Need info: Dometic RV Roof Top A/C


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AZgl1800
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Need info: Dometic RV Roof Top A/C

Post by AZgl1800 » Wed May 30, 2018 8:29 pm



Hey!! You guys that work on, or know about, RV Roof Top a/c units. how much Temperature Differential should there be? My unit is only doing 10°F differential between Inlet and Outlet temps.

mine is a Dometic 59530.(X)3(X)(X) and the compressor pulls 8.0 amps at full run, 120 VAC of course.
I just installed a new fan blade for the outside heat exchanger, old one was warped.





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Re: Need info: Dometic RV Roof Top A/C

Post by WingAdmin » Wed May 30, 2018 8:33 pm

It should definitely be doing more than 10 degrees, you will get more than that from a peltier junction cooler!

And I hate to say it...but if it is low on coolant, get ready to break out the wallet, because it uses ancient, now-banned R-22 refrigerant, which is just about impossible to find, and astronomically expensive if you can find it.

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Re: Need info: Dometic RV Roof Top A/C

Post by AZgl1800 » Wed May 30, 2018 8:34 pm

yeah, I was hoping for at least 20°F and the HVAC in my house is close to 39°F


i used to have a 30lb bottle of R-22 but someone stole it a couple decades back.

when that new rule came out, I stopped at every auto supply house between Albuquerque and Flagstaff, AZ and bought every can of R-22 they had.... lasted me a long time.... had a 1974 Suburban back then, and it leaked enough to need a refill every six months.
See you at NASR-11 July 10th, 11th, 12th 2018

https://goo.gl/maps/2zH93W9YW372

515 E Eads Pkwy, Greendale, IN 47025
812-537-4441

http://www.northamericangoldwings.com/c ... 9-nasr-11/

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WingAdmin
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Re: Need info: Dometic RV Roof Top A/C

Post by WingAdmin » Wed May 30, 2018 9:46 pm

That 30 lb tank would be worth $500 today!

I can remember when you could buy pellet guns that were powered from R-22 canisters, because the stuff was so cheap. If we only knew then...

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Re: Need info: Dometic RV Roof Top A/C

Post by DaveO430 » Thu May 31, 2018 5:59 am

AZgl1800 wrote:
Wed May 30, 2018 8:34 pm
yeah, I was hoping for at least 20°F and the HVAC in my house is close to 39°F


i used to have a 30lb bottle of R-22 but someone stole it a couple decades back.

when that new rule came out, I stopped at every auto supply house between Albuquerque and Flagstaff, AZ and bought every can of R-22 they had.... lasted me a long time.... had a 1974 Suburban back then, and it leaked enough to need a refill every six months.
That 74 suburban used R12, not R22.

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Re: Need info: Dometic RV Roof Top A/C

Post by themainviking » Thu May 31, 2018 6:10 am

RV units are similar to home Air Conditioners, only smaller and less efficient. The label you provided does not list the BTU Capacity, but I would not be surprised if a Dometic unit at 8 amps could only pull the air down 10 degrees. The 13,500 units on Airstreams which run at 15 amps can only pull it down about 15 degrees. In Arizona, due to the lack of humidity in the ambient air, you will not get the air drying effect (lack of humidity also feels cooler).

Is your home unit a Swamp Cooler? When I lived in New Mexico, that is all anyone had. They will bring the temps inside down to 62 degrees, which is the evaporative point of water. If the house is hot, it will take several days.
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AZgl1800
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Re: Need info: Dometic RV Roof Top A/C

Post by AZgl1800 » Thu May 31, 2018 10:43 am

When we lived in Borger/Stinnett Texas area, our home was cooled by a huge 3500 cfm swamp cooler, very familiar with those.

then in Mesa, AridZona I bought a double stage swamp cooler for the back patio, set it on one side and 4,000 cfm would cool the entire length of an 80 ft wide patio.... those were the days alright.

here in Oologah, Oklahoma north of tulsa, it is running over 50% humidity most of the time....
that little roof top unit on the RV had to run for 3 or 4 hours before it really dropped the interior temp it seemed like...

actually, I was just in a hurry because it started out at 97°F interior temp and my daughter went out 3 hours later and reset the 'stat to 74°F, she said it was 'too cold'.....

okay, sounds like it is doing all it can do with just an 8 amp compressor on it.

I have a 11,500 BTU window unit in my garage that pulls 3.75 amps start, and runs at 1.5 amps
it does one hell of a good job, pulls the garage down to 68°F on a 100°F day

i really enjoy that one, lets me work on stuff any time I want..... my body can't handle humidity and high temps anymore.

Oh, the Suburban? yeah, it was R-12 freon..... I was still thinking HVAC mode :shock: :shock:

My 2001 Suburban is R-134 and I just had the thrill of replacing all of the good stuff on it last month, cost me $1350.
the compressor cratered and spewed junk everywhere.
the rear a/c line was leaking, oozing right thru the line itself..... and all of the O-rings were seeping....
the guy who fixed it is good, but I had to pay for a "Quality Job" to get it done Right.


See you at NASR-11 July 10th, 11th, 12th 2018

https://goo.gl/maps/2zH93W9YW372

515 E Eads Pkwy, Greendale, IN 47025
812-537-4441

http://www.northamericangoldwings.com/c ... 9-nasr-11/

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