Hvac Fan Limit Switch Location

Honeywell furnace temperature fan limit switch control the fan limit control turns the fan on and off in furnace applications.

Hvac fan limit switch location.

A helical bi metal probe extends from the back of the. By saum hadi posted on august 31 2018. To restore the furnace to normal operation you must reset the switch on the blower motor. 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.

It reads the temperature of the plenum and waits until it gets appropriately warm. Goodman gms81005cn 100 000 btu furnace 80 efficiency single. Goodman gmt115 5 fan randomly turns on doityourself. The gas fired forced air furnace fan limit switch in the photo below is pointed to by the red arrow.

Just as it determines when the blower assembly should turn on it will also determine when it should turn off. 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. Test and replace the fan limit switch on a furnace hvac how to. 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.

The function of your furnace limit switch is to tell the fan when to turn off and on depending on the temperature in the home. A fan limit switch consists of the following components. The oil fired furnace fan limit switch shown in our photo below is in use on an oil fired warm air furnace where we can see about 3 4 of the silver colored dial where the fan limit switch settings are made red arrow. A limit switch also acts as.

Most types of residential furnaces feature an internal component known as a blower switch that is used to shut down the fan motor in the event that the appliance overheats the motor malfunctions or the furnace filter becomes clogged. Fan and limit control 8 limit control 14 multiple appliance interlock control 2 plenum thermostat 10 snap disc control 51 temperature transducer 3 thermostat 2 universal interlock control 1 warm air limit control 1 view all. A limit switch is a device that s located under your furnace s supply plenum. The fan limit switch also has two other functions.

It s possible to reset the switch at home when necessary by following a few simple steps. It also determines if the furnace should be shut down in the case of overheating. How a fan limit switch works.