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12 - SAFETY ELEMENTS
High-pressure switch
Connected to the compressor discharge, it will stop its operation
when the pressure at that point reaches the setpoint.
It is automatically reactivated.
Specifi ed pressure to activate switch:
42,0 bar.
Safety valve
All models include a safety valve in the high pressure line. Valve
tare value at 45 bar.
Caution: Avoid the valve triggering direction
Low-pressure safety
The low-pressure safety is done by the "50FC" electronic control
via the measure of the low-pressure transducer.
Protection for power lines
Protection for power lines of compressors with manual motor
starters and power lines of fan motors with magnetothermic
switches.
These devices provide protection against overload, short circuit,
phase failure and undervoltage.
Automatic switch in the control circuit
Magnetothermal switch that protects the operation circuit against
continuous surges as well as against high currents of short
duration (short circuits).
Main door switch
A mechanical interlock prevents access to the
electrical cabinet (outdoor module) when the
unit is under voltage.
Important: Always ensure that the main power to
the outdoor module is turned off before working
on the indoor module.
Defrost control
This safety device is intended to eliminate ice which could
accumulate in the outdoor coil when the unit is working in
heating mode.
Defrosting is carried out by the control depending on the outdoor
temperature and the value measured by the low-pressure
transducer.
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Safeties at the compressors
● These units have a klixon switch on the compressor discharge
which stops the operation of the motor when there is excessive
heating.
● Compressor lock: In the event of a power cut-off for a period
longer than 2 hours, the compressors will be locked. The unit
must remain 8 hours consecutively with voltage to unlock the
compressors. A warning screen on the graphic terminal shows
the remaining time until the end of the locking.
● High temperature safety in tandem compressors (optional):
Working in COOLING mode, when the outdoor coil pressure of
a circuit overcomes a limit value one of the two compressors
will be stopped, thereby avoiding the stop of both compressors
due to the high pressure. This compressor will start working
again if the pressure drops below a safety value.
Control of airfl 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.
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.
It is possible to control the condensation and evaporation
pressures by acting proportionally on the speed, depending on
the pressure measured by the pressure transducers.
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.
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). The unit will stop working until the temperature
drops below 40°C.
Note: It is important to note that "50FC" electronic control has
parameters that allow to customize the unit's operation to comply
with the French ERP fi re regulations for public access buildings,
as stated in article CH40 paragraph 3.
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