Furnace Blower Motor Capacitor Wiring

Turn off all power to the furnace.

Furnace blower motor capacitor wiring.

Set a voltmeter to the x1 setting. Constant voltage for the blower motor is maintained via a capacitor supplying voltage across its secondary winding. 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. This video shows how to wire a furnace blower motor to an extension cord how to reverse the rotation what informa.

Insert and bolt in new capacitor. 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. What are start run capacitors. Power on and test the system.

Take pictures of the wiring to reference back if needed. Yes testing capacitors are a part of heating and cooling troubleshooting and is done all the time. Hvac capacitor wiring number of terminals wiring color codes terminal identification codes. Remove any bolt holding the old capacitor in place.

How to wire a furnace or ac blower motor. A start capacitor holds an extra charge to start a motor moving. Video demonstrating the standard wiring for the primary blower motor found in most furnaces and air handlers in residential hvac. Can a furnace capacitor be tested.

The blower motor capacitor mounts to the outside of the blower s housing. 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. 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.

The capacitor will still hold a charge even without power. Remove the blower housing inside the furnace to access the capacitor. Locate the capacitor usual close to the furnace motor. 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.

However some people still struggle with the wiring part of the motor to the capacitor. Hope this helps a few folks. Installing a furnace blower motor capacitor is basically the reverse of removing the original one. Shut off the power to the furnace at the fuse.