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Replacing a Blower Motor for an HVAC System

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

Home Electrical Wiring Video

How to Wire a GFCI Outlet
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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: Intermediate to Advanced – Best wired by a Licensed Electrical Contractor, or by a Licensed HVAC Furnace Contractor.
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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Electrical Wiring

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You identified your project to be about 220 Volt Wiring Diagram, so you might find this information useful:

220 Volt Wiring Diagram
220 Volt Wiring Diagram

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Dave's Guide to Home Electrical Wiring:

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Here's How to Do It:
Wire It Right with the help of my Illustrated Wiring Book

Great for any Home Wiring Project.
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Complete Guide to Home Electrical Wiring

Perfect for Homeowners, Students,
Handyman, Handy Women, and Electricians
Wiring GFCI Outlets
Wiring Home Electric Circuits
120 Volt and 240 Volt Outlet Circuits
Wiring Light Switches
Wiring 3-Wire and 4-Wire Electric Range
Wiring 3-Wire and 4-Wire Dryer Cord and Dryer Outlet
How to Troubleshoot and Repair Electrical Wiring
Wiring Methods for Upgrading Electrical Wiring
NEC Codes for Home Electrical Wiring
....and much more.

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Be Careful and Be Safe - Never Work on Energized Circuits!
Consult your Local Building Department about Permits and Inspections for all Electric Wiring Projects.

Electrical Tips to Help You Wire it Right

The Safest Way to Test Electrical Devices and Identify Electric Wires!

The Non-Contact Electrical Tester
This is a testing tool that I have had in my personal electrical tool pouch for years, and is the first test tool I grab to help identify electrical wiring. It is a Non-contact tester that I use to easily Detect Voltage in Cables, Cords, Circuit Breakers, Lighting Fixtures, Switches, Outlets and Wires. Simply insert the end of the tester into an outlet, lamp socket, or hold the end of the tester against the wire you wish to test. Very handy and easy to use.

The Quickest Way to Check for Faulty Electrical Wiring!

The Plug-In Outlet Tester
This is the first tool I grab to troubleshoot a problem with outlet circuit wiring. This popular tester is also used by most inspectors to test for power and check the polarity of circuit wiring.
It detects probable improper wiring conditions in standard 110-125 VAC outlets Provides 6 probable wiring conditions that are quick and easy to read for ultimate efficiency Lights indicate if wiring is correct and indicator light chart is included Tests standard 3-wire outlets UL Listed Light indicates if wiring is incorrect Very handy and easy to use.

Strip Off Wire Insulation without Nicking and Damaging the Electric Wire!

The Wire Stripper and Wire Cutter
My absolute favorite wire stripping tool that I have had in my personal electrical tool pouch for years, and this is the tool I use to safely strip electrical wires.
This handy tool has multiple uses:
The wire gauges are shown on the side of the tool so you know which slot to use for stripping insulation.
The end of the tool can be used to grip and bend wire which is handy for attaching wire onto the screw terminals of switches and outlets..

The wire stripper will work on both solid and stranded wire. This tool is Very Handy and Easy to Use.

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FAQs Frequently Asked Questions and Comments

2 Responses to “Replacing a Blower Motor for an HVAC System”
  1. 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.

  2. 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.