Gree Versati GRS-CQ4.0Pd/NhH-E Owner's Manual page 44

Air-to-water Heat Pump Split Versati
X30 Reserved
X31 Reserved
X32 Reserved
X33 Reserved
X34 3-way valve signal
CN30 Build-in water pump signal(PWM)
CN31 Back-up water pump signal(PWM)-field supply
CN18 20K temperature sensor (inlet water)
CN19 20K temperature sensor (outlet water)
CN15 20K temperature sensor (refrigerant liquid line)
CN15 20K temperature sensor (outlet water)
CN15 20K temperature sensor (refrigerant liquid line)
CN16 20K temperature sensor (refrigerant vapor line)
CN16 10K temperature sensor (leaving water for the optional electric heater)
CN16 Rreserved
CN8 Water tank temperature sensor
CN9 Remote room temperature sensor
CN7 Rreserved
CN6 Rreserved
CN5 Rreserved
CN20 Thermostat
CN21 Detection to welding protection for the optional electric heater 1
CN22 Detection to welding protection for the optional electric heater 2
CN23 Detection to welding protection for the water tank electric heater
CN24 Gate-control detection
CN25 Flow switch
CN26 Reserved
CN3 Communication with outdoor unit
CN4 Communication with control panel
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SPLIT TYPE