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A refrigerator defrost timer is a vital component of a refrigerator’s cooling system. It plays a crucial role in preventing ice buildup in the freezer compartment, ensuring efficient operation and increasing the lifespan of the appliance. In this article, we will delve into the structure, function, and principle of operation of a refrigerator defrost timer, providing a comprehensive understanding of its significance in maintaining optimal refrigeration performance. Whether you are a homeowner trying to fix a defrosting issue or simply curious about the inner workings of your refrigerator, this article will introduce you to the key aspects of a refrigerator defrost timer.
Refrigerator defrost timer is a device that helps control the heating, cooling, and defrosting process of the refrigerator so that the refrigerator always works stably. Let’s find out what the refrigerator defrost timer is, as well as its structure, function and operating principle through the following article!
What is a Refrigerator Defrost Timer?
Refrigerator defrost timer is a device that controls the heating, cooling and defrosting process of the refrigerator, ensuring that the refrigerator always keeps the right temperature, stable operation, and does not cause the indoor unit to close. snow.
Structure and working principle of refrigerator defrost timer
Structure
Timer is composed of:
- 1 single-phase AC motor M: Acts as a compressor motor.
- Engine shaft.
- Gear reduce transmission speed.
- 1 cam wheel has a speed of 1 revolution / 24h.
Working principle
- When you supply power to the refrigerator, the timer contacts 1 – 4 will close, instead the motor M will rotate to defrost time.
- Next, the camshaft will act so that contacts 1 – 4 of the timer open and close contacts1 – 2 .
- When current passes through relay -7 , fuse 70 and through the resistor wire, the resistor wire will heat up the evaporator to trigger defrost.
- However, when the evaporator temperature is greater than – 7 degrees Celsius , relay -7 will open the contact to stop supplying power to the defrost resistor.
- At this time, the timer with resistor will continue to rotate, 15 minutes later, contacts 1 – 2 of the timer will open and close contacts1 – 4 to supply power to the refrigerator compressor to continue performing the process. chilled.
Location of refrigerator defrost timer
Refrigerator defrost timer can be located in the vegetable compartment or on the back of the refrigerator in the electrical box next to the compressor depending on the refrigerator model.
Function of the refrigerator defrost timer
The refrigerator defrost timer has the function of disconnecting the power supply to the compressor instead of supplying power to the defrost resistor to melt the ice on the indoor unit.
How to check if the refrigerator defrost timer is still good or not?
To check if the defrost timer is still good, do the following:
- Use a scale meter to measure the resistance and measure between the coil legs ( pins 1 and 3 ). Then you rotate the timer shaft until there is a ” beep ” sound and continue to measure the resistance at the contact that powers the defrost system ( resistance between pins 3 and 2 ).
- When the resistance is about a few Ohm, turn the shaft slightly until the second ” beep ” appears and measure the resistance between pins 3 and 4 – which is the power supply contact for the compressor.
The above article has provided you with information about what is a refrigerator defrost timer as well as its structure, function and operating principle for you to better understand this device. If you have any questions, leave us a comment below for answers!
In summary, a refrigerator defrost timer is an essential component of a refrigerator that plays a crucial role in preventing frost buildup in the freezer compartment. Its main function is to initiate periodic defrost cycles to melt any ice or frost that may accumulate on the evaporator coils. The defrost timer operates based on a specific time interval, typically every 8 to 12 hours, depending on the model and manufacturer.
The structure of a defrost timer typically consists of a motorized clock mechanism, which allows it to keep track of time accurately. It also includes a set of electrical contacts or switches that control the different operational modes of the refrigerator – cooling and defrosting. These contacts enable the timer to regulate the power supply to the compressor and the heating element responsible for defrosting.
The principle of operation of a defrost timer revolves around cycling between two modes: cooling and defrosting. During the cooling mode, the timer allows the compressor to run continuously, maintaining the desired temperature inside the refrigerator. However, after a specified time, the timer switches to the defrost mode, temporarily interrupting the compressor and activating the heating element. This causes the ice or frost on the evaporator coils to melt, draining away through the defrost drain, and preventing excessive buildup that could lead to cooling inefficiencies.
Overall, a refrigerator defrost timer is vital in maintaining the optimal performance of a refrigerator by preventing frost accumulation. Its structure, function, and principle of operation work harmoniously to ensure timely defrost cycles, thereby prolonging the lifespan of the appliance and promoting energy efficiency. Understanding the importance of the defrost timer allows users to appreciate its role in preserving the freshness and quality of stored food items, while also minimizing the need for manual defrosting efforts.
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