A.O. Smith GW/GWO-750 Boiler User Manual


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Revised November 2008
AOSDG25200
Commercial Gas Boilers
84% EFFICIENT, LOW-NOx HOT WATER SUPPLY BOILERS
FEATURES
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 (GW Series) or outdoors (GWO Series).
NEW EMC-5000 ENERGY MANAGEMENT CONTROL
Patent pending
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 (
T) and tank temperature
Help screens assist in boiler setup and explain control options
Included remote temperature sensor when mounted in the storage tank
allows the tank temperature to be set and monitored at the boiler
TWO-STAGE GAS FIRING SYSTEM
Twin gas valve firing system prevents short cycling and ensures
smooth operation, saves fuel and extends boiler life
Prevents short cycling when demand is low, delivers maximum output when
demand is high
LOW-NOX OPERATION
Meets or exceeds Texas and California SCAQMD Rule 1146.2 air quality standards
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
Optional stack rack allows one unit to be stacked on top of another, doubling output within
the footprint of a single unit
MEETS ASHRAE/IESNA 90.1-2004
FIVE-YEAR HEAT EXCHANGER LIMITED WARRANTY
For complete information, consult written warranty or contact A. O. Smith
MODELs
gw/gwO-300
thrOugh
gw/gwO-750
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