Table of Contents
Advertisement
11 - SAFETY ELEMENTS
11.9 - Anti-fi re safety
The electronic control can activate an anti-fi re safety device that
detains the unit when the return air surpasses a temperature of
60°C (by default).
It cannot return to operation until the temperature has dropped
to below 40ºC.
Note: "50FC" electronic control allows to select the functioning
logic for the fulfi llment of the ERP French fi re regulations.
11.10 - Condensation and evaporation pressure
control
This safety, integrated in the control, enables managing the outdoor
fan(s) when the units are working in cooling mode with low outdoor
temperatures (condensation control) or in heating mode with high
outdoor temperatures (evaporation control). This aids the unit's
operation in all the seasons.
With electronic axial fans, the speed control is proportional, based
on the average pressure measured by the pressure transducers.
11.11 - Control of air fl ow
The supply plug-fans adapt their speed to the average fl ow
measured by the diff erential pressure sensor and the value set
as a setpoint in the electronic control.
11.12 - Filter fouling detection (optional)
Diff erential pressostat for detection of the fi lter fouling level.
This pressostat is installed in the factory:
■ In the electric cabinet, for "Standard"
models.
■ On a panel next to the indoor coil,
for "In-line" models.
Pressure reading is done thanks to
two intakes within the air fl ow, such
that a comparison is made between
the pressure of the inlet air to the
fi lter (positive) and the supply air of
the same to the other side of the coil
(negative).
The electronic control allows the
settings selection for the clogged fi lter
alarm: only indication (by default) or unit stoppage. Manual reset.
The pressostat set value for alarm signalling is confi gured in
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
M6 / F7
F8 / F9
Note: all filter frames have a sticker indicating the filter
classifi cation.
Important: This safety device is particularly recommended with
gas burner.
Pressure drop (Pa)
150
250
350
11.13 - Smoke detector (optional)
In accordance with standard NF S 61-961, this smoke detection
station uses a LED to indicate the installation status, and if the
probe detects the presence of smoke in the installation, it stops
the operation of the unit.
The station is installed in the factory on a panel next to the electrical
cabinet. To reset the station it is necessary to disassemble the
protection box.
The probe is placed on a pillar next to the supply fan.
Smoke
detecting
station
11.14 - Freeze protection OAT (optional)
■ Electrical heater for protecting the components of the electrical
cabinet. This safety device is mandatory for an outdoor
temperature lower than -10°C WB.
A reinforced electrical heater is mandatory for a temperature
lower than -14°C WB.
The electrical heater(s) is(are) activated when the thermostat
installed inside the electrical cabinet detects that the
temperature drops below 5°C.
■ Compressor with low-temperature protection using an additional
crankcase heater: mandatory for an outdoor temperature lower
than -10ºC WB.
Activation temperature: -10ºC WB.
■ Electrical heater for freeze protection of the economizer
dampers: mandatory for an outdoor temperature lower than
-14ºC WB.
Activation temperature: -14ºC WB.
■ Electrical heater for protection of the gas burner housing
(optional): mandatory for an outdoor temperature lower than
-14ºC WB.
Housing temperature for activation: +1ºC.
■ Spring shut-off dampers for automatic closing in the case of
a cut in power.
11.15 - Remote alarm (optional)
"50FC" control allows the management of a relay for remote alarm
signalling.
11.16 - Refrigerant leak detector (optional)
The gas detector sensor is a device that signals leaks in refrigerant.
When the loss of a certain concentration is detected, the sensor
sends the alarm to the control, which stops the unit and locally
activates a acoustic and visual signal.
This allows prompt identifi cation of gas leaks, guaranteeing
the safety of any people in the vicinity. Installation of the device
ensures compliance with European
standards F-GAS and EN378 as well as
ASHRAE 15.
This sensor is installed next to the supply
fan. In case of alarm, it is reset manually.
Smoke
detecting
probe
Air inlet tube
33
Advertisement
Table of Contents
