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FILE NO. SVM-02005(1)
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
Rigid (Clutch type)
Imperial (wing nut type, conventional tool)
<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.
90°
Roughness
Warp
Obliquity
A
Die
Pipe
• Tightening torque of flare pipe connections
The operating pressure of R-410A is higher than that
of R-22. (Approx. 1.6 times). It is therefore necessary
to firmly tighten the flare pipe connecting sections
(which connect the indoor and outdoor units) up to the
specified tightening torque. Incorrect connections may
cause not only a gas leakage, but also damage to the
refrigerant cycle.
Fig. 8-5-4
For RAS-07UA-ES
Fig. 8-5-5
Fig. 8-5-6
Use a wrench to secure.
(Unit : N·m)
Use a torque wrench to tighten.
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)
Outer dia.
of copper pipe
∅6.35 mm
∅9.52 mm
Tightening torque
16 to 18 (1.6 to 1.8 kgf·m)
33 to 42 (3.3 to 4.2 kgf·m)
Outer dia. R-410A Conventional
of copper pipe tool used tool used
∅6.35 0 to 0.5 1.0 to 1.5
∅9.52 0 to 0.5 1.0 to 1.5
Outer dia.
R-410A
of copper pipe
∅6.35 1.5 to 2.0
∅9.52 1.5 to 2.0
Flare nutHalf union
Externally
threaded side
Internally
threaded side
Flare at
indoor unit side
Flare at
outdoor unit side
Mark line
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