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08-23-2009, 10:21 PM
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#1
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Member
Join Date: Aug 2008
Location: Ohio
Posts: 78
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What exactly is the fuction of the capacitor in the AC circuitry? Our front unit will not kick in the compressor, stays in FAN operation after COOL has been selected. Rear unit works fine. We do not attempt to run both at one time. (30amp service/5.5k Generator) I thought that I had read a post somewhere about this problem being traced to the capacitor.
TIA
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Carl and Valarie * 1997 National RV Dolphin 535,
2003 Jeep Wrangler, 944 Porsche NASA-GTS/2,
Yamaha CT175/Honda Spree, 24ft Vintage Trailer
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08-24-2009, 04:01 AM
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#2
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Community Moderator
Gulf Streamers Club Country Coach Owners Club Appalachian Campers
Join Date: Mar 2000
Location: Chattanooga, Tn.
Posts: 7,952
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Your scenario could be a bad capacitor but not always. The function of a capacitor in this case is to shift the phase in an induction load. If you were to look at a sine wave of a alternating current and put a capacitor on the same source, leaving the original in place, you would see a sine wave overlapping the original but out of phase. This is what helps a split phase motor start easier, requiring less hp to move the load.
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Mike, Certified Master RV Technician
Amy, RV Merchandiser; Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser & 2 toads
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AC Capacitor Question
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08-24-2009, 05:58 AM
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#3
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Senior Member
Fleetwood Owners Club
Join Date: Jul 2007
Location: Northwest Indiana
Posts: 174
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What brand is the Air Conditioner?
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96 Pace Arrow Vision 35 W/09 Jeep Liberty Sport 4X4
Some posts have up to 5 lines in what I presume is the signature area. But I can only fit 3 lines in. 
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08-25-2009, 06:09 PM
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#4
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Member
Join Date: Aug 2008
Location: Ohio
Posts: 78
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Was away...
They are Dometic 57915-622
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Carl and Valarie * 1997 National RV Dolphin 535,
2003 Jeep Wrangler, 944 Porsche NASA-GTS/2,
Yamaha CT175/Honda Spree, 24ft Vintage Trailer
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08-25-2009, 06:11 PM
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#5
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Member
Join Date: Aug 2008
Location: Ohio
Posts: 78
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RV Wizard/Mike,
Care to offer any other possibilities?
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Carl and Valarie * 1997 National RV Dolphin 535,
2003 Jeep Wrangler, 944 Porsche NASA-GTS/2,
Yamaha CT175/Honda Spree, 24ft Vintage Trailer
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08-25-2009, 06:20 PM
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#6
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Moderator Emeritus
Monaco Owners Club Excel Owners Club
Join Date: Nov 2006
Location: Hangin' with Sacs and the Pins
Posts: 9,393
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MM
*MonacoMama with the 2 Pins & SacsTC Nearby* *2007 Monaco Diplomat 40' SFT<>2006 Chevy VortecMax Toad<>2006 Buick Lucerne Leading the Way*
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08-26-2009, 04:25 AM
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#7
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Community Moderator
Gulf Streamers Club Country Coach Owners Club Appalachian Campers
Join Date: Mar 2000
Location: Chattanooga, Tn.
Posts: 7,952
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You will need t troubleshoot the entire system to find the problem. Does the T'stat send power to the unit on the compressor control circuit? Does the relay on the control board for the compressor close? Is the compressor terminals getting power?
Let us know what you find.
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Mike, Certified Master RV Technician
Amy, RV Merchandiser; Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser & 2 toads
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08-30-2009, 01:17 PM
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#8
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Senior Member
Join Date: Oct 2002
Location: Outdoor Resorts, Port St. Lucie FL
Posts: 680
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When my Dometic A/C did what yours is doing, I went up on the roof and pulled the cover, finding a lot of BLACK! Pretty easy to see the burnt wiring at the capacitor and I knew right away what I needed. You can get a new capacitor from a lot of places, but I found the best price at WWGrainger, believe it or not. About $14 as I remember. I bought three spares and sure enough, a second unit went out...now all I need to do is wait for that third one to go and they'll all be replaced with the new model capacitor.
BTW....Dometic admitted to using a poor quality capacitor in their models during the 2006 timeframe. Mine was built in 2006 and yours may have been also. So this is a known and well-documented problem
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Bob and Carol
2007 Travel Supreme Alante 45MS14
2006 Lexus LX470 Toad
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08-30-2009, 02:19 PM
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#9
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Senior Member
Join Date: May 2004
Location: Auburn, CA, Havasu, AZ & Mulege, BCS
Posts: 3,467
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Bob (I assume that wasn't Carol, bad me, sorry Carol)-
do you have a part number for that capacitor so I can order spares?
Mike
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Baja-tested '08 2-slide 36'
Alpine: The Ultimate DIY'er Project
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08-30-2009, 04:46 PM
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#10
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Senior Member
Join Date: Oct 2002
Location: Outdoor Resorts, Port St. Lucie FL
Posts: 680
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Yeah, it's a Supco SPP5 model. Grainger's # is 4E239 These are available at various places on the web, so you might Google it. Usually Grainger is the HIGHEST price, but this time they were low. Go figure...... 
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Bob and Carol
2007 Travel Supreme Alante 45MS14
2006 Lexus LX470 Toad
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