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Idiomas disponibles
Outlet water
Ethylene glycol
temperature [°C]
(% vol.)
4
5
2
10
0
15
-2
20
-4
25
-6
30
3.3.3
Expansion tank (water version)
To avoid the possibility of an increase or decrease in the volume of the
fl uid due to a signifi cant change in its temperature causing damage to
the machine or the water circuit, we recommend installing an expansion
tank of suitable capacity.
The expansion tank must be installed on intake to the pump on the rear
connection of the tank.
The minimum volume of an expansion tank to be installed on a closed
circuit can be calculated using the following formula:
V=2 x Vtot x (Pt min - P t max)
where
Vtot= vol. circuit total (in litres)
P t min/max= specifi c weight at the minimum/maximum temperature
reached by the water [kg/dm3].
The specifi c weight values at different temperatures for glycol percenta-
ge 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.
English
3.4 Electrical circuit
Ambient
temperature
3.4.1
Checks and connections
-2
!
Before carrying out any operation on the electrical system, make
-5
sure that the appliance is disconnected from the electrical power
-7
supply.
All electrical connections must comply with the applicable regulations
-10
in force in the country of installation.
-12
Initial checks
-15
1) The power supply voltage and frequency must correspond to the
values stamped on the chiller nameplate. The power supply cha-
racteristics must not deviate, even for brief periods, from the toleran-
ce 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%
Connections
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 bre-
aker with a trip rating of (RCCB - IDn = 0.3A), with the current rating
30
40
50
indicated in the reference electrical diagram, and with a short circuit
current rating appropriate to the short circuit fault current existing in
0.9936
0.9905
0.9869
the machine installation area.
1.0067
1.0030
0.9989
The nominal current In of the magnetic circuit breaker must be equal
1.0199
1.0156
1.0110
to the FLA with an intervention curve type D.
5) Max. grid impedance value = 0.274 ohm.
1.0330
1.0282
1.0230
Subsequent checks
Check that the machine and the auxiliary equipment are earthed and
protected against short circuit and/or overload.
!
Once the unit has been connected and the upstream main switch
closed (thereby connecting the power supply to the machine), the
voltage in the electrical circuit will reach dangerous levels. Maximum
caution is required!
3.4.2
General alarm
All the chillers are equipped with an alarm signalling system (see
electrical diagram), comprised of a switching free contact in a terminal
block: this may be used for the connection of an external audible or vi-
sual 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 (par.7.3):
- To enable the remote rif. n.16387
ICEP040-060
- As reference variable ON/OFF rif.n.8996
Note: do not enable together "Sup" and "Re" .
See the electrical diagram for the connection of the remote ON-OFF
(par.7.7)
3.5 High head pressure axial fans version (C)
Used when ducting of the hot air coming from cooling is required.
The High head pressure axial fans are able to give the air a useful static
pressure that overcomes the pressure losses due to ducting.
Important: Units equipped with high head pressure axial fans cannot be
installed in open air without ducting. To work correctly, the centrifugal
fans require a minimum counterpressure preventing the electric motor
from "over-revving" and its consequent breaking.
Rules for ducting
1) Each fan must be individually ducted: the fans must be able to work
independently.
2) The ducting must have air fl ow are as equal to those of the fans
installed on the unit.
!
Caution: Maximum pressure losses = 130 Pa.
3.6 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.
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