The Refrigerant Filter Drier


The purpose of a refrigerant drier is to ensure the refrigerant system stays clean and dry. It removes contaminants including moisture, dirt, acid and solder flux, beads and filings. Whenever the refrigerant system is opened for repair or to replace a component, always replace the filter drier.

Refrigerant Filter DrierWhen replacing the liquid line filter drier, make sure the replacement size equals the size of your system and refrigerant line connections. I t’s possible that in an older system someone might have replaced a drier at some time…and used the wrong size drier.  So it’s a good practice to match the filter drier to the system size.   Also, make sure the replacement drier is compatible with the system refrigerant.  Always place the drier in the refrigerant circuit with the filter’s arrow pointing in the direction of refrigerant flow.  If you are replacing a burned out compressor, install a suction filter designed for high acid content and follow good industry practices.  If you are the technician performing the replacement, make a note detailing the date and the system operating characteristics including the pressure drop across the suction filter. This way you can follow up in a few days to check, remove and or replace the suction filter.


Don JohnsonDon Johnson is the President of Freedom Heating and Cooling in Birmingham, Alabama which offers home owners tools including:
9 Things to Check Before Calling for Service on Your Air Conditioner or Furnace”,  a resource to help home owners save on HVAC problems
The Home Owner’s Guide to Hiring a Heating and Air Conditioning Company“, a quick read on how to guarantee you never suffer by hiring the wrong contractor.
The Ultimate Home Owner’s Guide to Designing an HVAC System , a 59-page eBook covering the 9 steps to building a Complete Home Comfort System.   Contact him at 205-444-4444 or connect on facebook or Google +