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 > Air conditioning in new 5th Wheel

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ford truck guy

Pennsylvania

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Posted: 07/18/20 06:18pm Link  |  Quote  |  Print  |  Notify Moderator

our last fiver had 2 AC's and the struggled to keep me cool in direct sun, all day.. I Made some improvements that helped greatly... Removed round vet collars, they are sticking Into the ducts about 1-1/2 inches.... I cut them all down to be just a hair longer than needed... reinstalled them and used foil tape to seal them... I also re insulated our front closet, that helped a lot as well...

now we have 3 AC's and OMG, what a difference.... 42' dark fiver in all sun in 95+ and DW tells me to turn the temps up as she is cold ! ! ! [emoticon]


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Gearitis

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Posted: 07/18/20 07:59pm Link  |  Quote  |  Print  |  Notify Moderator

Regardless of brand of RV, there maybe an issue with return air not making into the exchange correctly. On all of the RV's I have owned over the past 30 years, I have always taken the air conditioner bezel off inside and foil taped around the sides so air does not get between roof and ceiling. Only the ducting, will be allowed air if you have ducting. Also the, so called plenum between the cold air and the warm return air may need to also be foil taped to keep the air conditioner from just recirculating air that has already been cooled. If your cold air is just sucked back in the return then you are not circulating the cooled air. My last 5er I had to do that on both air conditioners. I keep an infrared thermometer handy to check the vent temps and expect a 20 degree or more differential after about 30 minutes of running it. But I would sure look at the air not being circulated right in the area just under the air conditioner on both units. My dad had a brand new Cardinal and he was having an issue with not cooling correctly. Took it in and they said was all good. I drove 5 hours to his location with my handy dandy foil tape. We took off all vents and bezels and taped the connections between the vent and pathways at the air conditioner and final destinations in the RV and now on 100 degree days, in East Texas, he is in a 68 degree RV. Just my 2 cents.


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CLHEJ

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Posted: 07/18/20 08:35pm Link  |  Quote  |  Print  |  Notify Moderator

Thank you all.

FWIW, we have a 41' five with 4 slides. 15k ac unit in the living area and a 13.5k unit in the front bedroom.


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Posted: 07/18/20 09:13pm Link  |  Quote  |  Print  |  Notify Moderator

Both ACs in my Solitude 3950 have been running full bore in the PA mountains since Wed. I am in full sun from noon until sundown. Temp inside is 84 at 2 PM. Outside 89. Temp of air at outlet is 54. 15K btu units. After sundown interior will drop to 72 and units cycle. Previous GD reflection with 2 15K units was close to the same, on same site, same time of year.

scbwr

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Posted: 07/19/20 04:43am Link  |  Quote  |  Print  |  Notify Moderator

The OP mentions that the thermostat is set at 73. What happens if you lower the thermostat setting? Are the AC units running continuously or are they cycling out? The location of the temperature settings in our Bay Star requires adjusting the thermostat more often when in very hot temps.


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MFL

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Posted: 07/19/20 04:58am Link  |  Quote  |  Print  |  Notify Moderator

CLHEJ wrote:

Thank you all.

FWIW, we have a 41' five with 4 slides. 15k ac unit in the living area and a 13.5k unit in the front bedroom.


This info helps, and changes my thought of "something is wrong". That is a lot of space to cool, and the multiple slide roofs, that are not insulated as well, may add to cooling issue.

I agree with others, check for cooling loss into roof, around vents, seal any area that could leak. With ceiling AC covers removed, look up, check for any areas needing a better seal, taping with foil tape.

If you find no issues, you may need to add the 3rd AC, to maintain a 73 degree setting in high heat conditions.

Jerry





goducks10

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Posted: 07/19/20 08:33am Link  |  Quote  |  Print  |  Notify Moderator

How is your 5er situated compared to the suns movement and how many and how big of windows are on the sun side?
Sitting in the direct sun all day is going to be the biggest issue IMO. Even getting a jump on it in the morning it's still going to be hard to get much lower than 10-15 degrees from the outside temps if you have lots of windows in the suns path.

TXiceman

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Posted: 07/19/20 08:35am Link  |  Quote  |  Print  |  Notify Moderator

wanderingaimlessly wrote:

CLHEJ wrote:

Thanks for your response. We have been here overnight already. It does seem like the air is coming out cool. Just not cooling the unit down during the day.

If the air exiting the unit is 10 or more degrees cooler than the air going in, thats about all you can expect.
Putting air pillows in any skylights, putting additional insulation on windows, especially those facing afternoon sun will all help.


Wrong. The air exiting the unit should be 18 to 20 degF lower than the air entering the unit. DO NOT use an infrared(laser) temp gun for air temperature. It will only measure solid surface temperatures.

With a hot RV, it may take overnight to get it completely cooled down. DO you have two 15,000 BTUH units or two 13,500 BTUH units? The A/C has to cool the air down inside the RV, and also all the cabinets, walls and furniture.

Keep awnings out if not two windy an the south and west side. Keep window shades closed, put Relectix in the windows on the sunny side, park in a shade.

Take down the inside ceiling assembly and make sure that the dusts are sealed so that it is not bypassing sit internally or blowing air into the ceiling. Use the foil tape to seal up openings.

Ken


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memtb

Wyoming

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Posted: 07/19/20 09:23am Link  |  Quote  |  Print  |  Notify Moderator

As some have stated, it will take time to cool the interior as everything inside acts as a “heat sink” .....stored heat. Until the “heat sink” is cooled, the ac will have a lot of work to do! And, as some have mentioned....on the sun exposed side, bubble foil on the windows, and the pillow in the roof vents should help. Kinda like camping in very cold....sometimes you have to assist the unit.

A few years ago, we were in Mesa, Az in August for some repairs. When at the shop (camped in their lot) we were hooked up to their power.....only an extension cord. So, we could only run one ac, it kept our 5er tolerable......barely! A second ac would have been welcome! memtb


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Second Chance

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Posted: 07/19/20 10:28am Link  |  Quote  |  Print  |  Notify Moderator

Pull the trim panel on the underside of the ACs and make sure the baffle that separates the cool output side from the warm return side is in place and well-sealed with foam tape or something - especially if the ACs are Dometic (the new Coleman Machs are a bit different). This is a common issue with ducted RV ACs and making sure the two streams are sealed and separate makes a huge difference.

If you have single pane windows, go to a home improvement store and buy a big roll of Reflectix "bubble foil" insulation. Cut pieces to fit inside the window frames and push the pieces into place. The bigger the window, the greater the impact (full disclosure - my wife HATED the cave feel when I did this in our Reflection 337).

Make sure the basement doors stay closed and use the main door as little as possible.

Extend the awning to protect the side of the trailer that's toward the sun if possible.

Good luck... this heat wave is brutal everywhere right now!

Rob


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