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The two most frequent questions service technicians ask about dehydration are...
Last Updated: 12/08/2016
  1. What size vacuum pump should be used to perform a good refrigeration/air conditioning system dehydration job?
  2. How long should the pump be left on the system to assure removal of all moisture?

To give specific answers to these questions, you need to know the cubic capacity of the system to be dehydrated; amount of moisture both visible and invisible present in the system; I.D. and length of the connecting line as well as the restrictions within the system itself (cap tubes, valves, etc.) which might cause back pressures.

Rather than supplying fast, pat answers to these important questions and then trying to justify them, let's start by covering the basic fundamentals of dehydrating a refrigerant system.


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