Furnace High Limit Switch Temperature Settings

This is the highest temperature setting on a furnace combination control.

Furnace high limit switch temperature settings.

The switch makes sure the furnace is operating safely and at its desired settings. The high temperature limit switch is an important device used in forced air furnaces powered by gas or heating oil. Furnace fan limit switch control. 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.

Honeywell furnace temperature fan limit switch control the fan limit control turns the fan on and off in furnace applications. On the honeywell l4064b the limit off is set to a temperature between 100 f and 250 f. However for your own safety don t attempt to reset the switch without first consulting your furnace s instruction manual. The function of your furnace limit switch is to tell the fan when to turn off and on depending on the temperature in the home.

It works off of temperature and also provides a high temperature safety limit this is a switch actually two switches which turns the furnace blower on and off based on the temperature of the heat exchanger. A helical bi metal probe extends from the back of the. How to install adjust or repair the furnace fan control or furnace limit control. What ois a furnace limit switch.

It is set to the furnace warm air temperature at which this safety switch is to turn off the oil or gas or other burner or heat source. Here is a complete guide to the fan limit switch settings manual fan override temperature settings for warm air heating furnaces heating furnace controls switches. It s possible to reset the switch at home when necessary by following a few simple steps.