Posted by Joe (Wa) on June 05, 2010 at 01:50:38 from (66.248.34.220):
In Reply to: RV REFRIGRATOR posted by wilson on June 04, 2010 at 19:10:27:
The absorption refrigerator mixture consists of ammonia (refrigerant), water (circulation accelerator & ammonia coolant), hydrogen (absorbent), & sodium chromate (acid neutralizer).
When the unit is setup for a period the water & ammonia separate in the absorbent tank and other minor areas in the system. They have to be mixed in order for the water to circulate the ammonia. Fairly level position is important in stationery operation as gravity is part of the circulation process.
Turning upside down drains the ammonia & water to the evaporator through the system resulting in some mixing. Turning back upright helps mix in the other direction. Allow time for the mixture to drain back to the absorbent tank before heating.
Small RV refrig requires about 6 hrs per position. Longer than that, the drain is completed and mixture begins separating again. When heat is applied, for about 10 mins listen for liquid movement or evidence of cooling at the expansion point in the evaporator. If none, shutdown the heat. Sometimes takes a couple of turnover cycles but often other problems involved. When circulation starts, mixing snowballs and and it will be up to normal during the first temp pulldown.
Make sure the heat path (chimney) is unobstructed for good draft elect & gas. Gas burner adjustment/cleaning may be needed. Prove out on electric first.
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