Tabla de contenido
Publicidad
Idiomas disponibles
Idiomas disponibles
The specifi c weight values at different temperatures for glycol percent-
age values are given in the table.
%
Temperature [°C]
glicol
-10
0
10
20
0%
1.0024
1.0008
0.9988
0.9964
10%
1.0177
1.0155
1.0130
1.0101
20%
1.0330
1.0303
1.0272
1.0237
30%
1.0483
1.0450
1.0414
1.0374
!
Caution: When fi lling the system, take into account the ca-
pacity of the expansion vessel as well.
3.4 Electrical circuit
3.4.1
Checks and connections
!
Before carrying out any operation on the electrical system, make
sure that the appliance is disconnected from the electrical power sup-
ply.
All electrical connections must comply with the applicable regulations
in force in the country of installation.
Initial checks
1) The power supply voltage and frequency must correspond to the
values stamped on the chiller nameplate. The power supply charac-
teristics must not deviate, even for brief periods, from the tolerance
limits indicated on the electrical diagram , which are +/- 10% for the
voltage; +/- 1% for the frequency.
2) The power supply must be symmetrical (the effective voltages and
the phase angles of consecutive phases must be equal). The maxi-
mum permissible voltage imbalance is 2%.
3) A differential thermal-magnetic switch suitable for the absorption
specifi ed on the data plate, with contact gap enabling complete dis-
connection in category III overvoltage conditions and complying with
the regulations in force, must be installed between the power cable
and the electric line. For the correct sizing of the switch, refer to the
absorbed current specifi ed on the appliance data plate. The chosen
device must be lockable in the open position in case of maintenance.
Collegamento
1) The electrical power supply must be connected to the chiller using a
4-wire cable, comprising 3 phase conductors and an earth conduc-
tor, with no neutral. For minimum cable section, see par. 7.3.
2) Pass the cable through the cable entry on the rear panel of the
machine and connect the phase and neutral to the terminals of the
main isolator switch (QS); connect the earth wire to the earth terminal
(PE)..
3) Ensure that supply cable has at its source protection against direct
contact of at least IP2X or IPXXB.
4) On the supply line to the chiller, install a residual-current circuit
breaker with a trip rating of (RCCB - IDn = 0.3A), with the current
rating indicated in the reference electrical diagram, and with a short
circuit current rating appropriate to the short circuit fault current
existing in the machine installation area.
English
The nominal current In of the magnetic circuit breaker must be equal
to the FLA with an intervention curve type D.
5) Max. grid impedance value = 0.274 ohm.
Subsequent checks
30
40
50
Check that the machine and the auxiliary equipment are earthed and
protected against short circuit and/or overload.
0.9936
0.9905
0.9869
!
1.0067
1.0030
0.9989
Once the unit has been connected and the upstream main switch
closed (thereby connecting the power supply to the machine), the
1.0199
1.0156
1.0110
voltage in the electrical circuit will reach dangerous levels. Maximum
1.0330
1.0282
1.0230
caution is required!
3.4.2
General alarm
All the chillers are equipped with an alarm signalling system (see electri-
cal diagram), comprised of a switching free contact in a terminal block:
this may be used for the connection of an external audible or visual
alarm, or used to provide an input signal for a logic control system such
as a PLC.
3.4.3
ON/OFF remoto
All the chillers can be connected to a remote ON/OFF control.
See the electrical diagram for the connection of the remote ON-OFF
contact.
3.5 Water-cooled version (W)
In the water-cooled version, the chillers require a water circuit that
takes the cold water to condenser.
The water version chiller is equipped with a pressure regulating valve
at the condenser inlet, whose function is to regulate the water fl ow in
order to always obtain optimum condensation.
Preliminary checks
If the water supply to the condenser is by means of a closed circuit,
perform all the preliminary checks listed for the main water
circuit (para. 3.3.1).
Connection
1) It is advisable to equip the cooling water circuit with shutoff valves,
enabling the machine to be cut out in case of maintenance.
2) Connect the water delivery/return pipes to the special connections
located on the back of the unit.
3) If the cooling water is "expendable" it is advisable to equip the
circuit with a fi lter at the condenser inlet, in order to reduce the risk
of the surfaces becoming dirtied.
4) If the circuit is of the closed type, make sure it is fi lled with
water and the air properly vented.
ICEP007-024 (60Hz)
3 / 8
Publicidad
Capítulos
Tabla de contenido
