Furnace High Limit Switch Temperature Settings

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.

Furnace high limit switch temperature settings.

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. The switch is one of the easier devices and attachments on a furnace. Honeywell furnace temperature fan limit switch control the fan limit control turns the fan on and off in furnace applications. The high temperature limit switch is an important device used in forced air furnaces powered by gas or heating oil.

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 s possible to reset the switch at home when necessary by following a few simple steps. On the honeywell l4064b the limit off is set to a temperature between 100 f and 250 f. This is the highest temperature setting on a furnace combination control.

However for your own safety don t attempt to reset the switch without first consulting your furnace s instruction manual. A helical bi metal probe extends from the back of the. The switch makes sure the furnace is operating safely and at its desired settings. How to install adjust or repair the furnace fan control or furnace limit control.

It s also known as a fan limit switch or simply a limit switch. 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. The fan limit control switch on a furnace regulates when the blower will come on or shut off.