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SODIUM CHROMATE In order to cool, an rv refrigerator uses ammonia as a coolant. However, the ammonia is much stronger than typical household ammonia. In fact, ammonia at the concentration required in absorption refrigeration is actually corrosive when heated to it's boiling point. As such, it is necessary to add chemicals to counteract the corrosive nature of the ammonia. Sodium chromate is a yellow powder that is added to the ammonia charge of every cooling unit, whether factory new or a remanufactured unit. It acts as a corrosion inhibitor. It readily dissolves into the liquid ammonia, where it remains as a liquid during normal and proper operation of the cooling unit. However, it will solidify when exposed to high temperatures caused by running a cooling unit out of level. Once the sodium chromate solidifies, it will not turn back to a liquid state. It will remain as a solid inside the cooling unit, eventually lodging itself in the smaller internal perk tubes and liquid lines of the cooling unit. When this happens, your cooling unit will not function properly, if at all.
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