Electronic Expansion Valve (Eev) Control; 4-Way Valve Heating Control; Compressor Sump Heater - GE ASH220NCDWA Service Manual

Electronic Expansion Valve (EEV) Control

Electronic characteristics
Max. open angle 480 pulses
Driving speed PPS
Open angle limitation of EEV
Unit stop
Cool/ dry 5 pulses 480 pulses
Heat 5 pulses 480 pulses
The EEV routinely opens and closes to maintain the compressor discharge temperature within an acceptable range.

4-Way Valve Heating Control

When the compressor starts in the heating mode, there is a 1-minute delay before power is applied to the 4-way valve to switch
the flow of hot refrigerant to the indoor coil. When the call for heat is satisfied and the compressor shuts off, a 3-minute delay will
occur before the 4-way valve is powered down and switches back to the at-rest (cooling) position.
compressor
4-way valve
If the 4-way valve does not switch into the heating mode, after 15 minutes of compressor run time and the indoor coil
temperature is below 41°F/5°C, the compressor will stop and the unit will display a 17-flash error code on the outdoor PCB.

Compressor Sump Heater

The sump (crankcase) heater keeps refrigerant at a higher temperature than the coldest part of the system. This prevents
refrigerant from mixing with the compressor oil and also dries condensed refrigerant inside the sump. The sump heater will be
energized when the ambient temperature is below 81°F/27°C and will be off when the ambient is 90°F/32°C.
O O
41 F(5 C<Ta ≤50
O O
32 F(0 C)<Ta ≤41
Max. open angle Thermostat OFF
5 pulses
50 pulses
ON
OFF
ON
OFF
50S
O O O
Ta>50 F(10 C) OR Td>=68
O O O
F(10 C)and Td<68
O O O
F(5 C)and Td<68
O O O
32 F(0 C)>=Ta andTd<68
OUTDOOR TECHNICAL OVERVIEW
Operations
Min. open angle
80 pulses
80 pulses
Heater OFF
O
F(20 C) 0
O
F(20 C) 50%*60min
O
F(20 C) 33%*60min
O
F(20 C) 0
2 minutes and 55s
Heater ON*min
0
50%*60min
66%*60min
100%*60min
B-11