A.O. Smith DB-720 Brochure
Contents
1. ON OFF ps Baia SSS I R wadi of Pari LX A A ALR OT ie aN a E Minimum Clearances To Combustibles In Inches MM Water Blank Top Side Side Rear Vent Front All Models 12 305 12 305 6 152 6 152 6 152 Additional clearances for service is recommended ALL DIMENSIONS IN INCHES MM Cabinet Water Water Height To Depth To Water Pressure Flue Depth To Height To Width Depth Height Inlet Outlet Gas Inlet Gas Inlet Inlet Outlet Relief Size Flue Center Inlet Outlet Width A B E F H J L M N P Q DB 720 46 1 2 295 8 54 3 4 151 2 17 1 4 4114 2 1 12 15 1 2 32 1 2 34 1 2 780 1184 752 1391 394 438 108 51 25 305 394 826 876 354 DB 840 523 16 29 5 8 54 3 4 1651 2 17 1 4 4114 2 1 14 16 1 2 32 1 2 403 16 950 1326 752 1391 394 438 108 51 25 356 419 826 1021 431 DB 960 57 3 4 29 5 8 54 3 4 1 1 3 4 151 2 17 1 4 4114 2 1 14 16 1 2 32 1 2 42 3 4 950 1467 752 1391 32 197 394 438 108 51 25 356 419 826 1086 431 DB 1080 52 7 8 32 3 4 58 18 1 2 189 16 4 21 2 11 4 16 17 1 4 3015 16 40 7 8 1 000 1343 832 1473 0 472 102 64 32 406 438 786 1038 454 6 0 7 5 8 1 47 32 3 18 9 16 4 21 2 41 4 1 17 1 4 30 15 16 461 2 1486 832 1473 470 64 406 438 1481 465 DB 1350 64 1 2 32 3 58 81 2 189 16 4 21 2 11 4 18 12. 7 1 4 3015 16 52 1 2 1 100 ee tse ero ura 1330 8 7 DB 1480 6911 2 3 60 1 2 18 1 2 19 1 8 41 2 2 1 2 11 4 1 13 3 4 31 57 1 2 1 125 1765 864 1537 470 486 114 64 32 457 349 787 1461 510 1 1905 864 1537 470 486 114 64 32 457 349 787 _ 1600 _ 622 DB 1810 82 1 2 60 1 2 712 182 1918 41 2 21 2 114 20 13 4 31 701 2 1 250 Sao 864 1537 561 191 470 64 32 e 787 1791 567 Gas supply pressure 13 8 w c maximum 5 5 w c minimum Natural gas only Electrical requirements 120 VAC 15 Amps BOILER RATE OF FLOW AND PRESSURE DROP Head Head Eon Head Loss Loss Flow Loss Model meters Ips meters Number ego e 48 s 21 35 15 se 242 37 115 28 o69 960 NOTE Pressure drop shown is the loss through the boiler only and does not include any additional piping SUGGESTED SPECIFICATIONS Hydronic boiler shall be A O Smith Dura Max model DB with an input rating of BTU Hr KW and having an output rating of BTU Hr KW The boiler shall be design certified by the American and Canadian Gas Associations and shall carry the ASME H Symbol The wet section shall be design registered in accordance with the requirements of the ASME Code and shall carry an appropriate National Board Number or Canadian Registration Number All internal waterways shall be copper brass or bronze The heat exchan
3. A SWOT Meets or exceeds ASHRAE IES 90 1b 1989 1992 requirements Standards FEATURES ALL NON FERROUS WATERWAYS All heat exchanger waterways are 100 copper and bronze Heavy duty bronze castings and copper heat exchanger tubes Immune to thermal shock Ideal for hydronic applications OPTIMUM ENERGY HEAT TRANSFER Double row integral finned copper heat exchanger provides maximum heat transfer A O Smith s self baffling staggered tube design assures up to 82 thermal efficiency BRONZE REMOVABLE RETURN BENDS Easily removable these allow access and inspection of individual tubes These bronze return bends offer the optimum protection against corrosion or rust found in cast iron headers GASKETLESS WET SECTION Unique o ring design compresses and forms a water tight seal outside and away from the combustion chamber This isolation allows for years of trouble free service without gasket leaks DURAMAX STAINLESS STEEL BURNERS Reliable safe and quiet Protects against corrosion and deterioration found with aluminized burners Easy slide out burner tray LOW PROFILE DESIGN Draft diverter is built in to provide extra clearances for those tight retrofit applications Certified by A G A C G A AUTOMATIC SAFE CONTROLS Highest quality controls assure dependable operation require practically no attention Safety shutoff of pilot and main burners in the event of pilot failure INTERMITTENT IGNITION St
4. SME rated pressure relief valve and factory installed flow switch The boiler shall comply with the latest edition of ASHRAE IES 90 1b 1989 1992 requirements Standards Optional Factory installed dial type temperature and pressure gauges shall be mounted on the front of the cabinet Side Wall Vent Hoods Dura Max Side Wall Venting Part Dimensions in Inches mm Number ees ee VENTILATION 8 20 AIR VENT 280mm 203mm 508mm 6526 1 11 1 2 10 20 C ee Side View Rear View Paos 8 Bo 7 Power Venter Dimensions Part Dimensions in Inches mm ee eS aaa a ae COMBUSTION 6551 1 8 14 3 4 15 1 4 AIR VENT ka 203mm 375mm 387 mm 6551 2 10 f 18 16 1 2 ii cna END VIEW Equivalent Length Elbow 90 Degree 10 3m Elbow 45 Degree 5 1 5m Dimensions in Inches Millimeters Side Wall Vent Pipe Size Outlet Size Part e 152mm Vent Length 50 15 25m 16 406mm 6551 1 Maximum NR 40 tamy 100 05m NR DB 1210 16 406mm 8526 1 Equivalent WR 00 05m nR NR NR IR NR IR R NR Q B 121 N R 65261 Fectot NR Pipe NR 6526 1 pa t810 20 608mm 6551 2 6526 1 700 305m N R Not Recommended i A O Smith Enterprises Ltd El Paso Texas A O Smith Water Products Co Inc On Line Water Products Company McBee South Carolina www hotwater com A Subsidiary of A O Smith Corporation Seattle Washington Stratford Ont
5. andard on all Dura Max COMPACT DESIGN This rugged unit incorporates a clean compact jacket design Allows for easy access and disassembly Cool to the touch Approved for combustible floor installations Gas train is enclosed inside the cabinet OTHER FEATURES e Manual reset high limit ASME rated pressure relief valve 50 345 kPa Factory installed safety flow switch Redundant safety gas valve On Off switch with indicator light OPTIONS Thermal Balancer Pump Delay Panel mounted inlet outlet dial thermometers and pressure gauge Modulation or dual stage firing e Right end gas and or water connections Cupro Nickel Heat Exchanger Side Wall Vent Kits CERTIFICATION A G A C G A FM ASME 160 psi 1100 kPa Built tough with maximum efficiency COPPER HEAT EXCHANGER HYDRONIC BOILERS Models DB 720 thru 1810 A DAKE ae APPROVED APPROVED LIMITED WARRANTY OUTLINE lf the heat exchanger should fail within 10 years under the terms of the warranty A O Smith will furnish a replacement part installation labor handling and local delivery extra THIS OUTLINE IS NOT A WARRANTY For complete information consult the written warranty or A O Smith Water Products Company Warranty does not apply to product installed outside of the United States of America or its territorial possessions and Canada a J NPT E ae paien d A b 7 tg JAN Dp
6. ario Veldhoven The Netherlands For Technical Information Phone 800 265 8520 A O Smith Corporation reserves the right to make product changes or improvements at any time without notice
7. ger shall be a two 2 pass design incorporating integral fin copper tubes The double row heat exchanger shall have staggered tubes Cast bronze return bends shall be readily removable to permit visual inspection or cleaning without removing the entire wet section assembly Silicone O ring gaskets shall form a water tight seal by compres sion and shall be isolated from the flue gasses by 3 4 2cm board type ceramic fiber insulation The heat exchanger assembly shall be hydrostatically tested to a pressure of 240 psi 1655 kPa and shall have a maximum working pressure of 160 psi 1100 kPa The Combustion Chamber shall be constructed of board type ceramic fiber insulation rated to 2300 F 1260 C which interlock to form a gas tight seal and shall be supported in a heavy gauge corrugated steel frame The external cabinet shall incorporate a built in draft hood and shall be of baked enamel steel construction It shall be suitable for installation on combustible flooring The burners shall be a stainless steel stamped design and shall be mounted in a removable drawer assembly The burner controls shall be 24 VAC and shall include slow opening main gas valve for soft ignition redundant safety shutoff gas valve main and pilot pressure regulators recycling intermittent pilot system with one second shutdown in the event of pilot flame failure automatic recycling high limit manual reset ECO limit main and pilot manual cocks manual firing valve an A
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