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1: Function setting

First 2 digits Last 2 digits

Automatic address setting for

signal ampliﬁ ers

End

7.6. Indoor unit address setting

7.6.1 Indoor unit address setting

Address must be set for the indoor unit.

Manual setting

→

• When setting with the switch inside the indoor unit, refer to

the indoor unit operating manual.

• When setting with a remote control, refer to the remote

control operating manual.

Automatic setting

→

• Check that the wiring is as shown in the ﬁ gure below.

Operate using the outdoor master unit of each refrigerant

system.

Fig. Wiring example for automatic address setting

(1) Signal ampliﬁ er wiring example

(2)(3)(4) Indoor unit wiring example

(Connect the indoor and outdoor units of the same refrigerant system as shown

below.)

Refrigerant system1

Master unit

Refrigerant system2

Master unit

Signal ampliﬁ er

Refrigerant system3

Master unit

NOTE:

• The automatic address function can be used for a maximum of 9 indoor units installed to

the same refrigerant system. When network is connected to other refrigerant systems,

the automatic address function cannot be used.

• The addresses of indoor units that have been conﬁ gured automatically cannot be as-

signed in the order when they are installed. (Refer to the indoor unit installation manual

for the procedures to check the addresses.)

(the display when the main power is

turned on)

(When [F4] to [F9] are displayed, continue

to press the "SELECT" button until [F3] is

displayed.)

Press the "SELECT" button until "10" is

displayed.

Press the "ENTER" button for more than 3

seconds.

Setting is complete when the number of units

is displayed

Signal ampliﬁ er

7.6.2 Procedures to enable automatic address setting on indoor

units

Check that the rotary switch IU AD on the indoor unit PC board is set to "00".If it is not set

to "00", it means the address of that device is not set. (Factory default is "00").

Turn on the power of the indoor and outdoor units.

• When the system is normal, nothing will be displayed on the 7 segment display.

• When ERROR is displayed, inspect the units.

Use the "MODE/EXIT", "SELECT", and "ENTER" buttons on the outdoor unit PC board to

conﬁ gure settings according to the procedures below.

1: Function setting

First 2 digits Last 2 digits

(The display when the main

power is turned on)

(When [F4] to [F9] are displayed, continue to press

the "SELECT" button until [F3] is displayed.)

Automatic address setting for indoor units

Press the SELECT button until

"11" is displayed.

Press the "ENTER" button for

more than 3 seconds.

The number of indoor units with normal settings

will be displayed at the ﬁ rst 2 digits of the 7 seg-

ment LED display. The number of indoor units with

error will be displayed at the last 2 digits.

NOTE:

After the "ENTER" button is pressed, the end

processing will occur for about 30 seconds. During

this period, the 7 segment will blink.

End

7.7. Resistance measurement of transmission cable

(Measure with breaker OFF)

CAUTION

Do not turn on the power if the resistance

between the terminals of the transmission

cable is abnormal. Otherwise, the PC

board may be damaged.

Measure the resistance between 2 terminals

of a transmission cable.

(1) Transmission cable connecting in-

door units, outdoor units, and signal

ampliﬁ ers

Measure the resistance of the signal

ampliﬁ er terminal and the terminal of

the indoor and outdoor units connected

farthest away from the device where

terminal resistor is measured.

A value from the table is displayed,

depending on the distance from the

signal ampliﬁ er and the device where

the terminal resistor is set.

This value is an estimate.

(2) Transmission cable connecting

outdoor units in a refrigerant system

The resistance between the terminals

of the transmission cable is 45-60 Ω.

This value is an estimate.

Distance from termination resis-

tor (m)

~ 200 ~ 300 ~400 ~500

~100

A short circuit somewhere or 2

0 ~

or more termination resistors are

connected

100

110

120

130

140

150

160

170

180

190

Faulty contact or wiring

length over 500 m

Faulty contact, open circuit, or no

~∞

termination resistor

En-14