IOM SYSCREW 440 1550 WATER EVO

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6 - Control
6.1 General information
Introduction
This document contains the information and the operating instructions
for 1/2 screw compressors of step type.
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 control (RWT)
– Neutral zone control on 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
– Rotation of the compressor operation
– 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)
– RS485 serial port to connect the chiller control to a BMS network.
The following accessories can be also connected:
– Remote Display Terminal
– Wire Remote Control.
– Double set point.
The control system consists of:
a) Main Board. Units are provided with a microprocessor card
which is fully programmed by default for the control of a chiller
equipped with a HP transducer and a LP transducer for each
circuit.
b) EEV controllers (two separate drivers) to the management of the
electronic expansion valves.
C) Keyboard & Display Terminal.
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.