PROCESS COOLING: Modular Chillers with Scroll Compressors, Central Control from One Panel

With modular system, processors can start with one unit, expand later.

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Processors have the flexibility to start with one chiller and ultimately expand to a multiple-chiller system—operated by a single easy-to-use controller—with the ESE Series EarthSmart central chillers from Conair, Cranberry Township, Pa. 

These chillers are available with integrated pumps and fluid reservoir, or as a standalone chiller to supply a separate pump tank system. Systems can be water cooled, using tower water, or can be installed in a remote-air-cooled condenser configuration. The ESE series is available in 12 sizes, from 10 to 160 tons, with a single refrigeration circuit available on units from 10 to 80 tons in capacity and dual refrigeration circuits available from 20 to 160 tons. Each refrigeration circuit has two Copeland scroll compressors, enabling the system can stay up and running even if one of the compressors requires maintenance.

To meet immediate process requirements and allow for future expansion, users can install one or more ESE chillers and then add more modules up to a total of six for cooling capacity to 960 tons. All units—up to a total of 12 refrigeration circuits—can be connected to a single control interface using twisted-pair wiring, for centralized control of all chiller circuits

The standard Panasonic PLC control operates with proprietary programming developed specifically for the ESE chillers. The LCD touch-screen user interface allows for quick monitoring and control, using a clear, simple-to-understand display.

All circuits are controlled using readings from a common manifold-mounted temperature sensor to avoid the blending and temperature drift that can occur when individual supply and return sensors are used. Electronic expansion valves, instead of more conventional pressure-actuated valves, are used to compensate automatically for load variations and ambient conditions. The condenser-water regulating valve is electronic too.

Extensive temperature and pressure displays, trending screens and efficient diagnostic tools make it easy to commission and fine tune chillers for optimum plant efficiency. In fact, the system provides so much information that service and maintenance personnel typically do not need meters or gauges.