GE ASH220NCDW - Ash324 Ncdwa Ash436 Ncdwa

OUTDOOR TECHNICAL OVERVIEW
ENGLISH
B-1
OUTDOOR TECHNICAL OVERVIEW
Components ......................................................................................................................................................................... B-2
Component Overview ......................................................................................................................................................... B-2
Service Monitor Board (SMB) .............................................................................................................................................. B-3
Inverter Power Module (IPM) ............................................................................................................................................... B-3
PCB ....................................................................................................................................................................................... B-4
Power Filter Board (PFB) ...................................................................................................................................................... B-5
Operations............................................................................................................................................................................ B-6
Cooling Mode Sequence of Operation ............................................................................................................................... B-6
Heating Mode Sequence of Operation ............................................................................................................................... B-8
Defrost Cycle Sequence of Operation ............................................................................................................................. B-10
Electronic Expansion Valve (EEV) Control ........................................................................................................................ B-11
4-Way Valve Heating Control ............................................................................................................................................ B-11
Compressor Sump Heater ................................................................................................................................................ B-11
Defrost Control .................................................................................................................................................................. B-12
Base Pan Heater Control Logic ......................................................................................................................................... B-12
Troubleshooting the Base Pan Heater Error .................................................................................................................... B-12
Discharge Sensor Protection ............................................................................................................................................ B-12
High Current Protection .................................................................................................................................................... B-13
High Pressure Protection in Cooling ................................................................................................................................. B-13
High Pressure Protection In Heating ................................................................................................................................ B-13
Low Pressure Protection ................................................................................................................................................... B-14
Oil Return Cycle ................................................................................................................................................................. B-15
Testing ................................................................................................................................................................................ B-16
Outdoor Fan Motor ............................................................................................................................................................ B-16
Temperature Sensor .......................................................................................................................................................... B-16
4-Way Valve ....................................................................................................................................................................... B-17
Electronic Expansion Valve (EEV) ..................................................................................................................................... B-17
Variable Speed Compressor ............................................................................................................................................. B-18
Wiring Error Check ............................................................................................................................................................. B-18
Wiring Diagrams ................................................................................................................................................................. B-19
DIP Switch Settings ............................................................................................................................................................ B-22
Error Codes ......................................................................................................................................................................... B-24
Table of Contents
ASH220NCDWA
ASH324NCDWA
ASH436NCDWA