Frequently Asked Questions

• How do I choose the correct TXV for R-22 vs R-410A vs R-32 or R-454B systems?

  Match the valve to the exact refrigerant, tonnage, external equalizer requirement, and connection sizes. Follow coil and OEM guidance.

• Can a TXV be replaced without recovering refrigerant, and what tools are required?

  No. Recover the charge per EPA rules. You’ll need a recovery machine, gauges, vacuum pump, nitrogen, and brazing tools.

• What symptoms indicate a failing or improperly sized TXV?

  Hunting superheat, starved or flooded coil, low suction or high head pressures, poor capacity, icing, or short cycling.

• Are Parker, Danfoss, and ICP TXVs interchangeable across brands or model lines?

  Only when refrigerant, tonnage, connections, and equalization match. Use OEM-recommended parts whenever available.

• How do I set or verify superheat after installing a new TXV?

  Stabilize the system, compare suction saturation to suction line temperature; the difference is superheat. Typical AC targets are about 8-12°F.

• What considerations are there when converting a system to R-454B or R-32 regarding TXV selection?

  Use an A2L-rated TXV with compatible elastomers, replace the filter-drier, and confirm tonnage and distributor orifice.

• Do TXVs come pre-charged with an external equalizer, and how do I match connection sizes?

  The powerhead is factory charged. Most valves are externally equalized; match 1/4" equalizer and suction/liquid connection sizes.

• When should a TXV be replaced versus cleaned or adjusted?

  Clean screens and replace the drier if contaminated. Replace for a leaking powerhead, stuck pin, or persistent hunting.

• Do I need an external or internal equalizer?

  Use external equalization with distributors or significant evaporator pressure drop; most modern coils require external.

• What tonnage TXV do I need?

  Match the evaporator’s nominal tonnage (e.g., 1-5 tons or ~12k-60k BTU). Do not undersize.