Furnace Blower Motor Capacitor Wiring

The capacitor will still hold a charge even without power.

Furnace blower motor capacitor wiring.

If an hvac fan motor capacitor just has 2 terminalson its top they will be f fan and c common. Remove any bolt holding the old capacitor in place. Power on and test the system. However some people still struggle with the wiring part of the motor to the capacitor.

What are start run capacitors. 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. Start by carefully inserting the new capacitor into place beside the blower motor.

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. Can a furnace capacitor be tested. Turn off all power to the furnace. Constant voltage for the blower motor is maintained via a capacitor supplying voltage across its secondary winding.

To do this hvac units use what are called start and run capacitors. The blower motor capacitor mounts to the outside of the blower s housing. Video demonstrating the standard wiring for the primary blower motor found in most furnaces and air handlers in residential hvac. Hvac capacitor wiring number of terminals wiring color codes terminal identification codes.

Installing a furnace blower motor capacitor is basically the reverse of removing the original one. 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. 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.

Hope this helps a few folks. Remove the blower housing inside the furnace to access the capacitor. Take pictures of the wiring to reference back if needed. 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.

Insert and bolt in new capacitor. How to wire a furnace or ac blower motor. A start capacitor holds an extra charge to start a motor moving. Yes testing capacitors are a part of heating and cooling troubleshooting and is done all the time.