8-7. Defrosting Operation (Heating)
■Defrosting Flowchart
Compressor ON
Release of overload prevention (Outdoor fan operates.)
YESOverload prevention works. Does outdoor fan
stop?
NO
A
B
C
D
NO
Outdoor fan is either operated or stopped for more than 10 minutes.
Is outdoor fan continuously operating for more than 10 minutes?
YES
Integrated operating time of compressor is more than 50 minutes.
Temperature of indoor heat exchanger coil is below 113 + 23¡F.
Compressor keeps running for at least 6 minutes.
Indoor heat exchanger coil temperature drops 1.4¡F per 6 minutes and it repeats
3 times in succession.
Temperature of indoor heat exchanger coil is below 113¡F.
Continuous operating time of compressor is more than 20 minutes.
Integrated operating time of compressor is more than 3 hours.
Temperature of indoor heat exchanger coil is below 113¡F.
Compressor keeps running for at least 6 minutes.
Integrated operating time of compressor is more than 1.5 hours.
Thermo. OFF.
(Compressor OFF)
Temp. of indoor heat exch. coil immediately before thermo goes off is either below 113 + 7¡F or 136 + 7¡F (when overload prevention works).
NO
YES
Compressor keeps running for at least 6 minutes.
Temperature of outdoor heat exchanger coil is below 48¡F.
Defrosting begins.
Temperature of outdoor heat exchange coil is higher than 54¡F.
Defrosting time is over 12 minutes.
Release of defrosting
Indoor fan runs at set speed when temperature of indoor heat exchanger reads 95¡F.
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