Online Industrial Training – Garden City Ammonia Program

Properly dehydrating an ammonia refrigeration system after build or maintenance is essential to a water free refrigeration system. After all piping and equipment has been leak tested and proven tight one could would need to remove the residual pressure. If you desired to remove the water taking it to a “deep vacuum” is essential.

Connect a vacuum pump or a pump out compressor until 5,000 microns is achieved. At the beginning, pressure and micron count will drop quite quickly, however the more water in the system the reduction will gradually slow down. Any low spots may have liquid water settled and safely applying heat will help it boil away.

Once 5,000 microns is achieved and can be held relatively constant without any increase with the pump/compressor off, the system has been dehydrated and it is now ready bringing over the remaining ammonia or taking its first charge.