Assessments - 2, GPA: 4
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2) The burner shall be capable of infinitely modulating between 25% and 100% fire (4:1 turndown) with smooth starts and clean combustion. Boiler Controls: 1) All electrical boiler functions shall be controlled, operated, and monitored by a microprocessor-based control. 2) The microprocessor shall control and modulate the burner based on current system output requirements to maintain the boiler set point temperature and be accurate to within plus or minus 1°F. 3) The hot surface ignition system shall employ a separate flame sensor for maximum reliability. 4) The boiler control shall provide on board diagnostics with digital singular fault code read outs in plain English and help screens for additional troubleshooting assistance if needed. 5) The boiler shall be supplied with a remote tank thermistor for sensing and controlling the hot water storage tank temperature up to 1,000 feet away. 6) Provisions for connecting a remote thermistor, alarm bell, and alternate temperature controller must be provided. 7) Factory mounted and wired flow switch, blower prover, and blocked flue switches shall be provided. 8) The gas train shall meet or exceed the requirements of ANSI Z21.13 and include gas pressure regulator, manual gas cock, redundant safety gas valve, operating control valve, and plugged pressure test tapings. 9) The ASME rated pressure relief shall be factory installed. Venting: 1) The boiler shall be certified for direct horizontal through-the-wall venting or direct vertical venting; in addition to sidewall or conventional vertical venting. 2) The boiler shall be capable of horizontal sidewall or direct venting up to 70 equivalent feet without the aid of any optional sidewalll vent fans or blowers. Factory Start-up: 1) The boiler manufacturer must supply complete factory start-up by a factory approved start-up agent. The boiler shall comply with ASHRAE/IESNA 90.1-1999 standards. For Technical Information and Automated Fax Service, call 800-527-1953. A. O. Smith reserves the right to make product changes or improvements without prior notice. 500 Tennessee Waltz Pkwy, Ashland City, TN 37015 ©2007 A. O. Smith Corporation Printed in U.S.A. ACGSS02307 Page 4 of 4 ...
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