Hitachi RAC-25WXA Installation Manual Download Page 2

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WARNING

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THIS APPLIANCE MUST BE
EARTHED.

Procedures of Wiring

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When power supplies to Outdoor Unit

Wiring of The Indoor Unit

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

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Pull at the 

 and 

 in the directions as shown by

arrows to remove the cover.

Method to remove the low cover

Wiring of the Outdoor Unit

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Please remove the side cover for wire connection.

Checking for the electric source and the voltage range

IMPORTANT

Wire length  Wire gauge

up to   6m 

1.6mm

2

up to 15m 

2.5mm

2

up to 20m 

4.0mm

2

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cover

Earth terminal

IMPORTANT

Fuse Capacity

16A time 

delay fuse

 WARNING

 WARNING

 1          2

The naked part of the wire core should be 10mm 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 wire specified for the use of air-
conditioner.
Please refer to the manual for wire connection and the 
wiring technique should meet the standard of the electrical 
installation.
There is an AC voltage drop between the LN terminal if the 
power is on. Therefore, be sure to remove the plug from its 
socket.

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. 

For wire connection of the Indoor unit, you need to remove the 
front cover, the low cover under the body of the unit and 
terminal cover.

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 WARNING

If you cannot attach the side plate due to the connection 
cord,  please press the connecting cord in the direction to 
the front panel to fix it.
Be sure that the hooks of the side cover 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.)

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Before installation, the power source must be checked and 
necessary wiring work must be completed. To make the wiring 
capacity proper, use the wire gauge list below for the wiring 
from house distribution fuse box to the outdoor unit in consider-
ation of the blocked rotor current.

Investigate the power supply capacity 
and  other electrical conditions at the 
installing location.
Depending on the model of room air condi-
tioner 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 unit. In localities 
where  electrical  conditions are poor, use of 
a voltage regulation is recommended.
Install outdoor for the room air conditioner 
within the reaching range of the line cord.

Wired remote controller

RAC Adapter

WIRED REMOTE CONTROLLER

H-LINK

HOW TO CONNECT THE OPTIONAL PARTS

 

(RAC Adapter, Weekly Timer, Wired Remote Control)

[For all optional part, please refer catalog for part number]

As for connecting to H-Link, a separately purchased RAC 
Adapter is required.

To install the wiring the electrical box cover must be 
opened.
Connect the connector of RAC adapter to CN7.
Assemble back the cover of electrical box.
Please refer to the respective user manual of RAC 
Adapter for further details.
Please be careful not to damage lead wires by edge of 
plate when connecting the optional parts. 

[For all optional part, please refer catalog for part number]

Connection to the electrical box:

Remove the cover of electrical box.
Connect the connector of Weekly Timer/wired remote 
controller to CN9.
Assemble back the cover of electrical box.
Please refer to the respective user manual of Weekly 
Timer/wired remote controller for further details.
Please be careful not to damage lead wires by edge of 
plate when connecting the optional parts.

Connecting

earth

screw

teminal 

cover

Securely screw in the power cord 
and connecting cord so that it will 
not get loose or disconnect.
Tightening torque reference value: 
1.2 to 1.6 N m (12 to 16 kgf cm)
Excessive tightening may damage 
the interior of the cord requiring 
replacement.

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Detail of cutting the connecting cord

Green + Yellow

Green + Yellow

Green + Yellow

Indoor Unit

Outdoor Unit

30mm

10mm

10mm

70mm

10mm

50mm

10mm

50mm

Strip wires

L N C D

(A) (B)

ø1.6 or

ø2.0

Indoor Unit 

Outdoor Unit

Connecting Cord

AC 220-230V
1ø 50Hz

RAC Adapter
cord

Fix the
wired remote
controller
cord and
RAC adapter
cord by band.

Wired remote
controller cord

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.

Screw (2 pieces)

Remote 

Controller 

Holder

Remote

Controller

<1458L :       >

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