Have two capacitors called a start and run capacitor.
Furnace blower motor capacitor polarity.
This is the most common design type.
Your furnace uses a lot of energy so to supply the extra energy needed to power the blower gas furnaces have a capacitor.
When the run capacitor on a permanent split capacitor motor for a furnace is not working the blower fan will not operate.
Its capacitor works like a battery and stores the energy needed by the blower to work properly.
Without the capacitor the blower would not start because the run capacitor initiates the blower fan to start turning.
The capacitor feeds the motor extra power until the fan starts moving at a predetermined speed at which point the capacitor turns off.
The blower then moves the warmed air into and through the ductwork in your house.
A start or run capacitor can be combined into one capacitor called a dual capacitor with three leads but can be split between two separate capacitors.
To answer this question the panel door to the furnace will need to be removed.
Diagnosing a problem with a blower s capacitor requires an understanding of the capacitor s function.
Where is a furnace capacitor located.
The blower motor in your furnace blows hot air through the ducts and into your home.
Some units do not use a capacitors to run the blower motor.
If not the capacitor or the blower motor is not functioning properly.
While the run capacitor stays on giving the motor extra torque when needed.
The start capacitor gives a fan motor the torque it needs to start spinning then stops.
Like a battery the capacitor stores the extra energy that is needed to jump start the furnace blower.
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A bad or faulty capacitor can exhibit many signs and symptoms.
But with a bad capacitor your blower cannot function well and may put your family s comfort at risk.
Follow these instructions to install a furnace blower motor capacitor.
It will switch back into circuit once the furnace blower motor drops below the predetermined speed.
How to check a run capacitor.
Problem indicators what you can do.
Before checking the capacitor make sure the fuse controlling the furnace is flipped to the on position.
