Pipe Bending Guidelines; To Flare The Pipe End - Daikin CVXM20A2V1B Installer's Reference Manual

7 | Piping installation

7.2.4 Pipe bending guidelines

7.2.5 To flare the pipe end

Installer reference guide
38
▪ ALWAYS use 2 wrenches together when loosening a flare nut.
▪ ALWAYS use a spanner and torque wrench together to tighten the flare nut when
connecting the piping. This to prevent nut cracking and leaks.
a b
c
d
a Torque wrench
b Spanner
c Piping union
d Flare nut
Piping size (mm) Tightening torque
Ø6.4
Ø9.5
Ø12.7
Use a pipe bender for bending. All pipe bends should be as gentle as possible
(bending radius should be 30~40 mm or larger).
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
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 R32
(clutch type)
A 0~0.5 mm
Flare dimensions
(N•m) (A) (mm)
15~17 8.7~9.1
33~39 12.8~13.2
50~60 16.2~16.6
b
Conventional flare tool
Clutch type
(Ridgid-type)
1.0~1.5 mm
Flare shape (mm)
90°
±2
ØA
R=
0.4~0.8
Wing nut type
(Imperial-type)
1.5~2.0 mm
CVXM20+FVXM25~50A2V1B
Split system air conditioners
4P625991-1 – 2020.06