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MINIMUM INSTALLATION AREA FOR UNITS WITH R32
The unit must be selected according to the minimum square footage given in the table below, referring to the smallest room
served by the unit at the installation site.
The unit itself cannot be intended as a safety feature for the indoor environment.
The responsibility for proper installation and safety of the environments served by the unit rests entirely with the installer.
For installations that do not comply with the table, the environment must be adapted in accordance with the chapters on
additional safety of the EN378-3 standard and the applicable local regulations.
The installer is fully responsible for the sizing activities and the implementation of these additional safety measures.
The minimum surface areas to be respected, referring to the smallest room served by the unit at the installation site, are those
corresponding to the external unit with the largest capacity listed in Chapter 3.5.5.
The table below shows the minimum surface area values for each external unit. These are indicated depending on the "h0"
reference height, which must be considered starting from the height from the floor of the lowest vent in the room.
SAFETY DEVICE FOR THE USE OF A2L GAS
The units are always equipped with an R32 refrigerant presence sensor at the delivery fan compartment in order to detect
possible refrigerant leaks.
Once the leak has been detected, the unit maintains a minimum level of ventilation in order to prevent an excessive accumulation
of
gas
in
the
If the leak occurs when the machine is switched off, the alarm does not allow the unit to start.
The unit is also equipped with a "sensor fault" alarm, which triggers the same actions as described above should a fault be
detected in the sensor itself.
SAFETY DAMPER ACCESSORY
When the unit has to serve rooms with naked flames (e.g. smoking rooms, kitchens, etc.), in order to guarantee a greater level
of safety, the unit is equipped with class 4 dampers (according to EN 751) on the air supply and return, in order to isolate the
served environment in the event of a leakage of refrigerant gas.
Once the leakage is detected, the unit is turned OFF and the dampers connecting the unit to the indoor environment are closed,
ventilation is stopped and natural ventilation is ensured by opening the external air intake damper and the counter-rotating blade
on the supply damper to evacuate the possible refrigerant leakage from the unit.
If the leak occurs when the machine is switched off, the alarm does not allow the unit to start.
The unit is also equipped with a "sensor fault" alarm, which triggers the same actions as described above should a fault be
detected in the sensor itself.
In this case, ventilation is stopped and natural ventilation is ensured by opening the external air intake damper and the counter-
rotating blade on the supply damper to evacuate the remaining refrigerant leakage.
In the case of the AR machine, where there is no external air intake damper, the supply damper is equipped with a counter-
rotating blade, which opens outwards when the machine is not in operation.
Installation, use and maintenance manual
Height of the appliance's ports
(h
conditioned
environment,
in EN 378-1, Annex C.2)
0
[m]
0.6
1
1.8
2.2
diluting
it
Minimum indoor installation areas
PUZ-
PUZ-
PUZ-
ZM / M
ZM / M
ZM / M
100
125
140
[m²]
[m²]
[m²]
306
306
306
110
110
110
34
34
34
23
23
23
with
the
treated
PUZ-
PUZ-
ZM / M
ZM / M
200
250
[m²]
[m²]
338
394
122
142
38
44
25
29
air
flow.
16
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