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Open Roads Forum  >  Tech Issues

 > Help! A/C only works when below 100°

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2oldman

NM

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Joined: 04/15/2001

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Posted: 08/06/21 04:43pm Link  |  Quote  |  Print  |  Notify Moderator

time2roll wrote:

Post the voltage in the RV and the amp draw on the A/C circuit.
Yes.. is the CG voltage ok?

Espee

Valencia, Ca

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Posted: 08/16/21 10:48pm Link  |  Quote  |  Print  |  Notify Moderator

Thanks for all the responses.
I have tried to follow up on everyones suggestions… other than calling out a tech for an intermittent issue, or just replacing the unit. [emoticon]

Voltage is above 110v when fan/comp are operating.
Current spike is about 4 amps for fan motor then settles at 2ish amps, and spiking about 26 amps for herm comp settling at 14ish amps from what my clamp on can catch. So running about 16.5a in the upper 90°’s here (within factory specs).
Fairly clean coils from visual inspection (better than my 4 ton at the house).
No ice buildup.

I had been looking everywhere for a replacement Positive thermal coefficient resistor (wsx-7) as suggested, but it was out of stock everywhere (dometic called it a motor starter, but said it had been discontinued). I finally found a coleman hard start kit with a capacitor that included the same PTCR wsx-7 replacement I was looking for at a parts house in Reno. It had a cap rated at 43-53 Mfd. vs my original cap that was rated 43-52 MFD, so I didnt swap it out just yet as my current ratings were still ok for now (IIRC, one Mfd higher on replacement specs is not an issue, so I will save it as a backup for now). I swapped out the PTCR and its running normal for now.
Now just need a few days over 100° to see if we got this fixed. FWIW I saved the old “thermistor” for further testing if I can find a diagnostic procedure for it…


2007 Ram 2500, 4X4, 6.7 w/ xbrake
06' Cougar 285EFS, custom tanks
Honda EU2000i, Trojan T105's, Portawatz 1750, DISH.... all just for roughin' it!


bucky

Raleigh metro

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Posted: 08/17/21 03:44am Link  |  Quote  |  Print  |  Notify Moderator

^^^^^^^^^^^^^ It's rare anymore that someone comes on here with a well explained specific issue that gives the brains on that particular subject enough data to help.
Then the OP has the ability and the tools needed to follow the advice to a probable good result.
Rare indeed and kudos to all involved to this point. That's how this forum used to be.


2005 Cummins 3500 2WD LB quad cab dually pulling a 2014 Blue Ridge 3025RL


MrWizard

Traveling

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Posted: 08/18/21 01:08am Link  |  Quote  |  Print  |  Notify Moderator

ESPEE congrats, job well done ,
Nice to get the feedback on the results,
MANY TIMES people don't post back


I can explain it to you.
But I Can Not understand it for you !

....

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wapiticountry

Mountain West

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Posted: 08/18/21 07:52am Link  |  Quote  |  Print  |  Notify Moderator

wa8yxm wrote:

prichardson wrote:

Ditto of Lou. Make sure the the condenser coil is clean.
.(My hands are xxl or xxxl depending on the brand of glove)
So what the women say is true: Big Hands....Big Dickies (the brand, not what the mind in the gutter people are thinking) .

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