Friedrich Floating Air Pro-Premiere FPHW091 Service & Parts Manual page 23

Fan Only Mode Operation
During the appliance run in this mode; the compressor and outdoor fan stop and the indoor fan operates under the pre‑setting of air
volume. The louver swing and the indoor fan speed is the same 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, and the outdoor fan stops after delay of 30 seconds; in 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 is over if either of the conditions below are met.
• Condition 1: The accumulated time of defrosting is longer than 12 minutes (EEPROM setting value in the current operating
mode).
• Condition 2: If the temperature of coiled pipe is equal to or higher than 57°F (EEPROM setting value in the current operating
mode).
Actions of exiting the defrosting state:
• The compressor stops. 50 seconds later the four‑way valve opens, and another 10 seconds later the compressor and outdoor
fan restart and begin normal operation.
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.
23
OPERATION