I have two Domtec air conditioners installed on my 1998 A class. The front one was not operating as well as it normally did so was going to open it up and see what was going on. It then started to humm with the thermostat set off. Opened it up and the humm was from the compressor. It was warm yet cool on the high pressure side. When I put thermostat to cool, fan ran and everything seems reasonable (cool but not cold air coming out of ducts).
I do open up both annually and clean ut the coils.
I looked for a fitting to add gas and didn't notice one. My guess is it is low on freon but am not sure where to add. Any suggestions???
These are sealed units and do not have "fittings" to add freon. There are people out there that will add a shrader valve and add freon but it will leak out again. If your compresson runs when the t-stat is off, your relay in the ceiling is stuck. You will need to replace the circut board in the ceiling box.
Larry
1994 Ford F250/7.5L/410 gears
2001 Keystone Sprinter 276RLS 14' slide
I have a Duo-Therm model 59516 (15,000 BTU) in a 1999 fifth wheel camper. Last summer the air conditioner stopped blowing cool air. The fan and compressor would run but no cooling. I took the camper to a local HVAC service company. There was a crack in the high side line and the Freon had leaked out. For $179 the repairman cut out the cracked portion and installed two Schrader valves for charging and checking and he evacuated and charged the system. The unit works great now.
As the other person said, They are shipped sealed, no fittings. I have added a fitting to one similar device (A de-humidifier) and last I checked it was still working well (This was perhaps 15 years ago I added the fitting and 2 years ago I last checked, put in central air since) So I know they can be added. Though I did it myself, I seriously suggest professional help for those wishing to do this. Many reasons, one being I'd hate to have you put the wrong stuff in.
Second, the compressor running with the unit off is not a low-charge condition far as I know (I can think of one way it might be but suspect they don't have that feature installed on a Dometic A/C. A Lippert computer room AC that cost dang near as much as a Class C and is designed to work when the outside temps are below zero yes, a Dometic R/V unit no (My home unit no) It is a control board failure and sometimes all that is needed is a "Reset" which you did when you ran the unit.
However if it continues to happen.. See "Professional help"
or rater SEEK professional help
I know this sounds strange, but the first symptom of low coolant on most A/C's is icing of the evaporator. However in an A/C that sits and sits, it may get so low (Should it start to leak) that no cooling at all will happen.
So if it's cooling, and not icing up, you likely have a good charge. But again, if you are concerned... See a professional. I'm not a professional.. Just someone who's seen it too many times to forget it.
And note: Icing, by itself, is not diagnostic, may be other causes as well
Nothin adds excitment like something that is none of your business John is Near Kenwood TS-2000 housed in a 2005 Damon Intruder 377
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