Cooling Mode - Gree GWH12TB-D3DNA1A Installation, Service & Troubleshooting

Indoor Unit
Heat Exchanger
A. Hot gas is discharged from the compressor.
perature sensor and sent to the outdoor control panel.
B. e hot gas is directed through the 4-way valve, then enters the outdoor coil.
cooled, however there are no pressure ports to take measurements.
C. e subcooled liquid will enter the lter to remove contaminates.
D. e subcooled liquid will enter the Electronic Expansion Valve (EEV) and will be regulated to about a 10 de-
gree F superheat level.
ment process and compressor speed are controlled by the outdoor circuit board.
E. e refrigerant leaving the EEV will be in a low pressure/temperature saturated state.
frigerant will move through the coil absorbing heat.
to about 10 degrees F. Since this tubing is cold, it must be insulated.
F. e superheated vapor in returned to the outdoor unit's 4-way valve.
G. e refrigerant will ow to the accumulator (not all models will have an accumulator) where liquid and
vapor are separated.
H. e refrigerant will ow to the compressor and complete another refrigeration cycle.
e control board will monitor the temperature and pressures and adjust the frequency of the compressor and
ow rate of the EEV as needed.
Product Introduction

Cooling Mode

Temperature
Sensor
e temperature of the gas in monitored by the Discharge Tem-
e EEV will adjust its ow based upon the temperature sensor readings.
ere are no pressure charts to evaluate temperature or pressures.
Outdoor Unit
Heat
Filter
Exchanger
Electronic
expansion
valve
Accumulator not
on all sizes
is liquid will ash to a vapor and will be superheated
4-way
valve
e hot gas will be slightly sub-
e adjust-
is cold saturated re-
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