Consulting-Specifying Engineer - October 2008 - (Page 56)

CONSULTING – SPECIFYING ® Scroll chillers York Tempo air-cooled scroll chillers from Johnson Controls provide low energy consumption, no ozone depletion, and qualification for a LEED point. With an integrated part-load value as high as 16.0 EER, the chillers are available from 70 to 150 TR. The chillers use HFC-410A, zero ozone-depletion refrigerants that employ an advanced refrigerant-circuit design that requires 30% to 50% less refrigerant than other models. Designed for outdoor installation on a roof or ground level, the chillers have corrosion-resistant coils that help extend operating life. www.york.com CONSULTING – SPECIFYING ® Condensing boilers AERCO’s Modulex line of condensing boilers enhances communications and supports integration with BAS. Each unit in the 300,000 to 1 million Btu/hr line is equipped with a boiler communications module. Approved by CSA for propane installations and breech venting of multiple units, each boiler combines between two and seven independent, 151,500 Btu/hr, preassembled thermal modules housed in a common enclosure. Each module features a dedicated controller with a combustion safeguard, variable-speed fan, modulating gas valve, electronic ignition, modulating burner, flow temperature sensor, thermostat, and heat exchanger. The independent operation of two or more thermal modules increases each boiler’s turndown range—up to 23:1—while also increasing the boiler’s overall reliability. In the event that one module is not working correctly, the remaining modules will continue to operate, thereby delivering built-in redundancy to single boiler installations. In addition to minimizing the redundant capacity needed for any project, the boilers support low NOx, low gas pressure applications, and PVC venting materials. Each unit enclosure offers multiple supply/return piping and venting locations for installation flexibility. www.aerco.com CONSULTING – SPECIFYING ® Motors, Starters, Drives Drive controller The Square D brand S-Flex enclosed drive controller from Schneider Electric provides a solution for commercial pump and fan applications. The drive controller features a simple start-up including preprogrammed parameters, and installation with EZ-M mounting, conduit knockouts on the enclosure, and a dedicated wiring terminal block. The Windowsbased PCSoft software allows users to adjust parameters, transfer drive configuration files, monitor driver performance—including historical data—and configure, adjust, and control remotely. The controller is available in two horsepower ranges, 1 to 40 hp at 208 V and 1 to 100 hp at 460 V. The reduced harmonics technology offers an optimized power section and a motor control algorithm that reduces harmonic currents without the use of additional harmonics reduction components such as line reactors or dc chokes. This results in reduced equipment cost, higher equipment efficiency, fewer points of electrical failure, lighter weight, and a smaller enclosure size. The internal Proportional-Integral-Derivative (PID) feedback function allows for accurate flow rate adjustment based on actual system needs by calculating the error between the setpoint and feedback for a closed loop system. The controller then applies an appropriate feedback reference to adjust motor speed. www.us.squared.com CONSULTING – SPECIFYING ® 56 Consulting-Specifying Engineer • OCTOBER 2008 http://www.york.com http://www.aerco.com http://www.us.squared.com

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Consulting-Specifying Engineer - October 2008 Contents Viewpoint Letters News M/E Roundtable Cities Under One Roof Eight Design Tips for Integration Is 'Green' Really New? Down the Drain Product of the Year Awards Codes & Standards Case Study New Products Equipment Lifecycles Advertiser Index Green Space

Consulting-Specifying Engineer - October 2008

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