5709L is a defrost termination switch that prevents the evaporator coil from overheating during the defrost cycle. It is an essential component of any refrigeration system that uses an electric defrost heater. In this article, we will discuss the wiring diagram of the 5709L defrost termination switch and answer some frequently asked questions about it.
Overview of the 5709L Defrost Termination Switch
The 5709L defrost termination switch is a temperature-activated switch that is designed to protect the evaporator coil from overheating during the defrost cycle. It is usually mounted on the evaporator coil and wired in series with the electric defrost heater. When the coil temperature reaches a preset level, the switch opens and interrupts the current flow to the defrost heater. This prevents the coil from overheating and ensures that the defrost cycle ends on time.
The 5709L defrost termination switch is a snap-action switch that operates on a bimetallic strip. The strip is made up of two different metals that expand at different rates when heated. This causes the strip to bend, and the switch contacts to open or close. The switch has a temperature range of -40°F to 80°F and is rated for 3 amps at 240 volts.
Wiring Diagram of the 5709L Defrost Termination Switch
The wiring diagram of the 5709L defrost termination switch is relatively simple. It consists of three wires: a black wire, a blue wire, and a white wire. The black wire is connected to one side of the defrost heater, the blue wire is connected to the other side of the defrost heater, and the white wire is connected to neutral.
| Wire Color | Description | Connection |
|---|---|---|
| Black | Heater Power | Connects to one side of the defrost heater |
| Blue | Heater Power | Connects to the other side of the defrost heater |
| White | Neutral | Connects to neutral |
Frequently Asked Questions
1. What is the purpose of the 5709L defrost termination switch?
The purpose of the 5709L defrost termination switch is to prevent the evaporator coil from overheating during the defrost cycle. It is an essential component of any refrigeration system that uses an electric defrost heater.
2. Where is the 5709L defrost termination switch usually mounted?
The 5709L defrost termination switch is usually mounted on the evaporator coil. This allows it to sense the temperature of the coil and interrupt the current flow to the defrost heater when necessary.
3. What temperature range does the 5709L defrost termination switch have?
The 5709L defrost termination switch has a temperature range of -40°F to 80°F. This allows it to operate in a wide variety of refrigeration systems.
4. What is the rating of the 5709L defrost termination switch?
The 5709L defrost termination switch is rated for 3 amps at 240 volts. This is sufficient for most refrigeration systems that use an electric defrost heater.
5. How does the 5709L defrost termination switch operate?
The 5709L defrost termination switch operates on a bimetallic strip that bends when heated. When the evaporator coil temperature reaches a preset level, the strip bends and opens the switch contacts. This interrupts the current flow to the defrost heater and prevents the coil from overheating.
Conclusion
The 5709L defrost termination switch is a critical component of any refrigeration system that uses an electric defrost heater. It prevents the evaporator coil from overheating during the defrost cycle and ensures that the defrost cycle ends on time. By understanding the wiring diagram of the 5709L defrost termination switch and its operation, you can ensure that your refrigeration system is operating correctly and efficiently.
