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    mikestice's Avatar
    mikestice Posts: 3, Reputation: 1
    New Member
    		  
    #1

    Feb 11, 2010, 04:32 PM
    Intertherm furnaces
    My motor on this intertherm circa 1988 vintage, runs slow. I just replaced it. Before I replaced it the motor never started. I could spin it and maybe it might start. Now I have what I consider to be the original problem back... what might be causing this. I have voltage at my burnbox sensors and when the limit trips the motor begins to spin. However, it spins like it is running only on 110, and not 220 VAC.

    What could be going on here? Thank you in advance...
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Feb 11, 2010, 06:56 PM
    Did you replace the old motor capacitor with a new one sized for the new motor.
    johnair77's Avatar
    johnair77 Posts: 59, Reputation: 1
    Junior Member
    		  
    #3

    Feb 11, 2010, 08:27 PM

    Check voltage going to the mtr. is it 120volts?
    mikestice's Avatar
    mikestice Posts: 3, Reputation: 1
    New Member
    		  
    #4

    Feb 12, 2010, 08:54 AM
    I have 120 at the motor, yes I change the run cap... found a bad ground connection which when tightened produced the desired heating effects through fan motion. Thank you... sometimes a person just needs to be patient when changing large components out...

    Michael.
    mikestice's Avatar
    mikestice Posts: 3, Reputation: 1
    New Member
    		  
    #5

    Feb 12, 2010, 08:56 AM

    I believe 32 years is a good age for a motor to die, what do you think?
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
    Ultra Member
    		  
    #6

    Feb 12, 2010, 09:26 AM
    Quote Originally Posted by mikestice View Post
    I believe 32 years is a good age for a motor to die, what do you think?
    Nah, they should last FO-EV-AH! :D Most furnaces don't last that long.
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