Prepare the tube
The tube must be cut square and fully deburred — hold the deburrer pointing down so shavings do not fall inside. A crooked or crushed cut guarantees a leak.
45° angle and an even finish
The flare standard is 45°; the surface must be smooth, with no cracks or scoring. An eccentric ratcheting flaring tool gives a repeatable result — especially important with R410A and R32 at high pressures.
Torque, not "by feel"
Each diameter has a specified tightening torque — too little leaks, too much cracks the flare. Use a torque wrench and a torque table instead of tightening by feel.
Check
After tightening, leak-test around the flare joints (with nitrogen or after charging). These are the most common refrigerant escape points in split systems.
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