Bottle Gas Specialist For Over 20 Years

Nitrogen for Air Conditioning

Oxygen-Free Nitrogen (OFN) for HVAC and refrigeration pipework purging — the spec used by every UK air-con installer for flushing copper lines before brazing and leak-testing sealed split systems. Our range covers 2L, 9L, 20L and 50L refillable cylinders at 137-bar and 200-bar working pressure, plus 9-cylinder and 16-cylinder food-grade OFN manifold packs for installers running multi-bay workshops or refrigeration plants.

All cylinders are RENT FREE — buy the bottle once, refill at our standard rate. The 300-bar single-stage twin-gauge nitrogen regulator (10 LPM flow) sits in the same range for clean step-down to your line pressure. For sizing advice on manifold packs see Nitrogen MCP.

What Nitrogen for Air Conditioning Is Used For

  • Pipe-line purging before brazing — flushing copper refrigerant lines with OFN to prevent oxide scale forming inside the pipe during brazing, which would otherwise contaminate the refrigerant circuit
  • Pressure leak-testing sealed systems — pressurising newly-installed split systems to 30-40 bar (or higher per spec) to confirm joint integrity before charging with refrigerant
  • Refrigerant recovery prep — purging recovery lines between jobs to prevent cross-contamination
  • Pipework modification on live plant — purging during HVAC retrofit work to maintain F-Gas compliance
  • Vacuum-pump assist — some installers use a small N2 cylinder to break vacuum before disconnect

Cylinder Size Quick Guide

  • 2L / 9L — mobile installers, single split-system jobs in the van
  • 20L — workshop or multi-job day, balanced weight vs capacity
  • 50L — workshop standard, multi-bay or commercial refrigeration installs
  • 9 or 16-cylinder MCP — refrigeration plant, large HVAC contractors

F-Gas Compliance and OFN Spec

All Oxygen-Free Nitrogen in our range is food-grade purity (BS 4366 / EIGA equivalent), which exceeds typical HVAC purging requirements. Cylinders ship with a current GA certificate where required for site documentation.

Order or Get a Quote

Call 01843 220 596 or email sales@adamsgas.co.uk. UK-wide delivery — installer-trade discounts available on volume orders.