Furnace Blower Motor Capacitor Wiring

Yes testing capacitors are a part of heating and cooling troubleshooting and is done all the time.

Furnace blower motor capacitor wiring. Hope this helps a few folks. Reattach wires as you have them marked it should not be difficult to relate the new capacitor to the old one and know which wires go where. Video demonstrating the standard wiring for the primary blower motor found in most furnaces and air handlers in residential hvac. The blower motor capacitor mounts to the outside of the blower s housing.

Hvac capacitor wiring number of terminals wiring color codes terminal identification codes. Power on and test the system. Shut off the power to the furnace at the fuse. Set a voltmeter to the x1 setting.

What are start run capacitors. Can a furnace capacitor be tested. Remove the blower housing inside the furnace to access the capacitor. How to wire a run capacitor to a motor blowers condensers sometimes when a blower or condenser fan motor goes bad a technician or even a diyer has issues wiring the new motor and capacitor most motors come with clear instructions or a wiring diagram on the side.

To do this hvac units use what are called start and run capacitors. Turn off all power to the furnace. The capacitor will still hold a charge even without power. Motors used in hvac such as the condensing fan motors or blower fan motors sometimes need help to start moving and to stay running at a steady pace with no heavy up and down spikes.

Take pictures of the wiring to reference back if needed. However some people still struggle with the wiring part of the motor to the capacitor. A start capacitor holds an extra charge to start a motor moving. Start by carefully inserting the new capacitor into place beside the blower motor.

If an hvac fan motor capacitor just has 2 terminalson its top they will be f fan and c common. Installing a furnace blower motor capacitor is basically the reverse of removing the original one. Remove any bolt holding the old capacitor in place. How to wire a furnace or ac blower motor.

Remove the wires from the terminal and discharge the capacitor using the instructions included with your furnace. The speed wires connected to the blower motor are connected to a fan relay which uses a low voltage signal to activate a high voltage switch. If an hvac motor capacitor has 3 terminals they will be marked f fan h herm compressor c com connects to the contactor to provide power to the. Locate the capacitor usual close to the furnace motor.