Furnace Fan Limit Switch Wiring

This is used so that cold air is not blown into a house waiting for the gas flames to heat up enough before the blower turns on.

Furnace fan limit switch wiring.

When the temperature dial on the fan limit switch has rotated enough to represent a pre set temperature the fan on temperature setting the the fan limit switch turns on the furnace blower fan. This eliminates or limits cold air from. It shows the components of the circuit as simplified shapes and the gift and signal connections together with the devices. Then the furnace blower motor turns on.

Thanks for the info. Wiring the furnace combination fan limit control using the honeywell l4064b as an example. Furnace limit switch wiring diagram wiring diagram is a simplified gratifying pictorial representation of an electrical circuit. How it works honeywell furnace temperature fan limit switch control.

I had to replace the ductwork on my blower furnace fan and i accidentally unwired the limit switch so now my fan continuously runs could someone tell me which wire is the fan limit switch or how the furnace should be wired it s an oil furnace. The blower fan moves warm air into the occupied space. I ll inspect the relay for possible problems. It is in parallel with the safety and gas valve circuit.

The blower fan starts when the fan limit switch turns it on. This control can be wired to serve as a safety limit switch on a furnace by wiring just the limit terminals on the control. When the furnace heat exchanger heats up the bimetal twists causing the round dial shown in the picture to turn. On 2016 12 06 by bill.

Fan control limit switch the fan switch reads the temperature inside a furnace and once the temperature becomes warm enough turns the blower motor on sending warm air into a home. Based on where the manual selection switch is set when it reaches the manual setting contacts inside the switch close. This provides a time delay for the fan to come on which allows the furnace heat exchanger to heat up. The limit switch is a safety switch that monitors t.

The 2 wires are yellow and the schematic shows one going into the fan limit switch in the bottom center goes through a heating resistor fan assist and exits. It is diagramed as a resistor but is called my the 2 names heating resistor fan assist.