Aftermarket Parts : Filter Line Driers

Filter Line Dryers

1. Purpose and Importance:

   • Used in refrigerant circuits to remove moisture from the refrigerant.
   • Prevents water from creating acid in the refrigerant, which can lead to compressor failure.
   • Essential part, always installed in systems from the manufacturer.

2. Functionality:

   • Contains a desiccant, a hygroscopic substance that absorbs moisture.
   • Similar to silica packets in packaged goods, the desiccant absorbs water to protect the refrigerant circuit.

3. Types of Filter Line Dryers:

   • Liquid Line Dryers: Most common, used in most systems.
     • Single Direction: For traditional AC systems with one-way refrigerant flow.
     • Bi-Flow: For heat pump systems with two-way refrigerant flow. Can replace single direction dryers, but not vice versa.
   • Suction Dryers: Less common, typically replaced only if the compressor has burned out and contaminated the system with acid.

4. Replacement:

   • Should be replaced any time the system is opened, such as when changing the TXV, coil, or compressor.

5. Sizing:

   • Capacity: Measures the drying volume in cubic inches, indicated in the part number.
     • Example: 8.3 cubic inches as part number 083, for 1.5 to 3 ton systems.
     • Example: 16.3 cubic inches as part number 163, for 3.5 to 5 ton systems.
   • Diameter: Refers to the size of the copper stub where the dryer is installed.
     • Liquid Line Dryers: Usually 3/8 inch, but can also be 1/4 inch or 1/2 inch.
     • Suction Dryers: Typically 5/8 inch, 3/4 inch, or 7/8 inch.