Appliance Design - September 2008 - (Page 14) NEwS watch part of the analysis to justify the proposed regulation. AHRI cited iced vent terminals as an example of a maintenancerelated issue that occurs on a 90 percent AFUE furnace that does not occur on an 80 percent AFUE furnace. The letter also pointed out that implementation of the CSA Natural Gas and Propane Installation Code provision requiring plastic vents be certified to ULC S636 has resulted in significant increases in the cost of plastic piping used to vent condensing furnaces. The group asked NRCan to reevaluate the installation costs used in the analysis for this regulation. AHRI also requested an exemption for “through the wall” furnaces because the implementation of the minimum 90 percent AFUE requirements to these models present distinct safety and reliability concerns due to space constraints that are part of the unique installation conditions of these furnaces. A final rule will be published prior to Dec. 31, 2009, when the amended regulation is scheduled to go into effect. NEwS watch with permanent-split-capacitor (PSC) motors have a 97 percent AFUE rating. In addition, all single-stage furnaces are now rated at 95.5 percent AFUE, eclipsing the previous rating of 95 percent AFUE on condensing furnaces. The furnaces were launched under the York, Coleman, and Luxaire brand names. ONtaRIO REcYcLING E-waStE. York Affinity 98 AFUE furnace. FURNacE hItS 98% aFUE. A new 33-in., variable-speed modulating gas furnace with electronically commutated motors that can achieve up to 98 percent AFUE has been developed by the Unitary Products division of Johnson Controls of Norman, Okla. Other modulating ECM models in the Unitary Products line go no lower than 97.5 percent AFUE. All of the company’s modulating gas furnaces The electronics and retail industries in Ontario, Canada, are getting ready to implement a “3Rs” waste diversion plan for computers, TVs, and other electronics as part of the government’s Waste Electrical and Electronic Equipment (WEEE) standard. The Ontario Electronic Stewardship (OES), an industry organization, has developed a plan to divert 17,000 tons of electronics in the first year of the program. At the end of five years, the target recovery is 75,000 tons, or 60 percent of the amount of electronic waste annually generated. OES’ first priority will be to promote its 3Rs — reduce, Allegro’s Integrated Current Sensing Solutions Low-Noise, Shielded Hall-Effect Current Sensor The Allegro ACS712 is a fully integrated, Hall-effect-based linear current sensor with 2.1 kVRMS voltage isolation and a low resistance current conductor. It offers a non-intrusive means of measuring both high and low-side currents in a variety of applications including circuit protection, motor control, and power monitoring. The ACS712 output voltage is proportional to the current flowing through the conductor internal to the SOIC8 package body. The device also includes an electrostatic shield that covers the active circuit area of the Hall-effect IC. This shield results in a stable voltage output even when measuring the current through inductive loads. Features � � Low noise and high gain offerings (up to 185 mV/A) - Provides excellent low current accuracy Galvanic isolation from primary current path to all other pins Simplifies high-side current sensing designs � � � Low resistance primary current path - Low power loss and reduced ohmic heating High bandwidth and fast response time - Suitable for overcurrent protection applications Integrated electrostatic shield Superior dV/dt transient immunity from primary current path to device output pin www.allegromicro.com/promo389 115 Northeast Cutoff, Worcester, MA 01606 USA � 508.853.5000 High-Performance Power ICs and Hall-Effect Sensors 14 applianceDESIGN AD06084Allegro.indd 1 September 2008 www.applianceDESIGN.com 5/13/08 11:43:05 AM http://www.allegromicro.com/promo389 http://www.appliancedesign.com
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