Defrosting - Electrolux 4-Door Refrigerator with R600a Service Manual

6.2. Defrosting

The evaporator is the coldest part of the compartment, and it is here that all the humidity inside the compartment
tends to accumulate. As a result, it is necessary to defrost the battery at periodic intervals of about 12 hours,
therefore, the timer switches from contact 3-2 to contact 3-4, switching off the compressor and the fan and
switching the defrosting heating element (9) on and at the same time also the heating element beneath the water
drain duct. (11).
The heat produced by the heating element does not increase the temperature inside the freezer compartment,
because it is entirely absorbed during the defrosting process of the ice on the evaporator.
When the battery reaches +10°C, the end-of-defrosting thermal switch (27) switches off the defrosting heater,
but leaves the water duct heater on. If for any reason, it does not switch on and the battery temperature rises up
to +40 °C, the heating elements will be switched off by the safety thermal switch (26).
After about 11 minute defrosting, the timer switches to contact 3-2 again switching the compressor and the fan
on and switching the heating elements off.
The arrows in the picture indicate the current path.
4 DOOR REFRIGERATOR WITH R600a 17/22