IOM SyScroll 140 360 Air EVO 361549

30
6 - Control
6 General information
Introduction
This document contains the information and the operating instructions
for 4 compressors & 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 Service Level
– Alarm and LED
– Backlighted LCD
– Pump-Down logic
– Rotation of the compressor operation
– Oil return function
– Night mode (or Low Noise) control
– Counting of the pump/compressors’ hours of operation
– Display of discharge and suction pressure values
– Display of temperature sensor
– History of stored alarms (option)
– Built-in serial Communication RS485 Card; to connect the
“Chiller Control” to a BMS network
The following accessories can be also connected:
– Remote Display Terminal
– Wire Remote Control.
6.1 Control with 4 compressors. The “CHILLER
CONTROL” system
The 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 compressors 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 8 lines x 22 columns, keyboard 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 following 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 controller.