If you are looking for a guide on how to wire a fridge thermostat, you have come to the right place. In this article, we will discuss the three-wire fridge thermostat wiring diagram in detail. This article is aimed at beginner-level electricians who want to understand how to wire a fridge thermostat with a three-wire setup.
What is a fridge thermostat?
Before we dive into the wiring diagram, let us first understand what a fridge thermostat is. A fridge thermostat is responsible for regulating the temperature inside your fridge. It ensures that your fridge maintains a consistent temperature, which is essential for keeping your food fresh.
When the fridge temperature rises above the set point, the thermostat switches on the compressor, which then pumps refrigerant into the evaporator. The evaporator then cools the air inside the fridge, bringing the temperature back down to the desired level.
What are the three wires in a fridge thermostat?
Before we begin wiring the fridge thermostat, let us identify the three wires that we will be working with. These wires are:
- Neutral wire
- Live wire
- Switched live wire
The neutral wire is typically colored blue and is responsible for completing the circuit. The live wire is usually colored brown and carries the electrical current. The switched live wire is typically colored red and is responsible for switching the compressor on and off.
How to wire a fridge thermostat?
Now that we have identified the wires, let us begin wiring the fridge thermostat. Follow these steps carefully:
Step 1: Safety first
Before you begin wiring, ensure that the power supply to the fridge is disconnected. This is essential to prevent any accidents or electrical shocks.
Step 2: Remove the old thermostat
If you are replacing an old thermostat, remove it carefully. Use a screwdriver to remove the screws holding the thermostat in place.
Step 3: Identify the wires
Identify the three wires that we mentioned earlier. If your wires are not colored, use a multimeter to identify the neutral wire, live wire, and switched live wire.
Step 4: Connect the wires to the new thermostat
Connect the neutral wire to the neutral terminal of the new thermostat. Connect the live wire to the live terminal. Connect the switched live wire to the terminal marked ‘com’ on the thermostat.
Some fridge thermostats come with a fourth terminal, which is marked ‘NC’ (normally closed). If your thermostat has this terminal, connect the switched live wire to this terminal instead of the ‘com’ terminal.
Step 5: Test the new thermostat
Once you have connected the wires, switch on the power supply to the fridge and test the new thermostat. Set the temperature to the desired level and wait for a few minutes. The compressor should switch on and off as required to maintain the temperature.
Frequently Asked Questions
Q: Can I wire a fridge thermostat with two wires?
A: Yes, you can wire a fridge thermostat with two wires. However, this requires a slightly different wiring diagram. We recommend that you consult an expert electrician if you are not confident about wiring a two-wire thermostat.
Q: Can I use any fridge thermostat to replace my old one?
A: No, you cannot use any fridge thermostat to replace your old one. The new thermostat must be compatible with your fridge model and make. We recommend that you consult the manufacturer’s instructions or consult an expert before purchasing a new thermostat.
Q: What should I do if the thermostat does not work after installation?
A: If the new thermostat does not work after installation, first check the wiring to ensure that all connections are tight and secure. If the wiring is correct, check the voltage supply to the fridge. If the voltage supply is correct and the thermostat still does not work, it is likely that the thermostat is faulty and needs to be replaced.
Conclusion
In conclusion, wiring a three-wire fridge thermostat is a simple process if you follow the steps carefully. Ensure that you take all necessary safety precautions before you begin wiring. If you are not confident about wiring a fridge thermostat, we recommend that you consult an expert electrician.
| Neutral wire | Live wire | Switched live wire |
|---|---|---|
| Blue | Brown | Red |
