A.O. Smith GW-750, GWO-750 User Manual

Commercial Gas Boilers

MODELS

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 (

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

T) and tank temperature

GW/GWO-300

THROUGH

GW/GWO-750

Prevents short cycling when demand is low, delivers maximum output when
demand is high

LOW-NOX OPERATION

Meets 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

Revised October 2012

Revised November 2008

H

PG 1 OF 4

AOSDG25200

Commercial Gas Boilers

GW SERIES INDOOR MODELS GWO SERIES OUTDOOR MODELS

MODEL

NUMBER

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 66214221-1/16 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

Revised October 2012

Revised November 2008 PG 2 OF 4

BTU INPUT
PER HOUR

EXHAUST VENT AIR INLET WATER CONN. GAS PIPE

www.hotwater.com

DIMENSIONS IN INCHES

(SEE DRAWINGS ABOVE)

WIDTH A B C

AOSDG25200