Defrost timers are important components in refrigeration systems. They help to regulate the cooling cycle and prevent frost buildup on the coils. One of the most popular defrost timers in use today is the 8145 20 defrost timer. This article will provide a comprehensive guide on how to wire the 8145 20 defrost timer.
Overview of the 8145 20 Defrost Timer
The 8145 20 defrost timer is a mechanical timer used in commercial refrigeration systems. It is designed to control the defrosting process of the evaporator coils. The timer is made up of multiple pins that are used to control the timing of the defrost cycle. These pins are adjustable and can be set to the desired defrost frequency and duration.
The 8145 20 defrost timer is a popular choice among refrigeration technicians due to its ease of use and reliability. It is suitable for use in various applications, including walk-in coolers, reach-in freezers, and other commercial refrigeration systems.
Defrost Timer Wiring Diagram
Wiring the 8145 20 defrost timer is a straightforward process that requires some basic knowledge of electrical wiring. The wiring diagram for the 8145 20 defrost timer is shown below:
| Pin Number | Wire Color | Description |
|---|---|---|
| 1 | Black | Line / Hot |
| 2 | White | Neutral |
| 3 | Green | Ground |
| 4 | Blue | Compressor |
| 5 | Red | Defrost Heater |
| 6 | Orange | Termination / Fan Delay |
The 8145 20 defrost timer has six pins that are used to control various aspects of the refrigeration system. Pin 1 is for the line or hot wire, while pin 2 is for the neutral wire. Pin 3 is for the ground wire, while pins 4, 5, and 6 are for the compressor, defrost heater, and termination/fan delay, respectively.
The wiring diagram should be followed carefully when wiring the 8145 20 defrost timer. Incorrect wiring can lead to system failure or even electrical shock. It is recommended that a licensed professional or experienced technician perform the wiring to ensure proper installation and safety.
FAQs
Q: How does the 8145 20 defrost timer work?
A: The 8145 20 defrost timer works by controlling the timing of the defrost cycle. It has adjustable pins that are set to a specific defrost frequency and duration. When the timer reaches its set defrost time, it interrupts power to the compressor and turns on the defrost heater. This melts any frost buildup on the evaporator coils, allowing the system to function efficiently.
Q: What is the importance of the 8145 20 defrost timer in a refrigeration system?
A: The 8145 20 defrost timer is an essential component of a refrigeration system. It helps to prevent frost buildup on the evaporator coils, which can cause the system to work inefficiently. Additionally, it prolongs the lifespan of the refrigeration system by reducing wear and tear on the components.
Q: How often should the 8145 20 defrost timer be set to defrost?
A: The frequency of defrost cycles will depend on the specific requirements of the refrigeration system. Generally, once every six to eight hours is sufficient for most applications. However, larger systems or those in high-humidity environments may require more frequent defrosting.
Q: How can I troubleshoot issues with my 8145 20 defrost timer?
A: If you are experiencing issues with your 8145 20 defrost timer, it is recommended that you consult a licensed professional or experienced technician. They will be able to diagnose and troubleshoot any issues with the timer and ensure proper functioning of the refrigeration system.
Q: Can the 8145 20 defrost timer be used in residential refrigeration systems?
A: The 8145 20 defrost timer is primarily designed for use in commercial refrigeration systems. However, it may be suitable for use in larger or more complex residential refrigeration systems. It is recommended that you consult a licensed professional or experienced technician to determine whether the timer is suitable for your specific application.
Q: What are the advantages of using the 8145 20 defrost timer?
A: The 8145 20 defrost timer has several advantages, including ease of use, reliability, and cost-effectiveness. It is also suitable for use in various applications and can help to prolong the lifespan of refrigeration systems by reducing wear and tear on the components.
Conclusion
The 8145 20 defrost timer is an important component in commercial refrigeration systems. It helps to regulate the defrosting process of the evaporator coils, preventing frost buildup and ensuring efficient system functioning. Proper wiring of the defrost timer is essential for safety and proper functioning of the system. If you are experiencing issues with your 8145 20 defrost timer, it is recommended that you consult a licensed professional or experienced technician for proper diagnosis and troubleshooting.
