Keep burning up blower motors.


  #1  
Old 04-24-13, 10:28 AM
J
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Keep burning up blower motors.

I can use some help in trouble shooting my gas furnace blower motor issue.

The components are

Emerson 5460 motor
Honeywell fan controller
Trane RLY01014 relay

New capacitor with every motor change. They last anywhere from 8 weeks-a year and a half.

I noticed the wire running into the "Fan Line" terminal of the fan controller has become very hot and scorched the area around it. I removed it and made a clean connection. It still has this problem.

It seems that usually problems occur when switching between heat, Off, and AC inside on the thermostat. Is the relay, or the switch attached to it not functioning correctly and sending too much power?
 

Last edited by jimshine; 04-24-13 at 11:11 AM.
  #2  
Old 04-24-13, 12:25 PM
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have you taken an amp draw? Amp draw while bypassing the relay and controller? Are you using the correct motor for replacement? What is the model number of the furnace/air handler the motor is in?
 
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Old 04-25-13, 11:32 AM
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It is a GE BLD080E 936B1.

I have not bipassed for a reading. Should I take the reading from the Line In?

I have no idea if this is indeed the correct motor 100%. Years ago I had it replaced by a technician. The warranty was out when it died. I have been using the exact same make and model motor he used.
 
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Old 04-25-13, 03:43 PM
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Here is what I came back with from Trane:

Part Item Number MOT02883
Description MOTOR; 1/3HP, 115/60/1, 1075 RPM, OPEN, 48 FRAME, 5 SPEED 4 MFD AT 370V

That is a very old furnace with a standing pilot.... It is time to consider your replacement options instead of continuing to repair.
 
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Old 04-26-13, 01:42 AM
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Using a smaller motor (hp) than what the blower wheel was designed for at a given rpm can cause premature failure.

Energizing more the one tap simultaneously can cause burnout.

Using the wrong capacitor, im sure - can wreck a motor over time.
 
 

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