Hitachi RAC-35NH5, RAC-50NH5, RAC-25NH5 Installation Manual

CONDENSED WATER DISPOSAL OF OUTDOOR UNIT

 There are holes on the base of Outdoor unit for condensed

water to exhaust.

 In order to flow condensed water to the drain, the unit is installed on

a stand or a block so that the unit is 100mm above the ground as
shown figure. Join the drain pipe to one hole.

 At first insert one portion of the hook to the base (Portion A), then

pull the drain pipe in the direction shown by the arrow while inserting
the hook into the base. After installation, check whether the drain
pipe cling to the base firmly.

When Using and Installing In Cold Areas

When the air conditioner is used in low temperature and in snowy
conditions, water from the heat exchanger may freeze on the base
surface to cause poor drainage. When using the air conditioner in such
areas, do not install the bushings. Keep a minimum of 250mm between
the drain hole and the ground. When using the drain pipe, consult your
sales agent.

For more details, refer to the installation Manual for Cold Areas.

Maximum pipe length 20m

above 200mm

above 700mm

above 200mm

above 50mm when
installed on the
ceiling of balcony

(

)

above 100mm

above 100mm

give clearance as
wide as possible

SPLIT UNIT AIR CONDITIONER

INSTALLATION MANUAL

RAC-25NH5

Outdoor Unit RAC-35NH5

RAC-50NH5

●

+

– 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 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 and front are specified in figure 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 flammable 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.

OUTDOOR UNIT

Dimension of Mounting Stand

of the Outdoor unit

(unit: mm)

● 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).

inner diameter ø 16mm

Names of Outdoor Components

Drain Pipe

1

57

12
35

124

500

320

10

20

(10)

340

mounting stand

Dimension of Mounting Stand

of the Outdoor unit

(unit: mm)

57

12
35

198

508

320

10

35

(10)

340

mounting stand

(RAC-25NH5,
RAC-35NH5)

(RAC-50NH5)

●

Please mount the Outdoor unit on stable ground to prevent
vibration and increase of noise level.

●

Decide the location for piping after sorting out the different types
of pipe available.

●

When removing side cover, please pull the handle after undoing
the hook by pulling it downward.

Please face this side (suction
side) of the unit to the wall.

Please remove side cover
when connecting the piping
and connecting cord.

Pull downward

BASE

DRAIN PIPE

A

DRAIN PIPE

BUSH

100 mm ABOVE

11

10

BUSH

12

Figure showing the Installa­tion of Outdoor Unit.

2

3

Bush

QtyNo. Item

(RAC-25NH5,
RAC-35NH5)

(RAC-50NH5)

HFC

R410A

<

I867: A

>

Bush

1

10

11

12

(EN) INS RAC-25/35/50NH5 20/10/05, 9:14 AM1

Removal Of Air From The Pipe And Gas Leakage Inspection

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)

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.

2

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

3

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.

1

Preparation of Pipe

1

●

Use a pipe cutter to cut the copper pipe.

●

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.

Pipe Connection

2

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)

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)

Small dia. side

Large dia. side

Valve core cap

AIR REMOVAL

●

Recommend to use
R410A flaring tool.

Small dia. side

Large dia. side

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.

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

Meter showing pressure

Closed
R410A

Manifold valve

Vacuum
pump

Valve

Charge hose

Valve

Vacuum pump
adapter

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

Copper pipe

Trimming tool

A

Die

Die

Copper pipe

1.0mm

1.0mm

1.0mm

Wrench

Torque
wrench

Flare nut

Lo Hi

The body of
service valve

Cap of

valve core
Hexagonal
Wrench Key

Cap of valve head

Cap of valve head

4

WARNING

●

If you cannot attach the side cover due to the connecting cord,
press the connecting cord in direction to the front panel to fix it.

●

Be sure that the hooks of the side cover is fixed in certainly.
Otherwise water leakage may occur and this causes short circuit
or faults.

●

The connecting cord should not touch to service valve and pipes.
(It becomes high temperature in heating operation.)

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.

●

Investigate the power supply capacity and
other electrical conditions at the installation
location.
Depending on the model of room air
conditioner to be installed, request the
customer to make arrangements for the
necessary electrical work etc.
The electrical work includes the wiring work
up the outdoor. In localities where electrical
conditions are poor, use of a voltage
regulation is recommended.

●

THIS APPLIANCE MUST BE EARTHED.

Procedures of Wiring

Wiring of The Outdoor Unit

●

Please remove the side cover for wire connection.

!

WARNING

!

In case that power is supplied from Outdoor Unit

Earth terminal

N

CD

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

DCNLDC

Indoor Unit Outdoor Unit

Connecting Cord

Connecting Cord

AC 220 - 230V

1.6 or

2.0

2.0

L

●

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.

WARNING

!

Outdoor

Unit

GRN + YEL

Strip wires

25mm

25mm

10mm

10mm

10mm

35mm

Cable length

up to 16m

up to 15m

up to 25m

Wire cross-section

1.5mm

2

2.5mm

2

4.0mm

2

IMPORTANT

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.

Power Source And Operation Test

2

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.

Sleeve of
protection pipe

Putty

Putty

Insulation material for pipe connection

<

I867: A

>

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.

Power line Control line

Use 16A Time
Delay Fuse

(EN) INS RAC-25/35/50NH5 20/10/05, 9:14 AM2