124 PB
OPERATION
Fan Only Mode Operation
In this mode, the compressor and outdoor fan stop, indoor fan operates under the pre‑setting of air volume, the louver swing, and
the indoor fan speed is defaulted to the current setting in as the Heating Mode.
Defrost
Conditions for Defrost Activation:
The following three conditions must be met to activate Defrost.
• Condition 1: Outdoor ambient sensor is below 28.4F
• Condition 2: When the heating compressor consecutively runs for 40 minutes .
• Condition 3: The difference between the condenser coil pipe sensor outdoor ambient temperature sensor ≥10F.
Defrosting actions:
• The compressor stops, the outdoor fan stops after a delay of 30 seconds; after 50 seconds the four‑way valve is powered off;
and in 10 seconds the compressor starts and runs at “defrosting frequency”.
Conditions for ending defrosting:
Defrosting ends if either of the below conditions is met.
• Condition 1: The accumulated time in defrost is longer than 12 minutes.
• Condition 2: If the temperature of outdoor coil is 57F/14C or higher. (EEPROM setting value in the current operating mode).
Post Defrost Cycle:
• The compressor stops, for 50 seconds later the reversing valve energizes, and another 10 seconds later the compressor and
outdoor fan start normal heating operation.
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