12 Piping installation
Installation and operation manual
17
FXSN50~112A2VEB
CO
₂
Conveni-Pack: indoor unit
4P602815-1C – 2020.05
a
b
a
Drain plug
b
Phillips screwdriver
To check for water leaks
The procedure differs depending on whether installation of the
system is already completed. When installation of the system is not
yet completed, 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.
▪ Remove the service cover (c).
▪ Connect the power supply (a).
▪ Connect the user interface (b).
▪ Reattach the service cover.
L
N
a
b
c
a
Power supply terminal block
b
User interface terminal block
c
Service cover with wiring diagram
2
Turn ON the power supply.
3
Start fan only operation (see the reference guide or the service
manual of the user interface).
4
Remove the water inlet cover (1 screw).
5
Gradually pour approximately 1 l of water through the water
inlet, and check for leaks.
f
b
e
d
c
a
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
6
Turn OFF the power.
7
Disconnect the electrical wiring.
▪ Remove the service cover.
▪ Disconnect the power supply and user interface.
▪ Reattach the service 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
"When installation of the system
11.3
Relocation
Contact your dealer for removing and reinstalling the total unit.
Moving units requires technical expertise.
12
Piping installation
12.1
Preparing refrigerant piping
12.1.1
Refrigerant piping requirements
NOTICE
Refrigerant R744 requires strict cautions for keeping the
system clean and dry. Foreign materials (including mineral
oils or moisture) should be prevented from getting mixed
into the system.
NOTICE
The piping and other pressure-containing parts shall be
suitable for refrigerant. Use K65 copper-iron alloy tube
system for high-pressure applications with a working
pressure of 120 bar.
▪ Foreign materials inside pipes (including oils for fabrication) must
be ≤30 mg/10 m.
Refrigerant piping diameter
Liquid piping
Gas piping
Ø9.5 mm
Ø12.7 mm
Refrigerant piping material
▪
Piping material:
K65 copper-iron alloy (CuFe2P), maximum
operating pressure = 120 bar
▪
Piping temper grade and thickness:
Outer diameter
(Ø)
Temper grade
Thickness (t)
(a)
9.5 mm (3/8")
R420
(drawn)
≥0.65 mm
t
Ø
12.7 mm (1/2")
≥0.85 mm
(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.
12.1.2
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
