Airwell SLS 1902 [31/77] General description
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Airwell SLS 1902 [31/77] General description

Airwell SLS 1402 [31/77] General description
Page 30
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 components are sepa-
rate and accessible from different doors. A door stop
disconnecting switch is always available, 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 according to IP
54 standard.
The power supply compartment includes:
I
Master switch
I
Network isolator, contactors, compressor fuses
Control panel includes::
I
A transformer for auxiliaries, fuses, relay and elec-
tronic card, a thermostat for the compressor’s de-
livery temperature
I
The keyboard and the display of the “Chiller-Con-
trol” microcomputer, mounted on the door of the
control section.
7.9 “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 exciting the control relay and
the remote-control switch.
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).
I
The display of the compressor’s working hours
and the temperature of the water to the evapora-
tor.
I
The anti-cycling and delay timing upon start-up.
I
The automatic advance/delay sequence for the
compressor start-up.
I
The fan stop.
Reference and parameter control:
I
User level: the operator can modify any data with
the ‘ENTER’, ‘+’ and ‘-’ keys.
I
Service level: password protected access by the
authorised personnel.
7.10 Accessories
List of the available accessories, supplied separately,
to be mounted on-site by the installer:
Flow switch
Prevents the operation of the unit if the circulating
chilled fluid is insufficient. It is recommended to in-
stall a flow switch to ensure the correct operation of
the unit.
Water filter
Filter to be mounted on the suction side of the water
heat exchanger.
Antivibrating supports (AVM)
Isolating spring supports, provided with bolts for fas-
tening onto the base. They are supplied separate
from the unit, and shall be mounted on site at the cus-
tomer’s expense.
Remote keyboard panel
Makes it possible to control the unit through the re-
mote terminal, up to a maximum distance of 200 me-
ters.
Chiller Data Logger
Records continuously the essential thermodynamic
operating parameters, during the 10 minutes that
precede the last alarm.
Modem GSM
Makes it possible to check the working mode or the
switching on/off of the unit via SMS. In case of any
alarms, the unit sends an SMS to the user.
RS-485 MODBUS serial card
A communication interface allows you to control and
manage the unit from a local station, with RS485
connection, up to a distance of 1000 m.
It is therefore possible to obtain remote control and
management by integrating these functions into the
building’s control system.
External hydronic kit
Hydronic kits consisting of pumps and storage tanks
(1,000 to 1,500 litres).
Single Point supply box
This accessory is available for SLS twin units, and
makes it possible to obtain only one power supply
point.
SLS1-en.qxp 29-06-2007 15:37 Pagina 30

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