V4+R VRF 50/60Hz
201608 45
Part 5 - Diagnosis and Troubleshooting
Table 5-2.1: Main PCB ports
Compressor top temperature sensor (single compressor units) or
compressor A compressor top temperature sensor (dual
compressor units) connection
Discharge pipe temperature sensor (single compressor units) or
compressor B compressor top temperature sensor (dual
compressor units) connection
Inverter module temperature sensor connection
No.1 transformer power input
No.2 transformer power input
Power supply to compressor A crankcase heater
Power supply to compressor B crankcase heater
First pin on the left: 12V DC; other four pins:
varying
Four-way valve drive ports
Solenoid valve drive ports
No.1 transformer power output
Voltage between upper two pins: 13.5V AC;
voltage between lower two pins: 9V AC
No.2 transformer power output
Voltage between upper two pins: 14.5V AC;
voltage between lower two pins: 14.5V AC
Inverter module B control port
Third pin on the left: 3.3V DC
Inverter module B voltage monitor port
Inverter module A voltage monitor port
Inverter module A control port
Third pin on the left: 3.3V DC
5V DC, 12V DC power input
Low pressure switch connection
High pressure switch and discharge temperature switch(es)
connections
Inverter compressor A and B current sensor connections
High pressure sensor connection
Right condenser temperature detection port
Outdoor ambient temperature sensor and outdoor heat exchanger
temperature sensor connections
Outdoor units communication port
First pin on the left: 12V DC; other four pins:
varying
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