Liquid Line Filter/Drier Diagnosis

How to Diagnose Partially Restricted Filter Driers

Filter driers are designed to remove foreign materials from refrigeration or air conditioning systems. They are notorious for becoming restricted due to moisture, sludge, dirt, or oil that has entered the system from a poor service practice or extreme operating conditions. Of all these issues, it is excessive moisture that causes most filter driers to become restricted. Some sources of moisture in refrigeration and air conditioning systems include:

  • Improper brazing or soldering techniques;
  • Leaky systems;
  • Improper evacuation techniques;
  • Improper handling of hygroscopic system lubricants; and
  • Improper handling of system piping at installation. CONTINUE READING
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