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AC/ generator question
Kind of a Long winded 2 part deal, I've got a 99 U320, 12kw powertech generator, and 3 newer-ish domestic air conditioners (I've had this coach for just over a year, they were supposedly new a year or so before I bought it) had a bearing go out...

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Re: AC/ generator question
Reply #1
I'm not a expert on this stuff, but I believe the generator has to run at a specific RPM (usually 1800 RPM on big units).  If you adjust the engine speed the output voltage will change (as you observed) BUT the output frequency (Hertz) will also...

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  • Last Edit: June 23, 2020, 11:37:14 am by Chuck & Jeannie

Re: AC/ generator question
Reply #2
175 volts can take out an AC appliance.  As far as what is destroyed in your Dometic units I would call Dometic and see who they recommend to call.  I've given a link to the following threads as they may give you a better understanding why having...

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Re: AC/ generator question
Reply #3
I will add, as far as I know I never tried to start the AC units with that much voltage. I was checking voltage with the breakers shut off. I turned them back on after I slowed the generator down, so they only saw 120v, but not sure about the...

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Re: AC/ generator question
Reply #4
That looks like a handy little meter. I ordered one of those too. Thanks

Re: AC/ generator question
Reply #5
Sounds like the voltage regulator has failed.  Changing the RPM changed the cycles from 60 to ? because you need a meter to set this through the engine RPM. No way to adjust this by sound.  Now all this rambling brings me to this:  you most...

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Re: AC/ generator question
Reply #6
As a side benefit of this install it incorporates a hertz display for both channels

M2 AC Multimeter - Blue Sea Systems

Re: AC/ generator question
Reply #7
Start, Run Capactors are sometimes a cause of no start run . They are not expensive and are easy to replace. For less than the price of a Service Call you can but a Capacitance tester, measures in microwave farad symbol uf.
Safe Travels
Dave

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Re: AC/ generator question
Reply #8
Sorry you are working through this problem caused by your generator.

Another point to emphasize is to change gen end bearing before it takes out the several thousand dollar generator end.

Supporting the recommendation for Progressive Industries EMS...

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Re: AC/ generator question
Reply #9
I've ordered a new voltage regulator to hopefully solve the generator issue, and I've also ordered the capacitors for the AC unit to try after I get the generator sorted out. I appreciate the help and ideas, I'll report back with results, good or...

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Re: AC/ generator question
Reply #10
Well, part one of my update, voltage regulator showed up today, and my kill a watt meter. Voltage is now at 119.8, and putting out 60 hertz with the generator at the correct RPM. Capacitors are supposed to be delivered for the ACs tomorrow, and...

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Re: AC/ generator question
Reply #11
Well, no luck on the AC repair. Replaced both capacitors, same results. Rear AC compressor hums, and gets hot, but no cooling, and front compressor tries to start, and won't. Assuming I need to replace them, any direct replacement for a Dometic...

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Re: AC/ generator question
Reply #12
I just replaced my air conditioners, they had many issues and were 21 years old.  I installed the new Penguin II 15K BTU with the heat pump, the inside filter returns and a new thermostat.  Easy installation and used all of the existing wiring. ...

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  • Pyolet
  • [*][*][*][*]
Re: AC/ generator question
Reply #13
Amazon.com: Dometic 651816CXX1C0 Penguin II Heat Pump 15 - Polar White:...

Well, no luck on the AC repair. Replaced both capacitors, same results. Rear AC compressor hums, and gets hot, but no...


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