Electric Furnace Limit Switch

Two in a upper rack 9kw.

Electric furnace limit switch.

Depending on your furnace model the switch will be surrounded by a silver or white cover. The limit switch plays an important role in every normal cycle of the furnace. Function of the limit switch. Element is 13 deep.

It looks like it will fit. A limit switch is a device that s located under your furnace s supply plenum. This element is used in the eb17c and eb17d electric furnaces. If the blower came on at the same time as the burner it would pump cold air through the house at first.

It will be located at the top of the panel. Once the plenum reaches a specific temperature the limit switch sends a signal to the air handler to begin running and delivering warm air to your home. Also known as part number 5000 269 502 and 266186. It reads the temperature of the plenum and waits until it gets appropriately warm.

Initially the air above the heat exchanger in the supply plenum is not warm enough to blow into the house so the limit switch keeps the blower off. High limit switch a high limit control switch will turn off the gas to a furnace if the temperature becomes too high. The limit switch includes a sensor in the heat exchanger to. There s apparently three coils.

The furnace model tag has been painted over and the limit switch has blew a terminal off and i m not able to cross reference the limit switch. Out of shear desperation i ordered a supco l180 20 limit switch. So to put it simply the limit switch tells the furnace fan when to turn on and when to shut off and it tells the furnace to shut down if it is overheating. A furnace has two switches called a fan limit switch and a high limit switch these switches can be separate or in one package called a combination 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. Locate the white limit switch. When the thermostat calls for heat the furnace burners ignite and begin heating the heat exchanger. Front mounting plate measures 10 75 x 3 25.