Question about Dometic Rooftop RV Air Conditioner

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Ac freezes up

Repair line leak vac and gas up 68 psi. unit was cooling good. left running for about 45 min and unit was not cooling pressure was 75 to 120 psi

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Exactly how much refrigerant did you charge into the system when you recharged it? If the suction pressure is varying that much you most likely over charged the system and got a liquid flood back which took out the compressor valves.

Posted on Jul 07, 2008

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Why does the compressor run only for about 5 minutes then shut off, leaving the fan still running?


It seems that you have a system short. You have to try resetting the system. First turn the breaker off for the condenser and wait about 20 seconds. After you turn it back on the system should reset.

If this doesn't help I would recommend calling a ac service company.


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Room temp 78 degrees with unit setting at 68 degrees. The unit is running (i.e. compressor) but unit not pumping out cold air. To be specific the unit is pushing out cool air just not cold with such a...


Sounds like it could be low on freon I believe these units have about 1.5 pounds of freon in them and are critical in not undercharging or overcharging them if it is a freon 410 ac unit the pressures should be about 135 and both lines cold if is low on freon a service tec will need to be called to try to repair the leak if possiable

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Unit is freezing up


what type of gas?
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How do you tell if a goodman ck36-1b has proper level of freon.Lets say it is 75 degrees outside and I added to where the low side reads around 30 and the high side is around 120-130.(orignal problem was...


The correct way is to evacuate the system,pull a vacuum then charge with a refrigerant scale.
In lieu of that you can charge by pressure and get close.
Normal operating pressure would be 68 psi on the suction side and about 225/275 on the high side.
You do have to calculate the outdoor and indoor ambient temperature.
At your 75 degree outdoor air a low side pressure of 60 psi or higher would be acceptable.
Your 30/130 is too low.
Add more refrigerant.

Make certain the indoor coil is clean and the fan motor is working correctly.
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Air not cold enough to cool house


Make sure the outside fan is running. Also check the high side pressure, I assume the 70# is the low side pressure, so you can tell what the compressor is doing. If the fan and compressor are both working, make sure there is good airflow through outdoor coil and check that it is clean. Let me know what you find.

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Water cooled packaged system has a psi reading of 75 when the compressor is off. when it kicks on the psi goes to 115. On another unit the reading is 65psi with the compressor off and 105psi when it kicks...


The gauge could be slightly out of calibration. With the compressor off, and both units exposed to nearly the same temperature of air & water, the pressures will be virtually the same, even if the one system has slightly more refrigerant than the other. Again, this is assuming the units have the same type of refrigerant and are exposed to the same air and water temps.
I advise leaving the refrigerant alone (especially if you are not EPA certified) and start with ensuring you have a clean air filter, clean coils, proper air flowing across the air coil and proper water flow flowing across the water coil.

I'm going to share a trick.........a refrigerant tank with either a slight amount of liquid or a lot of liquid, can be identified by comparing the saturated liquid temperature (using a Pressure/Temperature chart) and the ambient temperature of the air which the tank is stored. Your ac, though it has lines, coils, etc, is a sealed system with saturated liquid and gas. That said, as long as they are exposed to the same ambient temperatures, the pressures (without the compressor running ie: OFF) will be equal. One of the two gauges is off 10psig.

Without being onsite with toolbox in hand, I hope this information is very helpful to you moving forward. :-)

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1 Answer

Indoor coils freezing up


You have a low refrigerant (leak) problem or poor airflow due to dirty coils or bad fan motor.
Maybe a combination of all 3.
Check the coils for dirt and lint. Check the fan motor blower wheel for lint on the blades. Check the condensing unit refrrigerant operating pressure. Low side for R22 should be approximately 68 psi, R410 pressure should be approximately 135 psi.

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Split ac not cooling the room.ac temparature remains at 27 degree after ac runs for about 4 hours.please solve this


Gas has leaked from inner or outer unit kindly get it checked by service men they will find the leak and charge the gas again normally after some time it gets rusty inside as water is involved and got leak

no problem get it repaired not expensive

pls rate me well !
Regards

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ok lets see how i can help you. If the units low on gas, suspect a refrigerant leak!! 2nd, what refrigerant it's using? I can't tell you operating pressures if you don't know the refrigerant. (usually the label on the indoor unit right side says refrigerant charge and type.) 3rd desired temperature for cooling is about 68-72 F that's about 20-22 Celsius.

id keep it on 21 C

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