You are bang on Danny and Roger,
At the risk of repeating myself both your talking points are 100% correct.
The difference in the properties of these gases and condensed liquids which boil at a low temp creates the heat pumping qualities and are very explosive...Hydrogen is one of the bad boys in the recipe.
When the refrigerator
is not level a death cycle begins corrupting its well thought out design making its advantages become its undoing...The buffering agent in suspension inside the box is in solution ie. "a soup" this buffering agent gets left behind as a condensed solid in the tubes and does not easily go back into solution because it crystallizes...These crystals may clog the carburetor "the funny tube that is always to one side and vertical to the heat source ie a 12v heater or 120v heating element or a pilot flame source.
This became so annoying in the old design that new units now use a dual carb set up on all manufactures now...The old ones could be salvaged in the short term with the upside down trick but it has a cruel catch...It will get you camping again...but...Even though the carb would/could unplug the buffering agent that made the ammonia behave does not redisolve into the now more corrosive ammonia solution...The crystals migrate to the bottom of the system and sit there inert sometimes trapped by a screen in some models...The ammonia now has become more caustic and more corrosive albeit more dangerous! It begins to attack the metal tubing from the inside out until pin holes develop...Allot of fires occur in older RVs because when these leaks
occur while traveling and on propane
...usually because the 12v element burned out and the owner could not find a replacement...the leak causes a rapid fire to develop, its several times hotter than a campfire or propane
and can have a shockwave faster than sound.
Which brings me to the other correct point this forum makes... You guys are correct about traveling... if in the desert or in urgent need use 12v mode only when on the move...Or dry ice, Or if your like me a gallon plastic bottle of really good frozen water frozen two days before...Or a gallon of frozen milk...Store it in the pre cooled box while on the road...Start your unit up at your camp spot after leveling all three axis points for the box!...level respective to the fridge not the coach!!!!! this is critical
Manufactures are sinners campers...When they install these fridges they oft just throw them in by eyeball...When you level the coach the refrigerator
can be perilously off canter even though the coach is honestly saying level. But the refrigerator is as crooked as bad dice in a cheap vegas casino.
These boxes last years and years...more than the modern freon ones...no moving parts really... when used correctly they last and last. I have a full sized one "looks just like a home unit" in a cabin that is 30 years old, never serviced.
Ignorance kills these and makes me money.