58
Rules for a correct ductwork
• each duct must serve a maximum of 2 fans – DO NOT
EXCEED this limit
• in case of multiple fans in the same duct, they must belong
to the same refrigerating circuit and to the same coil
system – DO NOT MIX several refrigerating circuits or
coil systems in the same duct
IMPORTANT:
The duct connections on the units must not generate any
mechanical stress on the fan supporting structure.
The fan impellers and protection grilles must always remain
in their position inside the ducts.
Use bellows or exible sleeves for the duct connection.
Install an access hatch of at least 700 x 700 mm at each duct
outlet to allow the ventilation components to be replaced.
Fan motor electrical protection
In case of a locked rotor or an overload, the motors of each
circuit are electrically protected by the circuit drive.
Each drive follows a variable current characteristic, based on
the frequency from 10 to 60 Hz and the number of controlled
fans.
If a fan stops working, the drive automatically detects the
malfunction.
Refer to the control manual for the list of alarms specic to
this option.
12.2.7 - Power factor correction (Option 231)
The power factor correction is active for any operating condition of the unit.
The power factor performance is guaranteed at 0.95 when the unit is running in conditions which require a power supply that
exceeds the Eurovent standard condition.
A capacitor battery is controlled by a controller which reads the current draw by the unit and adjusts the power factor to a
setting of 0.95.
The capacitors are dry type: no risk of leakage or re.
The capacitors are selected for each unit as per below table:
180 200 220 300 330 400 430 470 520
Capacitor capacity kVAR 30 30 30 40 40 50 50 60 60 70 70 80
Capacitor 1 Capacity kVAR 10 10 10 10 10 10 10 20 20 10 10 20
Ir A 14 14 14 14 14 14 14 29 29 14 14 29
Capacitor 2 Capacity kVAR 20 20 20 10 10 20 20 20 20 20 20 20
Ir A 29 29 29 14 14 29 29 29 29 29 29 29
Capacitor 3 Capacity kVAR - - - 20 20 20 20 20 20 40 40 40
Ir A - - - 29 29 29 29 29 29 58 58 58
WARNING: Operation of the unit without capacitors raises the current.
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