Furnace Blower Furnace Fan Limit Switch Wiring Diagram

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 blower furnace fan limit switch wiring diagram.

Furnace blower fan limit safety switch installation troubleshooting. Furnace fan motor wiring diagram wiring diagram for fasco blower motor valid blower motor wiring diagram lovely furnace blower motor wiring. This control can be wired to serve as a safety limit switch on a furnace by wiring just the limit terminals on the control. Honeywell furnace temperature fan limit switch control the fan limit control turns the fan on and off in furnace applications.

A helical bi metal probe extends from the back of the. 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. In some cases the limit switch will stick open and this will cause the fan to run continuously. Remove the wires attached to the old fan limit control.

Limit switch issue furnace blower fan wont turn off. 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. Wiring the furnace combination fan limit control using the honeywell l4064b as an example. If the furnace overheats then a limit switch will open.