Startup· Advanced 4–6 hr
Line-set flaring, evacuation, and startup for a single-zone mini-split.
Tools
Flaring tool (45°) · Torque wrench · Vacuum pump · Micron gauge · Nitrogen
1
Cut, deburr, flare
Use a rigid tube cutter; deburr with tool facing down. Flare using a clutch-type flaring tool.
2
Torque flare nuts
1/4" ~14 ft-lb, 3/8" ~30 ft-lb, 1/2" ~40 ft-lb — verify with unit's IOM.
3
Pressure test with nitrogen
300–500 psig, hold 15 min minimum.
4
Evacuate
Pull to <500 µm; decay test.
5
Release factory charge
Open liquid then suction service valves fully. Add per meter of line-set beyond factory length.
6
Comm wiring
Match S1/S2/S3 by number, not color. Never crimp comm wire into a wire nut with power conductors.