Network Condensing Unitswith Digital Modulationfor Multi-EvaporatorRefrigeration Systems
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Network Condensing Units with Digital Modulation for Multi-Evaporator Refrigeration Systems A Unique Concept for Refrigeration Applications

Emerson Climate Technologies is revolutionizing the commercial refrigeration sector with a groundbreaking concept never used before in condensing unit installations. The two outstanding features of this innovation are the capability to connect several units (minimum 2, maximum 4) in one single refrigerant loop (“Network”) and use Copeland Scroll Digital™ technology to provide modulation for distributed systems that have varying capacity requirements, for example a Network with 2 units has a range of 2.5% - 100% system capacity modulation. Refrigeration According to Emerson Climate...

This new concept is defined as “Digital Network” for applications with installed refrigeration capacities up to 90 kW for medium temperature and up to 56 kW for low temperature applications. Aiming for simplicity and speed above all, Emerson Climate Technologies has used technical innovation to reduce not only installation but also operating costs, resulting in complete mastery of energy consumption. Modularity, adaptability and reliability are the three pillars of the Digital Network. Perfect refrigeration capacity management is provided by Copeland EazyCool™ condensing units with Copeland...

Exceptional Modularity for All Types of Commercial Refrigeration Until now most refrigeration installations using standard technology consisted simply of one condensing unit connected to a single, remote evaporator. When installing a Copeland Eazycool™ Digital Network system the number and capacity of the evaporators connected to the refrigerant loop in no way constitute such a technical constraint. It is possible to combine condensing units with totally different capacities, as long as there are no more than four condensing units on any one circuit. A Master/Slave configuration should be...

This new condensing unit network concept has already been proven by winning prestigious industry awards where efficient, high-performance refrigeration of quality was required: large-scale catering (Sports Stadiums, National Health Service and private hospitals etc.), the food trade and other shops (bakers, butchers, fishmongers, florists) and small and medium-sized food businesses (seafood processing facilities, dairies, small warehouses etc.). Outdoor condensing unit for medium temperature / capacity per configuration - Optimized compressor and fan operating cycles Stand Alon - First in /...

At the Heart of the System: Copeland Scroll Digital™ Unique in the refrigeration market, the Copeland Scroll Digital™ compressor stands out through its flexibility of use for whenever a refrigeration installation requires perfect temperature stability and absolute control of evaporating pressure. In comparison with variable speed systems, whose complexity lies in the perfect determination of piping diameters, the design of installations with the Copeland Scroll Digital™ compressor has no such constraints. The technology used in Copeland Scroll Digital™ compressors eliminates the need for...

Low Consumption During Capacity Reduction The cycle time of the solenoid is one element in determining the compressor's energy consumption. When the compressor is working off load (solenoid open), its capacity never exceeds 10 % of the motor's nominal capacity. It is therefore evident that energy consumption will vary between 10 and 100 %, in proportion to the refrigeration capacity supplied by the compressor. Digital Scroll™ Modulation Mechanism Piston Small Bleed Hole Modulation Chamber Discharge Gas Passage Piston Joined to Upper Scroll Dynamic Discharge Valve - Flexible use - Stable...

Optimized Control Logic The advantage of this Network-based system lies in Copeland Scroll Digital™ compressor modulation which optimizes on/off compressor cycling of each Slave condensing unit. Example of Network with 2 units Scroll 02 Scroll 01 Digital The Emerson EC2 controller monitors the variations in suction pressure and modulates the Digital Scroll™ capacity accordingly. The Network system is modulated by the master controller based upon "First in / Last out" logic for Digital Scroll™ compressor of master unit and "First in / First out" logic for the Ramp Digital From 10~100% 25% of...

A Simple Yet Efficient Control Unit The control centre of a Network-based system is the Emerson EC2-551 controller installed in each condensing unit. It has all the logic required to ensure optimization of the installation when commissioned. Each unit can be set as Master or Slave, resulting in automatic self-detection of the operating priority selected during commissioning. Operating parameters are set Benefits: - Master/Slave mode regulation by simply defining temperature and/or pressure on the "Master" controller. As for the Slave unit controller, they follow the operating logic laid...

Absolute Simplicity of Oil Return and Maximum Reliability For centralized refrigeration installations with several compressors working in parallel, oil return is sometimes difficult to control completely, especially when the suction-gas velocity goes below a certain value, which is influenced by the pipes design (diameter & special configuration, vertical or horizontal). The same constraint is found on installations using compressors with variable-speed control. Benefits: - Simple connections using Schrader couplings - Total control of oil return - Identical oil separator on each unit -...

A Wide Range of Both Medium and Low Temperature Capacities Condensing Unit Network Oil Management System Oil level controller Traxoil OM3 Oil level controller Traxoil OM3 Flare oil connections (Mounting Series) Oil separator on each condensing unit Oil separator Oil inlet & outlet to Oil receiver (oil circuit) Oil receiver on master unit Oil level controller Traxoil OM3 Oil level controller Traxoil OM3 Oil injection to each compressor Condensing Unit Network Configurations Model Sound Pressure level Dba** 3 Units Network 4 Units Network Qo (kW) Qo (kW) Rating conditions: EN 13215 MT...