Furnace Blower Furnace Fan Limit Switch Wiring Diagram

How to wire a furnace or ac blower motor.

Furnace blower furnace fan limit switch wiring diagram.

The white wire connects to the w terminal the yellow wire connects to the y terminal and the common wire is used with digital thermostats and is usually black or blue. Assortment of furnace fan motor wiring diagram. Here the furnace limit switch is controlling a line voltage device. The fan or furnace blower motor is controlled by the two left connections green dots.

Furnace fan limit switch wiring diagram wiring diagram is a simplified tolerable pictorial representation of an electrical circuit it shows the components of the circuit as simplified shapes and the power and signal connections amongst the devices. Diagram b fan control wiring in old style us series heaters with serial numbers having prefix d motor overload switch takes place of limit control by breaking cir multiple furnace installation may use a group of up to use the provided unit wiring diagram and the field wir dip switch 1 wiring connections w915 y1 to y2 two stage cooling w914 ds to r dehumidifi cation or harmony iii w951. Assortment of furnace blower motor wiring diagram. This video shows how to wire a furnace blower motor to an extension cord how to reverse the rotation what informa.

Step 5 run an additional wire from the furnace to the terminal in the thermostat labeled g. If the furnace is easily accessible you could mount a toggle switch on the furnace cabinet. It shows the parts of the circuit as streamlined shapes and the power as well as signal connections in between the devices. Furnace fan motor wiring diagram wiring diagram for fasco blower motor valid blower motor wiring diagram lovely furnace blower motor wiring.

The furnace limit switch which will turnoff the burner if the temperature limit is reached is controlled by the two right connections red dots. The furnace has 2 speeds low for heating and high for cooling. The fan limit switch contains a bi metallic spring shown at left which is inserted into the warm air plenum of the heating furnace. As the air in the furnace plenum warms up the bimetallic spring expands turning a gear which turns the fan limit control dial shown in the photo above.