Connecting The Refrigerant Piping; About Connecting The Refrigerant Piping; Precautions When Connecting The Refrigerant Piping; Guidelines When Connecting The Refrigerant Piping - Daikin FCAHG71FVEB Installer And User Reference Manual

a Plastic watering can
b Service drain outlet (with rubber plug). Use this outlet to
drain water from the drain pan.
c Drain pump location
d Drain pipe connection
e Drain pipe
5 Turn OFF the power.
6 Disconnect the electrical wiring.
▪ Remove the switch box cover.
▪ Disconnect the power supply and earth.
▪ Disconnect the user interface.
▪ Reattach the switch box cover.
When electrical wiring is finished already
1 Start cooling operation (see
page 18).
2 Gradually put 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 outdoor unit
▪ Connecting the refrigerant piping to the indoor unit
▪ Installing oil traps
▪ Insulating the refrigerant piping
▪ Keeping in mind the guidelines for:
▪ Pipe bending
▪ Flaring pipe ends
▪ Brazing
▪ 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
FCAHG71~140FVEB
Split system air conditioners
4P429475-1 – 2015.12
e
d
c
b
a
"8.4 To perform a test run" on
"When electrical
page 12).
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 when adding refrigerant.
▪ Only use installation tools (e.g. manifold gauge set) that
are exclusively used for R32 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 two 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
6 Installation
Protection method
Pinch the pipe
Pinch or tape the pipe
Installer and user reference guide
13