Question about Dometic Rooftop RV Air Conditioner

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I have a 1984 Spartan travel trailer with a duo therm rooftop a/c unit. I need to know if that unit uses r12 or r22 or another type of refrigerant?

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It would use R-22

Posted on Aug 31, 2010


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My duo therm a/c unit is leaking water through my light fixture and not down the side of my trailer. its is blowing cool but not hard

You need to go up top, take the cover off and clean out the drain hole...then it will drain okay again.


Aug 18, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

Duo Therm rooftop A/C turns on then off within 5 minutes


It does sound like it is low on refrigerant gas (R-22). Everything else makes sense. I cannot tell if your's has service ports, but that isn't really an issue. They make bolt on ports just in case they're ever needed, and install them a lot when servicing refrigerators. Any service shop can install them, if necessary.

Best ragards, --W/D--

Aug 21, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

Duo therm 13.5 does not cool

Hello, W/D here.

Some models are equipped with charging ports, some are not. If your's doesn't have them, there is a service port that bolts on to the tubing, and the tubing is then punctured, giving you service ports. This is an easy add-on fix, and not expensive. I believe that all of the rooftop A/Cs are R22 refrigerant, so, yes, special tools and a license are required to assess the unit. If the fan/compressor works without cooling, it should be seen by a qualified technician. They can diagnose any issues, and add refrigerant if required. If you are actually low on refrigerant, you have a leak somewhere. If you system has recharging valves, it can be as simple as a valve stem leaking. As for you question regarding a relay, I doubt that this is the issue, as the fan and compressor are controlled by the relay's action, and sound like they work.

Best regards, W/D

Aug 17, 2009 | Dometic Rooftop RV Air Conditioner

3 Answers

What should refrigerant gauges read when charging walk in freezer?

Depends on what kind of refrigerant its works, if is an old unit probably is charged with R12 or R22 newer ones work with R404 ;for R12 presures should be around 20psi on the low side and 160 on the high side ,for R22 about 60 and 250 and for R404 50 and 350 ;you have to look at the condensing unit tag to find out what type of freon its uses ,or look at the expansion valve at the evaporator coil.

Jul 31, 2009 | Everest Refrigeration Freezers

3 Answers

Duo-therm a/c

We had this issue also and dirt daubers had built a nest on the end of the fan blade

Jul 28, 2008 | Dometic Rooftop RV Air Conditioner

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