Defrost board is an integral part of a refrigeration system that helps to regulate the defrost cycle. It is responsible for initiating and terminating the defrost cycle in the evaporator when it is required. The defrost board wiring diagram is a schematic diagram that shows the connections of the defrost board to other components in the refrigeration system. This article will provide an in-depth understanding of defrost board wiring diagram, its components, how it works, and the most common FAQs about it.
Components of Defrost Board Wiring Diagram
The defrost board wiring diagram comprises several components, including;
| Component | Description |
|---|---|
| Defrost board | A circuit board with electronic components that controls the defrost cycle by initiating and terminating it. |
| Defrost thermostat | A bimetallic switch that opens and closes the circuit to activate or deactivate the defrost cycle. |
| Defrost heater | An electrical resistance heater that melts the ice formed on the evaporator coils during the defrost cycle. |
| Evaporator fan motor | A motor that circulates air over the evaporator coils. |
| Compressor | A device that compresses the refrigerant gas to increase its temperature and pressure. |
How Defrost Board Wiring Diagram Works
The defrost board wiring diagram works in the following way;
When the temperature inside the refrigerator drops below a certain point, the defrost thermostat closes, completing the circuit between the defrost board and the defrost heater. This allows the current to flow through the heater, which starts melting the ice on the evaporator coils. The defrost board monitors the temperature and time elapsed during the defrost cycle and terminates it when the set time is reached or the temperature rises to a preset level.
After the defrost cycle ends, the defrost thermostat opens, breaking the circuit between the defrost board and the heater. The evaporator fan motor starts, circulating the air over the evaporator coils, and the compressor starts, compressing the refrigerant gas, which evaporates and absorbs heat from the refrigerated space, cooling it down. This process continues until the temperature drops below the set point, and the defrost cycle initiates again.
FAQs about Defrost Board Wiring Diagram
What causes a defrost board to fail?
A defrost board can fail due to several reasons, including;
- Power surge or voltage fluctuation
- Excessive moisture or humidity
- Corrosion or rusting of components
- Manufacturing defects or poor quality control
How can I test if my defrost board is faulty?
You can test your defrost board using a multimeter to check if there is continuity in the circuit. If the circuit is open or has no continuity, the defrost board is faulty and needs replacement.
Can I replace the defrost board myself?
Replacing a defrost board requires some electrical knowledge and expertise in handling electrical components. If you are not familiar with electrical systems, it is advisable to seek the services of a certified technician to avoid causing further damage or risking your safety.
What are the signs of a faulty defrost board?
The signs of a faulty defrost board include;
- Excessive ice buildup on the evaporator coils
- Inconsistent temperature inside the refrigerator
- Unusual noises from the compressor or fan motor
- Excessive energy consumption or high electricity bills
How often should I replace my defrost board?
The lifespan of a defrost board depends on several factors, such as the frequency of use, maintenance practices, and the quality of the components. Typically, a defrost board can last for several years, but it is advisable to replace it if you notice any of the signs of failure or after every 5-7 years to ensure optimal performance of your refrigeration system.
Conclusion
Understanding the defrost board wiring diagram is essential in maintaining and troubleshooting your refrigeration system. By knowing its components, how it works, and the common FAQs about it, you can identify and fix any issues that may arise, ensuring the optimal performance and longevity of your system.
