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Ports functions:
CN1: communication port between indoor and outdoor of system B
CN2: connection port of ambient temp. sensor
CN3: connection port of system B coil temp.sensor and discharging temp. sensor
CN4: connection port of system A coil temp.sensor and discharging temp. sensor
CN6: communication port between indoor and outdoor of system A
CN8: secondary side output of transformer
CN9: connection port of outdoor motor
CN11: connection port of system A 4-way valve
CN12: connection port of system B 4-way valve
CN14: compulsory operation port; if the side marked with “heat” is connected with the
middle wire, it is compulsory heating; if the side marked with “cool” is connected
with the middle wire, it is compulsory cooling
CN15: time-shorting port
CN16: serial port output, used to connect the device
CN17: system B low pressure switch wire
CN18: system A high pressure switch wire
CN19: system B high pressure switch wire
CN22: system A low pressure switch wire
CN23: to system B unloading valve
CN24: transformer primary side input
CN25: to indoor A1 solenoid valve
CN26: to indoor A2 solenoid valve
CN27: to indoor B1 solenoid valve
CN28: to indoor B2 solenoid valve
CN29: to system A unloading valve
CN32: system A compressor control port
CN33: system B compressor control port
CP1, CP2: PCB neutral wire and live wire port
CP3, CP4: system A electric heater control port
CP5, CP6: system B electric heater control port
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