Repair· Advanced 2–4 hr
Complete refrigerant service after finding a leak.
Tools
Recovery machine · Recovery cylinder · Electronic leak detector · Vacuum pump · Micron gauge · Refrigerant scale · Brazing kit · Nitrogen
1
Recover to per-EPA levels
Recover to 0 psig on high-pressure systems.
SafetyEPA 608 required. Never vent.
2
Locate leak
Nitrogen pressure test at 150 psig with soap or electronic detector.
3
Repair
Braze with nitrogen purge to prevent scale.
4
Change drier
Always install a fresh liquid-line filter-drier after opening.
5
Evacuate
Pull to <500 µm with core-removal tools, decay test <1000 µm in 10 min.
6
Weigh in charge
Charge by weight per data plate; adjust with superheat/subcool at rated conditions.