Furnace Blower Furnace Fan Limit Switch Wiring Diagram

In some cases the limit switch will stick open and this will cause the fan to run continuously.

Furnace blower furnace fan limit switch wiring diagram.

Limit switch issue furnace blower fan wont turn off. Mac 1175 wiring diagram mgh furnace wiring diagram models mg auxiliary limit control at bottom of heat exchanger green ground screw control panel cover 3 2 1 blower receptacle 3 2 1 fan off on 3 position switch black white. Furnace fan motor wiring diagram wiring diagram for fasco blower motor valid blower motor wiring diagram lovely furnace blower motor wiring. A helical bi metal probe extends from the back of the.

Honeywell furnace temperature fan limit switch control the fan limit control turns the fan on and off in furnace applications. Furnace blower fan limit safety switch installation troubleshooting. 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. If the furnace overheats then a limit switch will open.

This control can be wired to serve as a safety limit switch on a furnace by wiring just the limit terminals on the control. Remove the wires attached to the old fan limit control. When the device is used both to control a furnace fan on and off as well as serve as a limit switch then all four terminals are. This article describes in detail the purpose operation setting installation wiring and testing of furnace combination controls also commonly called the fan limit switch on warm air heating systems.