Understanding Thermistors in Brisbane Air Conditioning Systems
Air conditioning systems are a crucial part of any modern building, providing a comfortable and healthy environment for the occupants. One of the most critical components of air conditioning systems is the thermistor, a temperature-sensitive resistor that helps regulate the system's temperature, which is essential for staying cool in Brisbane. In this blog post, we'll take a closer look at air conditioning thermistors and how to test them to ensure optimal system performance.
What are Thermistors?
Thermistors are electronic components that are designed to measure temperature accurately. They work by changing their resistance in response to temperature changes. There are two main types of thermistors: Negative Temperature Coefficient (NTC) and Positive Temperature Coefficient (PTC). NTC thermistors have a resistance that decreases as the temperature increases, while PTC thermistors have a resistance that increases as the temperature increases. Air conditioning systems typically use NTC thermistors.
Why Test Air Conditioning Thermistors?
Testing air conditioning thermistors is essential to ensure that the system is working correctly. Faulty thermistors can lead to several problems, including inaccurate temperature readings, overcooling or overheating, and even system failure. Regular testing and maintenance of thermistors can help prevent these issues and ensure that the system is operating efficiently.
How to Test Air Conditioning Thermistors:
Testing air conditioning thermistors is relatively straightforward and can be done using a multimeter or temperature probe. Follow these steps to test a thermistor:
Turn off the power supply to the air conditioning system.
Locate the thermistor on the system's control board or sensor.
Disconnect the thermistor from the system by removing the wires that connect it.
Set your multimeter to the ohm setting or temperature probe.
Place the temperature probe on the thermistor and record the temperature reading or measure the resistance using the multimeter.
Compare the temperature reading or resistance value with the manufacturer's specifications.
If the reading or resistance value is not within the manufacturer's specifications, the thermistor is faulty and needs to be replaced. A general rule from most manufacturers is 10k ohms at 20-25 degrees celsius. As the temperature increases, the resistance decreases, so you should expect less than 20k ohms at higher temperatures (approximately 500 ohms per degree change).
What happens to my Air Conditioner has a faulty thermistor (sensor)
If a thermistor in your air conditioner is faulty, several things can happen that can affect the system's operation. Some of the consequences of a faulty thermistor include:
- The air conditioner may produce inaccurate temperature readings, leading to overcooling or overheating of the room and wasted energy usage.
- The system may short cycle, causing additional strain on the components and reducing its lifespan.
- The air conditioner's fan or compressor may fail, resulting in no cool air being produced or the system shutting down entirely.
- Frost or ice buildup can occur on the evaporator coil, reducing the system's efficiency and increasing energy consumption.
- The air conditioner may switch itself off to protect itself from damage if it believes that it doesn't have enough refrigerant, as running the system without sufficient refrigerant can cause the compressor to overheat and fail.
To prevent these issues, it's important to have your air conditioning thermistors regularly tested and maintained to ensure that they are working correctly. If you notice any signs of a faulty thermistor, such as inaccurate temperature readings or short cycling, you should seek professional to inspect your air con unit. They will diagnose and fix the problem before it leads to more significant damage to the system. For more information, check out our article on servicing air conditioning systems
Air conditioning thermistors are a vital component of any air conditioning system. Regular testing and maintenance of thermistors can help ensure that the system is functioning correctly and prevent any potential problems. If you are unsure about how to test your air conditioning thermistors, seek professional help to avoid any damage to the system. By following the steps outlined in this blog post, you can ensure that your air conditioning system is running smoothly and efficiently.