A vacuum switch in a furnace, also known as a pressure switch, is an automatic safety feature.
It is located near the motor.
Its purpose is to shut down the furnace if it detects negative pressure created by the draft inducer motor.
The pressure switch ensures proper venting and prevents the flow of gas into the combustion chamber unless it detects a vacuum.
7 Key Points to Understand What is a Vacuum Switch in a Furnace
1. How It Works
When the draft inducer motor is running, it creates a vacuum that pulls a rubber diaphragm on the pressure switch inward.
This triggers a switch on the gas valve, allowing gas to flow through.
2. Common Issues
If the pressure switch fails to trigger the gas valve even when the necessary vacuum is present, it can result from a physically damaged diaphragm or a physical blockage within the pressure switch.
3. Safety Functions
The main function of the furnace pressure switch is to limit the risk of carbon monoxide exposure and prevent furnace fires and explosions.
It does this by shutting down combustion when negative motor pressure is detected.
4. Malfunction Risks
Malfunctioning pressure switches may incorrectly detect negative air pressure due to structural issues such as ruptured or stuck diaphragm flaps.
This can impede airflow and affect pressure readings.
5. Proper Drafting
The purpose of the furnace pressure switch is to confirm that the unit is drafting properly.
If the unit is not drafting properly, it can create safety risks by not removing unwanted gases and potentially causing explosions inside the heat exchanger.
6. Types of Pressure Switches
Different furnaces may have different types of pressure switches, including high-pressure switches and low-pressure switches.
The specific type of pressure switch used depends on the size and capabilities of the furnace.
7. Importance of Reliable Switches
Looking for reliable vacuum switches for furnaces? Look no further than KINTEK!
Our high-quality pressure switches ensure safe venting by detecting negative pressure created by the draft inducer motor.
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