Superheat Method

Superheat Method
The following information has been developed to determine the
proper charge for Goodman Heat Pump Systems that are
already in operation.
NOTE: Many field variations exist which may affect the
operating temperature and pressure readings of a heat pump
system. All Goodman Heat Pump Systems utilize fixed orifice
refrigerant control devices. The following procedure has been
developed for this type of refrigerant control device.
1. With both base valves fully open, connect a set of service
gages to the base valves' service port, being careful to
purge the lines.
2. Allow the system to operate at least 10 minutes or until
the pressures stabilize.
3. Temporarily install a thermometer on the suction (large)
line near the condensing unit's base valve. Make sure
that there is good contact between the thermometer and
the refrigerant line and wrap the thermometer and line
with insulating tape to assure accurate readings.