Guidelines When Connecting The Refrigerant Piping; Pipe Bending Guidelines; To Flare The Pipe End - Daikin FCAHG100HVEB Manual

CAUTION
▪ Do NOT use mineral oil on flared part.
▪ NEVER install a drier to this unit to guarantee its
lifetime. The drying material may dissolve and damage
the system.
CAUTION
▪ Do NOT use mineral oil on flared part.
▪ NEVER install a drier to this R32 unit to guarantee its
lifetime. The drying material may dissolve and damage
the system.
NOTICE
Take the following precautions on refrigerant piping into
account:
▪ Avoid anything but the designated refrigerant to get
mixed into the refrigerant cycle (e.g. air).
▪ Only use R32 or R410A when adding refrigerant. Refer
to the outdoor unit specifications for the type of
refrigerant to be used.
▪ Only use installation tools (e.g. manifold gauge set) that
are exclusively used for R32 or R410A installations to
withstand the pressure and to prevent foreign materials
(e.g. mineral oils and moisture) from mixing into the
system.
▪ Install the piping so that the flare is NOT subjected to
mechanical stress.
▪ Protect the piping as described in the following table to
prevent dirt, liquid or dust from entering the piping.
▪ Use caution when passing copper tubes through walls
(see figure below).
Unit Installation period
Outdoor unit >1 month
<1 month
Indoor unit Regardless of the
period
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.
6.3.3 Guidelines when connecting the
refrigerant piping
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.
FCAHG71~140HVEB
Split system air conditioners
4P561449-1A – 2019.09
▪ 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
d
Piping size
6.3.4
Use a pipe bender for bending. All pipe bends should be as gentle
as possible (bending radius should be 30~40 mm or larger).
6.3.5
1 Cut the pipe end with a pipe cutter.
2 Remove burrs with the cut surface facing down so that the
Protection method
Pinch the pipe
Pinch or tape the pipe
3 Remove the flare nut from the stop valve and put the flare nut
4 Flare the pipe. Set exactly at the position as shown in the
A
5 Check that the flaring is properly made.
b
c
a Torque wrench
b Spanner
c Piping union
d Flare nut
Tightening
(mm) torque (N•m) dimensions (A)
Ø9.5 33~39
Ø15.9 63~75

Pipe bending guidelines

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.
chips do NOT enter the pipe.
a b
a Cut exactly at right angles.
b Remove burrs.
on the pipe.
following figure.
A
Flare tool for Conventional flare tool
R410A or R32
Clutch type
(clutch type)
(Ridgid-type)
0~0.5 mm 1.0~1.5 mm
6 Installation
Flare Flare shape
(mm)
(mm)
90°
±2
12.8~13.2
ØA
19.3~19.7
R=
0.4~0.8
Wing nut type
(Imperial-type)
1.5~2.0 mm
Installer and user reference guide
15