Carrier 50FC Installation, Operation And Maintenance Instructions page 31

11 - SAFETY ELEMENTS
Refrigerant leak control
Possible refrigerant leakage in case of low pressure alarm.
Although sometimes the alarm has other reasons, the control
allows to detect possible leakage, improving the protection of the
environment.
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. This
position ensures the correct reading of the gas concentration in
the indoor coil.
■ ● 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 configurable 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 antifreeze protection of dampers of the
mixing box: mandatory for an outdoor temperature lower than
-14ºC WB (upon request).
Activation temperature: -14ºC WB.
■ Electrical heater for protection of the gas burner housing
(optional): mandatory for an outdoor temperature lower than
-14ºC WB (upon request).
Housing temperature for activation: +1ºC.
■ Dampers of the mixing box with springs for automatic closing
in the case of a cut in power (upon request).
Remote alarm (optional)
"50FC" control allows the management of a relay for remote alarm
signalling.
Note: The output for general alarm signal is not compatible with
the following options: hot water coil, heat recovery coil, rotary heat
exchanger and on/off signal for external humidifi er.
With these options, possibility of general alarm upon request (refer
to the electronic control manual).
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