7
CONDENSER FANS
Condenser fans, the impeller and motors are so constructed to form an integral unit. All fan motors shall be three phase
with class ''F'' winding insulation and ball bearings for high ambient application. These fan motors are of totally enclosed
air over type (TEAO) with inherent thermal protection of automatic reset type.
MICROPROCESSOR CONTROLLER
The microprocessor controller works on the state of art microprocessor technology. This controller monitors analog and
digital inputs to achieve precise control & safety functions of the unit.
The Software works on the Proportional Integral Derivative (PID) algorithm for precise control logic.
The simple to use push button keyboard allows accessing to the operating conditions, control set points & alarm history
that are clearly displayed on a multi-line back illuminated LCD panel.
An easy to install
serial port/modem option
allows remote monitoring of the operating parameters. With corresponding
windows software, the system allows data to be viewed in tabular or graphic format as well as interact with system set up.
This chiller controller is compatible with the Building Management System (BMS)
BACNET/MODBUS
protocols through
corresponding optional gateway interfaces.
It is also compatible with GSM protocol through GSM optional gateway that sends up to 3 mobile phone SMS messages
whenever alarm take place, indicating the type of alarm, the corresponding compressor, the related chiller and which
location.
The microprocessor consists of the following hardware:
1. User Interface Board: Provided with simple to use push button keyboard and menu driven software to access operat-
ing conditions, control set points & alarm history that are clearly displayed on the LCD panel.
2. Main Board: This controls up to two (2) compressor system.
3. Auxiliary Boards: Required for controlling an additional two (2) or more compressors.
4. Remote Monitoring System [Optional]: The micro controller is complete with all hardware and software necessary to
remotely monitor and control the chiller unit.
Display Information:
In the normal operating mode the 20 x 4 characters LCD panel display the system status, the temperature of the water
inlet & outlet, the set point, run time of the compressor & the alarm history.
Easily accessible measurements for each circuit include the following:
·
Suction and discharge temperatures
·
Suction, discharge and oil pressures
·
Water inlet/outlet temperatures
·
Compressor status
·
Fan status
·
Liquid line solenoid status
·
Unit/Compressor run time
The control temperature is continuously displayed on the 3 Digit 7 segments LED Display. The 3 LED lights indicate the
Power ON, Menu adjustment and Fault
.
System Protection:
The following system protection is provided to ensure system reliability:
·
compressor winding overheating
·
Low suction pressure
·
High discharge pressure
·
Freeze protection
·
Low oil pressure
·
Sensor error
·
Time delay – Anti recycle time for compressor
·
Serial communication error
