The Chiller Control Units

By Anonymous -


The chiller control unit is the most important and complex electromechanical organ in the chiller system. It generates the cold temperatures for all of the connected chiller utilities and processing rooms.
The CAREL retail system was designed to meet all the builder’s needs and to provide the OEM and installers with the best response to their design efforts and to maximize results.
From simple hermetic compressors in limited numbers or in large racks, to semi-hermetic and hermetic ones that can be partialised or controlled in frequency.
In terms of energy savings, the chiller control unit allows wide maneuvering margins with its considerable installed power. All of our solutions were designed with the utmost attention to this aspect.
The use of E2V electronic expansion valves along with the power of the electronic controls allow the energy balance to be maximized.
Carel offers two platforms for managing chiller control units: µRack  and pRack.
The µRack series offers a series of compact parametric controllers, at a low cost and particularly easy to use and install on small systems with the following features:

  • High efficiency display for monitoring variables;

  • Mounting on DIN guide or panel and in KITs complete with accessories;

  • Clear and highly visible icons for operating conditions and any anomalies;

  • A PWM output for modulating condensation fan control through a speed regulator.

  • Operation with floating condensation pressure for increasing the efficiency and yield of the compressor unit.

  • Three levels of access for viewing and programming the parameters: (user, installer, builder), with the possibility of reassigning the parameters among various levels.

pRack is the ideal solution to meet the many needs of the market for control and management of more complex and advanced centralized chiller control units (i.e. CO2 refrigerant):

  • High number of inputs and outputs per control needed;

  • Innovative management algorithms for energy savings;

  • A unique regulation software in six languages, compatible with various hardware sizes and with a wide range of integration/supervision possibilities;

  • Possibility of separating the compressor controller with a unique user interface and local network connection between controllers.

  • Drastic reduction in electrical connection costs for remote fans.

  • Regulation of modulating capacity through dedicated outputs for compressor side inverter and/or inverter/cut-off controls for condensation fans.

  • Operation with floating condensation pressure for increase the efficiency and yield of the compressor unit.

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