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®
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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AOSHG30100
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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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AOSHG30100
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®
Hydronic Heating Boilers
ALTERNATE
INLET AIR
24 "
RELIEF
VALVE
30 "
20 -1/2 "
GB SERIES INDOOR MODELS
INLET AIR
3-11/16 "
6-5/16 "
13-7/8 "
EXHAUST VENT
ALTERNATE
EXHAUST VENT
GAS CONNECTION
(GB 650 & 750 ONLY)
24 "
GAS CONNECTION
(GB 300 THRU 500)
24-5/8 "
20-1/4 "
3-1/2 "
A "
B "
GBO SERIES OUTDOOR MODELS
GAS CONNECTION
(GBO 300 THRU 500
GAS CONNECTION
(GBO 650 & 750)
6 "
OPTIONAL SECONDARY PUMP
IGNITION
CONTROL
BOARD
FLOW SWITCH
13-13/16
"
MODEL
UIM FRONT PANEL
C
INPUT
NUMBER
GB SERIES INDOOR MODELS
GB-300 300,000 5 5 1-1/2 3/4 29-1/2 14-13/16 9 12
GB-400 400,000 6 6 1-1/2 1 35-3/4 17-15/16 9 14-3/4
GB-500 500,000 6 6 2 1 42 21-1/16 9 14-3/4
GB-650 650,000 8 8 2 1-1/4 51-3/8 25-3/4 9 14-3/4
GB-750 750,000 8 8 2 1-1/4 57-3/8 28-7/8 9 17-1/4
GBO SERIES OUTDOOR MODELS
GBO-300 300,000 - - 1-1/2 3/4 - 49 24-3/16 GBO-400 400,000 - - 1-1/2 1 - 55-1/4 24-3/16 GBO-500 500,000 - - 2 1 - 61-1/2 24-3/16 GBO-650 650,000 - - 2 1-1/4 - 70-7/8 - 27-11/16
GBO-750 750,000 - - 2 1-1/4 - 77-1/8 - 27-11/16
BTU
PER
HOUR
WIDTH
EXHAUST
VENT
AIR INLET
WATER
CONN.
DIMENSIONS IN INCHES
GAS PIPE
WIDTH A B C
74”
(See Drawings Above)
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AOSHG30100
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®
Hydronic Heating Boilers
84% EFFICIENT, LOW-NOX HYDRONIC
HEATING BOILERS
The hydronic heating boiler(s) shall be an A. O. Smith Genesis ® Model ___________________ having an input rating of__________________
GENESIS® HYDRONIC HEATING BOILER SUGGESTED SPECIFICATION
BTU/hr. and an output rating of _________________ BTU/hr. on natural or propane gas. The boiler shall bear the ASME “H” stamp and
shall be National Board registered for 160 PSI working pressure. The boiler shall be test certified at 84% thermal efficiency by CSA of
ANSI Z21.13-CSA 4.9 Harmonized Standard Latest Addenda. The boiler’s copper fin tube heat exchanger shall be a horizontal, single row,
two pass design. The solid copper tubes shall have integral extruded copper fins spaced at “7” fins per inch, and be rolled into heavy
steel tube sheets. High temperature silicone “O” rings shall provide a watertight seal between each tube and the ASME code Bronze/Cast
Iron headers. Headers must be field removable to allow complete inspection of all waterways. Non-removable headers, with tubes rolled
directly into the headers, shall not be acceptable. The low mass, low water volume heat exchanger shall be explosion-proof and immune
to thermal shock.
The combustion chamber shall be fully lined with high temperature ceramic fiber insulation, rated to 2,300°F. The jacket panels shall
be coated with a baked-on powder-coat finish, suitable for outdoor service. The jacket shall be of tight construction, and weather- and
water-resistant.
The boiler shall employ a fan induced premixed multi-burner system firing into a pressurized combustion chamber. Atmospheric or power
burners will not be acceptable. Only stainless steel/titanium alloy burners will be acceptable.
All boiler functions shall be controlled, operated, and monitored by a microprocessor-based control. The microprocessor shall control the
boiler temperature and be accurate to within plus or minus 1°F. The hot surface ignition system shall employ a separate flame sensor for
maximum reliability.
Provisions for connecting a remote thermistor, alarm bell, pump, and alternate temperature controller must be provided.
Factory mounted and wired flow, blower prover, and blocked flue switches shall be provided. The gas train shall meet or exceed the
requirements of ANSI Z21.13-CSA 4.9 and include gas pressure regulator, manual gas cock, redundant safety gas valve, operating control
valve, and plugged pressure test tapings. The ASME rated pressure relief valve shall be factory-installed.
The boiler shall be certified for direct horizontal through-the-wall venting, or direct vertical venting; in addition to sidewall or
conventional vertical venting. The boiler must be field convertible from top mounted venting to rear mounted venting. The boiler
shall be capable of horizontal sidewall or direct venting up to 35 equivalent feet without the aid of any optional sidewalll vent fans or
blowers.
Water heater should incorporate the iCOMM™ system for remote monitoring, leak detection and fault alert.
For Technical Information and Automated Fax Service, call 800-527-1953. A. O. Smith Corporation reserves the right to make product changes or improvements without prior notice.
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AOSHG30100
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