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Old 12-19-2010, 11:14 AM   #1
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Ge blower motor in carrier seizes when power applied


I have a rooftop carrier unit the blower motor is 3 phase spins free when off ...power on and seizes up trying to start could it be the cap how do you test?

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Old 12-19-2010, 12:56 PM   #2
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Ge blower motor in carrier seizes when power applied


Three phase is not something a DIY should mess with. It's many times more dangerous then household voltage'


THE FACT YOU ASKED IF IT HAS A CAPACITOR SHOWS YOU LACK THE PROPER UNDERSTANDING TO GO FORWARD WITH THIS REPAIR.

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Old 12-20-2010, 01:28 AM   #3
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Ge blower motor in carrier seizes when power applied


i asked how do you test a cap on a 3 phase? but thanks for your intelligent response... can't read huh?
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Old 12-20-2010, 01:31 AM   #4
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Ge blower motor in carrier seizes when power applied


you don't have a cap on a 3 phase motor. That's the beauty of 3 phase. You don't need to artificially shift the sine wave to create an offset wave.
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Old 12-20-2010, 01:40 AM   #5
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Ge blower motor in carrier seizes when power applied


thats where my confusion is it says 208/240 2o8/400 3 phase and there is a cap
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Old 12-20-2010, 02:20 AM   #6
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Ge blower motor in carrier seizes when power applied


I'm confused as well.

To test a cap, I grab my trust cap tester and hook it up. There are methods to check the general condition of a cap without one, an actual cap tester is the only way to determine if the cap's capacity is proper.
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Old 12-20-2010, 02:53 AM   #7
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Ge blower motor in carrier seizes when power applied


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Originally Posted by kenfranciose View Post
i asked how do you test a cap on a 3 phase? but thanks for your intelligent response... can't read huh?
Please don't mouth me...I know how to repair 3 phase and I know how to check a cap.

That's why you are looking for advice and I am here giving it to folks who ask.
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Old 12-20-2010, 08:23 AM   #8
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Ge blower motor in carrier seizes when power applied


Doesn't "208/240 2o8/400 3 phase " mean it works on 240 2 phase and 400 3 phase if wired correctly? Are you sure its wired as a 3 phase? if there is a cap its wired as a 2 phase
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Old 12-20-2010, 04:40 PM   #9
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Ge blower motor in carrier seizes when power applied


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Doesn't "208/240 2o8/400 3 phase " mean it works on 240 2 phase and 400 3 phase if wired correctly? Are you sure its wired as a 3 phase? if there is a cap its wired as a 2 phase
there is no 2 phase in use in the US that I am aware of. I suppose there might be some special use stuff somewhere but (and the generating plant at Niagra Falls even used to be) but I do not believe there is anymore in general use.

You have single or 3 phase.
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Old 12-20-2010, 04:41 PM   #10
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Ge blower motor in carrier seizes when power applied


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there is no 2 phase in use in the US that I am aware of. I suppose there might be some special use stuff somewhere but (and the generating plant at Niagra Falls even used to be) but I do not believe there is anymore in general use.

You have single or 3 phase.

sorry, I mean single don't know why I wrote two was thinking hot wires not phases
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Old 12-20-2010, 04:43 PM   #11
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Ge blower motor in carrier seizes when power applied


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sorry, I mean single don't know why I wrote two was thinking hot wires not phases
a lot of people do the same thing when using 2 legs of a power supply. You aren't the only one that does it.
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Old 12-20-2010, 04:47 PM   #12
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Ge blower motor in carrier seizes when power applied


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a lot of people do the same thing when using 2 legs of a power supply. You aren't the only one that does it.
I think the thing that trips me up is my service panel calls it "Phase A" and "Phase B" which makes you think in your head its two phase when its really leg 1 +120v leg 2 +120v
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Old 12-20-2010, 08:54 PM   #13
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Ge blower motor in carrier seizes when power applied


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I think the thing that trips me up is my service panel calls it "Phase A" and "Phase B" which makes you think in your head its two phase when its really leg 1 +120v leg 2 +120v
Also know as split phase. And sometimes poly phase.
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Old 12-20-2010, 08:56 PM   #14
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Ge blower motor in carrier seizes when power applied


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Originally Posted by kenfranciose View Post
I have a rooftop carrier unit the blower motor is 3 phase spins free when off ...power on and seizes up trying to start could it be the cap how do you test?
Motor run capacitors are cheap. Go out and buy a new one. Install it, and see if the motor runs.

The other way to test it. is to use a capacitor tester.
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Old 12-20-2010, 09:46 PM   #15
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Ge blower motor in carrier seizes when power applied


Forgot about poly phase. My bad.


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