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Defrost Timer Design Concept
Jul 03, 2017

If the compressor is not running, it may be that the defrost timer has failed. This part is located near the compressor. The method for detecting the defrost timer is as follows:

1 Step 1: Unplug the power to the refrigerator.

2 Step 2: Disconnect the wires between the timer and the timer motor. Unscrew the two set screws and remove the timer from the bracket.

3 Step 3: Set the multimeter to RX1 to detect the defrost timer. Place the two probes of the multimeter on the two wires of the defrost timer (not the motor), and then turn the timer's screw control shaft until it clicks. Defrost Timer Relay If there is no problem with the defrost timer, the meter's reading should be zero; if the pointer goes to another position, the defrost timer is faulty. Replace it with a new timer of the same type.

Defrost timer rating: AC100 ~ 120V 50 / 60Hz AC127V 50 / 60Hz AC200 ~ 240V 50 / 60Hz Insulation resistance: ≥ 100MΩ Power consumption: 0.4-1.5W Noise: ≤ 30dB Use of the environment: temperature -20 ℃ ~ 63 ℃

Defrost timer: through the computer board memory chip or mechanical gear timing to control the refrigerator freezer frost heating wire work, Defrost Timer Relay so that the refrigerator freezer will not be frost stick, leaving the refrigerator freezer to work (only the wind Cold refrigerator only defrost function). The refrigerated evaporator of the air-cooled refrigerator is generally compactly mounted on the top or back of the freezer compartment and is covered with a guard for the outside, and is intuitive.

Refrigerator automatic defrost system consists of: defrost heating wire, temperature limiter, defrost timer components.

By the defrost timer to calculate the time, Defrost Timer Relay the temperature limiter to control the operating temperature of the heating wire to complete the final defrost task. Freezer cooling fan is and compressor, controlled by the thermostat, so during the defrosting fan is to stop working, in order to ensure that the frost period during the freezing room temperature will not change; when the defrost process is over, Defrost Timer Relay The compressor will work again, then the cooling fan will continue to work.

There is a priority between the thermostat and the defrost timer. When the defrost timer is in operation, it will cut off the power supply to the thermostat and the compressor will not operate even if the thermostat reaches the start-up temperature.

When the compressor has been working for 24-48 hours (depending on the manufacturer's design time), the defrost timer automatically operates once and the defrost timer controls defrosting time is typically 15-30 minutes.

The advantages of air-cooled refrigerators are people-oriented design concept of production, saving manpower defrosting time and labor, to prevent the defrosting method caused by improper damage to the frozen evaporator. The disadvantage is that control lines are complex, control parts more, relatively high failure rate, the price is slightly higher.


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