Accumulator tank
In stainless steel, with a 700-litre capacity.
In order to reduce the thermal dispersion
and eliminate the phenomenon of the
formation of condensation, it is insulated with
polyurethane material of a suitable thickness.
One antifreeze electric heater of 300W (down
to -20°C outside temperature and tank water
temperature 5°C) assembled as standard and
commanded from the card via an antifreeze
sensor inserted in the tank.
Drain valve (all versions)
Of the automatic type, assembled on the
upper part of the hydraulic system; it releases
any air bubbles that may be present in the
system.
Filling assembly
(versions with accumulator)
This has a pressure gauge showing the pressure
in the system.
Expansion tank
(versions with accumulator)
Of the membrane type, with nitrogen pre-
charge.
Hydraulic circuit safety valve
(only for versions with pump or with accumulator)
Calibrated to 6 bar and with ductable
discharge, it releases overpressure in the
event of abnormal working pressure levels.
3.3.
SAFETY AND CONTROL COMPONENTS
Low pressure switch (BP)
−
Cooling-only (L)
Of fixed calibration, located on the low
pressure side of the refrigerating circuit, it
stops the operation of the compressor in the
event of anomalous work pressures.
High pressure switch (AP)
−
Cooling-only (L)
−
Heat pump (HL)
With fixed calibration, placed on the high
pressure side of the chiller circuit, it shuts
down compressor operation in the case of
abnormal operating pressure.
Low pressure transducers (TP2)
−
Cooling-only (L) “accessory”
−
Heat pumps (HL) "standard"
Placed on the high pressure side of the chiller
circuit, it communicates to the control card
the operating pressure, sending a pre-alarm
in case of abnormal pressure.
High pressure transducer (TP3)
−
Standard for all the versions
Placed on the high pressure side of the chiller
circuit, it communicates to the control card
the operating pressure, sending a pre-alarm
in case of abnormal pressure.
Anti-freeze heater
(installed as standard)
Its operation is commanded by the antifreeze
probe located in the plate-type evaporator.
It is activated when the water temperature
is +3°C, and deactivated when the water
temperature is +5°C. The dedicated software
in the regulation card manages the heater.
Refrigerating circuit safety valve
This intervenes by releasing overpressure in the
event of abnormal working pressure levels.
- Calibrated at 45 bar on the HP branch
- Calibrated at 30 bar on the BP branch
(only for heat pumps)
Evaporator antifreeze heating element
Its operation is commanded by the
antifreeze probe located in the plate-type
evaporator. It is activated when the water
temperature is +3°C, and deactivated
when the water temperature is +5°C. The
dedicated software in the regulation card
manages the heater.
3.4.
ELECTRICAL COMPONENTS
ELECTRICAL PANEL
Contains the power section and the
management of the controls and safety
devices.
In accordance with standards:
CEI EN 61000-6-1
CEI EN 61000-6-2
CEI EN 61000-6-4 (immunity and
electromagnetic emissions for the industrial
sector).
and Directives EMC 89/336/EEC and
92/31/EEC concerning electromagnetic
compatibility, Low Voltage Directive LVD
2006/95/EC.
DOOR LOCK KNIFE SWITCH
IT is possible to access the electrical panel
by disconnecting the voltage, then using
the opening lever of the panel itself. This
lever can be blocked with one or more
padlocks during maintenance, in order to
prevent the machine being powered up
accidentally.
CONTROL KEYPAD
Provides full control functions. For a detailed
description refer to the user manual.
Remote control panel
This allows the chiller command operations
to be given from a distance.
compressor protection thermomagnetic
switch;
fan protection thermomagnetic switch;
auxiliary protection thermomagnetic switch;
discharge gas temperature control
thermostat.
ELECTRONIC REGULATION
MICROPROCESSOR CARD
Consisting of a management/control card
and a visualisation card.
• Functions carried out:
−
adjustment of water temperature
at evaporator inlet, with thermostat
control for up to 4 levels and integral-
proportional fan speed control (with
DCPX accessory);
−
compressor start-up delay;
−
compressor sequence rotation;
−
count of compressor work hours;
−
start/stop;
−
reset;
−
permanent alarms memory;
−
autostart after voltage drop;
−
multi-lingual messages;
−
operation with local or remote control.
•
Machine status display:
−
ON/OFF compressors;
−
alarms summary.
• Alarm management:
−
high pressure;
−
flow switch;
−
low pressure;
−
anti-freeze;
−
compressor overload;
−
fan overload;
−
pump overload.
•
Display of the following parameters:
−
water inlet temperature;
−
accumulator temperature;
−
water outlet temperature;
−
delta T;
−
high pressure;
−
low pressure;
−
waiting time for restart;
−
alarms visualisation.
• Settings:
a) without password:
cooling set;
total differential.
b) with password:
antifreeze set;
low pressure exclusion time;
display language;
access code.
For further information, refer to the user
manual.
10
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