14
EN
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)
• Tightening torque for connection of flare pipe
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.
CAUTION
• Do not apply excess torque. Otherwise, the nut may crack depending on the conditions.
Outer diameter 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)
Flare at indoor
unit side
Flare at outdoor
unit side
Flare nutHalf union
Externally
threaded side
Internally
threaded side
Use a wrench to secure. Use a torque wrench to tighten.
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