Furnace Fan Limit Control Switch Settings

The fan limit control switch on a furnace regulates when the blower will come on or shut off. 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 switch is one of the easier devices and attachments on a furnace.

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The fan limit switch temperature settings shown on the dial sketch are discussed separately.

Furnace fan limit control switch settings.

At fan limit control settings. Faqs on settings for a furnace fan limit control switch. Assure that the control has been installed and wired in accordance with the manufacturer s installation instructions using the following procedures. How to check the furnace fan limit control switch wiring.

On 2018 11 10 17 01 41 794710 by mod. These questions and answers about making the proper settings on a fan limit controller or troubleshooting that control were posted originally at fan limit control settings be sure to read that article too. By keeping the fan off until the supply air plenum is warm the heating furnace limit switch prevents the furnace blower from sending chilly air into the building if the oil or gas burner has not sufficiently heated up the furnace heat exchanger and supply air plenum. The average consumer can both locate and set the fan limit control switch with ease.

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