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Indoor Unit Installation
NOTE
• The pipe will be insulated and fixed permanently into
position after finishing the installation and the gas leak
test. For further details. see Step 3.1 Performing the
gas leak tests on page 40.
CAUTION
• Tighten the flare nut with a torque wrench according
to specified method. If the flare nut is over-tightened,
the flare may break and cause refrigerant gas leakage.
• Do not box in or cover the pipe connection. All
refrigerant pipe connection must be easily accessible
and serviceable.
Step 2.7 Shortening or extending the
refrigerant pipes (assembly pipe)
90°
D
Pipe
Flare
Outer diameter (D)
ø 6.35
ø 9.52
ø 12.70
ø 15.88
38 English
Pipe cutter
Pipe
Oblique
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
Indoor outlet pipe
Outer diameter (mm) Torque (N•m)
ø 6.35
14 to 18
ø 9.52
34 to 42
ø 12.70
49 to 61
ø 15.88
68 to 82
CAUTION
• 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.
Liquid service port
<High pressure>
Correct
Inclined
Cracked
<Flare nut>
Flare nut
Connecting pipe
(Unit: mm)
Torque (kgf•cm)
140 to 180
350 to 430
500 to 620
690 to 830
Gas service port
<Low pressure>
Uneven
Damaged
thickness
surface
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