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Old 08-13-2015, 11:13 PM   #1
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How do you charge the Dometic Air Conditioners???

I searched but didn't find a direct answer.

Does anyone know how to charge the system? My A/C worked perfectly until last weekend. It wouldn't cool the camper below 80. It used to get to 68 in 95 direct sunlight. The fan ran non-stop but the compressor didn't kick on at all, leading me to believe the system is low on refrigerant. I hate to take it to a dealer for repair and it sit for the rest of the season when charging it may be easier by a trained/licensed person, other than a dealer.
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Old 08-13-2015, 11:36 PM   #2
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Out AC was not blowing cold air. Took it to the dealer and found out there wasn't any freon. They replaced the whole unit. From what they told me there isn't a recharge port. It's a sealed unit. Jerry


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Old 08-13-2015, 11:41 PM   #3
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Agreed. These a/c units are not like your car. They fill them and crimp/seal the tube all in one shot.
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Old 08-14-2015, 05:19 AM   #4
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Yep, replace only.

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Old 08-14-2015, 08:23 AM   #5
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Dometic are assembled in China!

These units are a sealed system meaning there are no charge ports. Charge ports can be installed on them though. The refrigerant type is R-410A and is a blend of refrigerants. If your unit is low meaning it leaked out or could have been under charged from the factory then it has lost part of its blend. The refrigerant charge would need to be totally removed from the unit and evacuated and then a factory charge can be installed. You'll need to leak check the system first before recharging or it will just loose its blend again if it has a leak therefor the leak would need to be repaired. ( It is a blend of HFC-32 and HFC-125 (50/50 wt%) that performs very much like a single component refrigerant and replaced the old R-22 refrigerant. )
On a side not;
There was a lot of Dometic units left the China factory that were under charged!
My front bedroom A/C Dometic 13,500 BTU unit was under charged from the factory. Myself being a refrigeration specialist corrected that issue with my unit by leak checking the system first to make sure there wasn't a leak, then removing the charge and evacuating the system to 500 microns and then installing a factory charge of 18 ounces. The factory charge and refrigerant type are on the unit's data plate on the roof under the A/C cover.

If your A/C unit is older then it could still have R-22 in it which isn't a blended refrigerant and is obsolete, but can still be bought and is expensive.
These units are really just roof top window units and nothing special about them except for there use of an external thermostat for convenience and an accumulator to help prevent liquid slugging. These R-410a units must be charged by the liquid form so as to maintain the blend while charging of the system.


Easily checking the charge of your unit just by the delta temp. difference between the supply air temperature and the return air temperature which should be close to a 20 degree split. Average is 18 to 22 degree split depending on fan speed. These readings should be taken with a clean evaporator and condenser coil and a clean air filter.
If your delta temp. is 15 or less you definitely have a issue. Once the blend is lost efficiency of the 410a drops off dramatically and increasingly with a wider range of lost blend.
These units aren't that expensive and are considered throw away units if much is wrong with them because of parts and labor costs. A new 13,500 BTU Dometic unit is only about $600 and if replacing it I'd go with the 15,000 BTU unit and power consumption of the 15K isn't much more and the hole in the roof for it is the same. Only takes 2 people to put it on the roof and set it in place and connect electrical and stat wiring and tighten the 4 bolts holding it's rubber seal tightly to the roof.


Hope this information helps you a little. I fix mine just because I have the tools and know how and my labor is free to me, other wise it would be more cost effective to just put a new one on the roof and throw the old one away like you would do with a window unit on your house or shed. spending more than a few hundred bucks or more on a old one to fix it wouldn't make sense.


Good luck with it and a cold front is on its way. LOL
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Old 08-14-2015, 01:40 PM   #6
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Lots of things beside being low on freon. Bad start or run capacitor, freeze control sensor, Burned off or loose wire, bad thermostat, bad relay, just to name a few. Not sure they even have a low pressure control to sense low freon. Need to find a person that can check and repair. Most common problem is the start capacitor. The freon doesn't just leak out in a week and quit working unless a line broke and you would know it if that happened. It would have blown oil and freon vapor all over the place.
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Old 08-14-2015, 02:26 PM   #7
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Recharge

Capacitor was mentioned my Lenox home units (2) both went this past summer in the 100 degree heat. I'd check that first. Look it up on U-Tube.
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Old 08-14-2015, 04:14 PM   #8
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You didn't mention how old is is Dometic has 2 year warranty parts and labor and a 3 yr warranty that covers only parts and shipping.
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Old 08-14-2015, 04:27 PM   #9
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This was the OPs question.

How do you charge the Dometic Air Conditioners???
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Old 08-14-2015, 04:31 PM   #10
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I mentioned the warranty because it still may be under warranty!
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