Airwell VLS 704 [24/85] Control
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Airwell VLS 704 [24/85] Control

Airwell VLS 704 [24/85] Control
Page 23
English
CCoonnttrrooll
6 GENERAL INFORMATION
Introduction
This document contains the information and the
operating instructions for VLS-VLH-VLC 4 compres-
sors & electronic control.
This information is for the after-sales service and the
production operators, for the end-of-line testing.
Main Characteristics
– Microprocessor control
– User-friendly keyboard
– Proportional and integral control of the return
water temperature (RWT)
– Hysteresis control of the leaving water
temperature (LWT)
– Access code to enter the Manufacturer's Level
– Access code to enter the Assistance Level
– Alarm and LED
– Backlighted LCD
– Closed-loop condensing pressure control
– Pump-Down logic (start-stop)
– Rotation of the compressor operation
– Oil return function
– Night mode (or Low Noise) control
– Counting of the pump/compressors' hours of
operation
– Display and control of superheating by EEV
– Display of discharge and suction pressure values
– History of stored alarms (option)
– Programming of different setpoints with 4 ranges
of time/setpoint.
The following accessories can be also connected:
– Real Time Clock Memory Card: alarm history and
programming of different setpoints with ranges of
time
– Serial Communication RS485 Card; to connect
the Chiller Control to a BMS network
– Remote Display Terminal
– Wire Remote Control
6.1 Control of VLS-VLH-VLC
with 4 compressors.
The “CHILLER CONTROL” system
The VLS-VLH machines with 4 scroll compressors
are provided with a microprocessor card which is
fully programmed by default for the control of a
chiller of cold only type with 2 circuits, 2 com-
pressors per circuit, a high-pressure transducer
per circuit.
The control system consists of:
Keyboard & Display Terminal
General information
The figure shows the terminal with the front door
open.
It is provided with a LCD 4 lines x 20 columns, key-
board and microprocessor-controlled LED's, so as to
allow the programming of the control parameters
(setpoint, differential bands, alarm thresholds) and
themain operations to be carried out by the user.
Terminal & Key Board description
The terminal makes it possible to carry out the fol-
lowing operations:
– the initial configuration of the machine
– the change of all the main operating parameters
– the display of the detected alarms
– the display of all the measured quantities
The terminal and the card are connected by a 6-
way phone cable.
The connection of the terminal to the basic card is
not essential for the normal operation of the control-
ler.
VLS-eng.qxp 12-04-2007 14:43 Pagina 23

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