9
Indoor Unit
Outdoor Unit
Heat Exchanger
Heat
Exchanger
Inverter
Compressor
Accumulator not
on all sizes
4-way
valve
Electronic
expansion
valve
Filter
Cooling Mode
A. Hot gas is discharged from the compressor. e temperature of the gas in monitored by the Discharge Tem-
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. e hot gas will be slightly sub-
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. e EEV will adjust its ow based upon the temperature sensor readings. e adjust-
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. is cold saturated re-
frigerant will move through the coil absorbing heat. is liquid will ash to a vapor and will be superheated
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. ere are no pressure charts to evaluate temperature or pressures.
Temperature
Sensor
Product Introduction
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