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Old 05-01-2017, 09:44 AM   #15
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My #2 compressor does not turn on under generator power, just under shore power will it kick on.


You might have a bad Run or Start Condenser is kind a what I've been finding
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Old 05-01-2017, 04:54 PM   #16
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My #2 compressor does not turn on under generator power, just under shore power will it kick on.
What year/model MH and 30 or 50 amp service?
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Old 05-01-2017, 05:03 PM   #17
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We've got different RVs being discussed here. I'm confused as to whether it's a 30 amp system with an EMS to control loads or not. In many 30 amp systems, the second A/C is only powered by the generator. Step one would be to be sure power is present at the second A/C. In some of the explanations so far, it sounds like A/C #1 does all the work and #2 only kicks in when the first can't handle the load. With two identical A/C systems, it sounds a little odd to be configured like that.

All these things should be sorted out before just buying new starting capacitors. Also, many A/C systems use a capacitor with dual functions, part starts the fan and part starts the compressor. Easy to tell by the number of wire connections on the end of the capacitor.
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Old 05-01-2017, 05:30 PM   #18
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We've got different RVs being discussed here. I'm confused as to whether it's a 30 amp system with an EMS to control loads or not. In many 30 amp systems, the second A/C is only powered by the generator. Step one would be to be sure power is present at the second A/C. In some of the explanations so far, it sounds like A/C #1 does all the work and #2 only kicks in when the first can't handle the load. With two identical A/C systems, it sounds a little odd to be configured like that.

All these things should be sorted out before just buying new starting capacitors. Also, many A/C systems use a capacitor with dual functions, part starts the fan and part starts the compressor. Easy to tell by the number of wire connections on the end of the capacitor.
This is a basement unit, 2 compressors in a single unit sharing the inside ductwork and fan. When you first turn on the A/C compressor #1 will come on along with the outside and inside fan. After a few seconds the #2 compressor will come on. Once the inside temp has reached the set point the system will attempt to cycle #1 compressor on and off to maintain the set temp. If #1 compressor can't maintain the temp it will turn on #2 compressor as well.

He has a EMS system and it will run both compressors on 30 amps, drawing 23-24 amps, assuming no other loads. These units have separate start and run caps for each compressor as well a a run cap for the fan motor. I just replaced the start caps on our unit. Start cap, actually PTCR attached to it was fried. Not sure why but seems these problems are always with the #2 compressor. Probably because the electrical system is already under a load, #1 compressor and fans running, when #2 compressor tries to come on line.

Also sounds like he has 50 amp RV and 50 amp supply. That's why he 's using the generator. When connected to 50 amp supply the EMS does not show amp usage, only on 30 or 20 amp supply or generator.
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Old 05-01-2017, 06:27 PM   #19
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Originally Posted by Pacakazz View Post
My #2 compressor does not turn on under generator power, just under shore power will it kick on.
I suggest you start a new thread for your issue this way there should be no confusion...let us know year/model and 30 or 50 amp service.
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Old 05-02-2017, 10:25 PM   #20
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I suggest you start a new thread for your issue this way there should be no confusion...let us know year/model and 30 or 50 amp service.
He has a gasser with 2 roof units per his profile- model 33V. A new thread is necessary.
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