2 GENERAL DESCRIPTION
2.1 Basic Information
Microtech® III is a system for controlling single or dual-circuit air/water-cooled liquid chillers. Microtech® III controls
compressor start-up necessary to maintain the desired heat exchanger leaving water temperature. In each unit mode it
controls the operation of the condensers to maintain the proper condensation process in each circuit.
Safety devices are constantly monitored by Microtech® III to ensure their safe operation. Microtech® III also gives access
to a Test routine covering all inputs and outputs.
2.2 Abbreviations used
In this manual, the refrigeration circuits are called circuit #1 and circuit #2. The compressor in circuit #1 is labelled Cmp1.
The other in circuit #2 is labelled Cmp2. The following abbreviations are used:
Condenser Entering Water Temperature
Condenser Leaving Water Temperature
Condensing Saturated Refrigerant Temperature
Evaporator Entering Water Temperature
Evaporator Leaving Water Temperature
Evaporating Saturated Refrigerant Temperature
Electronic Expansion Valve
Maximum operating pressure
Unit controller (Microtech III)
2.3 Controller Operating Limits
Operation (IEC 721-3-3):
Temperature -40...+70 °C
Restriction LCD -20… +60 °C
Restriction Process-Bus -25….+70 °C
Humidity < 90 % r.h (no condensation)
Air pressure min. 700 hPa, corresponding to max. 3,000 m above sea level
Transport (IEC 721-3-2):
Temperature -40...+70 °C
Humidity < 95 % r.h (no condensation)
Air pressure min. 260 hPa, corresponding to max. 10,000 m above sea level.
2.4 Controller Architecture
The overall controller architecture is the following:
One MicroTech III main controller
I/O extensions as needed depending on the configuration of the unit
Communications interface(s) as selected
Peripheral Bus is used to connect I/O extensions to the main controller.
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