Consulting-Specifying Engineer - October 2008 - (Page 55)

CONSULTING – SPECIFYING ® Building Automation Controls Web-based BAS controller WebStat Controller from Honeywell International offers lower energy costs with economizer integration, 365-day scheduling, special event schedules, and room integration. The controller features motion detection inputs and time-of-day relay outputs. Remote monitoring and control of communicating thermostats is via a unique IP address, a Web browser, or Internet access. The trending and alarming features allow users to track temperature, humidity, discharge air temperature, and outdoor air temperature. www.webstathoneywell.com CONSULTING – SPECIFYING ® Wireless room controller Apogee Wireless v2 from Siemens ensures that wireless room temperature sensors are immune to signal interruption with redundant mesh networking technology. The wireless field-level network (WFLN) communicates with any radio on the WFLN and provides redundant communication paths back to its associated controller. The sensors feature an LCD that displays room temperature value, set point values, override condition, and diagnostic information. The sensors have a five-year battery life and can communicate wirelessly with room controllers when in range of any radio on the network. By eliminating the need for wiring, the controllers reduce field-level network and room temperature sensor installation time. The wireless controllers provide optimal sensing and control in areas that have no network wiring. www.usa.siemens.com/wireless CONSULTING – SPECIFYING ® IP BAS controllers Xenta 700 series of IP controllers from TAC directly connects to the Ethernet network in any building. The controllers communicate on standard IP networks and are accessible via standard Web browsers, which offer the operators instant access to correct all malfunctions that keep the indoor climate functioning efficiently. Using standard protocols on the IP network, such as HTTP, HTTPS, and FTP, installation is available to all networks with low bandwidth usage. The controller can work as a standalone unit for local operation, function with a number of controllers for several buildings, or connect to an enterprise-wide system. www.tac.com/us CONSULTING – SPECIFYING ® HVAC Temperature controller The digital precise air control system (D-PAC) from AAON controls both temperature and humidity with an energy-efficient rooftop unit. The controller consists of a digital scroll compressor, modulating hot gas reheat, and an economizer with three independently controlled sections: outside air, return air, and return air bypass. The system’s digital scroll compressor provides energy-efficient, load-matching temperature control. For load-matching humidity control, the system uses a combination of the digital scroll compressor, return air bypass, and modulating hot gas reheat. To control both temperature and humidity, a user must be able to vary both the cooling coil temperature and the reheat coil temperature. In a direct expansion refrigeration system, the most efficient way to modulate the cooling coil temperature is with a modulating capacity compressor. The controller’s modulating compressor and the modulating reheat combine to eliminate the temperature and humidity fluctuations associated with on-off style HVAC equipment. www.aaon.com CONSULTING – SPECIFYING ® Consulting-Specifying Engineer • OCTOBER 2008 55 http://www.webstathoneywell.com http://www.usa.siemens.com/wireless http://www.tac.com/us http://www.aaon.com

Table of Contents Feed for the Digital Edition of Consulting-Specifying Engineer - October 2008

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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