Tightening of Connecting Part
| (Unit: N•m) |
|
|
Outer dia. of copper pipe | Tightening torque |
|
|
6.4 mm (diam.) | 14 to 18 (1.4 to 1.8 kgf•m) |
|
|
9.5 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
•Align the centers of the connecting pipes and tighten the flare nut strong as far as possible with your fingers.
Then fix the nut with a spanner and tighten it with torque wrench as shown in the figure.
REQUIREMENT
1.Do not put the spanner on the cap. The valve may be broken.
2.If applying excessive torque, the nut may be broken according to some installation conditions.
•After the installation work, be sure to check gas leak of connecting part of the pipes with nitrogen.
Cover
Half union or packed valve | Flare nut | |
Externally |
| Internally |
threaded side |
| threaded side |
Fix with spanner. | Tighten with torque wrench. | |
•As shown in the figure, be sure to use a double spanner to loosen or tighten the flare nut of the valve at gas side. If using a single spanner, the nut cannot be tightened with necessary tightening torque.
On the contrary, use a single spanner to loosen or tighten the flare nut of the valve at liquid side.
Cover
Cap
Piping valve
Loosened | Tightened |
| Flare nut |
Valve at gas side
•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/outdoor units at the speci- fied tightening torque. Incomplete connections may cause not only a gas leak, but also a trouble of the refrigeration cycle.
Do not apply refrigerating machine oil to the flared surface.
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