Midea V4+R Series, Service Manual

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V4+R VRF 50/60Hz
201608 45
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Table 5-2.1: Main PCB ports
Label in
Figure 5-2.1
Port
code
Content Port voltage
1 CN10
Compressor top temperature sensor (single compressor units) or
compressor A compressor top temperature sensor (dual
compressor units) connection
0-5V DC (varying)
2 CN11
Discharge pipe temperature sensor (single compressor units) or
compressor B compressor top temperature sensor (dual
compressor units) connection
0-5V DC (varying)
3 CN4 Inverter module temperature sensor connection 0-5V DC (varying)
4 CN26 Reserved
5 CN25 Communication port 2.5-2.7V DC
6 CN30 Power input 380V
7 CN80 Reserved
8 CN31 No.1 transformer power input 220V
9 CN33 No.2 transformer power input 220V
10 CN66 Power supply to compressor A crankcase heater 220V
11 CN67 Power supply to compressor B crankcase heater 220V
12 CN70 EVXA drive port
First pin on the left: 12V DC; other four pins:
varying
13 CN71 EVXB drive port
14
CN47-
CN49
Four-way valve drive ports 220V
15
CN41-
CN45
Solenoid valve drive ports 220V
16 CN54 Power output 220V
17
CN57-
CN59
Neutral terminals 0
18 CN32 No.1 transformer power output
Voltage between upper two pins: 13.5V AC;
voltage between lower two pins: 9V AC
19 CN34 No.2 transformer power output
Voltage between upper two pins: 14.5V AC;
voltage between lower two pins: 14.5V AC
20 CN39 Inverter module B control port Third pin on the left: 3.3V DC
21 CN38 Inverter module B voltage monitor port 540V DC, +15V DC, N
22 CN36 Inverter module A voltage monitor port 540V DC, +15V DC, N
23 CN37 Inverter module A control port Third pin on the left: 3.3V DC
24 CN35 5V DC, 12V DC power input GND, +5V, +12V, GND, 12V
25 CN19 Low pressure switch connection 0 or 5V
26 CN18
High pressure switch and discharge temperature switch(es)
connections
0 or 5V
27 CN28 Reserved
28 CN16 Reserved
29 CN15 Inverter compressor A and B current sensor connections 0-7.8V AC (varying)
30 CN17 High pressure sensor connection 0-5V DC (varying)
31 CN2 Right condenser temperature detection port 0-5V DC (varying)
32 CN1
Outdoor ambient temperature sensor and outdoor heat exchanger
temperature sensor connections
0-5V DC (varying)
33 CN20 Outdoor units communication port 2.5-2.7V DC
34 CN65 Fan B control port First pin on the left: 12V DC; other four pins:
varying 35 CN64 Fan A control port