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Old 10-18-2010, 07:31 PM   #1
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Furnace capacitor replacement NT 32A

Wire broke on positive side of furnace capacitor at base. No way to solder wire on it without damage. Called and went to numerous places with no good news so far.

Has anyone found a replacement capacitor for Suburban NT32 on a 72 overlander ?

Marking on the capacitor show :
"Callins"
7136
11-65psd750-50s
750mF-50v

Need furnace for the winter.

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Old 10-18-2010, 09:41 PM   #2
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CORNELL DUBILIER|CG801U050R2C|CAPACITOR ALUM ELECT 800UF, 50V | Newark.com

Check the dimensions and be sure it will fit, the size and shape may differ a little. That one has screw terminals for ease of installation. They have 31 in stock and ship the same day you call. It's a $17 part.

Any of the other large electronics distributors should have them, too.
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Old 10-18-2010, 09:48 PM   #3
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Try this

Quote:
Originally Posted by Bambi517 View Post
Wire broke on positive side of furnace capacitor at base. No way to solder wire on it without damage. Called and went to numerous places with no good news so far.

Has anyone found a replacement capacitor for Suburban NT32 on a 72 overlander ?

Marking on the capacitor show :
"Callins"
7136
11-65psd750-50s
750mF-50v

Need furnace for the winter.

I can not find a capacitor on any Suburban schematic I have found. If the cap is wired across the motor it is a bypass capacitor and it is used for filtering noise, keeping it from the DC supply. Keeps the radio static free when the fan starts.
Never seen a DC starting cap but if you need one this should work just fine, if the size is ok.
Aluminum Electrolytic Capacitors - Screw Terminal
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Old 10-18-2010, 10:02 PM   #4
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I just looked at the 75 service manual and I do not see a cap in the NT 32 circuit or any other furnace circuits that year.
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Old 10-18-2010, 10:19 PM   #5
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an old post from Chuck, here - http://www.airforums.com/forums/f427...tml#post180676

has a Suburban manual posted (for perhaps a product similar to your NT-32A) that describes item # 29A, p/n 230327, as a "Capacitor, 750MFD Electrolytic" on pages 22 & 16.

(the scanned doc has pages 2 to 24 scanned in reverse order! but they're all there!)

I'd try a Suburban dealer / service center first - Airxcel | Suburban Manufacturing Service


failing that, I'd agree with Janet's Husband, Gary, that it's just a filter cap that you should be able to get from a motor or generator shop, or Grainger, or Mouser, etc.

good luck!
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Old 10-18-2010, 10:31 PM   #6
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Interesting that Airstream did not include the cap in their documentation...
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Old 10-19-2010, 12:18 AM   #7
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It's on the schematic linked from post #5 above and is wired as a bypass cap for the fan motor.

Its purpose then would be to reduce the interference to radio systems, particularly broadcast a.m. radio. You can leave it out of the circuit entirely, or replace it with a capacitor of even roughly similar rating. In fact, a 750 uF capacitor is extremely large for that purpose and probably unnecessary. Also, you can use a lower voltage rating, down to 18 volts, and save some space and money. A 470 uF, 18 volt capacitor is small and should be more than sufficient.
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Old 10-19-2010, 01:25 PM   #8
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Love you !

Is it possibly a run capacitor ?

Will definitely try replacing capacitor as I've been told I would need to replace whole furnace!

Thanks again and will let you know how it works out.
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Old 10-19-2010, 01:50 PM   #9
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Question

anything is possible....

icocbw, but I'm thinking that it's not a run capacitor.

if its a filter cap and not a run cap, the furnace blower should work with the cap disconnected. does it?


when you pulled the cover, is there a schematic drawing on the inside or outside the furnace cabinet?

or, how about a picture or two showing the capacitor and what & where it is connected to?

those hints could be telling, since none of us out here can see what you can see there.


best,
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Old 11-03-2010, 12:09 PM   #10
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Furnace Capacitor for NT 32A Suburban furnace/ UPDATE

Thanks to all your input !

I found an exact match (750uf 50v) for the furnace capacitor at Apex Electronics. It was also 50 cents. I was priced $12 to $126 for others that were not Axial or the right microfarad..etc .Received it Monday, but have the belly skin and gas lines disconnected to clean rust off the frame. Luckily just surface rust. Any body used "Ospho" rust remover before ?

Really nice lady at local Hvac company told me about Apex. There is a minimum $10 purchase, but they also sell 30A plugs for my electrical cord. That was $10. Will let you know about the furnace when I have the gas lines hooked up.

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