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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
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®
®
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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DIMENSIONS AND SHIPPING WEIGHTS
MODEL
NUMBER
INCHES
OR
CM
A B C D E F G H J K L M N P Q R
Commercial Gas Boilers
DIMENSIONS
SHIPPING
WEIGHT
LW-500
CM 134.6 58.4 81.3 34.3 11.1 8.3 16.2 19 8.9 48.3 36.8 12.7 13.3 29.2 5.1 2.5 193.2 Kg
LW-750
CM 134.6 58.4 81.3 34.3 11.1 8.3 16.2 19 8.9 48.3 28.6 12.7 13.3 29.2 5.1 2.5 240 Kg
CM 153.7 68.9 97 34.9 39.4 8.3 20.6 21 8.9 91.4 30.5 17.1 10.5 34 5.7 3.2 424.5 Kg
Inches 53 23 32 13-1/2 4-3/8 3-1/4 6-3/8 7-1/2 3-1/2 19 11-1/4 5 5-1/4 11-1/2 2 1 528 Lbs.
LW-1000
Inches 60-1/2 27-1/8 38-3/16 13-3/4 15-1/2 3-1/4 8-1/8 8-1/4 3-1/2 36 12 6-3/4 4-1/8 13-3/8 2-1/4 1-1/4 934 Lbs.
Vent Size on LW-500 and LW-750: 6"/15.2 CM
Vent Size on LW-1000: 7"/17.8 CM
BOILER INPUT, OUTPUT AND PRESSURE DROP
FLOW RATE @ 20°F/
Inches 53 23 32 13-1/2 4-3/8 3-1/4 6-3/8 7-1/2 3-1/2 19 14-1/2 5 5-1/4 11-1/2 2 1 425 Lbs.
LW-1000
LP 860,000 774,000
TYPE
MODEL
NUMBER
OF
GAS
Natural 500,000 450,000
LW-500
LW-750
LP 450,000 405,000
Natural 750,000 675,000
LP 675,000 607,500
BTUH BTUH
INPUT OUTPUT
Natural 1,000,000 900,000
11°C TEMPERATURE RISE
GPM
PD-FT/
HD
LPM
PD-M/
45 10 170.3 3.0
68 10.1 257.4 3.1
91 8.9 344.4 2.7
HD
R
B
A
C
E
D
K
(NPT GAS INLET)
F
4"
(10.16 CM)
BLOWER
INLET
4" x 4"
(10.16 x 10.16 CM)
JUNCTION BOX
CONNECTION
2" (5.08 CM)
WATER
INLET
Q
P
CONDENSATE
DRAIN TUBE
(3/8" I.D., 5/8" O.D.)
(.9525 CM I.D., 1.5875 CM O.D.)
F
N
2" (5.08 CM)
WATER
OUTLET
G
6" (15.24 CM)
VENT
EXHAUST
LK
M
D
E
H
6" BLOWER
INLET
4" x 4"
(10.16 x 10.16 CM)
JUNCTION BOX
CONNECTION
J
F
2" (5.08 CM)
R (NPT
GAS INLET)
WATER
INLET
Q
P
CONDENSATE
DRAIN TUBE
(3/8" I.D., 5/8" O.D.)
(.9525 CM I.D., 1.5875 CM O.D.)
N
G
N
2" (5.08 CM)
WATER
OUTLET
7" (17.78 CM)
VENT
EXHAUST
L
M
Models LW-500, 750 Model LW-1000
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ACMSS00705
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COMMERCIAL
®
®
90% EFFICIENT, LOW-NOx HOT WATER SUPPLY BOILER
SUGGESTED SPECIFICATION
The gas-fired hot water supply boiler(s) shall be A. O. Smith Legend 2000® model LW ______ having an input
rating of _______ BTU/hr and capable of supplying no less than ______ GPH at a 100°F temperature rise when
fired with Natural/Propane gas. The boiler shall: 1) Bear the ASME "H" stamp and shall be National Board
registered for 160 PSI working pressure. 2) Be test certified at 90% thermal efficiency by CSA International.
3) Meet SCAQMD Rule 1146.2 for low-NOx emissions and air quality standards.
The heat exchanger shall: 1) Incorporate 5/8" I.D. finned copper tubing with 9 fins per inch and an integrated
self-baffling tube design. No “V” baffles are acceptable. 2) Be circular, encompassing the entire burner and
forming the combustion chamber. No gaskets are acceptable in the combustion chamber, burner assembly,
or the ASME wet section. Combustion chamber tube shall be glass-coated steel to prevent damage by
condensation.
The hot water supply boiler(s) shall be supplied with a factory supplied, sized and wired boiler-circulating pump.
™
The gas burner shall be constructed of Inconel
360-degree flame pattern. Fuel and gas mixture shall take place in the stainless steel pre-mix tube for safety.
Pressurized cabinets are unacceptable. Gas orifices shall be replaceable without removal of the burner.
Boiler shall have an inner steel frame, and jacket panels shall have a baked-on enamel finish. The unit must
be capable of operating with jacket panels removed for inspection and maintenance. Control panel shall permit
easy access and have a protective cover, removable with no tools. All units shall utilize an approved AL29-4C
stainless steel vent system to handle condensation. The Dia-Scan
control 15 operating and safety functions. Indicating lights will monitor and include air, transformer, ignition, gas
pressure, water flow, gas valves, pre-purge, post-purge and safety lockouts.
CSA International certified for installation on combustible floor. Standard operating controls and equipment
shall include: hot surface electronic ignition, operating aquastat, manual reset hi-limit, automatic main and
redundant gas valve, master switch with pilot light, digital inlet/outlet temperature gauges, ASME safety
relief valve, flow switch, heat-resistant glass viewing port, and Dia-Scan
The boiler shall be equipped for 120V, single-phase, 60 Hz current. Complete operating and start-up
instructions are to be furnished with unit. Units shall meet or exceed ASHRAE/IESNA 90.1-1999.
Controls shall be 24 VAC, including slow-opening main gas valve for soft ignition, redundant safety shutoff
gas valve, main and pilot pressure regulators, recycling intermittent pilot system with one-second shutdown
in the event of pilot flame failure, automatic recycling high limit, manual reset ECO limit, main and pilot manual
cocks and manual firing valve, and an ASME-rated pressure relief valve. The boiler shall be approved by
Factory Mutual (FM).
The boiler shall comply with ASHRAE/IESNA 90.1-1999 standards. The boiler manufacturer must supply
complete factory start-up by a factory approved start-up agent.
625 stainless steel, warranted for 5 years, and fire in a radial
®
solid-state control system shall monitor and
®
control system.
w w w. hotwater. c o m
For Technical Information and Automated Fax Service, call 800-527-1953.
A. O. Smith reserves the right to make product changes or improvements without prior notice.
500 Tennessee Waltz Parkway, Ashland City, TN 37015
©2006 A. O. Smith Corporation Printed in U.S.A AOSC-108133-10M
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ACMSS00705
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