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Step 2.9 Shortening or extending the
refrigerant pipes (assembly pipe)
90°
Oblique
D
Pipe
Flare
Outer diameter (D)
ø 6.35
ø 9.52
ø 12.70
ø 15.88
Indoor outlet pipe
Outer diameter (mm) Torque (N•m)
ø 6.35
ø 9.52
ø 12.70
ø 15.88
18 English
Pipe cutter
Pipe
Rough
Burr
90°±2°
A
45°±2°
L
R 0.4 to 0.8
D
(Unit: mm)
Depth (A)
Flare dimension (L)
1.3
8.7 to 9.1
1.8
12.8 to 13.2
2.0
16.2 to 16.6
2.2
19.3 to 19.7
Flare nut
Connecting pipe
Torque (kgf•cm)
14 to 18
140 to 180
34 to 42
350 to 430
49 to 61
500 to 620
68 to 82
690 to 830
CAUTION
• Keep the piping length at a minimum to minimize
the additional refrigerant charge due to piping
extension. (Maximum allowable piping length:
15 m)
• When connecting the pipes, make sure that
surrounding objects do not interfere with or
contact them to prevent refrigerant leakage due
to physical damage.
• Make sure that the spaces where the refrigerant
pipes are installed comply with national gas
regulations.
• Be sure to perform works such as additional
refrigerant charging and pipe welding under the
conditions of good ventilation.
• Be sure to perform welding and piping works for
mechanical connections under the conditions that
the refrigerant does not circulate.
• When reconnecting the pipes, make sure
to perform flared-jointing newly to prevent
refrigerant leakage.
• When working on the refrigerant pipes and the
flexible refrigerant connectors, be careful that
they are not damaged physically by surrounding
objects.
• If you need a pipe longer than specified in piping
codes and standards, you must add refrigerant to
the pipe. Otherwise, the indoor unit may freeze.
• While removing burrs, put the pipe face down to
make sure that the burrs do not get in to the pipe.
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