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R410A DC Inverter Series
Carrier service manual
158
Troubleshooting
2. Main control board instructions
2.1 PCB ports instruction
No.
Content
Port voltage
1 CN10
Discharge temperature sensor port of the inverter compressor A
DC0~5V (in dynamic change)
2 CN11
Discharge temperature sensor port of the inverter compressor A or B
DC0~5V (in dynamic change)
3 CN8
The temperature of heat sink
DC0~5V (in dynamic change)
5 CN22
Reserve
6 CN16
Wiring port for communication between indoor and outdoor units, indoor
unit network, outdoor unit network and network accounting
DC2.5~2.7V
7 CN1
Power port
208-230V
8 CN30
Power input of the NO.1 transformer
208-230V
9 CN29
Power input of the NO.2 transformer
208-230V
10 CN38
Loading output terminal
208-230V
11 CN36
EXV A driving port
The first pin on the left: DC 12V
12 CN41
Loading output terminal
208-230V
13 CN35
EXV B driving port
The first pin on the left: DC 12V
14 CN49
Loading output terminal
208-230V
15 CN57
L2 phase power
16 CN12
Power output of the NO.1 transformer
Yellow-Yellow: AC 9V; Brown-Brown:
AC 13.5V
17 CN15
Power output of the NO.2 transformer
Yellow-Yellow: AC 14.5V; Blue-Blue:
16V
18 CN14
Activation port of inverter module B
The left the third pin: DC3.3V
19 CN17
Port for inverter module B voltage inspection
15V,N
20 CN18
Port for inverter module A voltage inspection
15V,N
21 CN13
Activation port of inverter module A
The left the third pin: DC3.3V
22 CN19
Power supply connected port of the main control panel
GND 5V 12V GND 12V
23 CN25
ON/OFF signal input port for system low pressure inspection
0 or 5V
24 CN26
ON/OFF signal input port for system high pressure inspection
0 or 5V
25 CN7
Reserve
26 CN6
Reserve
27 CN43
Current inspection port of the inverter compressor A and B
28 CN32
Input port for system high pressure inspection
DC0~5V (in dynamic change)
29 CN28
Reserve
30 CN27
Inspection port for temperature of outdoor ambient and condensator coil
DC0~5V (in dynamic change)
31 CN24
Communication ports between outdoor units
DC2.3~2.8V
32 CN20
Control port of DC fan A
The first pin on the left: DC 5V
33 CN21
Control port of DC fan B
The first pin on the left: DC 5V
ENC1 ENC3 S12 S3
S7
S8
S1
ENC2
ENC4
S4
S2
S6
S5
Outdoor
address
dial switch
Outdoor power
dial switch
Outdoor network
address dial swit ch
Query
button
Forced
cooling
33
3
5
6
7
2
1
8
9
10
11
12 13
14
15
17
16
30 29 28
27
26
25 24 23 22
21
20
19
18
32
31