Frequently Asked Questions

• What brazing gases are suitable for HVAC copper line brazing?

  Use oxy-acetylene or air-acetylene for heat, and dry nitrogen as the inert purge gas inside the tubing. Never purge with oxygen.

• When should I use a line flush before commissioning a new system?

  Flush when reusing line sets, after compressor burnouts, when oil or acid contamination is suspected, or any time debris may be present. Allow full evaporation before evacuation.

• Are these brazing gases compatible with both ACR copper and refrigeration applications?

  Yes. Purge gases and heat gases work with ACR copper and refrigeration piping. Verify your regulator, hose, and fittings match the gas and cylinder type.

• What safety precautions and PPE are required when using brazing gases or flush solvents?

  Wear eye/face protection, gloves, and flame-resistant clothing, ventilate the area, keep ignition sources controlled, and follow each product’s SDS and local codes.

• How much line flush is needed for a typical residential line set?

  Commonly 1-2 cans (about 16-32 oz) for 3/8 to 3/4 inch lines up to around 50 feet. Heavily contaminated systems may require more-follow the label.

• Can a DIY homeowner use line flush products, or is a licensed contractor recommended?

  DIY is possible for basic prep, but brazing and working with pressurized gases are hot work tasks. Many jurisdictions require a licensed professional.

• What is the difference between nitrogen purging and using a line flush?

  Nitrogen purging prevents oxidation inside the tube while brazing; line flush dissolves and removes oils, acids, and debris. They’re complementary steps.

• How should empty cylinders and used flush solvents be disposed of according to regulations?

  Follow container labels and local rules. Return empties to suppliers or approved recycling, and treat used solvent as hazardous waste if required.

• Can I purge with CO2 or argon instead of nitrogen?

  Dry nitrogen is preferred for cost and inertness. Argon can work but is pricier; avoid CO2 due to potential moisture reactions forming carbonic acid.

• How do I store cylinders and flush products?

  Store upright, secured from tipping, in a cool, dry, ventilated area away from heat or sparks. Keep caps on cylinders and containers tightly closed.