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04-21-2013, 05:57 PM
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#1
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Member
Join Date: Feb 2013
Location: Yorba Linda, California
Posts: 48
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Dometic AC Heat Pump Poor Performance
We are currently at Lake Havasu in Arizona with temps hitting the high 90s.
The front Dometic AC seems to be working very poorly and can't even begin to cool down the coach. We only have 30 amp service and can't seem to run both units at the same time, but even just running the front unit,performance is lousy.
Is anybody else out there experiencing the same issue? By the way, the AC only rear unit cools like a champ.
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04-21-2013, 06:16 PM
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#2
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Senior Member
Join Date: May 2012
Posts: 277
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What size is the A/C, 13,500 or 15,000 Btu? Makes a lot of difference. Check the temp at the return and at the outlet and see what kind of differential you have. It is hard to cool a large RV with a 13,500 Btu unit when it is 90d. Outside.
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04-21-2013, 11:34 PM
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#3
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Moderator Emeritus
Nor'easters Club Workhorse Chassis Owner iRV2 No Limits Club
Join Date: Oct 2004
Posts: 30,785
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30 amp you can run 1 AC not two if you need two run GEN for 50 amp.
Run the Gen to see if you have improved cooling out of front AC you may have a low power problem in campground.
You have thermistart programmed for cooling.
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04-21-2013, 11:46 PM
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#4
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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I've run both 13.5 heat pumps off a 30 amp circuit, but you do have to watch the loads when doing it.
I've also found that in Yuma in 90° temps we could do just fine with 1 heat pump. We have the dual pane windows and the optional (in 2002) roof insulation package.
__________________
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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04-22-2013, 02:34 PM
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#5
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Member
Join Date: Feb 2013
Location: Yorba Linda, California
Posts: 48
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Thanks all.
It is a 15000 BTU unit. We tried running the generator and it makes a huge difference, not only in the coolness but also in the amount of air flow. There might be something about the lower power in this campground, it's full and everyone is running their ACs.
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04-22-2013, 04:30 PM
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#6
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Senior Member
Newmar Owners Club
Join Date: Jul 2006
Location: Wellington, Florida
Posts: 13,599
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Hi hookup,
The low power, and does the coach face west make a huge difference. If you do have low power, the heat pump is really taking a beating. You may want to consider a voltage regulator to help save the high wattage appliances. Go to 50 Amp RV Voltage Regulator - Technology Research Corp 10175 - Surge Protectors - Camping World to see the voltage regulator I have.
__________________
Gary
2005 Newmar KSDP 3910 + GMC ENVOY XUV 37K lbs Moving Down The Road
The Avatar Is Many Times Around The USA
Nobody Knows Your Coach Like Somebody Who Owns One Just Like Yours
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04-22-2013, 05:54 PM
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#7
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Senior Member
Join Date: May 2012
Posts: 277
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Check the voltage when plugged into campground power and check it unplugged with generator running. Anything below 105 volts not good.
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04-22-2013, 06:25 PM
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#8
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Member
Join Date: Feb 2013
Location: Yorba Linda, California
Posts: 48
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Thanks, more great input.
And yes, the slide side is facing west without one square inch of shade.
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