Fisher FSAIF-Pro-123AE2, Service Manual

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Meanwhile, the maximum frequency is limited by the indoor fan speed.
Indoor fan speed Maximum frequency
High speed/8 degree heating/ turbo function No limit
Medium speed FHeatMaxMidFan
Low speed/sleep mode FHeatMaxLowFan
Silent mode Fixed at F3
If users switch on AC by remote controller, the compressor will run at the Fmax frequency for 7
minutes according to outdoor ambient temp. During the 7 minutes, the frequency limitation is active.
7 minutes later, the compressor running frequency will be controlled as below:
While the zones of A,B,C... are corresponding to different compressor running frequency.
Temperature compensation: ΔT=4°C as default (it can be modified by the service).
Note:
When T1-Ts keeps in the same temp. zone for 3 minutes, the compressor will run as the below rules:
A: Increase the frequency to 3 grade higher until to FREMAX.
B~E: Increase the frequency to 2 grade higher until to FREMAX.
F~G: Increase the frequency to 1 grade higher until to FREMAX.
H: Keep the current frequency.
I: Decrease the frequency to the 1 grade lower until to F1.
J: Run at F1 for 1h. (if T1-Ts-ΔT >2
℃
, the compressor will stop)