Furnace High Limit Switch Temperature Settings

It s also known as a fan limit switch or simply a limit switch.

Furnace high limit switch temperature settings.

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

A helical bi metal probe extends from the back of the. 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. Furnace fan limit switch control.

However for your own safety don t attempt to reset the switch without first consulting your furnace s instruction manual. The switch is one of the easier devices and attachments on a furnace. On the honeywell l4064b the limit off is set to a temperature between 100 f and 250 f. The fan limit control switch on a furnace regulates when the blower will come on or shut off.

This is the highest temperature setting on a furnace combination 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.