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Old 08-02-2016, 08:59 AM   #31
2011 Berkshire 390BH
Join Date: Nov 2011
Location: NW Ohio
Posts: 33
Originally Posted by tmmar View Post
Running the rerig underway and while stopped is not a problem. Running it on a hill when you are not level is what causes problems. The refrigerator keeps cold by heating the tank in the back of the refrigerator that has liquid ammonia in it and the when heated forms ammonia gas. When the ammonia in gas form goes through the tubing in the back of the refrigerator and cools, the cooling gas absorbs the heat from the refrigerator box. If it is not level, the flame or electric heater may heat the ammonia tank while the ammonia liquid is not near the heating element causing the ammonia to crystallize and clog the tubing in the refrigerator. Once the tubing clogs, the unit will not function.

This is my understanding of how the absorption refrigerator works. If anyone else has a better understanding or explanation, I hope they post it.
To add to this, since there are no compressors/moving parts, absorption refrigerators use gravity for circulation. The tubing follows a zig-zag pattern down the back. Heat causes the vapor/liquid to rise and gravity brings the liquid back down as it does its job. Park on a hill (front or rear high,) the zig-zag tubes start to point up and the liquid can no longer circulate. The liquid starts to pool in the tube bends. The heat source continues to heat the liquid in the boiler sending the ammonia on up. No ammonia is returning. Less ammonia in the boiler. The boiler and its contents become super heated and the anti-corrosion agents start to harden plugging things up. Worse yet, if temperatures get really high, the boiler cracks and your ammonia, etc. leaks out. Either way, you're stuck buying a new cooling unit. I learned this the hard way a number of years ago.

Jeremy & Monica, seven children, plus our spoiled dog
2011 Berkshire 390BH-60
Towing 10 passenger Chevy Express conversion van

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Old 08-02-2016, 11:14 AM   #32
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Join Date: Oct 2013
Location: Argyle Texas
Posts: 88
Hank, No I didn't but that's what you need to do if you want it down right.

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2011, 390bh

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