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4.2. Defrost Control
4.2.1. Calculating defrost starting time
According to this;
a) If ATC < 23 °C
Fix the defrost cycle to 16 hours (running + stopping)
b) If 23 °C < ATC < 28 °C
If door is not opened;
First Defrost cycle time will be fixed to 16 hours.
Second defrost cycle time will be fixed to 20 hours.
For next defrosts:
If doors isn’t opened during defrost cycle time;
fix the defrost cycle to 30 hours (running + stopping)
c) If 28 °C > ATC ≥ 35 °C
If doors isn’t opened during defrost cycle time;
defrost cycle is max. 8 hours of compressor running accumulated time (max at non door opens & close operation) or 16 hours of
total time (runnig+stopping)
d) ATC ≥ 35 °C ;
If doors isn’t opened during defrost cycle time;
defrost cycle is max. 12 hours of compressor running accumulated time or 16 hours of total time (running+stopping)
Checking of ambient temperature will be done every 10 min
Defrost conditions (durations) can be changed according to new ATC.
Step 1. When defrost accumulated time
reach to appointed time;
Check if FCC sensor temp. < compressor OFF temp,
If YES, go to step 2 (1)
If NO and compressor running accumulated time
is longer than 45min. go to step2. (2)
If NO and compressor running accumulated time
is not longer than 45min. return to step1 (3)
Step 2. Set compressor OFF and evaporator fan motor ON. Wait 3 min. and start defrosting.
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