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Draft Inducer Motor Replacement

Draft Inducer Motor Replacement

Craig Lloyd

Craig Lloyd

Última atualização em January 21, 2022

30 minutos - 1 hora
Moderada

Introdução

Vá para o passo 1

In a gas furnace, the draft inducer is responsible for expelling combustion gas out of the furnace and venting it to the outside. It’s one of the most important components in a furnace, and it’s the first thing that turns on when a heating cycle begins. It also stays running during a heating cycle to provide a steady and even flow of oxygen to the burners.

When a draft inducer motor stops working, the entire gas furnace will cease operation, so it’s important that you replace it as soon as possible. A loud whining noise is characteristic of a failing draft inducer motor, as the bearings inside are wearing out.

This replacement guide uses a Carrier WeatherMaker 8000TS furnace from 1999. The draft inducer motor and assembly may differ on your specific furnace model.

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  1. Draft Inducer Motor Replacement, Draft Inducer Motor: passo 1, imagem 1 %32 Draft Inducer Motor Replacement, Draft Inducer Motor: passo 1, imagem 2 %32

    • Start by turning off the flow of gas to your furnace, as well as cutting power to the whole furnace by flipping the service switch to the "Off" position.

    • If your furnace doesn't have a service switch nearby, you'll need to cut power to it at the breaker box.

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  2. Draft Inducer Motor Replacement: passo 2, imagem 1 %32 Draft Inducer Motor Replacement: passo 2, imagem 2 %32

    • Grab the handle on the front panel marked "Lift" and push up to release the panel. Place it off to the side.

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  3. Draft Inducer Motor Replacement: passo 3, imagem 1 %32 Draft Inducer Motor Replacement: passo 3, imagem 2 %32 Draft Inducer Motor Replacement: passo 3, imagem 3 %32

    • The draft inducer is located in the upper-left area of the furnace chamber.

    • Unplug the motor's Molex connector.

    • Your specific furnace model may use a draft inducer with two small connectors on the motor itself, rather than a single Molex connector.

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  4. Draft Inducer Motor Replacement: passo 4, imagem 1 %32 Draft Inducer Motor Replacement: passo 4, imagem 2 %32

    • Use a flathead screwdriver or a 1/4-inch socket to remove the two screws holding the shield plate to the draft inducer assembly.

    • Remove the plate and set it off to the side.

    • Be sure to keep track of all the screws and bolts!

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  6. Draft Inducer Motor Replacement: passo 5, imagem 1 %32 Draft Inducer Motor Replacement: passo 5, imagem 2 %32 Draft Inducer Motor Replacement: passo 5, imagem 3 %32

    • Use a 1/4-inch socket to remove the three mounting bolts securing the draft inducer assembly to the furnace.

    • Support the motor and assembly from the bottom and slowly remove it from the furnace.

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  7. Draft Inducer Motor Replacement: passo 6, imagem 1 %32 Draft Inducer Motor Replacement: passo 6, imagem 2 %32

    • Use a flathead screwdriver or a small pry tool to carefully pry off the circular clip from the cooling fan.

    • Be careful not to apply a lot of pressure on the fan itself, since it's made of plastic and will break with enough force.

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  8. Draft Inducer Motor Replacement: passo 7, imagem 1 %32 Draft Inducer Motor Replacement: passo 7, imagem 2 %32 Draft Inducer Motor Replacement: passo 7, imagem 3 %32

    • Remove the cooling fan from the motor's driveshaft.

    • You may need to apply a decent amount of pressure and wiggle the fan in order to knock it loose.

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  9. Draft Inducer Motor Replacement: passo 8, imagem 1 %32 Draft Inducer Motor Replacement: passo 8, imagem 2 %32 Draft Inducer Motor Replacement: passo 8, imagem 3 %32

    • Flip the assembly over and use a 1/8-inch hex key to loosen the set screw securing the blower fan to the motor's driveshaft.

    • More than likely, the fan and set screw will be rusted and seized to the driveshaft. A few sprays of penetrating oil will help loosen it up.

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  10. Draft Inducer Motor Replacement: passo 9, imagem 1 %32 Draft Inducer Motor Replacement: passo 9, imagem 2 %32 Draft Inducer Motor Replacement: passo 9, imagem 3 %32

    • Remove the blower fan from the motor's driveshaft.

    • As with the cooling fan, you may need to apply a decent amount of pressure and wiggle the blower fan in order to remove it.

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  11. Draft Inducer Motor Replacement: passo 10, imagem 1 %32 Draft Inducer Motor Replacement: passo 10, imagem 2 %32 Draft Inducer Motor Replacement: passo 10, imagem 3 %32

    • Flip over the assembly and use a 1/4-inch socket to remove the three bolts securing the motor bracket to the motor plate.

    • Once the bolts are removed, flip the assembly back over and remove the motor bracket.

    • Once removed, take note of the motor's ground wire, which connects to one of the bracket bolts. Be sure to reconnect it during reassembly.

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  12. Draft Inducer Motor Replacement: passo 11, imagem 1 %32 Draft Inducer Motor Replacement: passo 11, imagem 2 %32

    • Use a 1/4-inch socket to remove the two bolts securing the motor to the motor plate.

    • Remove the motor bracket.

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  13. Draft Inducer Motor Replacement: passo 12, imagem 1 %32

    • When installing the blower fan onto the new motor, be sure that the set screw on the blower fan lines up with the flat edge of the motor's driveshaft.

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Conclusão

To reassemble your device, follow these instructions in reverse order.

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Autor(a)

Craig Lloyd

Membro desde: 02/10/16

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Autoria de 82 guias

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2 comentários

Thanks for the instructions, very helpful.

Do you know the Inducer motor part number?

Selvan Lingam - Responder

Good morning, I need the whole unit ( motor, fan, blower fan, ) etc. This looks like same same unit I have but I can't find a model number for this to make sure I purchase the right one for my unit. I have a carrier weathermaker 8000vs looks exactly like the one here can someone please provide some helpful information thanks.

Joshua Thomas - Responder

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