Furnace Blower Furnace Fan Limit Switch Wiring Diagram

That will cause the burners or heat source to shut off and the fan to run until the limit switch closes again.

Furnace blower furnace fan limit switch wiring diagram.

If the furnace overheats then a limit switch will open. A helical bi metal probe extends from the back of the. Furnace blower fan limit safety switch installation troubleshooting. Honeywell furnace temperature fan limit switch control the fan limit control turns the fan on and off in furnace applications.

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 fan motor wiring diagram wiring diagram for fasco blower motor valid blower motor wiring diagram lovely furnace blower motor wiring. In some cases the limit switch will stick open and this will cause the fan to run continuously. 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.

Assortment of furnace fan motor wiring diagram. Remove the wires attached to the old fan limit control. Limit switch issue furnace blower fan wont turn off. This control can be wired to serve as a safety limit switch on a furnace by wiring just the limit terminals on the control.