EN
27
2 .13 Electrical connections
Before carrying out any intervention, make sure that the elec-
trical power supply is switched off.
For electrical connections, refer to the wiring diagram in 2.15
Wiring digarams p. 30 especially concerning the power supply
terminal strip.
The power supply voltage must be equal to that shown in the
technical data table.
The wires must have pointer terminals with a cross section pro-
portionate to the connecting wires before their insertion into
the terminal strip.
The power supply must be adequately dimensioned to avoid
voltage drops or overheating of the wires or other devices along
the line For data relating to sizing, refer to the table below
The power line must be cut from the rest of the electrical mains
of the building by means of a single-core circuit breaker compli-
ant to EN 60335 part 1 (with at least 3 mm contact gap), suited
for the unit maximum absorbed current, with a residual current
circuit breaker as to indicated by the individual electrical stand-
ards.
Check that the electric power voltage does not drop under
the nominal value -10% during operation of the compressor
and in case of three-phase power the maximum phase im-
balance is 3%.
The manufacturer is not responsible for any damage resulting
from the lack of an earth connection or the failure to observe
that indicated in the wiring diagrams.
It is forbidden to use the gas or water pipes to earth the de-
vice.
Model
U.M.
7M
9M
12M
12T
15M
15T
Sizing table of the power supply line
Voltage
V(50Hz)
230
230
230
400-3N
230
400-3N
WITHOUT RESIST
ORS
Power input
kW
3,0
3,5
4,5
4,5
5,5
5,5
Absorbed current
A
15,0
18,0
23,0
7,6
28,0
9,3
Circuit breaker treshold
A
16
20
25
10
32
10
Minimum wiring section
mm²
4
6
6
2,5
10
2,5
WITH
RESIST
ORS
Power input
kW
9,0
9,5
10,5
10,5
11,5
11,5
Absorbed current
A
46,0
48,6
53,7
17,8
58,8
19,5
Circuit breaker treshold
A
50
50
64
20
64
20
Minimum wiring section
mm²
16
16
25
6
25
6
2 .13 .1 Power line dimensioning table
Below is a table with the indications for the sizing of the power
supply line and related protection device.
It is not a matter of average absorption or transient peaks, but of
values to be considered for the correct sizing of the system and
for the request of the contractual power (excluding the loads
due to the normal operation of the building).
We recommend to adopt automatic thermal and magnetic de-
vices with adequate intervention curves (to avoid rapid inter-
ventions) and selective differential switches.
In non-residential buildings, an intervention threshold of more
than 30 meterA is recommended.
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