Chi تايمر ثلاجه نوفروست صينى 7 دقيقه ديفروست

A defrost Timer opens the heater circuit after 7HRs Compressors work time , it works to defrost ice on the evaporator for 7 min , actually mealting ice take more than 20 min in the refrigerator , but the  circuit of the refrigerator makes the extra delay time 

The defrost timer has four pins labeled from 1 to 4. Each pin has its own function in the operation of the timer.

Pin 1: The main input power is attached to pin 1.
Pin 2: When in defrost mode, the power (pin 1) connects to pin 2, which activates the defrost mode. Most defrost timers stay in defrost mode for 30 minutes.
Pin 3: This is your ground / neutral wire. It will be separated from the other three pins.
Pin 4: When the timer is not in defrost mode, the power (pin 1) connects to pin 4, which activates the compressor and fan. Most timers stay in this mode for 10 hours.