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10-2. Defrosting Operation (Heating)
■ Defrosting Flowchart
■ Defrosting Mode Timing Chart
Once the air conditioner enters defrosting mode, it will not release defrosting until the
outdoor heat exchanger coil temperature rises above 39°F. During this period, heat is
provided by electric heater instead of by the heat pump.
NOTE
Outdoor heat
exch coil
temp.
Release of defrostingStart of defrosting
39 °F
14 °F
ON
Solenoid coil
(4-way valve)
Compressor
OFF
ON
ON
ON
Electric heater ON
ON
Fan motor
OFF OFF
Set speed
YES
YES
Temperature of outdoor heat
exchanger coil is blow 14°F.
Temperature of outdoor heat
exchanger coil is higher than
39°F.
Defrosting begins
Compressor ON
Release of defrosting
NO
NO
● Compressor ➞
OFF
● Electric Heater ➞
ON
Heat Pump Model
Model STB0823H1