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FILE NO. SVM-02001
A
Fig. 8-5-2
Fig. 8-5-3
Die
90°
Roughness
Warp
Obliquity
Pipe
8-5-2. Refrigerant Piping Connection
1. Cut the pipe with a pipe cutter.
2. Insert a flare nut into the pipe, and flare the pipe.
•
Projection margin in flaring : A (Unit : mm)
<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.
Outer dia. of copper pipe
∅
6.35
∅
9.52
∅
12.70
Rigid
1.0 to 1.5
1.0 to 1.5
1.5 to 2.0
0.5 to 1.0
0.5 to 1.0
0.5 to 1.1
Imperial
A
CAUTION
•
Do not apply excess torque.
•
Otherwise, the nut may crack depending on the
conditions.
Outer dia. of copper pipe
Ø6.35 mm
Ø9.52 mm
Ø12.70 mm
•
Tightening torque of flare pipe connections
Use a wrench to secure.
Tightening torque
16 to 18 (1.6 to 1.8 kgf·m)
30 to 42 (3.0 to 4.2 kgf·m)
50 to 62 (5.0 to 6.2 kgf·m)
(Unit : N·m)
Flare at
indoor unit side
Flare at
outdoor unit side
Fig. 8-5-4
For RAS-07 UA
Mark line
85 mm
Fig. 8-5-5
Flare nut
Half union
Use a torque wrench to tighten.
Externally
threaded side
Internally
threaded side
Fig. 8-5-6
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)
