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O. Smith July 2011R GW/GWO-300 THROUGH GW/GWO-750 PG 1 OF 4 AOSDG25200 Commercial Gas Boilers GW SERIES INDOOR MODELS GWO SERIES OUTDOOR MODELS PG 2 OF 4 MODEL NUMBER BTU INPUT PER HOUR DIMENSIONS IN INCHES EXHAUST VENT AIR INLET WATER CONN. GAS PIPE (SEE DRAWINGS ABOVE) WIDTH A B C GW SERIES INDOOR MODELS GW-300 300,000 5 5 1-1/2 3/4 29-1/2 14-13/16 9 12 GW-400 399,900 6 6 1-1/2 1 35-3/4 17-15/16 9 14-3/4 GW-500 500,000 6 6 2 1 42 21-1/16 9 14-3/4 GW-650 650,000 8 8 2 1-1/4 51-3/8 25-3/4 9 14-3/4 GW-750 750,000 8 8 2 1-1/4 57-3/8 28-7/8 9 17-1/4 GWO SERIES OUTDOOR MODELS GW-300 300,000 --1-1/2 3/4 -49 24-3/16 - GW-400 400,900 --1-1/2 1 -55-1/4 24-3/16 - GW-500 500,000 --2 1 -61-1/2 24-3/16 - GW-650 650,000 --2 1-1/4 -70-7/8 -27-11/16 GW-750 750,000 --2 1-1/4 -77-1/8 -27-11/16 July 2011R AOSDG25200 Commercial Gas Boilers OTHER GENESIS® FEATURES GENESIS® VENTING VERSATILITY FACTORY-INSTALLED CIRCULATING PUMP DIRECT-VENTING Pre-wired, integrally controlled by EMC-5000 control Adjustable pump time delay allows removal of usable residual heat during stand-by cycle, virtually eliminating stand-by heat loss ASME PRESSURE RELIEF VALVE 125# FACTORY INSTALLED FLOW SWITCH ALTERNATE THERMOSTAT TERMINALS (24V) MANUAL RESET HIGH LIMIT BLOCKED FLUE SWITCH BLOCKED INLET SWITCH AIR PROVING SWITCH GENESIS® OPTIONS CSD-1 CODE NEW YORK CODE CALIFORNIA CODE ALARM BELL ALL-BRONZE CIRCULATING PUMP HARD WATER PUMP BRONZE HEADERS STACK RACK LOW WATER CUT-OFF EXTENDED VENTING KIT SEQUENCING CONTROL PANEL (FOR 2-8 BOILERS) COMBUSTIBLE FLOOR SHIELD DRY CONTACTS FOR ANY BOILER FAILURE CUPRO-NICKEL HEAT EXCHANGER CSA CERTIFIED VENT KIT SIDEWALL VENTING CONVENTIONAL VENTING For the most current Genesis venting distances/information, consult the Genesis Product Manual, available through your local A. O. Smith representative, or online at MODEL BTU INPUT RECOVERY — GALLONS PER HOUR AT °F TEMPERATURE RISE NUMBER PER HOUR 40° 50° 60° 70° 80° 90° 100° 110° 120° 130° 140° GW/GWO-300 300,000 761 609 507 435 380 338 304 277 254 234 217 GW/GWO-400 399,900 1014 811 676 580 507 451 406 369 338 312 290 GW/GWO-500 500,000 1268 1015 845 725 634 564 507 461 423 390 362 GW/GWO-650 650,000 1649 1319 1099 942 824 733 659 600 600 507 471 GW/GWO-750 750,000 1902 1522 1268 1087 951 845 761 692 634 585 544 Gas Supply Pressure: 13.8” W.C. maximum natural and propane; 4.5” W.C. minimum natural; 11.0” W.C. minimum propane. Genesis boilers are approved for installation on noncombustible flooring in an alcove with minimum clearance to combustibles of: 3 inches sides, and back; 3 inches top, front alcove; 6 inches vent. For installation on combustible flooring use the optional Combustible Floor Kit. Genesis boilers must be connected to a single phase dedicated line source that is: 120 volts, 60 hertz and 20 amps. July 2011R PG 3 OF 4 AOSDG25200 Commercial Gas Boilers SUGGESTED SPECIFICATION The hot water supply boiler(s) shall be an A. O. Smith Genesis...

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