Filter Drier/In-line Filter Replacement

Parent topic: Refrigeration Maintenance

Removal

  1. Recover the refrigerant charge from the unit.

  2. Place the new filter drier near the unit for immediate installation.

  3. “Crack” both the inlet and outlet nuts on the filter drier. Use two wrenches on flare fittings to prevent line damage.

  4. Separate the filter drier line mountings.

  5. Remove the filter bracket clamping nuts and bolts.

  6. Remove the old filter drier from the unit.

Installation

  1. Remove the sealing caps from the new filter drier.

  2. Apply clean compressor oil to filter drier threads.

  3. Install new filter drier in unit. Finger tighten mounting nuts.

    Note To prevent incorrect installation of the dehydrator, the inlet and outlet fittings are different sizes.

  4. Reinstall clamping brackets, nut, and bolts. Tighten the bolts.

  5. Tighten filter drier inlet and outlet nuts.

    Note Always hold the body of the dehydrator (or liquid filter) near the flange fittings. This will prevent twisting the tubing when the nuts are being loosened or tightened.

  6. Pressurize the refrigeration system and check for leaks (Refer to Leak Testing Refrigeration System). Repair leaks if required.

  7. Recover the refrigerant used for the leak test if no leaks were found.

  8. Evacuate the system (Refer to Evacuation and Cleanup of Refrigeration System).

  9. Recharge the unit with R-404A/R-452A (Refer to Charging System with Refrigerant).

  10. Perform a controller pretrip test to verify system operation.

Filter Drier