Gas Furnace Blower Motor Amp Draw

Knowing how to troubleshoot and diagnose problems with these motors is an essential skill an hvac technician must possess.

Gas furnace blower motor amp draw.

The furnace transformer uses very little elctric. If i wait until it turns off and then set the fan to on instead of auto it draws around 9 a. Furnace blower motors and condensing fan motors will have the amps labeled on a name tag on the motor. A gas fired forced air home furnace typically requires a small amount of electricity to ignite and operate in your home.

When i turn the temperature down and it goes back to only running the fan it drops slightly to 4 4 a. So your blower is whats using most of that amp draw. Now i am not quite sure how this works out. While checking the unit today i noticed the motor that was replaced two years ago was drawing 7 7 with a fla of 7 5 the service factor on the motor is 1 0.

It s one of the lesser used diagnostic tests but perhaps if we focus on how to measure amp draw and learn to better interpret what it can tell us we will expand our ability to provide comfort to those we serve. Undersized ducts can cause that with vs blowers. When the furnace starts up fully including gas firing it is drawing about 5 2 a. I know that this is barely over fla but i normally see these 1 2 hp motors drawing 4 5 amps at maximum.

Furthermore how much electricity does a furnace use. Blower motor breakdown can be the result of anything from old age to failed bearings high amp draw electrical failure in the windings dirt accumulation and more. Most gas heat furnaces use less than 600 watts of electricity or less than half of a typical 15 amp electric circuit. A condensing fan motor 230 volts 1 9 amps amperage is a measure of power being consumed by electrical device.

It can be simply labeled amp or in some cases fla full load amps which is the max the motor is rated to run at. Amp draw is a measurement of the power being consumed by a blower motor to move the air through your hvac system.