Gas Furnace Fan Limit Switch

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Gas furnace fan limit switch.

Additionally when the plenum gets too hot the high limit switch will shut off the gas supply to the furnace burners. The switch makes sure the furnace is operating safely and at its desired settings. Over time your furnace s limit switch can develop problems. In many models it also has a built in safety control for the burner to shut off at higher temperatures if the burner s inner control malfunctions.

The oil fired furnace fan limit switch shown in our photo below is in use on an oil fired warm air furnace where we can see about 3 4 of the silver colored dial where the fan limit switch settings are made red arrow. Honeywell furnace 5 combo fan limit switch l4064b3432 us stove wood coal. Free shipping by amazon. 4 4 out of 5 stars 167.

Only 11 left in stock order soon. 4 3 out of 5 stars 39. The gas fired forced air furnace fan limit switch in the photo below is pointed to by the red arrow. 7975 3281 coleman oem furnace replacement fan switch f110.

Fan control limit switch the fan switch reads the temperature inside a furnace and once the temperature becomes warm enough turns the blower motor on sending warm air into a home. It s also known as a fan limit switch or simply a limit switch. Some furnaces provide extra safety features by wiring two or three high limit switches in a series that check the temperature in the furnace at different points. The high temperature limit switch is an important device used in forced air furnaces powered by gas or heating oil.

The fan limit control switch on a furnace regulates when the blower will come on or shut off. This is used so that cold air is not blown into a house waiting for the gas flames to heat up enough before the blower turns on. A limit switch also acts as a safety device for your furnace. If the temperature inside of the plenum gets too hot it shuts off the gas supply to your burners to prevent your furnace and heat exchanger from overheating.

Just as it determines when the blower assembly should turn on it will also determine when it should turn off. What happens if your furnace limit switch stops working properly. The fan limit switch also has two other functions. 37 new refurbished from 45 00.

Honeywell l4064b2236 combination fan and limit furnace control. It also determines if the furnace should be shut down in the case of overheating. How a fan limit switch works. The switch is one of the easier devices and attachments on a furnace.

Get it as soon as sun oct 4. 4 5 out of 5 stars 20. A fan limit switch consists of the following components.