Guidelines When Connecting The Refrigerant Piping; Pipe Bending Guidelines; To Flare The Pipe End - Daikin ARXF20C5V1B Installer's Reference Manual

7.2.3 Guidelines when connecting the refrigerant piping

7.2.4 Pipe bending guidelines

7.2.5 To flare the pipe end

(A)RXF20~42C5V1B
R32 split series
4P519439-10J – 2021.06
WARNING
Connect the refrigerant piping securely before running the compressor. If the
refrigerant piping is NOT connected and the stop valve is open when the compressor
is run, air will be sucked in. This will cause abnormal pressure in the refrigeration
cycle, which may result in equipment damage and even injury.
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.
Flare dimensions
(N•m) (A) (mm)
15~17 8.7~9.1
33~39 12.8~13.2
7 Piping installation
|
Flare shape (mm)
90°
±2
ØA
R=
0.4~0.8
Installer reference guide
33