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8 - SAFETY ELEMENTS
Low pressure pressostat
When connected to the compressor suction,
it will stop its operation when the pressure
at that point goes down below the tare value
(caused by obstructions in the circuit, excessive dirt in the fi lters,
fan stop or ice formation in the evaporator).
This pressostat disconnects at 2 bar and is automatically
reactivated.
High pressure pressostat
Connected to the compressor discharge, it
will stop its operation when the pressure at
that point reaches the setpoint. It disconnects
at 42 bar and it is automatically reactivated.
Safeties at the compressor
The scroll type compressor that these units as standard have
the following safeties:
● Non-return valve built into the compressor.
● Temperature probe for the discharge from the compressor
to protect the unit with discharge temperatures greater than
135ºC.
Main door switch
By using a mechanical device, it impedes access to the electric
panel when the unit is with voltage.
Magnetothermals for line protection
They are located at the beginning of the power lines for the
compressors and motor fan(s) to protect them.
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).
Defrost control
This safety device is intended to eliminate ice which could
accumulate in the outdoor coil when the unit is working in the
heating cycle. Defrosting is carried out by the control depending
on the value measured by the sensor(s) on the outdoor coil(s)
and the time set between defrosting operations.
Condensation and evaporation pressure control
This safety device, 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.
In the case of EC electronic fans (optional), speed control will
be proportional based on the average pressure measured by
the pressure transducer(s) in the outdoor coil(s).
Protection of the electric panel (optional)
Electrical heater for protecting the components of the electric
panel.
Anti-fi re safety
With the optional return air probe, 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.
15
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