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CAUTION
• Do not apply excess torque. Otherwise, the nut
may crack depending on the conditions.
<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.
(Unit : N•m)
Outer diam. of copper pipe Tightening torque
6.35 mm (diam.) 14 to 18 (1.4 to 1.8 kgf•m)
9.52 mm (diam.) 33 to 42 (3.3 to 4.2 kgf•m)
12.7 mm (diam.) 50 to 62 (5.0 to 6.2 kgf•m)
15.9 mm (diam.) 63 to 77 (6.3 to 7.7 kgf•m)
Flare at
indoor unit side
Flare at
outdoor unit side
Flare nutHalf union
Use a wrench to secure.
Use a torque wrench to tighten.
Externally
threaded side
9-7-3. Pipe Shield for Flare Nut Connection
Joints in liquid and gas pipes of the indoor unit should
be insulated with an attached Pipe shield $.
<How to install the pipe shield>
1. Cut the Pipe shield $ to appropriate length.
2. Set the Pipe shield $.
3. In case of a ceiling installation, orient the slit at the
top of the pipe.
4. Fix the Pipe shield $ with vinyl tape.
Fig. 9-7-5
$$
$$
$ Pipe shield
Vinyl tape
Slit
Internally
threaded side
• Tightening torque of flare pipe connections
Pressure of R410A becomes higher than that of
R22. (Approx. 1.6 times) Therefore, using a torque
wrench, tighten firmly 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 a trouble of the refrigeration cycle
or compressor damage.
Fig. 9-7-3
Fig. 9-7-4