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S4359146
9-2. Electrical Wiring
B1
Indoor unit PCB
CRV
(CN91: WHT)
2P terminal base
Indoor unit
System controller
Accessary connector
Wire joint connection
2044_M_I
B2
B3
B4
B5
B6
U1
U2
How to connect electrical wiring
(1) Connect B1, B2 to indoor PCB CRV connector
using accessary 2P connector. (*No polarity)
Total wire legth is less than 985 ft. and size is
AWG#18.
(2) Connect B5, B6 to indoor unit 2P terminal base.
(*No polarity). Wire size is AWG#18.
● Basic wiring
B1:
B2:
B3: Not be used
B4: Auxiliary of inter-unit control wiring
B5:
B6:
● Terminals for remote monitoring
A1: Input for turning on air conditioners concurrently.
A2: Input for turning off air conditioners concurrently.
A3:
Common input for turning air conditioners on or off.
A4: On operation state indicator output.
A5: Alarm indicator output.
A6: Common indicator output.
Basic wiring diagram of control wiring
● Max. 64 indoor units and 30 outdoor units can be
connected in 1 system.
● Up to 10 system controller can be connected in 1
system.
Fig. 9-3
Power supply: DC12V *No polarity
To CRV connector (CN91) on indoor PCB
Inter-unit control wiring. (Low voltage)
To indoor unit 2P terminal base (U1, U2)
*No polarity
Inter-unit
control wiring
System controller
RC1
1-1
2045_M_I
RC2 RC3
1-2 1-3 2-1 2-2 2-3 3-1
Fig. 9-4
A1
<Back side of system controller>
A2
A3
A4
A5
A6
B6
B5
B4
B3
B2
B1
Connector for
weekly timer
(Under the terminal)
3005_M_I