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Air and Water cooled inverter chillers and heat pump
EWAD TZ - EWAD TZ B - EWWD VZ
Air and Water cooled inverter chillers
and heat pump
D-EOMZC00105-17EN
Operation Manual
13/84
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 condensing devices 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. All Microtech® III controls can work in
accordance with three independent modes:
Local mode: the machine is controlled by commands from the user interface.
Remote mode: the machine is controlled by remote contacts (volt-free contacts).
Network mode: the machine is controlled by commands from a BAS system. In this case, a data communication
cable is used to connect the unit to the BAS.
When the Microtech® III system operates autonomously (Local or Remote mode) it retains all of its own control
capabilities but does not offer any of the features of the Network mode. In this case monitoring of the unit
operational data is still allowed.
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:
A/C
Air Cooled
CEWT
Condenser Entering Water Temperature
CLWT
Condenser Leaving Water Temperature
CP
Condensing Pressure
CSRT
Condensing Saturated Refrigerant Temperature
DSH
Discharge Superheat
DT
Discharge Temperature
E/M
Energy Meter Module
EEWT
Evaporator Entering Water Temperature
ELWT
Evaporator Leaving Water Temperature
EP
Evaporating Pressure
ESRT
Evaporating Saturated Refrigerant Temperature
EXV
Electronic Expansion Valve
HMI
Human Machine Interface
MOP
Maximum operating pressure
SSH
Suction SuperHeat
ST
Suction Temperature
UC
Unit controller (Microtech III)
W/C
Water Cooled
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)