Furnace Limit Switch Settings

It will be located at the top of the panel.

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. Most slide off or unhook for easy access. Open up the access panel on the furnace. Wood furnace fan limit switch settings.

The limit switch includes a sensor in the heat exchanger to determine. Locate your furnace s heating duct. 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.

Look for the fan limit control switch encased in a small rectangular box. It should be located near the top of. How to set a fan limit control switch step 1. 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. Heating ducts are typically located in a home s basement or utility closet. 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. Locate the white limit switch.

Look at each.