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6
REFRIGERANT PIPING
Tightening connection
• Do not apply excessive torque. Otherwise, the nut may crack depending on the conditions.
Outer diam. of copper pipe
6.4 mm (diam.)
9.5 mm (diam.)
12.7 mm (diam.)
15.9 mm (diam.)
• Tightening torque of flare pipe connections
Pressure of R410A is higher than that of R22. (Approx. 1.6 times) Therefore, using a torque wrench, tighten the
flare pipe connecting sections which connect the indoor and outdoor units of the specified tightening torque.
Incorrect connections may cause not only a gas leak, but also a trouble of the refrigeration cycle.
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.
EN
Toshiba 1074007701(01EN)_P01-10
Half union
Externally
threaded side
Use a wrench to secure.
3
10
CAUTION
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)
68 to 82 (6.8 to 8.2 kgf•m)
Flare at indoor unit side
Flare at outdoor unit side
Flare nut
Internally
threaded side
Use a torque wrench to tighten.
9
7/16/04, 13:30
TOSHIBA RAV-SM561KRT-E (EN) 1074007701
(Unit : N•m)
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