A. O. Smith GB-650 User Manual
®
o
Hydronic Heating Boilers
84% EFFICIENT, LOW-NOX HYDRONIC HEATING
BOILERS
A. O. Smith Genesis® boilers offer everything you could ask for in a non-condensing boiler. They
provide the highest possible 84% thermal efficiency, outstanding venting flexibility, space-saving
stackable design and a new, advanced Energy Management Control (EMC) system. Genesis
models are available for installation indoors (GB Series) or outdoors (GBO Series).
ADVANCED ELECTRONIC CONTROL
Controls every electrical boiler function, including pump
operation and main burner ignition, delivers precise temperature
management, with ±1º accuracy
Display panel shows current operating status and fault
readings in easy-to-understand English instead of
confusing numeric codes
Display also shows temperature setpoints, outlet
temperature, current inlet/outlet differential (ΔT) and
tank temperature
Help screens assist in boiler setup and explain control
options
Includes 120V terminals for installation of secondary pump
up to 1/3 HP – allows control to cycle secondary pump for maximum
efficiency, virtually eliminates standby heat loss at the boiler
iCOMM™ Compatible and can be monitored from remote locations.
CALL 1.888.WATER02 for more information
pump
ise
ntrol options
ary pump up to
GB/GBO-300
THROUGH
GB/GB0-750
Shown with optional
factory mounted
TWO-STAGE GAS FIRING SYSTEM
Twin gas valve firing system ensures smooth operation,
saves fuel and extends boiler life
Prevents short cycling during low demand periods, delivers maximum
output when demand is high
LOW-NOX OPERATION
COPPER FINNED-TUBE HEAT EXCHANGER
Designed for maximum durability and serviceability
Copper is lightweight for easier handling and immune to thermal shock
Removable headers allow easy inspection of waterways
SPACE-SAVING DESIGN
Smaller footprint versus other horizontal copper fin-tube boilers
One unit can be stacked on top of another, doubling output with no increase in floor
footprint with optional stack rack
COMPLIANCE
Meets or exceeds the thermal effi ciency and standby loss requirements of the U.S.
Department of Energy and current edition ASHRAE/IESNA 90.1
ASME
TEN-YEAR HEAT EXCHANGER LIMITED WARRANTY
For complete information, consult written warranty or contact A. O. Smith
May 2011R
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®
e
Hydronic Heating Boilers
84% EFFICIENT, LOW-NOx HYDRONIC HEATING BOILERS
OTHER GENESIS® FEATURES
ASME Pressure Relief Valve 50#
Factory Installed Flow Switch
Alternate Thermostat Terminals (24v)
Manual Reset High Limit
Blocked Flue Switch
Fan Proving Switch
Adjustable Secondary Pump Delay
GENESIS® OPTIONS
❑ Factory Mounted And Wired
Secondary Boiler Pump For Primary
Secondary Piping Systems
❑ I.R.I. Code (500,000,650,000, 750,000BTU)
❑ CSD-1 Code
❑ New York Code
❑ California Code
❑ Alarm Bell
❑ Dry Contacts For Any Boiler Failure
❑ E.M.S. Stage Control Adapter
❑ Stack Rack
❑ Low Water Cut-Off
❑ Sequencing Control Panel with
Outdoor Reset (For 1-8 Boilers)
❑ Combustible Floor Shield
❑ Cupro-Nickel Heat Exchanger
❑ Extended Venting Kit
❑ CSA Certifi ed Vent Kit
GENESIS®VENTING VERSATILITY
DIRECT-VENTING
SIDEWALL VENTING CONVENTIONAL
VENTING
VENTING DISTANCES - EQUIVALENT FEET OF PIPE
MODEL
GB-300 60 ' 60' 110'
GB-400 thru GB-750 35' 35' 50'
*90 degree elbow is equivalent to 5 feet of straight pipe.
*45 degree elbow is equivalent to 3 feet of straight pipe.
For the most current Genesis venting distances/information, consult the Genesis Product Manual,
available through your local A.O. Smith representative, or online at www.aosmithwaterheaters.com.
DIRECT VENTING
INTAKE* EXHAUST*
SIDEWALL VENTING*
MODEL
NUMBER
GB/GBO-300 300,000 251,100 25 1.3 17 0.6 13 0.4
GB/GBO-400 399,900 334,716 34 2.2 23 0.9 17 0.6
GB/GBO-500 500,000 418,500 42 3.4 28 1.8 21 0.9
GB/GBO-650 650,000 554,050 55 3.5 37 2.0 27 1.8
GB/GBO-750 750,000 627,750 63 8.3 42 4.3 32 2.1
Gas Supply Pressure: 13.8 " in. 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.
NATURAL & PROPANE GAS
BTU INPUT
PER HOUR
BTU OUTPUT
PER HOUR
FLOW GPM PD-FT. HEAD FLOW GPM PD-FT. HEAD FLOW GPM PD-FT. HEAD
TEMPERATURE RISE AND PRESSURE DROP
40°F RISE 30°F RISE 20°F RISE
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