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12 - SAFETY ELEMENTS
Clogged fi lter detector (optional)
A diff erential pressure switch is a device used for detecting the
fi lter clogging level.
This pressure switch is installed in the electric cabinet of the
indoor module at the factory.
The pressure measurement is done using
two intakes located within the airfl ow, making
a comparison between the air pressure at the
inlet to the fi lter (positive) and the pressure
at the outlet, on the other side of the coil
(negative).
Note: With a mixing box (optional), the fi lters
are located inside it, and the intake at the
inlet to the fi lter must pass through a bushing inside the box.
The electronic control allows the settings selection for the
clogged fi lter alarm: only indication (by default) or unit stoppage.
Manual reset.
The pressure switch set value for alarm signaling is confi gured
in the factory, depending on the fi lters selected for the unit,
according to the following criterion (Standard EN 13053):
● Unit fi lter: the set value is the pressure drop for the fi lter
classifi cation, according to the attached table.
● Serial fi lters: the set value is the pressure drop of the highest
effi ciency fi lter + half of the pressure drop of the other fi lter,
according to the attached table.
Filter classifi cation
G4
F7
Note: all fi lter frames are labelled with a sticker that indicates
their classifi cation.
Clogged
fi lter
detector
Pressure drop (Pa)
150
250
Smoke detector (optional)
This smoke-detecting station, in accordance with the NF S 61-
961 standard, uses a LED to indicate the installation status, If
the probe detects the presence of smoke in the installation, it
stops the operation of the unit and gives the order to open or
close the outdoor damper (confi gured by parameter).
To ensure compliance with the French regulations on Fire
safety (ERP), it's possible to confi gure the opening of the fresh
air damper and the exhaust air damper to 100% (return air
damper closed).
The station is installed in the factory in the electrical cabinet
of the indoor module. To reset the station, it is necessary to
disassemble the protection box.
The probe is placed next to the supply fans.
Smoke detecting probe
Remote alarm (optional)
"50FC" control allows the management of a relay for remote
alarm signaling.
The output for the general alarm signal is not compatible with
the heat recovery coil (optional).
In this case, upon request, it would be possible to have a general
alarm output in an input/output expansion module (see the
"50FC" control manual).
Smoke
detecting
station
27
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