DUNGS VBS / VCW - Gas Venturi Meters (US/CA)

[{"filename":"vbs-vcw_manual_us_261487.pdf","text":"VBS and VCW\n Gas Venturi Flow USA CDN\n Metering Device\n Installation Instructions\n\n\n Table of Contents\n Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . Page 1\n Attention . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 1\n Gas Venturi Flow Metering Device . . . . . . . . . . Page 2\n Sizing a Venturi . . . . . . . . . . . . . . . . . . . . . . . . . . Page 3\n Screwed Brass Venturi (VBS) . . . . . . . . . . . . . . Page 3\n Screwed Brass Venturi (VBS) . . . . . . . . . . . . . . Page 4\n Carbon Steel Venturi (VCW) . . . . . . . . . . . . . . . Page 5\n Carbon Steel Venturi (VCW) . . . . . . . . . . . . . . . Page 6\n Correction Factor Calculation . . . . . . . . . . . . . Page 6\n Installation of VBS Venturi . . . . . . . . . . . . . . . . Page 7\n\n\n\n\n Attention\n The installation and maintenance Check the ratings in the speci-\n of this product must be done fications to make sure that they\n under the supervision of an ex- are suitable for your application.\n perienced and trained specialist.\n Never perform work if gas pres- [V] [A]\n sure or power is applied, or in [Hz] [VA]\n the presence of an open flame.\n\n Please read the instruction be- On completion of work on the gas\n fore installing or operating. Keep Safety venturi meter, perform a leakage\n the instruction in a safe place. You\n first and function test.\n\n\n O.K.\n find the instruction also at www.\n dungs.com If these instructions\n are not heeded, the result may\n be personal injury or damage to\n property.\n Any adjustment and application- This product is intended for\n specific adjustment values must IFGC installations covered by, but\n be made in accordance with the CSA not limited to, the following\n appliance-/boiler manufacturers UL codes and standards: NFPA 70,\n instructions. ANSI NFPA 86, CSD-1, ANSI Z21.13,\n NFPA\n\n\n\n\n MC • Karl Dungs, Inc. • VBS & VCW Gas Venturi Meters • Edition 2025.05 • P/N 261487\n UL 795, NFPA 85, or CSA B149.3.\n\n\n\n\n Explanation of symbols\n 1, 2, 3 ...\t = Action\t\t\n • = Instruction\n1…7\n\f Gas Venturi Flow Metering Device\n• Permits accurate setting of burner air and gas flow for • One piece machined brass connection\n optimum efficiency. • Includes brass hex-head screws to plug holes when mea-\n• Lower pressure loss than plate type orifices; can reduce surements are not being taken.\n blower horsepower requirements. • Metal tag chained to orifice clearly shows orifice pipe size\n• +/- 1 % accuracy depending on lacation, measurement and part number.\n accuracy and proper use of correction factors.\n\nScrewed Venturi’s (VBS) Pipe Size Overall Length\n• Available from 1/2” 2 3/4”\n 1/2” - 2 1/2” NPT 3/4” 3”\n• Rated for 250 PSI\n 1” 3 3/4”\n• Brass construction\n• Max. temperature 1 1/4” (500) 4”\n rating 300 °F 1 1/4” (616) 3 3/4”\n 1 1/2” (505) 4 1/4”\n 1 1/2” (632) 4”\n 2” (485) 5”\n 2” (685) 4 1/4”\n 2 1/2” (608) 5 1/2”\n 2 1/2” (750) 5 1/4”\n\nWelded Venturi’s (VCW) Pipe Size Overall Length\n• Available from 2 1/2” (628) 4 5/8”\n 2 1/2” - 30” NPT 2 1/2” (746) 4”\n• Rated for 250 PSI\n 3” (623) 5 1/4”\n• Zinc plated construction\n• Ends are chamfered for 3” (745) 4 1/4”\n buttwelding to pipes 4” (555) 5 7/8”\n• Max. temperature 4” (674) 5 3/8”\n rating 300 °F\n 5” 5”\n 6” 6”\n 8” 7”\n 10” 8”\n 12” 12”\n 14” 14”\n 16” 26”\n\n\n\n\n MC • Karl Dungs, Inc. • VBS & VCW Gas Venturi Meters • Edition 2025.05 • P/N 261487\n 18” 29”\n 20” 32”\n 24” 39”\n 30” 48”\n\n\n\n\n 2…7\n\f Sizing a Venturi\n • Use the tables on pages 2 and 3 for sizing a threaded orifice. • Select the orifice by either pressure drop or by flow. Apply\n…