A. O. Smith LB-1000 User Manual
Commercial Gas Boilers
®
®
90% EFFICIENT, LOW-NOx HYDRONIC HEATING BOILERS
The Legend 2000® series delivers an exceptional 90% thermal efficiency by combining
advanced pre-mix burner design and an extruded, self-baffling copper heat exchanger for
outstanding efficiency and unsurpassed performance. The heat-exchanger design exposes
more surface area to the combustion system to maximize heat transfer. Each model features
a small footprint with zero side clearance for outstanding adaptability perfect for retrofits.
The exclusive Dia-Scan® solid-state self-diagnostic system helps make operation and
troubleshooting quick and easy.
ADVANCED HIGH-EFFICIENCY, LOW-NOx COMBUSTION TECHNOLOGY
• Advanced burner design precisely pre-mixes gas and air before ignition,
increasing combustion efficiency and reducing emissions
• Delivers optimum burner performance for 90% thermal efficiency
• Meets or exceeds Texas and California SCAQMD Rule 1146.2 air quality
standards differential, loop temperature and fault codes
NEW STAINLESS STEEL BURNER DESIGN
• Features metal fiber alloy sheath for consistent heat distribution and
reliable performance under all conditions
DIA-SCAN BOILER CONTROL
• Comprehensive display panel includes LEDs with readouts for
current operating and fault status
• Precise temperature management of ± 1º F
• Self-diagnostics eliminate guess work and pinpoints problems—
trouble shooting has never been easier
EXCLUSIVE NO-BAFFLE HEAT EXCHANGER DESIGN
• Extruded copper manufacturing process exposes more surface area to
the combustion system for increased heat-transfer efficiency
• Unique self-baffling design (patent pending) is a significant improvement
over traditional heat-transfer systems
100% ALL NON-FERROUS WATERWAYS
• All waterways 100% copper, brass or bronze for years of reliable performance
• Impervious to thermal shock
GASKETLESS ASME HEAT EXCHANGER
• Superior design assures reliability and long-life performance
• Isolated location offers optimum protection and years of service
OPTIONAL FACTORY MOUNTED AND WIRED PUMP AVAILABLE
• Integral boiler mounted all bronze pump for primary/secondary pumping systems
• Allows for 50 equivalent feet of pipe between boiler and primary loop
COMPACT, LOW-PROFILE DESIGN
• Allows easy entry for modular installations
• Zero clearance on sides for maximum installation versatility
CATEGORY IV LISTED
• Legend 2000® boilers utilize a mechanical forced draft system designed to
prevent leakage of flue (vent) gases and condensate
MEETS OR EXCEEDS ASHRAE/IESNA 90.1-1999
TEN-YEAR HEAT EXCHANGER LIMITED WARRANTY
•
For complete information, consult written warranty or contact A. O. Smith
September 2006
LB-500
through
LB-1000
ASME
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ACMSS00805
®
®
90% EFFICIENT, LOW-NOx HYDRONIC HEATING BOILERS
CATEGORY IV LISTED
• Legend 2000® hot water supply boilers
utilize a mechanical forced draft system
designed to prevent leakage of flue (vent)
gases and condensate
PROFESSIONAL START-UP SERVICE
FURNISHED
• Assures optimum performance for each
installation
MEETS ASHRAE/IESNA 90.1-1999
• For complete information, consult written
warranty or contact A. O. Smith
OTHER LEGEND 2000
®
FEATURES:
ASME 160# W.P.
ASME PRESSURE RELIEF VALVE #50
FLOW SWITCH MOUNTED
BRASS DRAIN VALVE
LOW GAS PRESSURE SWITCH
LOW AIR PRESSURE SWITCH
DIGITAL THERMOMETERS
MANUAL RESET HI LIMIT
LEGEND 2000
®
OPTIONS:
❑ CODE OPTIONS: CSD-1
❑ I.R.I. CODE
❑ ILLINOIS CODE
❑ NEW YORK CODE
❑ CALIFORNIA CODE
❑ LOW WATER CUTOFF
❑ DRY CONTACTS FOR ANY
BOILER FAILURE
❑ ALARM BELL
❑ INTEGRAL BOILER MOUNTED PUMP
FOR PRIMARY/SECONDARY
PUMPING SYSTEMS
❑ SEQUENCING PANEL
❑ THROUGH-THE-WALL VENTING
❑ DIRECT/SEALED VENT KIT
❑ SKID-MOUNTED SYSTEMS
LEGEND 2000
®
VENTING VERSATILITY
STANDARD-VENT OR DIRECT-VENT FLEXIBILITY
• Standard-venting, vertical or horizontal sidewall
–Single pipe vent runs up to 180 equivalent feet
(90° elbow = 10 equivalent feet, 45° elbow or boot
tee = 5 equivalent feet)
• Two-pipe direct-venting vertical and/or horizontal
sidewall, with all combustion makeup air drawn from
outside the building
• Air intake and exhaust vent runs permitted up to
90 equivalent feet (90° elbow = 10 equivalent feet,
45° elbow or boot tee = 5 equivalent feet)
Please consult latest edition of the Installation Manual
for detail venting information and maximum/minimum
venting distances.
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ACMSS00805
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