− 45 −
Roughness
Warp
Obliquity
A
Die
Pipe
• Tightening torque of flare pipe connections
CAUTION
•
KEEP IMPORTANT 4 POINTS FOR PIPING WORK
(1) Take away dust and moisture (Inside of the
connecting pipes.)
(2) Tight connection (between pipes and unit)
(3) Evacuate the air in the connecting pipes using
VACUUM PUMP.
(4) Check gas leak (connected points)
Flare nutHalf union
Externally
threaded side
Internally
threaded side
Flare at indoor unit side
Flare at outdoor unit side
Mark line
Outer dia.
Tightening torque
of copper pipe
∅6.35 16 to 18 (1.6 to 1.8 kgf·m)
∅9.52 30 to 42 (3.0 to 4.2 kgf·m)
∅12.70 50 to 62 (5.0 to 6.2 kgf·m)
90°
Outer dia.
A
of copper pipe
Rigid Imperial
6.35 0.5 to 1.0 1.0 to 1.5
9.52 0.5 to 1.0 1.0 to 1.5
12.70 0.5 to 1.0 1.5 to 2.0
8-5-2. Refrigerant piping connection
1. Cut the pipe with a pipe cutter.
Fig. 8-5-2
2. Insert a flare nut into the pipe, and flare the pipe.
• Projection margin in flaring : A (Unit : mm)
Fig. 8-5-3
<Tightening connection>
Align the centers of the connecting pipes and tighten
the flare nut as far as possible with your fingers. Then
tighten the nut with a spanner and torque wrench as
shown in the figure.
CAUTION
• Do not apply excess torque.
• Otherwise, the nut may crack depending on the
conditions.
FILE NO. SVM-06001
Use a wrench to secure. Use a torque wrench to tighten.
Fig. 8-5-5
Fig. 8-5-4
Fig. 8-5-6
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