R410A All DC Inverter Mini VRF MCAC-VTSM-2014-09
66 Troubleshooting
1.
PCB ports instructions
10.5 kW
PCB ports instruction
No.
Content
Port voltage
1 CN27
PCB power supply output port
208-230V
2 CN33
EXV download output port
The first pin on the left: DC12V
The other four pins: in dynamic change
3 CN32
Online Programmable Port
/
4 CN19
Reserved
/
5 CN21
Load output port
208-230V
6 CN14
Load output port (SV6)
0V or
208-230V
7 CN22
Load output port
220V
8 CN15
Load output port (4-way valve)
0V or
208-230V
9 CN23
Load output port
208-230V
10 CN16
Load output port
0V or
208-230V
11 CN34
Signal output of outdoor fan port
15V
12
EEPROM Port
/
13 CN18
Power supply of outdoor fan port
15V
14 CN30
Communication port between indoor units
DC2.5~5V
15 CN29
Communication port between outdoor unit and indoor unit
DC2.5~5V
16 CN13
Signal input port of system low pressure & high pressure detect
switch
DC0~5V (in dynamic change)
17 CN8
Discharge temperature detection port of the inverter compressor
DC0~5V (in dynamic change)
18 CN9
Outdoor temperature & condenser coil temperature detection port
DC0~5V (in dynamic change)
19 CN49
Communication port between PCB and PFC module
The first pin on the left: DC12V
The other four pins: in dynamic change
20 CN31
Reserved
/
21 CN24
Reserved
/
22 CN11
Power input port
208-230V
23 CN10
Power input port
208-230V
24 CN17
Communication port between PCB and IPM module
The first pin on the right: DC12V;the second
pin on the right:5V
4
5 6 7 8 9 10
11
13
14
15
16
17
18
19
20
21
2
3
12
22
23
1
24
