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10-8-2. Basic wiring diagram 2
Group control (when a central control device is not used)
●
Simultaneous-operation multi system
Up to 4 (Double-Twin) indoor units can be connected to 1 outdoor unit for operation.
(However, coordinate the outdoor unit capacity and the total capacity of the indoor units.)
(It is not possible to connect individual remote controllers for independent operation.)
A maximum of 8 indoor units can be connected to 1 remote controller.
When 2 or 3 indoor units are connected to each outdoor unit in the refrigerant system, set the system address
(refrigerant tubing system address) before turning on the remote power switch. (Refer to 10-8-3. Setting the out-
door unit system addresses.)
(Set using the system address rotary switch on the outdoor unit control PCB.)
Fig. 10-6
1 2
1 2
1
2
U2
U1
1
2
U2
U1
1
2
U2
U1
1 2
1
2
L
N
L
N
L
N
T
N
L
N
L
1
2
U2
U1
L
N
L
N
1
2
U2
U1
Outdoor unit
Indoor
unit
Indoor
unit
Indoor
unit
Indoor
unit
Indoor
unit
Outdoor unit
Ground
Ground
Ground
Ground
Ground
Ground
Ground
(Optional)
Wired remote
controller
Remote controller wiring
Remote controller crossover
wiring for group control
System address rotary switch
(Change the setting.)
System address rotary switch
(Change the setting.)
Indoor power crossover
wiring – up to 16 units
(no-heater units only)
Inter-unit control wiring
WHT
BLK
Leakage breaker
Leakage breaker
Leakage breaker
Leakage breaker
(Wiring procedure)
(1) Connect the remote controller to the indoor unit remote controller wiring terminal plate (1, 2). (Remote controller
wiring)
(2) Connect the indoor units (U1, U2) and the outdoor units (1, 2). Connect the other outdoor units and indoor units
(with different refrigerant systems) in the same way. (Inter-unit control wiring)
Connect the remote controller crossover wiring to the indoor units (U1, U2) for each refrigerant system. (Inter-
unit control wiring)
(3) Connect the remote controller crossover wiring (2 wires) from the remote controller wiring terminal plate (1, 2)
on the indoor unit (unit where the remote controller is connected) to the remote controller terminal plates (1, 2)
on the other indoor units. (Remote controller crossover wiring)
(4) Turn ON both the indoor and outdoor unit power and perform automatic address setting from the remote con-
troller. (For the automatic address setting procedure, refer to 10-8-4.)
* Models with auxiliary heaters cannot be used for crossover wiring of the indoor unit power wires. (Use a pull box
to divide the wiring.)
Be sure to use the indoor unit temperature sensor (body sensor) when using this control. (Status at shipment.)
NOTE
04-393 DC INV Tech p 64-110 12/13/04 11:35 AM Page 69