E/0204/39/28
11.3 CONTACTORS
control the motors by operating with auxiliary voltage.
They refer to IEC947-4-1 standards.
11.4 AUTOMATIC CIRCUIT BREAKERS
protect against short circuits and excessive motor current. They have adjustable thermal and
magnetic triggering devices.
11.5 AUTOTRANSFORMER
This device is necessary, when the power supply voltage differs from the standard voltage. The
autotransformer adapts the supplied voltage to the standard voltage.
It is manufactured in compliance with EN60742 and CEI14-6 standards. When the space is sufficient,
it is installed in the unit.
STANDARD COMPONENTS with MECHANICAL THERMOSTAT CONTROL
11.6 REGULATING THERMOSTAT (TRA)
The mechanical thermostat is suited for wall installation (with expansion steam/humidity sensor). It
should be installed in the room to be conditioned with a sufficient distance to the supply air outlet so
as to measure an average temperature. It measures and controls the temperature providing the
start signal for the compressor. The adjustment range is +5°C to +30°C, the switching contacts
10A - 250VAC.
11.7 COMPRESSOR START DELAYING DEVICE (RT)
It is included in standard configuration of mechanically controlled units and prevents the compressor
from starting immediately after a stop, helping this way to increase the life cycle of the compressor.
11.8 ANTIFREEZE THERMOSTAT
Similar to the adjustment thermostat, it is calibrated in such a way as to prevent the possible
formation of ice on the evaporator.
11.9 CONDENSATION CONTROL PRESSURE SWITCH
controls the fan's ON/OFF contact to keep condensation temperature constant.
OFF 12,5 + 1,5 bar ON 16,5 + 1 bar
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