How does a 3-way fridge work?

I have a three way fridge (12V, 220V, LPG) that I use for camping. I have observed that it sometimes refuse to cool, even with the heat element well heated (gas or electricity). It seems to have to be level. Sometimes, it refuses to cool, even if level with perfect gas flame or power connection.

Please explain the heat exchange mechanism, so I can understand its temperament?

 

Hello and Welcome Ryno to the Do It Yourself Web Site and my Gas Appliance forum.

The unit must remain level at all times to function correctly. That's because the unit circulates ammonia water to cool.

It's not a complex cooling system. Fact is: this type of refrigeration is almost ideal because it has no compressor and no moving parts to wear out. It's only major flaw was burner fumes entering into the living area. For RV usage this is not the case but was for household refrigerators.

I do not recommend you attempt repairs to this type of system. If the unit will work when level, then all is fine. Anything else needs professional service do to the hazards associated with ammonia and gas.

 

If your fridge is a little temperamental perhaps a dedicated 12v fridge would suit you better? They are a lot more forgiving of un-level surfaces.