21
(B) Joint Selection
The minimum thickness of joint and are nut dimension are selected from the
table below:
Minimum Thickness of Joint Flare Nut Dimension B
Unit: mm Unit: mm
Diameter(Φd) R410A Diameter(Φd) R410A
6.35 0.5 6.35 17
9.52 0.6 9.52 22
12.7 0.7 12.7 26
15.88 0.8 15.88 29
19.05 0.8 19.05 36
NOTE:
Do not use a thin joint other than the ones shown in the table above.
(C) Verify that there are no scratches, metal particles, gaps, or deformations at the ared end before
making connections to the system.
(D) Apply refrigerant oil (eld-supplied) slightly on the are surface of the pipe and are nut before
performing aring work. Tighten the are nut with the specied torque settings using two wrenches.
Perform aring work to the liquid piping side before treating the gas piping side. Verify that no gas
leakage has occurred after completing aring work.
(E) Be sure to use two wrenches as shown.
Flare Nut
pply Refrigerant Oil
Do not apply
refrigerant oil
to exterior flared
surfaces.
Flare Nut
Do not apply the two wrenches work here.
Refrigerant leakage shall occur
Use two wrenches as shown Tightening Work for Stop Valve
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