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Old 11-24-2008, 12:12 AM   #15
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Gary, do you have a capacitor checker? I paid about $35 for mine many years ago; wish I were closer to you, so we could check it. You know where I am at, so, if you pass by and don't have this resolved be then, stop in and see me.

Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
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Old 11-24-2008, 04:37 AM   #16
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No I don't, Mike. Maybe I can swing by your place and see you in the spring. We would love to see you & Amy again anyway!

Nothing urgent about this problem, but I worry a bit that it might eventually get worse or fail altogether.

I'm active in the American Coach Owners Club and regularly hear reports of AC owners using their heat pump down into the high 30's when necessary. Nobody has said anything about compressor start-up problems, but many of them may be "deaf' to what is actually going on.

Gary Brinck
2004 American Tradition; 2014 Buick LaCRosse
Homebase in the Ocala Nat'l Forest near Ocala, FL
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Old 11-25-2008, 10:00 AM   #17
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After re-reading your initial post, you are absolutely correct RV Roamer, the thermostat has nothing at all to do with the compressor starting as you described it. It begs the question, however, why only in heat pump mode unless it relates to the ambient temperature? The cycling sounds to me that perhaps the system may be popping an internal thermal breaker because the start winding of the motor continues to draw high current and is not cut off because the motor did not spin up quickly enough. The breaker then cools and resets starting the cycle again. (Not sure if this is the way these compressors are built though)

In my coach (wired for 50 amps) the RVP basement unit has two compressors and they serve both functions, with both being required in the heat pump mode. It does have an outdoor temperature sensor to prevent starting the heat pump needlessly. Cooling is carried out with one or both as required, depending on conditions. However, this may vary with thermostat model and/or air conditioner model involved. If I were to be connected on a 30a supply, the 2nd compressor is not available and, of course, the heat pump would not function at all.

I offered this information because, in many cases, people don't understand what is actually supposed to take place in their specific system and report all kinds weird things that are perfectly normal. The discussion then gets sidetracked very quickly with complex solutions that may not even apply.

I just find that the RVP manual covers this process rather well if one takes the time to read and understand it. The RVP thermostat for my model is quite complex (much more so than simply off or on) and has been quite problematic (my personal experience). This has resulted in some interesting reports on this subject on other forums and which will sometimes defy analysis unless the understanding is there.

You appear to have analyzed and understood your specific problem and did not need this piece of advise.

Alfa 38 5ver (Florida)
Montreal/Florida Snowbird
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