R410A DC Inverter V4 Plus 50Hz MCAC-VTSM-2014-04
86
Troubleshooting
Main board ports instruction
No.
Content
1
Discharge temp. sensed port of the inverter compressor
19
Null line terminal
2
Discharge temp. sensed port of the No.1 fixed compressor
20
Low speed output terminal of Fan 4
3
Discharge temp. sensed port of the No.2 fixed compressor
21
High speed output terminal of Fan 4
4
Discharge temp. sensed port of the No.3 fixed compressor
22
Low speed output terminal of Fan 3
5
Discharge temp. sensed port of the No.4 fixed compressor
23
Power input terminal of Fan 3 and Fan 4
6
Reserve
24
High speed output terminal of Fan 3
7
Reserve
25
Power output of the No.1 transformer
8
Wiring port for communication between indoor and outdoor
units, indoor unit network, outdoor unit network and network
accounting
26
Power output of the No.2 transformer
9
Three-phase detection port
27
Port for inverter module voltage inspection
10
Power input of the No.1 transformer
28
The sensor of inverter module current
11
Power input of the No.2 transformer
29
Activation port of inverter module
12
Heat output terminal of inverter compressor
30
Null line control port
13
Power control output terminal
31
Power supply connected port of the main control
panel
14
Fixed compressor control output terminal
32
ON/OFF signal input port for system low
pressure inspection
15
Solenoid valve output terminal
33
ON/OFF signal input port for system high
pressure inspection
16
EXV B driving port
34
Input port for system high pressure inspection
17
EXV A driving port
35
Current inspection port of the fixed compressors
18
Port for fan 1 and fan 2 control
36
Current inspection port of the inverter
compressors
19
Null line terminal
37
Inspection port for temp. of outdoor ambient and
condenser coil
