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A. Hot gas is discharged from the compressor. e temperature of the gas in monitored by the Discharge
Temperature 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
subcooled, 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) to the appropriate indoor unit and will
regulate to about a 10 degree F superheat level. e EEV will adjust its ow based upon the temperature
sensor readings. e adjustment 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
refrigerant 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 will be 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.
Product Introduction
Cooling Mode
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