Furnace High Limit Switch Temperature Settings

What ois a furnace limit switch.

Furnace high limit switch temperature settings.

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

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. 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. 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.

However for your own safety don t attempt to reset the switch without first consulting your furnace s instruction manual. It s also known as a fan limit switch or simply a 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. The high temperature limit switch is an important device used in forced air furnaces powered by gas or heating oil.

How to install adjust or repair the furnace fan control or furnace limit control. The switch is one of the easier devices and attachments on a furnace. The fan limit control switch on a furnace regulates when the blower will come on or shut off.