Airwell SWS 1602 HFС 407C [22/82] English
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Airwell SWS 1602 HFС 407C [22/82] English

Airwell SWS 2652 HFС 134a [22/82] English
Page 21
English
6 OPERATION
These chillers 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 Information
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 Card to con-
nect the
Chiller Control
to a BMS net (MODBUS,
LONWORK, BACNET)
– Remote Display Terminal
– Remote control
– Phase monitoring kit
– Killer Data Logger
– GSM Modem
I
“Chiller Control” system
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 compres-
sor, one low pressure transducer and one high pres-
sure transducer. The control system consists of:
-
INTERNAL ELECTRONIC PCB
-
TERMINAL UNIT WITH DISPLAY AND KEYBOARD
-
CHILLED FLUID TEMPERATURE SENSORS
-
AMBIENT AIR TEMPERATURE SENSORS
- COIL TEMPERATURE SENSOR
-
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
Manuale SWS-SWR EN1.qxp 05/11/06 14:18 Pagina 21

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