51 PB
OPERATION
Special Function Instruction
Conditions of anti-freezing prohibition of frequency rising:
Condition 1: in the case of anti-freezing frequency decreasing, the temperature of indoor heat exchanger rises to “anti-freezing frequency
decreasing temperature”.
Condition 2: in normal operation, the temperature of indoor heat exchanger reaches “anti-freezing prohibition of frequency rising
temperature”.
If either of the above two conditions is met, the product will enter anti-freezing prohibition of frequency rising state.
Anti-freezing prohibition of frequency rising operation:
The compressor is kept at the current frequency, which may decrease according to situations while cannot rise. The outdoor fan runs.
Condition for the end of anti-freezing prohibition of frequency rising state: when the temperature of indoor heat exchanger rises to “anti-
freezing releasing temperature”, the state of anti-freezing prohibition of frequency rising is released.
Conditions for defrosting:
A: When the heating compressor consecutively runs for 40 minutes (EEPROM setting value at the current operating mode);
B: If the ambient temperature minus the temperature of coiled pipe is equal to or higher than six degrees centigrade (EEPROM setting
value in the current operating mode);
C: If the temperature of coiled pipe is equal to or lower than minus two degrees centigrade (EEPROM setting value in the current operating
mode);
If the above three conditions are met simultaneously, defrosting begins.
Defrosting actions:
The compressor stops, and the outdoor fan stops after delay of 30 seconds; in 50 seconds the reversing valve is power off; and in 10
seconds the compressor starts and runs at “defrosting frequency”.
Conditions for ending defrosting:
Defrosting is over if either of the below conditions is met.
A. The accumulated time of defrosting is longer than 12 minutes (EEPROM setting value in the current operating mode);
B. If the temperature of coiled pipe is equal to or higher than 14 degrees centigrade (EEPROM setting value in the current operating
mode);
Actions of exiting the defrosting state:
The compressor stops, and 50 seconds later the reversing valve opens, and another 10 seconds later the compressor and outdoor
fan restart and begin normal operation.
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