12
Depression Discharge
Discharge Formula:
T = -2p; S = T /2
Example:
p = -300 Pa/9.81 = - 30 mm of wc; T = 60 mm S = 30 mm
Pressure Discharge
Formula T = 2 p S = T /2
Example
p = 400 Pa = 40 mm; T = 80 mm; S = 40 mm
5 - ELECTRIC CONNECTIONS
5.1 Preliminary information
The features of the lines must be determined by personnel
enabled to the designing of electric systems, complying
with the standards in force.
The protective equipment of the unit supply line must be
able to shut-off the presumed short circuit current, which
value must be determined in accordance with the system
features. The section of the power supply cables and of the
protective cable must be determined in accordance with
the features of the used protections.
All electrical operations must be carried out by personnel
having the legal requisites, trained on the risks related to
these operations.
Work respecting the current safety standards.
5.2 Electric data
The name plate shows the electric data specific of the unit,
including any electric accessories. The electric data
indicated in the technical schedule and in the manual refers
to the standard unit, excluding accessories. Refer to the
data reported in the nameplate of each component/
accessories.
F.L.A: Full load ampere
Absorbed current at maximum admitted conditions
F.L.I: Full load input
Power absorbed with full load (at maximum admitted
conditions)
5.3 Connections
Refer to the wiring diagram of the unit (the number of the
wiring diagram is indicated behind the terminal block
cover). Check that the mains have features that conform to
the data reported on the name plate.
Before starting work, check that the isolation device at unit
power supply line start is open, blocked and provided with
necessary signs/ lockout/tagout. First carry out the earth
connection.
Protect the cables using adequately-sized cable glands.
Before electrically powering the unit, ensure that all
protections removed during electric connection are
restored.
5.4 Data-signal lines
Do not exceed the maximum admitted distance that varies
based on the type of cable and signal. Lay the cables away
from the power lines, with different voltage, or that emit
interferences of electromagnetic origin.
Avoid laying the cables near the equipment that can create
electromagnetic interferences.
Avoid laying them in parallel with other cables, any
intersection with other cables is admitted only if at 90°C.
The unit must be connected to earth without
interferences.
Guarantee continuity for the entire extension of the cable.
Respect the indications on impedance, capacity and
attenuation
5.5 Electric motor connection
Remove the cover of the terminal block on the electric
motor, and check that the connections of the terminals
conform to the power supply voltage.
Note that the air handling units are supplied as follows:
STANDARD motor, single polarity up to 4kW:
Motor with direct starting, 230/400V 230V delta, 400V star
N.B.: The 230/400 motors may have a star/delta connection
only where 230V three-phase power is available.
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