Furnace Limit Switch Settings

The limit switch includes a sensor in the heat exchanger to determine.

Furnace limit switch settings.

Look for the fan limit control switch encased in a small rectangular box. Slide the cover off the control switch. Look at each. Locate the white limit switch.

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. What is a high temperature limit switch on furnace help me understand how my furnace wood work together furnace fan limit switches electrorientesa co max caddy wood furnaces fcflc 5 fan limit control fire chief furnace. By saum hadi posted on october 15 2018. It will be located at the top of the panel.

The other important function of the limit switch is to shut off the burners if the heat exchanger gets too hot a condition that can crack the piping in the exchanger effectively ruining the furnace. Open up the access panel on the furnace. Wood furnace fan limit switch settings. It should be located near the top of.

Locate your furnace s heating duct. Heating ducts are typically located in a home s basement or utility closet. Most slide off or unhook for easy access. How to set a fan limit control switch step 1.

Limit switch functions if the blower came on at the same time as the burner it would pump cold air through the house at first.