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11 - SAFETY ELEMENTS
R-454B Refrigerant leak detector (standard)
Due to the A2L category of refrigerant R-454B (lightly fl ammable), it
requires the installation of a refrigerant leak detector. This detector
uses infrared instead of semiconductor technology with no need
of calibration (self-calibration), with very fast time response, and
high lifetime (life cycle: 15 years).
This detector integrates, in a single assembly, housing +
electronics + sensor. It is divided into two parts, for easy inspection
and sensor replacement. Degree of protection: IP65
This detector is installed on a panel next to the supply fans of the
indoor circuit. This position ensures the correct reading of the gas
concentration in the indoor coil.
If the sensor detects a high concentration of gas (parameterizable)
the unit enters the PROTECTION MODE. The electronic control
instantly disables the compressors and support elements,
activates the indoor fans (supply and also return if available)
at 100% of airfl ow (parameterizable) and opens the fresh and
exhaust air dampers at 100% (if they are available). This happens
temporarily, as long as the leak occurs or the sensor is held down
with failure. If one of these two conditions ceases, the unit will
return to the operating mode it had before the leak and the warning
of protection mode will disappear.
If the unit is connected to a BMS monitoring system, the electronic
control is prepared to send an alarm signal in case of leakage
detection.
In any case, alarms will be maintained until they are reset from
the graphic terminal.
For more detailed information consult the "Maintenance" chapter.
■ ● En primer lugar hay que colocar el detector en la máquina:
Sensor
R-410A Refrigerant leak detector (optional)
The gas detector sensor is a device that
signals leaks in refrigerant (in ppm).
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 detector incorporates confi gurable relay outputs,
bluetooth connection and an user interface.
This allows prompt identifi cation of gas leaks, guaranteeing the
safety of any people in the vicinity.
This sensor is installed next to the supply fans. In case of alarm,
it is reset manually.
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, by parameters, the
operating logic for the fulfi llment of the ERP French fi re regulations
(Public access building), article CH40 paragraph 3.
Smoke detector (optional)
Smoke detecting station in accordance with the NF S 61-961
standard, 961, that 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 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
damperand the exhaust air damper to 100% (return air damper
closed).
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 next to the supply fans.
Smoke detecting probe
Anti-freeze protection for low outdoor temperatures
(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.
Remote alarm (optional)
"50FC" control allows the management of a relay for remote alarm
signalling.
The output for general alarm signal is not compatible with the
following options: hot water coil, heat recovery coil, gas boiler,
rotary heat exchanger and on/off signal for external humidifi er.
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).
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