Assessments - 2, GPA: 4
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Facilidade de uso
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 heavy gauge steel cleanout plates to cover cleanout openings on the side of the boiler(s). • Port openings must be of captured seal design – a machined groove assures uniform compression of the sealing ring and protects the seal from contaminants. 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. • Provided with flexible refractory blankets attached to back and floor of combustion chamber. • 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 left hand side of the tankless intermediate (TI) section in the opening provided. Allow 34” minimum clearance on left side of boiler for cleaning and servicing. Tankless openings must be on same side as the flue passage cleanout plates to minimize space requirements. E. Boiler foundation(s): • Installer to construct needed support and level concrete foundation(s) where boiler room floor is uneven or will not support the weight of the boiler(s). F. Boiler trim: 1. All electrical components to be of high quality and bear the U.L. label. a) Water boiler(s) controls furnished: 1) Combination low temperature limit (operating) and high temperature limit control. 2) Low temperature limit set according to system design. High temperature limit set at least 20°F higher than the low limit (240°F is the maximum allowable water temperature). 3) Combination pressure-temperature gauge with dial clearly marked and easy to read. 4) ASME certified pressure relief valve, set to relieve at 30 PSIG. Optional relief valves available up to and including maximum allowable pressure. Side outlet discharge type; contractor to pipe outlet to floor drain or near floor, avoiding any area where freezing could occur. b) Steam boiler(s) standard controls furnished: 1) Low pressuretrol (operating) and high pressuretrol set at maximum pressure as a safety control. 2) Steam pressure gauge with dial clearly marked and easy to read. 3) Gauge cock water set with gauge glass, guards and aluminum water level plate. 4) ASME certified pressure relief valve, set to relieve at 15 PSIG. Side outlet discharge type; contractor to pipe outlet to floor drain or near floor, avoiding any area where freezing could occur. c) Low water cut-off for water or steam boiler(s): 1) Boiler(s) to be furnished with U.L. labeled low water cut-off with ASME working pressure rating equal to the ASME rating of the relief valve. 2) Do not use quick-connect fittings on boiler(s). 3) Install cut-off according to manufacturer’s instructions. 4) Locate so burner shuts down if boiler water level falls below allowable safe waterline (steam boilers, .” above bottom of gauge glass). 5) Steam boiler primary low water cut-off shall be a float type – auto reset. 6) Steam boiler secondary low water cut-off shall be a float type – manual reset. III. Burner(s) construction, features and requirements: 1. Burner fuel supply system and burner installation to conform to burner manufacturer’s installation instructions and applicable codes. 2. Burner motor characteristics: .. 120/60/1, .. 240/60/1, .. 208/60/3, .. 240/60/3, .. 480/60/3. 3. Control characteristics 120/60/1. 4. Burner fuel – natural gas 4.0” W.C. minimum, No. 2 fuel oil. 5. Code(s) - .. standard boiler, .. CSD-1, .. FM, .. IRI 6. Burner(s) to have U.L. label(s) supplied by the burner manufacturer. 7. Burner(s) designed to ensure high efficiency and good performance under forced draft conditions with 0.1” W.C. positive pressure at the flue collar. 8. Burner to be adjusted to provide 9.5 to 10.0% CO2 for gas and/or 11.5 to 12% CO2 with zero smoke for oil firing. 9. Burner(s) manufactured by: .. Power-Flame, .. Gordon-Piatt, .. Webster; 10. Burner operating mode: .. on-off, .. low-high-off, .. low-high-low, .. modulating A. Panel options – power on/fuel on light is standard on all burner(s) with panels. 1) Call For Heat 2) Ignition On 3) Pilot Failure 4) Low Water 5) Flame Failure 6) Silencing Switch 7) Control Fuse and Holder 8) Post Purge Timer 9) Alarm Bell B. Start-up and Service • The contractor shall obtain the services of a factory authorized agent to provide burner light-off and adjustment. The start-up agent shall provide a ...