tlen234
Kitsap County, WA
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Joined: 04/21/2004
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I'm trying to troubleshoot a Coleman Mach 3 PS #8633B876 AC and need some help. When I turn the switch to low fan I get a hum and the fan doesn't come on. Further turning the switch [momentarily] to high fan, low cools and high cool gives the same hum.
I removed the [inside] filter grille and found the fan turns freely. When I spin the fan and then quickly turn the selector switch to low fan the hum goes away and the fan comes up to speed. When I turn the switch further everything works as usual.
What appears to be my problem and what else should I do and/or replace ?
Oh, I've removed the 4 hold down screws on the roof top shroud/cover but it won't come off. Is there a trick getting the roof top shroud/cover off ? Something else appears to be holding the cover in-place. Coleman documentation is worthless.
* This post was
edited 09/01/08 12:34pm by tlen234 *
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Mooney
Santa Barbara, Ca
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This just doesn't sound like an easy answer. Have you already tried to call the Coleman tech line?
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Stim
NE Florida
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Joined: 05/23/2007
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There should be a start capacitor for the fan motor. I'm guessing it's bad. They fail often enough and are not that expensive. If you can read the numbers on it you can buy a generic one from Grainger or an electric motor repair shop.
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dougrainer
Carrolton
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You have a bad Fan start Capacitor. Common problem on RVP products. To remove the top shroud after the 4 screws are removed, "pop" it forward and the angle clips will release it. Doug
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tlen234
Kitsap County, WA
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Joined: 04/21/2004
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Finally, I got the shroud removed and the fan capacitor out. [An open circuit indicates it is shot.] Coleman's parts list simply states "Fan Capacitor [7.5 Mfd/370V]". I've looked up Grainger on-line and to confuse the issue there are both "start" and "run" capacitors listed and the only 7.5 Mfd/370V capacitor is listed as a "run" capacitor. What's the difference between a "start" and "run" capacitor and for my application does it matter ? I thought a capacitor was just a capacitor... Thanks again.
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Mooney
Santa Barbara, Ca
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If you get the number please post back, sounds like a good part to stock for those of us who have the Mach III PS.
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Latner
Indiana
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Joined: 08/06/2006
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There is a difference between "run" and "start". Common applications for the start capacitor are generally limited to compressors and only to start the compressor. Typically, when a start capacitor is used, a special relay accompanies it in the circuit to disengage the start capacitor after the compressor motor gets it's initial boost in torque from the start capacitor.
The run capacitor is usually used for single-phase motors (blower/fan motors).
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tlen234
Kitsap County, WA
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Mooney wrote:If you get the number please post back, sounds like a good part to stock for those of us who have the Mach III PS.
The fan capacitor is a AEROVOX/SUPERNOL M22P3707N00, 7.5 mfd, 1.5" OD X 2.62" long.
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tlen234
Kitsap County, WA
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Yup, it was the fan capacitor. Installed a new one, part #1499-5461, and the AC now works fine. Thanks guys.......
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