Guidelines When Connecting The Refrigerant Piping; Pipe Bending Guidelines; To Flare The Pipe End - Daikin FCAHG71HVEB Installer And User Reference Manual

6 | Installation

6.3.3 Guidelines when connecting the refrigerant piping

6.3.4 Pipe bending guidelines

6.3.5 To flare the pipe end

Installer and user reference guide
36
INFORMATION
Do NOT open the refrigerant stop valve before checking the refrigerant piping. When
you need to charge additional refrigerant it is recommended to open the refrigerant
stop valve after charging.
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
Ø9.5
Ø15.9
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)
33~39 12.8~13.2
62~75 19.3~19.7
Flare shape (mm)
90°
±2
ØA
R=
0.4~0.8
FCAHG71~140HVEB
Split system air conditioners
4P561449-1B – 2021.07