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Defrost Control
The defrost control ensures that the heat pump outdoor
coil does not ice excessively during the heating mode.
Defrost is enabled below 35°F. The Unit Controller will
cycle in and out of defrost depending on the temperature
difference between the outdoor coil and outdoor air
temperature. If the system fails to calibrate or obtain
readings for demand defrost, defrost will run-time at the
field setting.
Defrost is also initiated when the accumulated run time
with the outdoor coil temperature below 35°F reaches six
hours. Low gas heat (LDT) or electric heat (optional on
LHT) is energized during defrost.
Note - Only one refrigerant circuit will go into defrost at a
time.
Defrost Test or Forced Defrost Option−
A TEST option is provided for troubleshooting. The TEST
mode may be started at any time using the mobile service
app. Defrost mode may be started by entering the Defrost
Mode in the Component Test Menu. When defrost is
started, unit will run in Defrost Mode for a maximum of five
minutes or when the outdoor coil reaches 100°F,
whichever occurs first.
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