All automatic frost refers to the refrigerator in the process of defrosting, do not need to operate any button or switch, you can automatically complete a series of defrosting operation. All automatic frost device has 3 kinds of forms: basic automatic Frost device, accumulate formula automatic frost device, whole automatic frost device. The timer used in the whole automatic frost device is called defrosting timer, which is composed of micro motor, gearbox, cam, movable contact and static contact, and is equipped with 4 terminals and a hand-controlled knob.
The defrosting timer in the circuit is adjusted at intervals of 8h (according to the design of the manufacturer, the time varies).
After the compressor runs 8h, the defrosting timer breaks into the circuit of the compressor, connects the double metal Flake frost temperature controller and the defrosting heater circuit, Defrost Timer Relay and begins to heat the evaporator. defrosting Timer control time is generally 15~ 30min.
The evaporator surface frost melts, the box temperature rises to 10~16℃, the bimetal frost temperature control device disconnects the frost contact, Defrost Timer Relay the defrosting heater stops heating, at this time the defrosting timer starts the next cycle timing.
Defrost timer is automatic frost, do not manually to adjust, usually the refrigerator compressor run cumulative to the rated working time value (about 8 hours), defrost timer will automatically turn to the status of Frost, stop the compressor operation, electrify heating cream heating tube. Defrost Timer Relay After the defrosting is finished, defrost timer will automatically turn into refrigeration state, blackout heating pipe, electric power compressor.
defrosting timer is the control of the original frost heater work, the air-cooled refrigerator is also known as frost-free refrigerator, when defrosting timer will give the defrosting heater power to achieve the function of defrosting, in fact, do not use artificial defrosting rather than real frost, Defrost Timer Relay it calculates the working cycle of the compressor, the defrosting circuit is to automatically defrost the refrigerator function, the general cumulative compressor work 8 hours will execute the Frost command, at this time the compressor does not work the frost circuit only in the air-cooled refrigerator.
How to repair defrost timer
If the compressor is not running, it may be the defrosting timer has failed. Defrost Timer Relay This part is located near the compressor. The method for detecting defrosting timers is as follows:
1 Unplug the power from the fridge.
Step 2: Disconnect the wire between the timer and the timer motor. Unscrew the two positioning screws and remove the timer from the bracket.
Step 3: Set the multimeter to RX1 file, test defrost timer. The two probes of the multimeter are clamped on two wires of the defrosting timer (not the motor), and then the screw control axis of the timer is rotated until it clicks. If there is no problem with the defrosting timer, the meter reading should be zero; Defrost Timer Relay If the pointer moves to a different location, the defrosting timer is faulted. Please replace it with a new timers of the same type.