Page 32
General Description
7.8 Power supply and control system
All units are provided with a microprocessor and a
“Chiller Control” system.
The electrical connection of the controls and the start-
up units for the motor are carried out and tested in
the factory. The power supply and control compo-
nents are separate and accessible from different
doors.
A door stop disconnecting switch is always avail-
able, and is mounted on the door of the appliance,
supply side. The cabinet includes also another door,
that can be opened from the top, waterproofed ac-
cording to IP 54 standard.
The power supply compartment includes:
h
Master switch
h
Network isolator, contactors, compressor fuses
Control panel includes:
h
A transformer for auxiliaries, fuses, relay and elec-
tronic card, a thermostat for the compressor’s de-
livery temperature
h
The keyboard and the display of the “Chiller-Con-
trol” microcomputer, mounted on the door of the
control section.
19
Nota:
the units are equipped
with two refrigeration
circuits. Only one cir-
cuit is illustrated for the
sake of simplicity.
10 Sight glass
11 Thermostatic valve
12 Solenoid valve
13 Plate-type heat exchanger
14 Liquid separator
15 Thermostat
16 Oil exchanger
17 Desuperheater (optional)
18 Safety valve
19 Liquid receiver
Components:
1 Screw compressor
2 Flexible hose (absorber)
3 Silencer
4 Reversing valve
(supply in cooling mode)
5 Liquid cock
6 Safety valve
7 Coil
8 Nonreturn valve
9 Filter
Safety devices:
A HP pressure switch
B LP pressure switch
C Transducer
D Differential water pressure
switch
Filling/discharge and
pressure intakes Freon
Suction points for
vacuum
V
SLH - Refrigeration circuit
Manuale SLS-SLH1 2.8.2005 12:34 Pagina 32
