Appendix: Interface Diagram for Each Mainboard
Silkscreen Interface
AC-L Power Live Wire
AC-N Power Neutral Wire
CN12 Outdoor Ambient Sensor
CN14 Condenser Temp. Sensor
CN25 Exhaust Temp. Sensor
X2（LPP） LV Protection Switch
X4(OVC1) HV Protection Switch
X8(LVCC) Overload Protection Switch on Compressor
X11 4-way Valve
X13 AC Contactor
X15 Outdoor Fan
X16 Compressor with Electric Heater
CN17 Electronic Expansion Valve
ZB1 WZ4D35
ZB1 WZ4D15
CN65、CN66、CN67 Communication Wire
Fig 1 ZB1 WZ4D35, ZB1 WZ4D15 PCB Interface Diagram
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