replacing a blower motor

SDE · Posted: Tue Sep 25, 2012 2:38 am Post subject: replacing a blower motor

The bad motor had three wires. One grounded the motor to the fan case. The black wire was connected to the black power wire and the white wire from the motor was connected to the temperature senser. I have a blower motor from an old mobile home. It has three wires also. One white, one blue, and one black. All I can do is get it to buzz. The black and the blue wires have female connectors and the white is bare. How do I connect the wires to get it to run? I have a Lennox Pulse furnace in a shed, but it has a about 6 wires attached to it.
Thank you
SDE

Dusty MI · Posted: Tue Sep 25, 2012 3:44 am Post subject: Re: replacing a blower motor

Not sure put the blue wire probably went to a starting capacitor that was near the motor.
Post the information thats on the motor, maybe someone can tell you what capacitor you need.

Dusty

old · Posted: Tue Sep 25, 2012 7:39 am Post subject: Re: replacing a blower motor

As the other guy said sounds like you need a cap in the wiring to give it that little extra kick to get it going. Never seen a fan motor from a mobile home that did not have one on it. Try this and if it works then you need a cap for it. turn it on then try to spin it by hand. If you can get it to spin up that way you need to add a cap to the system

DH in Carolina · Posted: Tue Sep 25, 2012 9:15 am Post subject: Re: replacing a blower motor

What voltage are you working with? If the motor from the old mobile home came from an electric furnace it is probably 240 volts. White wire is common and blue is low speed , black is high speed. You may be using a 230 volt motor on 115 volts. There are plenty of blower motors that don't use a capacitor. The lennox motor is probably 4 speed with a run capacitor. Most of the time: white, yellow or purple are common- red, black, blue are speeds slection and brown is for a capacitor.

SDE · Posted: Tue Sep 25, 2012 6:18 pm Post subject: Re: replacing a blower motor

I almost did as you suggested, and then thought I would rather not get my hand skinned up. Tomorrow I will try to get it to spin. I do not recall seeing any stickers on it to Identify it though. I might stop in town tomorrow and talk to Al, our hardware man. He seems to have done everything at least once.
Thank you all.
Steve

Dusty MI · Posted: Wed Sep 26, 2012 3:49 am Post subject: Re: replacing a blower motor

Give a spin first then turn it on before it stops spinning.

Dusty

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