AIB2C Bi‑Flow Filter Drier for Heat Pump 3/8in Sweat Liquid Line SFK-083S — Bidirectional, 680 psig

The AIB2C Bi Flow Filter Drier SFK-083S is a 3/8" sweat liquid-line filter drier designed to protect heat pump and air-conditioning refrigerant circuits by removing moisture and particulate in both flow directions.

Built as an economical aftermarket component, this filter drier fits 3/8" liquid lines on heat pumps, air conditioners and refrigeration equipment. Compatible with a wide range of refrigerants including R410A, R22, R134a and others, it provides bidirectional service and a maximum working pressure of 680 psig (4.70 MPa). Use it when replacing a failed or contaminated drier or when retrofitting systems that require reliable moisture and acid control.

How does this filter drier protect my HVAC system?

The drier traps moisture, acid, and solid particles that can damage compressors, valves and expansion devices. Its desiccant core absorbs water while internal screens capture debris, helping prevent freezing, corrosion and reduced performance.

• Desiccant media removes moisture from refrigerant lines.
• Internal filtration captures particulate and metal shavings.
• Bidirectional design works for heat pump reversing cycles.
• Rated for common refrigerants used in residential and light commercial systems.

Which refrigerants and pressures is the SFK-083S compatible with?

The SFK-083S supports a broad selection of refrigerants, making it suitable for many service scenarios and retrofits. Check system specifications to confirm refrigerant match and ensure operating pressure does not exceed the drier's rating.

• Compatible refrigerants: R410A, R12, R22, R134a, R404A, R407, R502, R507.
• Maximum working pressure: 680 psig (4.70 MPa).
• 3/8" SAE sweat connection fits standard liquid lines with solder joints.
• Bi directional flow for heat pump reversing cycles.

How do I install the 3/8" sweat liquid line filter drier?

Installation requires basic HVAC soldering skills and standard safety precautions. Cut the liquid line at the recommended service location, flare or sweat the drier in place per manufacturer practices, purge the system properly and vacuum before recharge.

• Locate on the liquid line close to the condenser or service port.
• Use proper brazing/sweat technique to avoid overheating the desiccant core.
• Purge with nitrogen during brazing; evacuate and test for leaks after install.
• Replace any time the system is opened or suspected of contamination.

What are the key performance features and limitations?

The SFK-083S offers cost-effective contamination control and works in both flow directions, but it is a service part, not a permanent cure for severe system contamination. For heavily acidified or highly contaminated systems, additional service work or multiple driers may be required.

• Economical protection for air conditioning and refrigeration applications.
• Bidirectional operation for heat pump systems.
• Not a substitute for comprehensive system cleaning after major failures.
• Intended as an aftermarket replacement part for 3/8" liquid lines.

Who is this for? HVAC technicians, service contractors and knowledgeable DIYers working on residential or light-commercial heat pumps, air conditioners and refrigeration equipment will find the AIB2C SFK-083S useful. It’s aimed at situations where a compact, 3/8" sweat, bidirectional filter drier is needed to restore moisture and particulate control in systems running supported refrigerants and operating below the 680 psig rating.