I went to turn down the A/C today in my camper and it shut down and we smelled something burning. Now nothing we turn the knob on.
Since you have a knob, I am assuming that this unit has manual controls that are mounted directly below the air conditioner on a ceiling pack. If you smell burned wiring, remove the inside shroud to access the 120VAC connections in the unit. Check these connections for OK, if they look burnt, cut them back and reattach them (be sure to turn the breaker off first). Try the AC again.
If those connections look fine, then remove the upper cover from the unit. Access the capacitors on the side of the unit and check them for ok. If any one of them looks burnt, replace it. These two places are usually the only place that you will get a burned plastic smell.
Hope this helps,
Jeff
SOURCE: how to add freon to my 57915-331 duo therm camper
Normally that would be a closed/sealed system, not rechargeable, from the factory. Don't know what valve your seeing, unless someone has retrofitted it with valves for recharging prior to you purchasing it. I will say that quite often the reason for poor, or less cooling, than when new, is often due to simply needing a good cleaning of evaporator and condenser coils and fins. Has that been done lately?
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