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Фрагмент инструкции
O. Smith VF Boiler model VW______ having an input rating of _______ BTU/hr and capable of supplying no less than ______ GPH at a 100°F temperature rise when fired with (Natural/Propane) gas. 1) The boiler shall bear the ASME “H” stamp and shall be National Board registered (CRN in Canada) for 160 PSI working pressure. 2) The boiler(s) shall be equipped with a factory-installed 125# PSIG ASME Pressure Relief Valve. 3) The boiler(s) shall be design-tested and certified to the ANSI Z21.13 standard and approved by CSA International. 4) Meet or exceed the SCAQMD Rule 1146.2 for low-NOx emissions and air quality standards. The heat exchanger shall: 1) Incorporate a vertical straight tube 2 pass copper fin tube heat exchanger design. 2) Be circular, encompassing the entire burner and forming the combustion chamber. 3) The tubes shall be rolled into ASME grade steel glass lined tube sheets. 4) The headers shall be ASME 160 psi welded glass lined steel. 5) For ease of service and access, headers shall be bolted and sealed to the tube sheets with silicone “O” rings, having a temperature rating of over 400°F. Tube access plugs are not acceptable. 6) To provide rust-resistant operation, all internal heat exchanger water contact surfaces shall be copper or glass lined steel. 7) The heat exchanger shall be immune to thermal shock. 8) All non-heating surface heat exchanger components (headers, tube sheets, header bolts and gaskets) shall be outside and away from the combustion and flue collection areas, only the copper fin tubes shall be exposed to the products of combustion. 9) The sealed heat exchanger flue collection system shall be constructed of AL29-4C stainless steel that is immune to corrosive flue gases. 10) The heat exchanger shall be approved for inlet water temperatures down to 120°F. 10) The entire heat exchanger shall carry a five (5) year warranty. Boiler Pump: 1) The hot water supply boiler(s) shall be supplied with a factory sized and wired all bronze circulating pump. 2) The pump shall be interfaced with and managed by the boiler’s control and cycled as needed for most efficient operation. Burner: 1)The gas burner shall be constructed of high temperature stainless steel and utilize a woven metal fiber mesh covering, be warranted for 5 years, and fire in a radial 360-degree flame pattern. 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 plai...
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