Electrolux AND42391W Manuale di servizio - Pagina 20
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6.3 Defrosting
All the humidity in the compartment accumulates on the evaporator, which is the coldest part of the compart-
ment; periodically, about every 14 hours with normal door opening (up to 72 hours if the doors never open!), it
is then necessary to defrost the ice on the battery.
The defrosting starts after the compressor cut-out or if the compressor is on after 2,5 hours max.
The electronic board disconnects immediately the circuit that powers the compressor and the fan, waits 3 min-
utes and then it powers the circuit of the defrosting heater for a minimum time of about 20 minutes.
The heat generated by the defrosting heater does not affect the freezer compartment temperature or the food
packages temperature, because the thermal energy is consumed in the defrosting process of the evaporator
ice.
After 20 minutes, the electronic board checks the state of the thermal switch of the end of defrosting every
minute to detect the cut-out.
When the switch of the end of defrosting cuts out, the electronic PCB stops the defrosting procedure and the
compressor as well as the fan do not operate until 60 minutes from the beginning of the defrosting cycle have
elapsed.
If for any reason, the defrosting cut-out switch does not switch on and the battery temperature rises up to 40
°C, the defrosting heater will be switched off by the safety thermal switch.
If 1 hour after the starting of the defrosting, the thermal switches did not cut out, the electronic board switches
the defrosting heater off in any case and continues its operation.
The electronic PCB activates the compressor and the fan only 60 minutes after the beginning of the defrosting
procedure
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