35 (1/4")

9.52 (3/8")

12.7 (1/2")

6.35 (1/4")

9.52 (3/8")

12.7 (1/2")

Torque N·m

(kgf · cm)

13.7 – 18.6 (140 – 190)

34.3 – 44.1 (350 – 450)

44.1 – 53.9 (450 – 550)

19.6 – 24.5 (200 ~ 250)

19.6 – 24.5 (200 ~ 250)

29.4 – 34.3 (300 – 350)

12.3 – 15.7 (125 ~ 160)

3 Removal Of Air From The Pipe And Gas Leakage Inspection

Procedures of using Vacuum Pump for Air Removal

1

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.

2

Fully tighten 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.

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

Stop valve

Charge hose

Meter showing pressure

Closed

Lo Hi

R410A Manifold valve

Vacuum pump

Stop valve

3

Completely unscrew the spindle of the service valve (at 2 places) in anti-clockwise direction to allow the flow of coolant (using Hexagonal Wrench key).

4

Remove the charge hose and tighten the cap of valve head. Check the cap’s periphery if there is any gas leakage. The task is then completed.

Vacuum pump adapter

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

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. (Use the detector provided for

R410A).

The body of service valve

Cap of valve head

Cap of valve core

Hexagonal

Wrench Key

Cap of valve head

!

WARNING

● THIS APPLIANCE MUST BE EARTHED.

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

Procedures of Wiring

In case that power is supplied from Indoor Unit

Indoor Unit

30mm

10mm

Wiring Of The Indoor Unit

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

Method to remove front panel

● 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.

D

C

Connect the earth cord

10mm

70mm

GRN + YEL

Strip wires

!

WARNING

● 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

2 .

● 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 a AC voltage of 230V between the L and N terminals. Therefore, before servicing, be sure to remove the plug from the AC outlet or switch off the main switch.

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

Checking for the electric source and 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.

Cable length Wire cross-section

IMPORTANT

up to 1 6m up to 15m up to 25m

1.5mm

2

2.5mm

2

4.0mm

2

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.

Insulation material for pipe connection

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.

How to Remove The Front Cover

●

1 Remove the front panel.

Please remove and attach the front panel by both hands.

HITACHI

DC INVERTER

Sleeve of protection pipe

Putty

Putty

3 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.

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

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

Operation Test

Remote

Controller

Screw (2 pieces)

Holder for

Remote Controller

●

●

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.

●

1

After opening the front panel by both hands.

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.

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.

1

How to Attach the Front Cover

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

HITACHI

DC INVERTER

Hole Step

< IA194: A >