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ELECTRIC WIRING WORK

8-1

GENERAL INSTRUCTIONS

• Make certain that all electric wiring work is carried out by

qualified personnel according to the applicable legislation
and this installation manual, using a separate circuit. Insuffi-
cient capacity of the power supply circuit or improper electri-
cal construction may lead to electric shocks or a fire.

• Make sure to install an earth leakage breaker in accordance

with applicable legislation. Failure to do so may cause elec-
trical shock and a fire.

• Do not turn on the power supply (of the indoor unit) until all

the installation work is completed.

• Make sure to earth the air conditioner.

Earthing resistance should be according to applicable legis-
lation.

• Do not connect the earth wiring to gas or water piping, light-

ning conductor or telephone earth wiring.
• Gas piping ............Ignition or explosion may occur if the

gas leaks.

• Water piping .........Hard vinyl tubes are not effective

earths.

• Lightning conductor or telephone earth wiring

Electric potential may rise abnormally if struck by a light-
ning bolt.

• For electric wiring work, refer to also the “WIRING DIA-

GRAM” attached to the control box cover.

• Never connect the power supply wiring to the terminal block

for remote controller wiring, or otherwise the entire system
may be damaged.

• Carry out installation and wiring of the remote controller

according to the “installation manual” attached to the remote
controller.

• Do not touch the Printed Circuit Board assy during the wiring

work. Otherwise, it may cause damage.

• If the supply cord is damaged, it must be replaced by the

manufacturer, its service agent or similarly qualified persons
in order to avoid a hazard.

8-2

SPECIFICATIONS FOR FIELD WIRING

For the wiring of outdoor units, refer to the installation manual
attached to the outdoor units.

• Remote controller and transmission wiring are field supply.

(Refer to Table 2)

Table 2

* This will be the total extended length in the system when

doing group control.

Wiring specifications are shown on the condition that the wiring
has a voltage drop of 2%.

NOTE

NOTE

1. It shows the case when conduit piping are used. When the

conduit piping are not used, use H07RN-F (60245 IEC 66).

2. Sheathed vinyl cord or cable (insulation thickness: 1mm or

more)

HOW TO CONNECT WIRINGS AND WIRING EXAMPLE

Wiring connection method

Caution for wiring

• The indoor units in the same system can be connected to the

power supply from one branch switch. However, selection of
branch switch, branch overcurrent circuit breaker and wiring
size must be according to applicable legislation.

• For connection to the terminal block, use ring type crimp style

terminals with insulation sleeve or treat the wiring with insu-
lation. (Refer to Fig. 30)

• If the above is not available, make sure to observe the follow-

ing items.

• 2 wirings of different sizes to the terminal block for power

supply is prohibited.

(Abnormal heating may occur if the wirings are not tightened
securely.)

• Use the required wirings, connect them securely and fix

these wirings so that external force may not apply to the ter-
minals.

• Use a proper screw driver for tightening the terminal screws.

If an improper screw driver is used, it may damage the screw
head and a proper tightening cannot be carried out.

• If a terminal is over tightened, it may be damaged. Refer to