Fisher FSAIF-Pro-93AE2 Service Manual page 43

8.4.3.4 Defrosting mode
Condition of defrosting:
If any one of the following items is satisfied, AC will enter the defrosting mode.
After the compressor starts up and keeps running, mark the minimum value of T3 from the 10th
minutes to 15th minutes as T30.
1)If the compressor cumulate running time is up to 29 minutes and T3< TCDI1, T3 ＋
T30SUBT3ONE≦T30.
2)If the compressor cumulate running time is up to 35 minutes and T3< TCDI2, T3 ＋
T30SUBT3TWO≦T30.
3)If the compressor cumulate running time is up to 29 minutes and T3< TCDI3 for 3 minutes.
4)If the compressor cumulate running time is up to 120 minutes and T3<-15℃.
Condition of ending defrosting:
If any one of the following items is satisfied, the defrosting will finish and the machine will turn to
normal heating mode.
----T3 rises to be higher than TCDE1℃.
----T3 keeps to be higher than TCDE2℃ for 80 seconds.
----The machine has run for 10 minutes in defrosting mode.
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