Anatomy Of A Blower Motor: Replacement

©MagicPatrick1

Category:

Howto & Style

Tags:

• Bower Motor
• Replacement
• Furnace
• Williamson
• Temp-O-matic
• Bard
• Lennox
• Trane
• Sears
• Whirlpool
• Philco
• Intertherm
• Gibson
• Kelvinator
• Maytag
• Hot
• Air
• Bryant
• Carrier
• Payne
• Conquest80
• freedom90

[dstoltz100]

Does the wheel need to be balanced after install? Also, I have a 3 speed motor - should I run it at medium or high?

[MagicPatrick1]

@dstoltz100 No the wheel shouldn't need balanced. If it's bent however it will rattle like mad. For hot air/heat, medium should be fine.

[heavydiesel]

@VonDuross You can also get plastic cased run capacitors, most of the european stuff i work on like fan motors and pumps has plastic run caps, though metal cased ones are common on compressors.

[VonDuross]

note about capacitors, metal ones are run capacitors, plastic ones are start capacitors. you may use a run to replace a start, but not vice versa. also, make sure the one you get has the correct mF and voltage ratings.

[sonofabippi]

much much thanks for putting this together. I always like to catch something like this on youtube before I attempt an undertaking, 9 times out of 10 there's something I didn't think about, or something where I grossly underestimated some complications and should just call someone. I really appreciate this.

[docmarc36]

WEASEL PISS!!!

LOL

[MagicPatrick1]

@MagicPatrick1 If all this seems highly technical, and or don't undertand it. PLEASE DONT TRY IT.

If you do have a vast knowledge of electricity and wiring, you could bypass the board all together with a simple relay. So that if W (Heat) calls, it will power the fan with no delay. Placing a jumper between W and G wont work, because if your ac calls, the heat will come on. Or if someone turns the fan into the on position at the tsat. Assuming, you have ac, and that type of setup.

[MagicPatrick1]

@MagicPatrick1 If you find these terminals, simply switch the heat/cool or heat, with a parked one. If you switch heat cool, beware your ac won't perform well and potentially ice up. But atleast you'll know it's the motor and not the board. If you switch these speeds and it does it again and you verify the loss of poer to the motor with a meter, you have a bad board. The internal fan relay on the heat side is bad., leaving R & G jumpered will get you through until you get a new one.

[MagicPatrick1]

@MagicPatrick1 On the board will be terminals that the blower wires go to. Heat, cool, and park or stop. The park is designated for unused speeds. These maybe medium high, or medium low. All of this is presuming you don't have a variable speed motor. If it is, you'll need to call a reputable repair person who has the correct test equipment. For example Carrier has a module that plugs into the Motor control for diagnosis.

[MagicPatrick1]

@MagicPatrick1 By putting the jumper from R to G will possibly make the motor run in high speed. If it never shuts off prematurely, you could try either switching the speeds or replace the board or relay, whichever you have. This would depend on the outcome of the test. You'll need to read the scematic and identify the speeds noted by color. Red, black, or blue, white is normally common. Make sure you mark them down on paper incase it doesn't work.