Connecting The Refrigerant Piping; About Connecting The Refrigerant Piping; Precautions When Connecting The Refrigerant Piping; Guidelines When Connecting The Refrigerant Piping - Daikin FFA50A2VEB9 Installer And User Reference Manual

When electrical wiring is finished already
1 Start cooling operation (see
page 20).
2 Gradually pour approximately 1 l of water through the air
discharge outlet, and check for leaks (see
wiring is not finished yet" on
6.3

Connecting the refrigerant piping

6.3.1

About connecting the refrigerant piping

Before connecting the refrigerant piping
Make sure the outdoor and indoor unit are mounted.
Typical workflow
Connecting the refrigerant piping involves:
▪ Connecting the refrigerant piping to the indoor unit
▪ Connecting the refrigerant piping to the outdoor unit
▪ Insulating the refrigerant piping
▪ Keeping in mind the guidelines for:
▪ Pipe bending
▪ Flaring pipe ends
▪ Using the stop valves
6.3.2 Precautions when connecting the
refrigerant piping
INFORMATION
Also read the precautions and requirements in the
following chapters:
▪ General safety precautions
▪ Preparation
DANGER: RISK OF BURNING
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.
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).
FFA25~60A2VEB(9)
Split system air conditioners
4P550955-4 – 2018.08
"8.4 To perform a test run" on
"When electrical
page 14).
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.
▪ 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 Tightening
(mm) torque (N•m)
Ø6.4 15~17
Ø9.5 33~39
Ø12.7 50~60
6.3.4

Pipe bending guidelines

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 Installation
Protection method
Pinch the pipe
Pinch or tape the pipe
Flare Flare shape
dimensions (A) (mm)
(mm)
90° ±2
8.7~9.1
A
12.8~13.2
16.2~16.6
R=0.4~0.8
Installer and user reference guide
15