Guidelines When Connecting The Refrigerant Piping; Pipe Bending Guidelines; To Flare The Pipe End - Daikin RXP25N5V1B Installer's Reference Manual

7 | Piping installation

7.2.3 Guidelines when connecting the refrigerant piping

7.2.4 Pipe bending guidelines

7.2.5 To flare the pipe end

Installer reference guide
36
Take the following guidelines into account when connecting pipes:
▪ Coat the flare inner surface with ether oil or ester oil when connecting a flare
nut. Tighten 3 or 4 turns by hand, before tightening firmly.
▪ 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
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.
Flare dimensions
(N•m) (A) (mm)
15~17 8.7~9.1
33~39 12.8~13.2
b
Flare shape (mm)
90°
±2
ØA
R=
0.4~0.8
RXP20~35N5V1B+ARXP20~35N5V1B
R32 split series
4P519439-22V – 2022.10