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9-4. Check the Combination (wiring) of Indoor and Outdoor Units
Connection cable between outdoor and indoor unit has 2 types; One is 2-line connection
and the other is 3-line connection. Check the type of the outdoor unit terminal board as
illustrated below and make connection.
●
If U1 and U2 are shown on the terminal
board, it is for 2-line connection.
* See the example in Section 4-3.
U1 U2
●
If 1, 2 and 3 are shown on the terminal
board, it is for 3-line connection.
* See the example in Section 4-3.
L N 1 2 3
Connection cable
between outdoor
and indoor unit
Connection cable
between outdoor
and indoor unit
Power supply
cable
Inter-unit (between outdoor
and indoor units) control wiring
The examples above show the outdoor unit terminal boards. Carefully refer to the outdoor unit
installation instructions.
9-5. Address Setting : 2-LINE CONNECTION
NOTE
The displays of the earth, outdoor unit power supply wiring and earth leakage circuit breaker are
omitted.
9-5-1. Basic connection 1 : Single type and simultaneous multiple operations
●
Simultaneous multiple operations: It is possible to operate maximum 4 (double-
twin) indoor units within one outdoor unit. (Only specified indoor unit combination.
Independent operation is not possible by connecting an individual remote controller.)
●
It is not necessary to make setting of the refrigerant system address.
●
When turning on all indoor and outdoor units, the auto address will start.
It takes maximum 10 minutes. LED1 and LED2 of outdoor unit control PCB blink
alternately during auto address setting.
When finished, LEDs go off.
●
When the auto address setting is completed, wait at least 1 minute and 30 seconds.
Then start the operation.
1 - 1 1 - 2 1 - 3 1 - 4
0
0
Single type
System address rotary switch
(Factory shipment: “0”)
Outdoor unit
Indoor unit
Inter-unit
control wiring
Remote control
wiring
Remote controller
Inter-unit control wiring
Simultaneous multiple (double-twin) operations
Outdoor unit
System address rotary switch
(Factory shipment: “0”)
Indoor unit
Remote control
wiring
Remote control wiring
for group control
Remote controller
01_330918_EU_Eng.indb 53 2021/9/9 11:26:58
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