Évaluations - 3, GPA: 3.3
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Facilité d'utilisation
Furnish and install ( ) low pressure, wet base, cast iron sectional boiler(s) with power burner(s) that pressurize the firebox and operate under forced and balanced draft. B. Assemble and install boiler-burner unit(s) in compliance with manufacturers installation instructions. All work must be done in a neat and workman like manner. C. Weil-McLain (P)(A)(B) L, (P)(A)(B) G, (P)(A)(B) GL- ( )94-(W) (S)F boiler(s) with burner(s) capable of burning natural gas at ( )” W.C. inlet pressure and/or No. 2 fuel oil. 1. (B) Boiler-burner unit Field assembled (standard). 2. (A) Boiler-burner unit with factory assembled sections (to size 21 only). 3. (P) Boiler-burner unit completely packaged and fire tested (to size 21 only). 4. Natural gas fired and/or No. 2 fuel oil. 5. Water or steam. 6. Forced or balanced draft. D. Boiler(s) shall have I=B=R Hydronics Institute gross output(s) at 100% firing rate – ( ) MBH per boiler. E. Boiler(s) shall be manufactured by ISO 9001 registered company to conform to Section IV of the ASME Boiler and Pressure Vessel Code. 1. Individual sections (and section assembly) to be hydrostatically pressure tested at factory in accordance with ASME requirements. 2. Maximum allowable working pressure 50 PSIG water and 15 PSIG steam cast as part of section with ASME symbol (Water only: optional 80 PSIG stamped in section in place of 50 PSIG). F. Regulatory Requirements 1. Boiler(s) and controls to comply with applicable regulations. 2. Provide UL labeled burner(s). 3. Provide add option for local code(s) ie: MASS Code BAR G. Submittals 1. Submit shop drawings and product data. 2. Submittal packet to include boiler (and burner) manufacturer descriptive literature, installation instructions, operating instructions, and maintenance instructions. II. Product A. Acceptable boiler/burner manufacturer(s) include(s): 1.Weil-McLain only, as specified in Part 1, Paragraph C. 1 2. Other manufacturer(s) or other Weil-McLain boiler(s) must comply with specifying engineer’s requirements, including: a) Full intent of these specifications, and provide complete submittal including literature, wiring diagrams, fuel piping diagrams, and a list of similar installations. b) Submittal to be presented to specifying engineer at least seven working days for approval before bid opening. Substitutions are not permitted after contract is awarded. c) Burner(s) and Energy Management Control System(s) must be tested and approved for installation with specified boiler by boiler manufacturer. B. Boiler construction • Boiler sections • Assembled with short, individual draw rods. • Cast with sealing grooves for high temperature sealing rope to assure permanent gas-tight seal. • Sealed water-tight by elastomer sealing rings, not cast iron nipples. Each port opening is machined to completely capture sealing ring between sections. • Must be hydro-wall design to provide completely water-cooled combustion chamber. • Provided with sufficient tappings to install required controls. • Limited 10 year warranty against workmanship and defects to be in writing by manufacturer. C. Boiler(s) • Provided with cast-in air elimination to separate air from circulating water. • Provided with expansion tank tapping to divert separated air to expansion tank. • Constructed to provide balanced water flow through entire section assembly using single supply and return connections for water. No external headers are necessary for water. Steam requires an external header 24” minimum from the waterline to the bottom of the header. • Designed with a low silhouette to provide maximum headroom. • Furnished with insulated burner mounting plate having necessary holes and tappings to mount burner. High temperature sealing rope is used to provide permanent gas-tight seal between front section and plate. • Furnished with two observation ports (one in front and one in back) to allow visual inspection of the flame. • Provided with cast iron flue collar with a built-in adjustable damper capable of being locked into place after adjustment. • High temperature sealing rope used to provide permanent gas-tight seal between hood and section assembly. • Furnished with cast iron cleanout plates to cover cleanout openings on the front of the boiler(s). • Elastomer sealing rings are to be used to provide permanent water-tight seal between sections. Unlike cast iron or steel push nipples, the elasticity of the seals fills any gaps caused by misalignment or expansion or contraction. 2 • Shipped with insulated heavy gauge steel jacket(s) with durable powdered paint enamel finish. Jacket designed to be installed after connecting supply and return piping. D. Tankless heaters or indirect water heaters • Provide ( ) internal tankless water heater(s) inserted into the right hand side of the tankless intermediate (TI) section in the opening provided. Allow 44” minimum clearance on right side of boiler for cleaning and servicing. Tankless openings must be on same side as the flue passage cle...