Furnace Limit Switch Settings

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. Open up the access panel on the furnace. Look at each.

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Wood furnace fan limit switch settings.

Furnace limit switch settings.

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

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. Depending on your furnace model the. Locate your furnace s heating duct. Slide the cover off the control switch.

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. By saum hadi posted on october 15 2018. When the air in the supply plenum drops to the lower setting on the limit switch the switch shuts off the fan until the next cycle begins. It should be located near the top of.

Look for the fan limit control switch encased in a small rectangular box. The limit switch includes a sensor in the heat exchanger to determine. 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. How to reset a furnace limit switch step 1.

It will be located at the top of the panel.

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