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Old 08-21-2016, 05:15 PM   #1
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86 outside - 82 inside - AC running all day?

2017 Sunova 36z with 2 heat pumps. This morning the AC's (both set at 70) started running non stop when it was 77 degrees outside. The temperature in the RV keep rising throughout the day; with both units continually running. The high today was 86 (Cape Hatteras, NC) and inside the RV it is still 82 degrees.

There is "coldish" air blowing through all the roof vents. I don't know if it is not as cold as it should be. We traded in a 2010 Sunstar that also had 2 heat pumps that kept the RV cool in weather like this, and even hotter. The Sonova is 4 feet longer and much bigger inside with 3 slides.

Does this sound normal to you, or do you think we have a problem?

Thanks for any advice on this.

Ken
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Old 08-21-2016, 06:10 PM   #2
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It sounds like the same cooling I'm getting on a one week old Suncruiser 38Q. 92 degrees outside and 85 inside. Two 13.5 heat pumps on the roof. My trade, a Newmar had no problem cooling a similar size coach. The dealer said the AC's are working properly.
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Old 08-21-2016, 06:18 PM   #3
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I think you have a problem. Where to start is a real dilemma. Some random approaches to consider:
- Is the t-stat properly set? If you have zones is each one separately turned on to 'cool, auto or high?'
- Is your power source sufficient to start / run both A/Cs? 30 amp might run both with nothing else tUrned on...50 amp is best. Should try running generator and attempting A/C restart.
Start with these and let's see what happens...
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Old 08-21-2016, 06:38 PM   #4
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Bob
Certainly appreciate what your dealer says, but - try putting a thermometer of some sort up against one of the main vents (tape it in place)...if you don't get a reading of ~ 20 degrees less than the outdoor ambient temp you should talk with the dealer again. You should also open a ceiling vent a few inches, check that all vents are open (we had 2 clogged ones on a brand-new rig), and consider having one or both A/C fans on full-time.
It's certainly true that dual unit rigs in your size do have some difficulty in hot temps - you're description of the temp difference still makes me wonder about the dealer's assurance.
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Old 08-21-2016, 06:42 PM   #5
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Try pulling and cleaning the filters and making sure any nuts or screws you see that hold the unit to the ceiling are tight.
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Old 08-21-2016, 06:51 PM   #6
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Originally Posted by Floridakamper View Post
It sounds like the same cooling I'm getting on a one week old Suncruiser 38Q. 92 degrees outside and 85 inside. Two 13.5 heat pumps on the roof. My trade, a Newmar had no problem cooling a similar size coach. The dealer said the AC's are working properly.
Were your heat pumps running continuously and the temp inside was 85? How humid is it where you are?

It seems madness to me that these new RV's can not keep cool inside.
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Old 08-21-2016, 06:53 PM   #7
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Bob
Certainly appreciate what your dealer says, but - try putting a thermometer of some sort up against one of the main vents (tape it in place)...if you don't get a reading of ~ 20 degrees less than the outdoor ambient temp you should talk with the dealer again. You should also open a ceiling vent a few inches, check that all vents are open (we had 2 clogged ones on a brand-new rig), and consider having one or both A/C fans on full-time.
It's certainly true that dual unit rigs in your size do have some difficulty in hot temps - you're description of the temp difference still makes me wonder about the dealer's assurance.
Bob - What would opening a ceiling vent a few inches accomplish. It would seen that would just let any cold air inside escape.

What am I missing?
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Old 08-21-2016, 06:54 PM   #8
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It sounds like kwilkens and I both have a problem. I'm not accepting the dealer's explanation that all is well. I have a number of other issues and one that I'm hoping will get fixed tomorrow. We have to be in the northeast here pretty quick for a month or so. I'm counting on Winnebago to somehow help me solve this and I intend to get it solved. I've checked the intake temps at the hottest part of the day and the discharge. I'm getting about a 10 degree difference. Again the dealer told me that is within spec.
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Old 08-21-2016, 06:56 PM   #9
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Were your heat pumps running continuously and the temp inside was 85? How humid is it where you are?
They both ran continuously. Right now in the evening, everything is fine.
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Old 08-21-2016, 07:48 PM   #10
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They both ran continuously. Right now in the evening, everything is fine.
We have had the same experience today. About an hour or so after the sun went down the RV started to cool down.

Please let me know what Winnebago and/or your dealer says. This is our first day of vacation and the weather is going to be hot the rest of the week.
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Old 08-21-2016, 08:02 PM   #11
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Our coaches are essentially sealed metal boxes...at times the rate of heat gain exceeds the ~ 20 degrees max cooling effort available...opening a ceiling vent helps exhaust the warmest air at the ceiling and reduce some of the load on the A/Cs...

In the heat of the day deploying the awnings and closing all shades can also help...
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Old 08-21-2016, 08:18 PM   #12
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kwilkins, check the chill grill unit to make sure the return air and cool air are not mixing in the grill unit.
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Old 08-21-2016, 10:14 PM   #13
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Do you have all the window shades down and the front shades down for room blackout not just darkening? If not pull them both down fully. Check the air flow from each vent to see if you are actually getting any air out. Don't wait until the MH gets hot to attempt to cool it down, set the temperature at let's say 70 or colder before sunrise and let them get to work early. Keep all the shades down. Make sure fan is on AUTO and control is set to AC.
I've had no issues with mine keeping the MH down to 65 in the hottest of weather.
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Old 08-22-2016, 05:12 AM   #14
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Do you have all the window shades down and the front shades down for room blackout not just darkening?
I do and the big awning and door awning. On the front AC I get a 20+ degree difference early in the day and late in the day. Between about 3 p.m. and 7 p.m. I get a 10 degree difference. The back AC has good cold air discharge all day but in the hottest part of the day that area gets up to 78 or 79 degrees. The 85 degrees is the temp we can't live with.
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