A furnace air pressure switch is a critical safety component designed to prevent the risk of carbon monoxide exposure and furnace fires or explosions.
It operates by monitoring the air pressure within the furnace and automatically shutting down the combustion process if negative motor pressure is detected.
This ensures that the furnace does not operate if there is a risk of back drafting, where exhaust gases are drawn back into the living environment instead of being expelled outside.
5 Key Points to Know About Furnace Air Pressure Switches
1. Functionality of the Furnace Pressure Switch
The pressure switch works by sensing the airflow or draft in the furnace.
When the furnace's blower motor starts, it creates a vacuum that pulls air through the furnace and out the flue.
This vacuum is detected by the pressure switch through a rubber tube connected to it.
If the pressure switch detects the correct amount of suction, it closes a circuit, allowing power to flow to the igniter and enabling the furnace to operate.
If the pressure switch does not detect the correct suction, it remains open, preventing the furnace from igniting and thereby preventing potential hazards.
2. Types of Pressure Switches
There are different types of pressure switches depending on the type of furnace.
Single-stage furnaces typically have one pressure switch, while two-stage furnaces have two.
Two-stage furnaces require different levels of ventilation for their different heat outputs and thus need a dual pressure switch setup.
This can be either a "pancake" switch, where two switches are stacked together, or two separate switches, one for low pressure and one for high pressure.
3. Importance of Negative Air Pressure Detection
Negative air pressure in a furnace can lead to back drafting, a dangerous condition where exhaust gases are pulled back into the home.
The pressure switch detects this negative pressure and shuts down the furnace to prevent this from happening.
This is crucial for maintaining a safe environment within the home, as carbon monoxide and other harmful gases can be deadly if inhaled.
4. Malfunctioning Pressure Switches
If a pressure switch malfunctions, it may incorrectly detect negative air pressure due to issues like a ruptured or stuck diaphragm.
This can impede airflow and lead to inaccurate pressure readings.
In such cases, it is essential to repair or replace the pressure switch to ensure the furnace operates safely.
5. Impact on Home Envelope
In some cases, pressure switch problems may indicate broader issues with the home's envelope, or overall airtightness.
Tightening the home's envelope by adding insulation or sealing air leaks can help reduce the furnace's energy consumption and minimize the risk of negative pressure issues.
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