Furnace Blower Motor Capacitor Wiring

To do this hvac units use what are called start and run capacitors.

Furnace blower motor capacitor wiring. Turn off all power to the furnace. 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. Insert and bolt in new capacitor. Hvac capacitor wiring number of terminals wiring color codes terminal identification codes.

Set a voltmeter to the x1 setting. Start by carefully inserting the new capacitor into place beside the blower motor. Hope this helps a few folks. Shut off the power to the furnace at the fuse.

Locate the capacitor usual close to the furnace motor. Remove the blower housing inside the furnace to access the capacitor. 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.

Remove the wires from the terminal and discharge the capacitor using the instructions included with your furnace. Video demonstrating the standard wiring for the primary blower motor found in most furnaces and air handlers in residential hvac. How to wire a furnace or ac blower motor. 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.

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. The capacitor will still hold a charge even without power. 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. The blower motor capacitor mounts to the outside of the blower s housing.

This video shows how to wire a furnace blower motor to an extension cord how to reverse the rotation what informa. A start capacitor holds an extra charge to start a motor moving. Constant voltage for the blower motor is maintained via a capacitor supplying voltage across its secondary winding. Remove any bolt holding the old capacitor in place.

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. However some people still struggle with the wiring part of the motor to the capacitor. Power on and test the system. Installing a furnace blower motor capacitor is basically the reverse of removing the original one.