17
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Piping installation
Installer and user reference guide
65
FAA71+100BUV1B
Split system air conditioner
4P654517-1 – 2021.03
a
b
c
d
a
Torque wrench
b
Spanner
c
Piping union
d
Flare nut
Piping size (mm)
Tightening torque
(N•m)
Flare dimensions
(A) (mm)
Flare shape (mm)
Ø9.5
33~39
12.8~13.2
R=
0.4~0.8
±2
45°
90°
±2
ØA
Ø15.9
62~75
19.3~19.7
17.2.4 Pipe bending guidelines
Use a pipe bender for bending. All pipe bends should be as gentle as possible
(bending radius should be 30~40 mm or larger).
17.2.5 To flare the pipe end
CAUTION
▪
Incomplete flaring may cause refrigerant gas leakage.
▪
Do NOT re-use flares. Use new flares to prevent refrigerant gas leakage.
▪
Use flare nuts that are included with the unit. Using different flare nuts may
cause refrigerant gas leakage.
1
Cut the pipe end with a pipe cutter.
2
Remove burrs with the cut surface facing down so that the chips do NOT enter
the pipe.
a
b
a
Cut exactly at right angles.
b
Remove burrs.
3
Remove the flare nut from the stop valve and put the flare nut on the pipe.
4
Flare the pipe. Set exactly at the position as shown in the following figure.
A
Flare tool for R410A or
R32 (clutch type)
Conventional flare tool
Clutch type
(Ridgid-type)
Wing nut type
(Imperial-type)
A
0~0.5 mm
1.0~1.5 mm
1.5~2.0 mm
5
Check that the flaring is properly made.
