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Replacing a Blower Motor for an HVAC System

By Dave Rongey - Summary:

How can I Adjust The Speed on an HVAC Blower Motor? Speed variations and wiring configurations of a Blower Motor.

Wiring Options when Replacing a Blower Motor

Electrical Question: How can I adjust the speed on an HVAC blower motor?

This HVAC Question came from: Kevin, a Handyman from Sacramento, California.
Additional Comments: Awesome! But need to add an article on changeover switches.

Dave’s Reply:
Thanks for your HVAC Question Kevin.

How to Control the Blower Motor Speed on a HVAC Blower Motor

Application: Replacing a Blower Motor – HVAC Heating Ventilation and Air Conditioning
Skill Level: Beginner to Intermediate – Best performed by a trained HVAC Service Technician..
Tools Required: Basic Electricians Pouch Hand Tools and Voltage Tester.
Estimated Time: Depends on personal level experience and ability to work with tools.
Precaution: Identify the furnace circuit at the electrical panel, turn it OFF and  Tag it with a Note before working with the blower motor wiring. record the wiring connections before removing any spliced wiring connections.
Wiring Connections and Settings: The replacement blower motor should have the same specifications as the original motor. The wiring connections should be made for the suggested blower speed as recommended by the furnace manufacturer

Furnace Blowers for HVAC, Heating Ventilation and Air Conditioning with a Universal Cam Changeover Switch to Reduce Motor Speed

When Replacing a Blower Motor only install HVAC controls options or methods that are only approved for the specific unit that you have.

HVAC Blower Motor Speed Adjustment

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2 Responses to “Replacing a Blower Motor for an HVAC System”
  1. Dave Rongey says:

    Hi John,
    When something like this happens where the motor fails there are two things I would check. First, check the voltage of the motor to make sure it is the same voltage as the outlet that will be supplying the power. Next, I would make sure the power of the outlet is correct and compatible with the motor voltage. If there were sparks when you plugged the motor in then I would also double check to make sure that the wiring is not damaged and the connections inside the motor are correct.

  2. john yohn says:

    I bought a new electric blower motor for a wood burning furnace. I wired it to an existing outlet. The black wire to black wire, and the white wire to the white wire. When I plugged it in sparks come from the motor and I can smell wire burning. I unplugged it right away, but is the motor bad or my wiring.