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Topic ClosedHard Start Cap For AC
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Webstas View Drop Down
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Joined: 16 Jul 2014
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Posts: 28 		Direct Link To This Post Topic: Hard Start Cap For AC
    Posted: 09 Sep 2014 at 1:56pm
I wired in a Supco Hard Start Cap into my 2015 172 it has a penguin 2 dometic roof mount unit, here  is the diagram i found on the AC wiring box, and how i wired it.
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Webstas View Drop Down
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Posts: 28 		Direct Link To This Post Posted: 09 Sep 2014 at 1:58pm
According to what i have read i believe i have it setup correctly, no fires or hot wires so thats a plus.
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techntrek View Drop Down
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Posts: 9062 		Direct Link To This Post Posted: 10 Sep 2014 at 8:31am
Good info.  Were you having issues starting it with a generator?
Doug ~ '10 171 (2009-2015) ~ 2008 Salem ~ Pod instruction manual
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Posts: 309 		Direct Link To This Post Posted: 10 Sep 2014 at 10:38am
Interesting (tho, unfortunately, I don't know beans about things electrical). By "hard start cap", I'm guessing you're referring to a capacitor, yes?

So, questions come to mind.  Like, how do you know if you need one?  What problem is it solving?  Could everyone (with an A/C) use a mod like this?

Thanks in advance.
John & Teri
Tundra 5.7L V8 / RP 180
E2 WDH / Integrated controller (POS) replaced by Tekonsha P3
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Posts: 6128 		Direct Link To This Post Posted: 10 Sep 2014 at 11:22am
It gives a little more boost to the "starting load" of the a/c compressor, for some, it will allow an underrated generator to start the a/c. Running it isn't usually an issue, just getting past the surge load need at start up is. 
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Webstas View Drop Down
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Posts: 28 		Direct Link To This Post Posted: 10 Sep 2014 at 12:10pm
Yep i was having issues getting my generator to start my ac compressor, unfortunately the cap wasnt quite enough to fix the issue but it definatly helped.
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Posts: 28 		Direct Link To This Post Posted: 10 Sep 2014 at 12:11pm
Sorry yes its a hard start capacitor from supco, i got it on amazon for 12$ it was well worth it
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Seanl View Drop Down
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Posts: 633 		Direct Link To This Post Posted: 10 Sep 2014 at 12:49pm
Originally posted by Webstas

I wired in a Supco Hard Start Cap into my 2015 172 it has a penguin 2 dometic roof mount unit, here  is the diagram i found on the AC wiring box, and how i wired it.


I think you are correct. Here is a good site with info installing a Hard start CaP
Sean, 2011 Rpod RP-173,2009 Jeep Liberty Rocky Mountain Edition
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Luv2Q View Drop Down
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Posts: 309 		Direct Link To This Post Posted: 10 Sep 2014 at 2:04pm
Thanks all .. Very informative discussion.  Ditto on the link to modmyrv (http://www.modmyrv.com/2009/05/27/rv-air-conditioner-hard-start-capacitor)

This looks like a really useful mod to keep in mind if hard starts, especially with a gen, ever become a problem.

Thanks again.
John & Teri
Tundra 5.7L V8 / RP 180
E2 WDH / Integrated controller (POS) replaced by Tekonsha P3
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