Hitachi RAK-18NH6, RAK-25NH6, RAK-50NH6, RAK-35NH6 Installation Manual

above 50mm

above 100mm

above

0.45m

above 300mm

must not bend

above 100mm

2

6

4

5

3

8

Maximum pipe length

Refer to outdoor Installation Manual

Plug

2,300mm or more

1

SPLIT UNIT AIR CONDITIONER

INSTALLATION MANUAL

Indoor Unit

●

+ – 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

●

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

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

!

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.

●

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.

FOR SERVICE PERSONNEL ONLY

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.

INDOOR UNIT

Names of Indoor Components

Hanger

QtyNo. Item

The Length of Indoor Unit

Connecting Cord

Figure showing the Installation of Indoor Unit.

1

Screw for holder of
Remote Controller

(3.1x16)

AAA Size Battery

Holder for Remote
Controller

(4.1x32)

Remote Controller

Purifying Filter

2

6

3

1

4

2

5

2

6

7

8

1

1

Screw for Hanger

0.9m

1.6m

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 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.

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.

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

(As shown in figure below)

●

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)

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
installation may cause
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
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).

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

!

CAUTION

●

Please fix in the plastic core
after flaring 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 flow 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

<

IA194: A

>

32mm

20mm

ø4.8mm

ø4.4mm

Wall

1 Hanger

2 Screw

Plug

Wall

above 50mm

Ceiling

4.1 x 32 Screw

Wall

Remote
Control
Holder

5 Screw

Plug

3

Sleeve of
protection
pipe

WALL

Protection
pipe

Seal with
putty

Seal with
putty

2 ~ 5mm

OutdoorIndoor

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

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

Hanger

Refrigerating
Pipe

Protection
Pipe

Drain Hose

Connecting
Cord

Hanger

1

Projection

2

!

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.

●

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

Drain hoseDrain cap

Drain cap

Please insert
until here

Drain hose

Please insert
until here

Pipe
support

Pull up the pipe after
bending downward

Openings

Pipe

Connecting
cord

Drain hose

Pipe

Rubber strap tied with great force

below
5mm

Please bend at a small
radius to form an arc

about 15cm

Hook

Projection

Protection pipe

Connecting cord

Holder

Connected section

Drain hose

H

IT

A

C

H

I

Heat insulation pipe

Connecting
cord

Refrigerating pipe

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

Bending
upwards

Condensed
water pond

Ditch

Condensed
water pond

Holder

1

0.85m

RAK-18NH6
RAK-25NH6
RAK-35NH6
RAK-50NH6

!

CAUTION

•

The installation height of indoor

unit must be 2.3m.

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.

Connection

Horizontally
perpendicular
to the unit

Be sure to
completely
seal any
gap with
putty.

The connection of insulated drain hose.

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

inner diameter ø 16mm

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

HFC

R410A

1

125mm

45mm

200mm

60mm

80mm

780mm

125mm

280mm

45mm
115mm

450mm

Level

Hanger

Hole for pipe

Weight

Mark

Line

Please use more
than 4 screws.

Screw for Hanger

[Push] mark positions

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)

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

8

Holder

Removal Of Air From The Pipe And Gas Leakage Inspection

FINAL STAGE OF INSTALLATION

Insulation And Maintenance Of Pipe Connection

1

●

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.

Installation Of Remote Controller

2

Power Source And Operation Test

3

●

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.

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.

Operation Test

●

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.

<

IA194: A

>

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.

3

Procedures of using Vacuum Pump for Air Removal

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.

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.

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).

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.

Preparation of Pipe

1

●

Use a pipe cutter to cut the copper pipe.

Pipe Connection

2

INSTALLATION OF REFRIGERATING PIPES AND AIR REMOVAL

AIR REMOVAL

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.

●

THIS APPLIANCE MUST BE EARTHED.

Procedures of Wiring

In case that power is supplied from Indoor Unit

CONNECTION OF POWER CORD

WARNING

!

●

Recommend to use
R410A flaring tool.

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.

Copper pipe

Trimming tool

A

Die

Die

Copper pipe

Wrench

Torque
wrench

Flare nut

Sleeve of
protection pipe

Putty

Putty

Insulation material for pipe connection

Remote

Controller

Holder for
Remote Controller

Screw (2 pieces)

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”.

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

Outer
Diameter (mm)

6.35

9.52

12.7

For R410A tool

0.0 ~ 0.5mm

0.0

~

0.5mm

0.0

~

0.5mm

For R22 tool

A (mm)

1.0mm

1.0mm

1.0mm

●

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.

CAUTION

!

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")

Valve

head cap

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)

Small dia. side

Large dia. side

Valve core cap

Small dia. side

Large dia. side

The body of
service valve

Cap of

valve core
Hexagonal
Wrench Key

Cap of valve head

Cap of valve head

1

2

3

4

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).

GRN + YEL

Strip wires

30mm

10mm

10mm

70mm

●

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 3x1.5mm2.

●

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.

WARNING

!

IMPORTANT

Cable length

up to 16m

up to 15m

up to 25m

Wire cross-section

1.5mm

2

2.5mm

2

4.0mm

2

Indoor Unit

Connect the
earth cord

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

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

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

11

1

Undo the right arm while pushing it inside.

22

22

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.

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.

HITACHI

D

C

IN

V

E

RT

E

R

Step

Shaft

Hole

H

ITACH

I

D

C

IN

V

E

R

T

E

R

Lo Hi

Stop valve

Charge hose

Stop
valve

Vacuum pump adapter

Meter showing pressure

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

Closed

Vacuum pump

R410A Manifold valve

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