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1 Introduction
"µchiller" is a Carel's regulator that integrates into just one case all the control functions required by an air-conditioning unit.
"µchiller" is a complete, reliable and solid instrument. Thanks to its modular structure it provides a wide range of flexible
applications.
"µchiller" has been specifically designed to control and regulate air/air units (also air-conditioning unit with two heating steps,
two cooling steps and dead zone), chillers and chillers with single-compressor heat pump, single-compressor units with one
capacity controlled routine or two-compressor units. Regulation of condensation fans can be either temperature or pressure
based, with ON/OFF regulation mode or with continuous rotation speed variation.
Today using "µchiller", can be even easier thanks to the remote control unit that allows to easily and quickly select all the
operating parameters. The µchiller control board can be entirely programmed for specific uses by means of a programmable
and removable 'hardware key' to allow easy and rapid on-site operations.
For Customers requiring absolute security, "µchiller" can be connected with a removable User Interface. Since the regulator
includes two different, separate parts - User Interface and power section - it is now possible to take away the User Interface
once the unit has been programmed, so as to prevent unauthorized access to the selected parameters.
The additional use of an optional electronic serial card makes it possible to be linked to a centralized computer so as to
obtain remote supervisory and/or telemaintenance services.
2 General Description
2.1 Functions
"µchiller" is a multi-processor system designed for the control of:
• air/water chillers
• air/water heat pumps
• water/water chillers
• water/water heat pumps with gas reversibility
• water/water motoevaporating units
"µchiller" is based on two integrated systems (the 'Base' section including controller, inputs and outputs, and the terminal
section with User Interface functions). The Base and Terminal components can be enhanced by adding optional boards
allowing further auxiliary functions.
2.2 Main Board
The main board represents the core of the system, where the signals coming from the probes are processed. The modular
structure of the microprocessor board allows to get great flexibility and high performance. The compressor board can be
upgraded by adding a module for the regulation of the capacity-controlled routine of the compressor or for the management
of a second circuit and compressor.
On this board you can locate clockwise the following connection "areas":
•
G and G0 terminals for power source connection (24Vac)
•
analog inputs (from B1 to B3) for probe connection
•
24V terminal (with D.C.) for the supply of pressure probes
•
digital inputs (from ID1 to ID7) for alarm connection
•
jumper connector for expansion board connection
•
digital relay outputs to manage any controlled device
•
the Y1 GND analog output for the connection of the optional boards
for the management of condensation fans (ON/OFF regulation mode
or with continuous rotation speed variation)
•
telephone connector for user terminal connection
RG66000889-REV.00
3
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