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What Is A Limit Switch Hvac
What Is A Limit Switch Hvac. The limit switch is a safety control switch located on the furnace just below the plenum. The fan limit switch also has two other functions.

Sometimes referred to as a furnace fan limit switch, a limit switch is responsible for triggering the fan to turn on in a forced air furnace. If the plenum gets too hot, the limit switch shuts off the burner. It’s a small plate with arms that keeps furnace (and indoor) temperature limits, beyond which the switch can call for heating or shut off the furnace.
The Fan Limit Switch Also Has Two Other Functions.
Once it reaches a certain point, it will activate and turn off power to the heating system before an overheating scenario can develop into a hazardous residential fire. This is so that it can detect the temperature of the supply air. Furnace limit switches are usually used in gas furnaces and air conditioners to turn off the furnace or air conditioner when a temperature sensor or switch has been activated.
Without A Functioning Furnace Limit Switch, A Furnace Would Not Be Able To Regulate The Temperature In Conjunction With A Thermostat.
When your furnace is working correctly, you shouldn’t have to worry about your furnace limit switch. Definition of a fan limit switch. It turns the fan on and off during the normal heating cycles of the furnace, and it.
What Is The Limit Switch On A Furnace?
Sometimes referred to as a furnace fan limit switch, a limit switch is responsible for triggering the fan to turn on in a forced air furnace. A fan limit switch is a component of a furnace system that determines when the furnace blower assembly for hot air turns on and off. Fan/limit switches are used on all types of heating furnaces.
Also Known As The Fan Limit Switch Or Simply The Limit Switch, It Has Two Functions In The Furnace's Operation:
If the plenum gets too hot, the limit switch shuts off the burner. It reads the temperature of the plenum and waits until it gets appropriately warm. In order to perform a proper test, you need a known working sensor or switch to verify its functionality.
A Limit Switch Is A Device That’s Designed To Regulate A Furnace’s Blower And Protect The Furnace From Overheating.
From the mounting plate, the switch is wired to the blower fan motor and to the gas valve. Once the plenum reaches a specific temperature, the limit switch sends a signal to the air handler to begin running and delivering warm air to your home. The blower lives up to its namesake by blowing air over the heating element.
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