Piping Installation; Preparing Refrigerant Piping; Refrigerant Piping Requirements; Refrigerant Piping Insulation - Daikin FDA125A5VEB Installation And Operation Manual

13 Piping installation

To check for water leaks
The procedure differs depending on whether electrical wiring is
already finished. When electrical wiring is not finished yet, you need
to temporarily connect the user interface and power supply to the
unit.
When installation of the system is not yet completed
1 Temporarily connect electrical wiring.
2 Remove the switch box cover (a).
3 Connect the single-phase power supply (50 Hz, 230 V) to
connections No. 1 and No. 2 on the terminal block for power
supply and earth.
4 Reattach the switch box cover (a).
5 Turn ON the power.
6 Start cooling operation (see
run" [ 4 19]).
7 Gradually pour approximately 1 l of water through the air
discharge outlet, and check for leaks.
f
a
e
a Water inlet
b Portable pump
c Water inlet cover
d Bucket (adding water through water inlet)
e Drain outlet for maintenance
f Refrigerant pipes
8 Turn OFF the power.
9 Disconnect the electrical wiring.
10 Remove the control box cover.
11 Disconnect the power supply and earth.
12 Reattach the control box cover.
When installation of the system is already completed
1 Start cooling operation (see the reference guide or the service
manual of the user interface).
2 Gradually pour approximately 1 l of water through the water
inlet, and check for leaks (see
completed" [ 4 16]).
is not yet
13 Piping installation
13.1

Preparing refrigerant piping

13.1.1

Refrigerant piping requirements

CAUTION
Piping MUST be installed according to instructions given in
installation" [ 4 16]. Only mechanical joints (e.g.
"13 Piping
braze+flare connections) that are compliant with the latest
version of ISO14903 can be used.
Installation and operation manual
16
"15.2 To perform a test
b
c
d
"When installation of the system
NOTICE
The piping and other pressure-containing parts shall be
suitable for refrigerant. Use phosphoric acid deoxidised
seamless copper for refrigerant piping.
▪ Foreign materials inside pipes (including oils for fabrication) must
be ≤30 mg/10 m.
Refrigerant piping diameter
For piping connections of the indoor unit, use the following piping
diameters:
Pipe outer diameter (mm)
Liquid pipe
Ø9.5
Refrigerant piping material
▪ Piping material: phosphoric acid deoxidised seamless copper
▪ Flare connections: Only use annealed material.
▪ Piping temper grade and thickness:
Outer diameter Temper grade
(Ø)
9.5 mm (3/8") Annealed (O)
15.9 mm (5/8") Annealed (O)
(a)
Depending on the applicable legislation and the maximum
working pressure of the unit (see "PS High" on the unit name
plate), larger piping thickness might be required.
13.1.2

Refrigerant piping insulation

▪ Use polyethylene foam as insulation material:
▪ with a heat transfer rate between 0.041 and 0.052 W/mK (0.035
and 0.045 kcal/mh°C)
▪ with a heat resistance of at least 120°C
▪ Insulation thickness
Pipe outer diameter Insulation inner
(Ø ) diameter (Ø
p
9.5 mm (3/8") 10~14 mm
15.9 mm (5/8") 16~20 mm
Ø Ø
i i
Ø Ø
p p
t
If the temperature is higher than 30°C and the humidity is higher
than RH 80%, the thickness of the insulation materials should be at
least 20 mm to prevent condensation on the surface of the
insulation.
13.2

Connecting the refrigerant piping

DANGER: RISK OF BURNING/SCALDING
13.2.1 To connect the refrigerant piping to the
indoor unit
CAUTION
Install the refrigerant piping or components in a position
where they are unlikely to be exposed to any substance
which may corrode components containing refrigerant,
unless the components are constructed of materials that
are inherently resistant to corrosion or are suitably
protected against corrosion.
Gas pipe
Ø15.9
(a)
Thickness (t)
Ø
≥0.8 mm
t
Insulation thickness
) (t)
i
≥13 mm
≥13 mm
FDA125A5VEB
Split system air conditioners
4P494410-1D – 2022.10