A. O. Smith LW-1000 User Manual
Commercial Gas Boilers
®
®
90% EFFICIENT, LOW-NOx HOT WATER SUPPLY BOILER
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 that is perfect for
retrofits. The exclusive Dia-Scan® solid-state self-diagnostic system helps make operation
and troubleshooting quick and easy.
ADVANCED COMBUSTION TECHNOLOGY
• Advanced burner design precisely pre-mixes gas and air increasing
combustion efficiency and reducing emissions
• Delivers optimum burner performance for 90% thermal efficiency
LOW-NOx OPERATION
• Meets or exceeds Texas and California SCAQMD Rule 1146.2 air
quality standards
LW-500
through
LW-1000
NEW STAINLESS STEEL BURNER
• Features metal fiber alloy sheath for consistent heat distribution and reliable
performance under all conditions
ALL-BRONZE FACTORY MOUNTED PUMP
• Integrally mounted and wired
• Factory sized for proper flow between boiler and storage tank
• Allows 50 equivalent feet of piping between boiler and tank
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
STANDARD-VENT OR DIRECT-VENT FLEXIBILITY
• Standard-vent configuration, vertical or horizontal sidewall
• Two-pipe direct-venting vertical and/or horizontal sidewall, with all combustion
makeup air drawn from outside the building
COMPACT, LOW-PROFILE DESIGN
• Zero clearance on sides, ideal for multiple boiler installations
• Fits through 30" doors and into elevators for hard-to-get retrofit applications
ASME
January 2006
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ACMSS00705
®
®
90% EFFICIENT, LOW-NOx HOT WATER SUPPLY BOILER
CATEGORY IV LISTED
• A condensing gas appliance that
operates with a positive vent pressure
PROFESSIONAL START-UP SERVICE
FURNISHED
• Assures optimum performance for each
installation
MEETS ASHRAE/IESNA 90.1-1999
• Five-year heat exchange warranty
®
OTHER LEGEND 2000
FEATURES:
• ASME 160# W.P.
• ASME PRESSURE RELIEF VALVE 125#
• FACTORY MOUNT FLOW SWITCH
• BRASS DRAIN VALVE
• LOW GAS PRESSURE SWITCH
• INLET/OUTLET
DIGITAL THERMOMETERS
• MANUAL RESET HI-LIMIT
®
LEGEND 2000
FM APPROVED OPTIONS:
❑ CSD-1 CODE
❑ I.R.I. CODE
❑ SEQUENCING PANEL
❑ ALARM BELL
❑ SIDEWALL VENT KITS
❑ VERTICAL AND HORIZONTAL
DIRECT VENT KITS
❑ SKID-MOUNTED SYSTEMS
❑ DRY CONTACTS FOR ANY
BOILER FAILURE
❑ LOW WATER CUTOFF
❑ LP GAS
VERSATILE MULTI-VENTING CONFIGURATIONS
DIRECT-VENTING
90 Equivalent Feet Exhaust
90 Equivalent Feet Intake
90 Degree Elbows = 10 Feet
45 Degree Elbows = 5 Feet
Boot Tee = 5 Feet
SIDEWALL VENTING CONVENTIONAL
SIDEWALL VENTING CONVENTIONAL
VENTING
VENTING
180 Equivalent Feet Max
90 Degree Elbows = 10 Feet
45 Degree Elbows = 5 Feet
Boot Tee = 5 Feet
INPUT AND RECOVERY
BTU
MODEL INPUT
NUMBER PER
40°F 100°F 140°F
HOUR
22°C 56°C 78°C
Natural LPH 5162 2065 1475
450,000 GPH 1227 491 351
Propane LPH 4646 1858 1327
Natural LPH 7743 3097 2212
LW-750
675,000 GPH 1841 736 526
Propane LPH 6968 2787 1991
Natural LPH 10,324 4129 2950
LW-1000
860,000 GPH 2345 938 670
Propane LPH 8878 3551 2537
Maximum gas supply pressure (natural and propane gas): 13.8" w.c.
Minimum gas supply pressure, natural gas: 7" w.c.
Minimum gas supply pressure, propane gas: 11" w.c.
The LEGEND 2000
independent line source that is: 120 Volts, 60 Hertz, 30 Amps.
NOTE: For proper boiler performance, it is important that the
LEGEND 2000
Do not put other applications on the same breaker as the boiler.
500,000 GPH 1364 545 390
LW-500
750,000 GPH 2045 818 584
1,000,000 GPH 2727 1091 779
®
must be connected to a single-phase
®
is on its own separate breaker.
RECOVERY – GALLONS OR
GPH
OR
LPH
LITRES PER HOUR AT
DEGREE RISE
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ACMSS00705
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