Fan Limit Switch Temperature Settings

An on off switch for the blower fan.

Fan limit switch temperature settings.

A fan limit switch consists of the following components. It is a round silver tin disc with a temp. Most slide off or unhook for easy access. An adjustable fan limit controller typically is designed for furnaces operating at temperatures from 100 f to 250 f has a fan off lower limit that can be adjusted from 50 f to 200 f a fan on switch adjustable from 65 f to 215 f and a fan high limit stop set at 200 f.

My guess is 205f. Jul 24 2007 10 06 am the limit switch would be set about 180 degrees this is the off temp the fan switch would be set to come on at 135 and go off at 100 to 105 degrees. Range at the bottom. A temperature sensor within the furnace.

Is the he limit. Open up the access panel on the furnace. This switch may have to be fine tuned to keep the fan from coming on during summer and to keep the fan from short cycling during normal operation. What are the correct temperature settings for a fan limit switch.

How to set a fan limit control switch step 1. The three settings from low to high are 80f. And the high limit is 130f. A control which turns the blower fan on or off depending on the air temperature within the furnace.

A high limit setting which turns off the heat source or burner. The the low limit is 80f.