Heating 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 to the indoor coil making the line a hot gas line.
C. e hot gas will enter the indoor coil and condense to a saturated mix as it travel through the coil and will be
slightly subcooled.
D. e refrigerant returns to the outdoor unit through the lter, then trough the EEV reducing the refrigerant
to a low pressure liquid and will maintain 10 degrees F of superheat.
E. e cold refrigerant will travel through the outdoor coil (evaporator) and will pickup heat from the outdoor
air. is will cause the cold saturated refrigerant to ash to a saturated mixture which will be superheated to
10 degrees F.
F. e superheated vapor will travel through the 4-way valve to the accumulator which will prevent liquid
oodback.
G. e superheated gas will enter the compressor for 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.
10
Product Introduction

Heating Mode

Temperature
Sensor
e temperature of the gas in monitored by the Discharge Tem-
ere are no pressure charts to evaluate temperature or pressures.
Outdoor Unit
Heat
Filter
Exchanger
Electronic
expansion
valve
Accumulator not
on all sizes
4-way
valve