Operations; Cooling Mode Sequence Of Operation - GE ASH220NCDWA Service Manual

Cooling Mode Sequence of Operation

On a call for cooling, the indoor unit will send the room temperature and set-point requirement to the outdoor unit PCB via the
data signal wire path. The data travels from the indoor unit to the outdoor unit via the wire located on terminal 3/C. The indoor
louvers will open and the indoor fan motor will start.
The outdoor unit will energize the EEVs that are controlling refrigerant flow to the calling indoor units. The position of the EEVs
will be set to an initial position based upon the outdoor air temperature.
The 4-way valve is de-energized. After a 3-minute time delay, the outdoor fan motor will be energized. Shortly after the outdoor
fan motor turns on, the compressor will start in low frequency. The operating frequency of the compressor will be displayed on
the Service Monitor Board .
The refrigerant in the system will begin to flow, and the compressor will discharge hot gas into the oil separator. Oil will be
trapped in the separator and returned to the suction inlet of the compressor via the capillary tube assembly low pressure path.
4-way valve coil:
Refrigerant flow in cooling
OFF
ON
Refrigerant flow in heating
Indoor
heat
exchanger
temp.
sensor
FAN-IN
Indoor
ambient
temperature
sensor
Indoor unit A
Indoor unit B
Indoor unit C
B-6

Operations

6
Unit A gas pipe temp. sensor Tc1
Indoor unit A
Unit B gas pipe temp. sensor Tc1
Indoor unit B
Unit C gas pipe temp. sensor Tc1
Indoor unit C
5
Unit A liquid pipe temp. sensor Tc2 Strainer
Unit B liquid pipe temp. sensorTc2 Strainer
Unit C liquid pipe temp. sensor Tc2 Strainer
OUTDOOR TECHNICAL OVERVIEW
Comp-
ressor
Discharge temp.
1
sensor
Oil
separator
High pressure
switch
Gas service valve
5/8
EEV A
EEV B
Liquid service valve
EEV C
3/8
Receiver
7
Low pressure
Suction temp.
switch
sensor Ts
Accumulator
Capillary tube
Ø2.7*Ø1.0*1400
Pipe sensor
4-way valve
Toci
Outdoor
heat
3
exchanger
temp.
sensor
Distributor
EEV O
Strainer
2
FAN-OUT
4
Outdoor
ambient
temperature
sensor Ta
Defrost
sensor Td
Te