Daikin FXSN50A2VEB [20/24] Commissioning
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Daikin FXSN50A2VEB [20/24] Commissioning

Daikin FXSN50A2VEB [20/24] Commissioning
14 Commissioning
Installation and operation manual
20
FXSN50~112A2VEB
CO₂ Conveni-Pack: indoor unit
4P602815-1D – 2020.07
IN/D OUT/D
F
1 F2 F1 F2
Control box
P
1
P
2
F
1
P
1
P
2
F
2
T
1
T
2
P
1
P
2
F
1
F
2
T
1
T
2
P
1
P
2
F
1
F
2
T
1
T
2
P
1
P
2
F
1
F
2
T
1
T
2
P
1
P
2
P
1
P
2
N
N
L
L
NL L N L N
b
c
e
d
a
a Outdoor unit
b Indoor unit
c User interface (controls 3 indoor units)
d Most downstream indoor unit
e For use with 2 user interfaces
▪ Setting master unit (Cooling/Heating masterhood). In case of
group control, connect the user interface wiring directly to the
master unit. Do not connect user interfaces directly to slave units.
Slave units are restricted in their operation by the master unit (e.g.
1 outdoor unit does not allow for 1 indoor unit to run in cooling
operation while another runs in heating operation). For setting
using the user interface, refer to the manual or reference guide of
the user interface.
INFORMATION
In case of group control, it is not necessary to assign a
group address to the indoor unit. The group address is
automatically set when the power is turned on.
13.3 To connect appropriate measures
for appliances filled with CO
₂
Appropriate measures are field supplied. For details on how to
connect wiring to the appropriate measures, refer to the
documentation of the used appropriate measures.
1 Determine the minimum number of appropriate measures for
the room in accordance with "11.1.2Additional installation site
requirements for CO₂ refrigerant"[413].
2 Connect the appropriate measures to the indoor unit terminal
block, symbols T1, T2.
3 If the CO
2
refrigerant leak detector is installed, enable the
function for refrigerant leak detection as described in
"15.1Field setting"[421].
P1 P2
F1 F2 T1 T2P1 P2
P1 P2
P1 P2
F1 F2 T1 T2
P1 P2
F1 F2 T1 T2P1 P2
c
b
a
a
a
b
b
d
e
f
13‒1 Example of appropriate measures connection layout for
one room
a Terminal strip on the indoor unit
b Terminal P1/P2 on the user interface
c Control panel (field supply)
d CO
2
refrigerant leak detector (field supply) in combination
with a safety alarm (field supply)
e Ventilation (natural or mechanical) (field supply)
f Shut-off valves (field supply)
14 Commissioning
NOTICE
ALWAYS operate the unit with thermistors and/or pressure
sensors/switches. If NOT, burning of the compressor might
be the result.
14.1 Checklist before commissioning
After the installation of the unit, first check the items listed below.
Once all checks are fulfilled, the unit must be closed. Power-up the
unit after it is closed.
You read the complete installation and operation
instructions, as described in the installer and user
reference guide.
The indoor unit is properly mounted.
The outdoor unit is properly mounted.
Make sure drain piping is properly installed, insulated
and drainage flows smoothly. Check for water leaks.
The ducting is properly installed and insulated.
The refrigerant pipes (gas and liquid) are installed
correctly and thermally insulated.
There are NO refrigerant leaks.
There are NO missing phases or reversed phases.
The system is properly earthed and the earth terminals
are tightened.
The fuses or locally installed protection devices are
installed according to this document, and have NOT been
bypassed.

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