Airwell SWS 1602 HFС 407C [29/82] General description
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Airwell SWS 1602 HFС 407C [29/82] General description

Airwell SWS 1902 HFС 407C [29/82] General description
Page 28
General Description
7.7 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.
A door stop disconnecting switch is always avail-
able, and is mounted on the door of the appliance.
IP 54 protection degree.
The power supply/control compartment includes:
I
Master switch
I
Network isolator, contactors, compressor fuses
I
A transformer for auxiliaries, fuses, relay and elec-
tronic card
I
The keyboard and the display of the “Chiller-Con-
trol” microcomputer, mounted on the door of the
control section.
7.8 “Chiller Control”
The “Chiller Control” unit consists of an expandable
interface card and a controller.
The function of the expandable interface card is to
monitor the inputs and control the outputs:
I
Digital inputs, such as alarm and control signals.
I
Analog inputs, such as temperature/pressure mea-
suring signals.
I
Digital outputs for the excitation of control relays
and remoto-control switches.
The microprocessor will execute the logic that con-
trols:
I
The LED and the display of the alarm signals and
the operation of the appliance.
I
The compressor’s start-up logic (excitation of the
winding and stop), potential regulation (3+3
steps).
SWR refrigeration diagram
10 Thermostatic valve
11 Evaporator
12 Safety valve
13 Suction cock (optional)
14 Nonreturn valve (optional)
15 Solenoid valve (optional)
16 Capillary (optional)
Components:
1 Screw compressor
2 Screw compressor’s
delivery cock
3 Flexible hose - absorber
(ELN version only)
4 Silencer (ELN version only)
5 Delivery cock
7 Liquid cock
8 Filter
9 Sight glass
Safety devices:
A HP pressure switch
B LP pressure switch
C Transducer
D Differential water pressure switch
Filling/discharge and
pressure intakes Freon
Nota: the units are equipped with two re-
frigeration circuits. Only one circuit is
illustrated for the sake of simplicity.
Manuale SWS-SWR EN1.qxp 05/11/06 14:18 Pagina 28

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