Question about Dometic Rooftop RV Air Conditioner

1 Answer

I put R-134 in my Coleman Roof top AC unit. I found out a month later i needed to use R-22. Will the R-134 damage the unit? the unit was empty when i filled it with r-134. any suggestions.

Posted by on

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    President:

    An expert whose answer got voted for 500 times.

  • Master
  • 949 Answers

The oils used in the two different refrigerants are not compatible with each other. The will actually plug up some of the system tubing over time and will eat away at the compressor windings. The roof top unit should not have any rubber seals to worry about like a car.

The only thing you can do is remove the R-134A from the system, flush the system with liquid R-22, replace the compressor recharge it.

I know that is not what you want to hear but anything less than that will only be a short lived fix at best

Posted on May 11, 2010

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Btu of coleman 7830-901


That should be a 30,000 Btu unit. Its been a while since I worked on them. The 78 is the series or model, the 30 is the capacity or btu's and the 901 indicates it is a Copeland compressor.

Jun 09, 2014 | Coleman Air Conditioner Shroud Rv Roof Top...

1 Answer

Need to know the BTU's of a coleman rv roof air.


The limiting factor is the power available to run the device. Typically, roof air units are around 12,000 BTU.

Unless your rig is wired with a 50 amp service, you will not be able to run more than you have at the present with your 30 amp service. I have found that a rig with a microwave, a roof AC and a TV frequently cannot run all three at the same time. If you do have 50 amp service, you can add the second roof air. Also, if you have a 30 amp service, you can upgrade to 50 but that is an expensive proposition with the cord itself costing around $200.00. You would also have to upgrade the distribution panel and probably have a pro properly split up the load between the two 120 Volt AC buss'.

I hope this response helps you with your deliberation and thanks for your question @ FixYa.com

Aug 06, 2011 | Coleman Heating & Cooling

1 Answer

WHAT TYPE OF FREON IS IN THIS UNIT AS THE MANUAL DOESN'T SAY


Hi, I would have to say you have R-22 in this system. 134-a is for autos and some refrigeration commercial units. R-410-a is for the new residential units. and is a very high pressure freon. So, yes yours is R-22.
Sincerely,
Shastalaker7
A/C, Heating,

Sep 13, 2010 | Coleman Mach III Air Conditioner

1 Answer

My roof top unit is letting the condensation run into the coach.


Either you need to replace the square gasket between the ac and the roof or you need to seal/replace your roof..

Aug 03, 2010 | Coleman Mach III Air Conditioner

2 Answers

How difficult / expensive is it to install a heat strip in a Dometic roof top AC? The unit I have has a mark on the knob for heat, but I suspect it was never installed.


Fairly easy. The only thing that you must figure out is how many amps the heat strips will draw. Make sure the fuses and the breaker switch can handle them. And be aware your electric bills will shoot up.

Oct 20, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

My coleman mah 3 roof top will not blowon fan side


Sounds like you have either a bad fan motor or a bad fan motor capacitor. When you turn the unit on with the fan not working, the compressor (the humming noise) runs and gets real hot real quick resulting in the compressor cutting off ( the nothing after) on it's inside high temp switch. This is what the compressor is designed to do so that when this happens, it does not burn the compressor out. Replace you fan capacitor, give the compressor an hour to cool, then try it. In most cases and if I'm correct, the unit will run just like you want it to. Good luck.
Please rate solution

Sep 09, 2009 | Coleman Mach III Air Conditioner

4 Answers

Can my duo-therm air conditioner on my rv be recharged?


These unit can be recharged. 134A. You NEED A SERVICE TECH THAT KNOWS HOW TO CHARGE UNIT.RUS

Jun 24, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

How do you recharge a roof top ac unit


you will need to install access valves for charging.a set of gauges and r-22 . to by freon r-22 you need to be EPA certified. Tom

Jun 13, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

Coleman Mach roof top ac


Under the drain pan on each side should be a small plastic drain plug they might be clogged up with debris.

Jun 07, 2008 | Dometic Rooftop RV Air Conditioner

1 Answer

How to charge coleman mach-3 a/c roof unit 134 or 22


If it needs a charge the leak has to be found and fixed. If the leak has been fixed and you have a service valve on the low side. It should have a vacuum pulled on the system to remove all air and non-condensable gases from the system. Then you can charge the system : 1. by weight according to the name plate. 2. charge by superheat (temperature leaving the evaporator + 16°F) When using the superheat method to charge the higher the Ambient temperature the lower the superheat difference will be.

May 01, 2008 | Heating & Cooling

Not finding what you are looking for?
Dometic Rooftop RV Air Conditioner Logo

274 people viewed this question

Ask a Question

Usually answered in minutes!

Top Dometic Heating & Cooling Experts

Bill Long

Level 3 Expert

587 Answers

Donni Steen

Level 3 Expert

659 Answers

mike cooper

Level 3 Expert

884 Answers

Are you a Dometic Heating and Cooling Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...