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8.3 Outdoor unit PCBs
8.3.1 MAIN PCB
1) Label descriptions are given in Table 8-2
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
Table 8-2
NO.
1
CN32：Main board power supply.
2
CN99:slave board power supply.
3
CN68:Pump(220-240V control power supply )
1）After receiving start-up instruction, the pump will be started up instantly, and will maintain start-up state always
in the process of operation.
2）In case of refrigerating or heating shutdown, the pump will be shut down 2 minutes after all modules stop
operating.
3）In case of shutdown under the pump mode, the pump can be directly shut down.
4
CN74/CN67:CCH,Crankcase heater
5
CN75/CN66:EVA-HEAT,Electric of water side heat exchanger heaters connection
6
CN48:ST1,Four-way valve
7
CN47:SV6,Liquid bypass solenoid valve
8
CN49:SV5,Multi-function solenoid valve
9
CN84:SV8A,Injection solenoid valve of compressor system A
10
CN83:SV8B,Injection solenoid valve of compressor system B
CN93：The alarm signal output of the unit(ON/OFF signal)
11
Attention: the control port value of the alarm actually detected is ON/OFF but not 220-240V control power supply，so
special attention should be paid when installing the alarm signal output.
33 34
35
36
37
38 39
13 12
Fig. 8-9 Main board of SCV-750EB and SCV-1400EB
Detail information
15
1
2
3
4
5
6
7
8
9
10
11
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