Airwell SLS 2002 [23/77] Operation
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Airwell SLS 2002 [23/77] Operation

Airwell SLS 3002 [23/77] Operation
Page 22
6 OPERATION
The units SLS are equipped with a microprocessor
control logic and regulation management system.
The system consists of a unit logic board and a liquid
crystal control panel which manages the control,
starting, shutdown and display functions.
6.1 General Informations
I
Introduction
The information and the operating instructions of the
electronic control system mounted on the unit are list-
ed here below.
I
Main characteristics
– Microprocessor control
– User friendly easy reachable keyboard
– Proportional – Integral control of return water tem-
perature (RWT)
– Hysteresis type control of leaving chilled water tem-
perature (LWT)
– Access code to Service Level
– Acoustic and LED alarm indication
– Backlighted liquid crystals display
– Closed loop condensing pressure control
– Start and stop pump down logic
– Cooling capacity steps rotation
-–Oil recovery function
– Night (or Double set point) function management
– Compressor and pump working hours meter
– Discharge and suction pressure display
– Memorized alarms history
– 4 set point time programs
Possibility to connect:
– Serial Communication Card RS485: to connect the
Chiller Control
to a BMS (Carel or Modbus type)
– Remote Display Terminal
– Remote control
– Phase monitoring kit
– Black Box
I
“Chiller Control” system for SLS
two screw compressors unit
These cooling only water chillers are provided with a
microprocessor board having a default program for
the management of two refrigeration circuits each
one equipped with one twin screws compressor, one
low pressure transducer and one high pressure trans-
ducer. The control system consists of:
- INTERNAL ELECTRONIC PCB
- TERMINAL UNIT WITH DISPLAY AND KEYBOARD
- CHILLED FLUID TEMPERATURE SENSORS
- AMBIENT AIR TEMPERATURE SENSORS
- COIL TEMPERATURE SENSORS
- HIGH PRESSURE TRANSDUCER
- LOW PRESSURE TRANSDUCER
6.2 Keyboard – Display Terminal Unit
I
General Information
The figure which follows shows the terminal unit with
open access door.
On the figure it is possible to see the microprocessor
managed 4 lines – 20 columns LCD display, the key-
board and the LEDs which allow to program all the
control parameters as setpoints, differential band,
alarm thresholds and to perform the main functions.
Operation
I
Keyboard
The terminal unit allows the operator to perform the
following operations:
– initial configuration of the unit
– modification of the main working parameters
– displaying of the alarms and their notification by
“buzzer”
– displaying of all the measured parameters.
SLS1-en.qxp 29-06-2007 15:37 Pagina 22

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