Filter Driers and System Cleanup w/ Copeland

Jim Fultz and Jim Hagl from Copeland join the podcast to talk about filter driers and system cleanup. Filter driers come in many types and sizes; they typically go on the liquid line (bi-flow filter driers are used on heat pumps), but suction line filter driers also exist.

Copeland’s liquid line filter drier models include the EK (premium), BSL (smaller diameter), BOK (with HH desiccant to assist with burnout cleanup), and CU (copper spun). Bi-flow filter driers in Copeland’s lineup include the BFK and BSB categories. These liquid line filter driers protect the metering device and should typically be installed as close to the metering device as possible (with some exceptions for heat pump startups in heating mode). These filter driers typically need to be replaced anytime the system is opened for service, the pressure drop across the drier exceeds 3 PSI, or the system is wet.

Suction line filter driers in Copeland’s lineup include the ASD, SFD, and CSFD models, all of which come in different shapes and sizes for varying applications. The ASK suction line filter drier has activated carbon to assist with burnout cleanup. When used to assist with contamination cleanup, suction line filter driers must be taken out of the system within a few days.

Jim F., Jim H., and Bryan also discuss:

  • Copeland and Emerson brand realignment
  • Filtration data
  • Myths about smaller-diameter filter driers
  • Copper-spun drier uses and applications
  • Ideal vs. accessible suction filter drier placement
  • Desiccant considerations
  • Filter drier selection best practices
  • Moisture indicators
  • Restricted filter driers
  • Filter drier sizing and system charge
  • Bi-flow driers in straight-cool systems
  • Dealing with factory-installed filter driers
  • Product names and suffixes
  • Burnouts and oil
  • Flowing nitrogen while brazing
  • Additives and flushes

Check out Copeland’s filter driers at

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