Cutting or extending the pipe
1.Make sure that you have all the required tools (pipe cutter, reamer, flaring tool and pipe holder).
2.If you want to shorten the pipe, cut it using a pipe cutter, ensuring that the cut edge remains at 90° with the side of the pipe (see below examples of correct and incorrect cut edges).
Pipe cutter
Pipe
Oblique Rough Burr
3. To prevent a gas leak, remove all burrs at the cut edge of the pipe using a reamer.
• Face the pipe down while removing the burrs to make sure that burrs do not get in to the pipe.
4. Put a flare nut slightly into the pipe and modify the flare.
Pipe | Flare |
Outer Diameter (D) | Depth (A) | Flaring Size (B) |
|
|
|
ø6.35 mm | 1.3 mm | 9.0 mm |
ø9.52 mm | 1.8 mm | 13.0 mm |
ø12.70 mm | 2.0 mm | 16.2 mm |
ø15.88 mm | 2.2 mm | 19.3 mm |
ø19.05 mm | 2.2 mm | 22.5 mm |
ø22.23 mm | 2.2 mm | 25.7 mm |
5. Check if you flared the pipe correctly (see examples of incorrectly flared pipes below).
Correct | Inclined | Damaged | Cracked | Uneven |
|
| Surface |
| Thickness |
6.Align the pipes to connect them easily. Tighten the flare nuts first with your hands, and then with a torque wrench, applying the following torque:
Flare nut
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Indoor outlet |
| pipe |
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| ||||
| Connecting pipe | |||||||||
Outer Diameter | Torque (kgf•cm) |
ø6.35 mm | 140~170 |
ø9.52 mm | 250~280 |
ø12.70 mm | 380~420 |
ø15.88 mm | 440~480 |
ø19.05 mm | 990~1210 |
ø22.23 mm | 990~1210 |
• Excessive torque can be cause of gas leakage. In case brazing the pipe, the nitrogen gas must be blown into the
pipe (50 Pa). The joint must be accessible and serviceable.
7. For further details on how to connect to the outdoor unit and purge the air, refer to page 35~37.
• Tighten the flare nut with torque wrench according to specified method.
If the flare nut is
32
