Outer dia. of copper pipe
Ø6.35 mm
Ø9.52 mm
Ø12.7 mm
Tightening torque
14 to 18 (1.4 to 1.8 kgf•m)
33 to 42 (3.3 to 4.2 kgf•m)
50 to 62 (5.0 to 6.2 kgf•m)
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 break.
(Unit : N·m)
• Tightening torque of flare pipe
The pressure of R410A is higher than R22.
(Approx. 1.6 times)
Therefore securely tighten the flare pipes which
connect the outdoor unit and indoor unit with the
specified tightening torque using a torque wrench.
If any flare pipe is incorrectly connected, it may
cause not only a gas leakage but also trouble in
the refrigeration cycle.
Fig. 10-2-3
Fig. 10-2-4
Half union
Flare nut
Externally
threaded side
Internally
threaded side
Use a wrench to secure.
Use a torque wrench to tighten.
Flare at
indoor
unit side
Flare at
outdoor
unit side
Fig. 10-2-5
Connectable capacity class
AAB DE
10, 13
16
(with reducer) (with expander)
16, 22, 24 10, 13
(5 rooms)
(5 rooms)
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