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2
2. SYSTEM PROTECTION DEVICES
2-1 FOR HEAT PUMP SYSTEM
PROTECTION TYPE PROTECTION EFFECT
OPERATION MODE
WHEN ON
Cold draft prevention
Indoor fan off
Heating mode
During unit operation
Defrost cycle
Indoor fan off
Heating mode
During unit operation
Indoor coil
Freeze protection
Compressor off
Cooling mode
During unit operation
Against frequent
Compressor cycling
Compressor
Time delay
Cooling or heating
modes
At unit start-up or
change of operating
mode
2-2 FOR COOL ONLY SYSTEM
PROTECTION TYPE PROTECTION EFFECT
OPERATION MODE
WHEN ON
Indoor coil
Freeze protection
Compressor off
Cooling mode
During unit operation
Against frequent
Compressor cycling
Compressor
Time delay
Cooling mode
At unit start-up or
change of operating
mode
WARNING:
During heat pump operation the system will undergo several defrost cycles to remove
ice that might collect on the outdoor unit in very low ambient temperature. In these
cycles, the indoor fan will be automatically off and cannot operate until defrost cycle
is completed.
