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Open Roads Forum  >  Tech Issues

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

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Espee

Santa Claritap, Ca

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Posted: 08/04/21 10:24pm Link  |  Quote  |  Print  |  Notify Moderator

Hopefully someone can help me diagnose…
Cooking here in Lone Pine CA at 105° this afternoon.
I know the cycles / behavior of this Dometic Brisk 2 Air conditioning unit (15k btu), so I think can articulate what it should / not be doing.
It starts normal operation but I hear the compressor drop out after about 5 minutes.
I hear the relay in the module send what I presume is a command to cycle the compressor a few minutes later but nothing happens and it just blows warm air until I shut it off for 15-20 min. Then we can repeat the cycle. Once temps drop below 100° it seems to consistently operate normally (compressor stays engaged), but not totally confident on that yet. Currently the compressor engaging sounds like a much softer start than I remember over the years of operation. I am leaning a capacitor on the edge of failure but would appreciate any other input to verify. I typically maintain a 22° return / supply differential and unit appears to be clean well maintained otherwise. This has been an intermittent issue for a number of months now…
Thanks
Jeff


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wildtoad

Blythewood, SC

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Posted: 08/04/21 11:30pm Link  |  Quote  |  Print  |  Notify Moderator

My advice is to call a RV AC technician.


Tom Wilds
Blythewood, SC
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Seon

Lake Camanche, CA

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Posted: 08/05/21 06:30am Link  |  Quote  |  Print  |  Notify Moderator

I had a similar problem AC cooled fine but when ambient temp reached 100° it'd trip the breaker. Thinking the capacitor was failing, had it tested and it was okay. Being the unit was 10 yrs old just decided to replace with new. Best decision made.

LouLawrence

Traveling the US!

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Posted: 08/05/21 07:01am Link  |  Quote  |  Print  |  Notify Moderator

Try cooling the whole thing down with some water from the hose. Also check to ensure there is no blockage of the outside cooling fins. Remove the top cover and check to ensure there is nothing blocking proper air flow as well.

3 tons

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Posted: 08/05/21 08:09am Link  |  Quote  |  Print  |  Notify Moderator

As I recall on my Coleman Mach 1, there is a high temp bi-metallic cut-out switch at one of the compressor terminals atop compressor…Sounds like a problem based on a certain pre-prescribed temperature…

3 tons

prichardson

Lafayette, La

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Posted: 08/05/21 08:09am Link  |  Quote  |  Print  |  Notify Moderator

Ditto of Lou. Make sure the the condenser coil is clean.

jjrbus

FT Myers FL

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Posted: 08/05/21 01:30pm Link  |  Quote  |  Print  |  Notify Moderator

On top of most compressors is a high temperature coefficient resister or switch for most of us that senses temperature. Not pressure or amps . So is yours working right and doing its job protecting the system or is it failing? If I were you that is the first thing I would be looking at. Lots of info on the net on how to test.
And is your power source up to snuff, generator putting out right, power grid dropping when everyone has AC on and you are actually in brownout conditions?

wa8yxm

Davison Michigan (East of Flint)

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Posted: 08/05/21 05:49pm Link  |  Quote  |  Print  |  Notify Moderator

prichardson wrote:

Ditto of Lou. Make sure the the condenser coil is clean.
Double ditto

On most A/C's (Coleman is the exception) they BLOW air out from inside through the condenser so "Crud" builds up on the fan side of the condenser.
When this happens the system can not shed heat. it builds up. pressures go up and Click goes the breaker.

Colemans. (Air Xcel) Suck. So you see the crud on the outside (back)( of the condenser. Remove 4 bolts. lift cover, peal crud off replace cover 4 bolts. good to go.

Ohters it's like a dozen screws. then remove shroud, then you need to figure out how to remove inner cover over condenser (sometimes that's just a few more screws. other times you don't want to know) and if you have tiny hands (not) like I do remove the fan in order to do a proper cleaning....(My hands are xxl or xxxl depending on the brand of glove)


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Fulltimers

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Posted: 08/05/21 09:02pm Link  |  Quote  |  Print  |  Notify Moderator

Check to see if it is icing up.


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time2roll

Southern California

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Posted: 08/05/21 09:49pm Link  |  Quote  |  Print  |  Notify Moderator

Post the voltage in the RV and the amp draw on the A/C circuit.


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