A.O. Smith DB-720 thru 1810 User Manual
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Meets or exceeds ASHRAE/IES 90.1 b-1989 (1992 requirements) Standards.
FEATURES
ALL NON-FERROUS WATERWAYS - All heat exchanger waterways
are 100% copper and bronze. Heavy duty bronze castings and copper
heat exchanger tubes. Immune to thermal shock. Ideal for hydronic
applications.
OPTIMUM ENERGY HEAT TRANSFER - Double row integral finned
copper heat exchanger provides maximum heat transfer. A. O.
Smith’s self-baffling staggered tube design, assures up to 82%
thermal efficiency.
BRONZE REMOVABLE RETURN BENDS - Easily removable, these
allow access and Inspection of individual tubes. These bronze return
bends offer the optimum protection against corrosion or rust found
in cast iron headers.
GASKETLESS WET SECTION - Unique “o” ring design compresses
and forms a water tight seal outside and away from the combustion
chamber. This isolation allows for years of trouble-free service
without gasket leaks.
DURAMAX STAINLESS STEEL BURNERS - Reliable, safe and
quiet. Protects against corrosion and deterioration found with
aluminized burners. Easy slide out burner tray.
LOW-PROFILE DESIGN - Draft diverter is built-in to provide extra
clearances for those tight retrofit applications. Certified by A.G.A./
C.G.A.
AUTOMATIC SAFE CONTROLS - Highest quality controls assure
dependable operation, require practically no attention. Safety shutoff
of pilot and main burners in the event of pilot failure.
INTERMITTENT IGNITION - Standard on all Dura-Max.
COMPACT DESIGN - This rugged unit incorporates a clean, compact
jacket design. Allows for easy access and disassembly. Cool to the
touch. Approved for combustible floor installations. Gas train is
enclosed inside the cabinet.
OTHER FEATURES
• Manual reset high limit • ASME rated pressure relief valve 50#
(345 kPa) • Factory installed safety flow switch • Redundant safety
gas valve • On/Off switch with indicator light.
OPTIONS
• Thermal Balancer Pump Delay • Panel mounted Inlet/outlet dial
thermometers and pressure gauge • Modulation or dual stage firing
• Right end gas and/or water connections • Cupro-Nickel Heat
Exchanger • Side Wall Vent Kits.
CERTIFICATION - A.G.A., C.G.A., FM, ASME 160 psi (1100 kPa).
If the heat exchanger should fail within 10 years,
under the terms of the warranty, A. O. Smith will
furnish a replacement part; installation, labor,
handling and local delivery extra. THIS OUTLINE
IS NOT A WARRANTY. For complete information,
consult the written warranty or A. O. Smith Water
Products Company.
Warranty does not apply to product installed outside
of the United States of America or its territorial
possessions and Canada.
Minimum Clearances To Combustibles In Inches (MM)
Water
Top
Side
All Models 12" (305) 12" (305)
Blank
Side
Rear
6" (152) 6" (152)
Vent Front
6" (152)
Alcove
Additional clearances for service is recommended.
ALL DIMENSIONS IN INCHES (MM)
Model A В
Width Depth
DB-720 46 1/2 29 5/8
DB-840
DB-960 57 3/4 29 5/8
DB-1080
DB-1210 581/2 32 3/4
DB-1350 641/2 32 3/4
DB-1480
DB-1610
DB-1810 82 1/2
(1184) (752)
52 3/16 29 5/8 54 3/4
(1326) (752)
(1467) (752)
52 7/8 32 3/4 58 1 1/4 7 1/2 181/2
(1343) (832) (1473)
(1486) (832)
(1638) (832)
691/2
(1765) (864) (1537)
(1905)
(2095) (864)
34
75 34
(864) (1537)
34
Cabinet
Gas
Height inlet Inlet Outlet
Water Height To Depth To Water
Water
Gas Inlet Gas Inlet inlet/Outlet Relief
C D E F
54 3/4 1 1/4 7 3/4 15 1/2 171/4
(1391) (32) (197) (394)
1 1/4
(1391) (32) (197) (394)
54 3/4 1 1/4 7 3/4 15 1/2
(1391) (32)
(32)
58 1 1/2 7 1/2 18 1/2
(1473) (38)
58 1 1/2
(1473) (38)
1 1/2
60 1/2
60 1/2 2
60 1/2 2
(1537)
(38)
(51)
(51)
15 1/2 17 1/4
7 3/4
(197) (394)
(191) (470)
(470) (472)
(191)
18 1/2 18 9/16
7 1/2
(191) (470)
71/2 18 1/2 19 1/8
(191) (470) (486)
7 1/2 181/2
(191) (470) (486)
7 1/2 18 1/2 19 1/8
(191) (470) (486)
(438) (108) (51)
(438)
171/4
(438)
18 9/16 4 21/2 1 1/4
(472)
18 9/16 4 2 1/2 1 1/4
(472)
191/8
Pressure
G H J L
41/4 2 1
4 1/4 2 1
(108)
41/4
(108) (51) (25)
(102)
(102)
4 2 1/2 1 1/4
(102)
4 1/2 2 1/2 1 1/4
(114) (64) (32)
4 1/2
(114) (64) (32)
4 1/2 2 1/2 1 1/4
(114)
(51) (25)
2 1
(64)
(64)
(64) (32)
21/2 1 1/4
(64)
(25) (305)
(32)
(32)
(32)
Flue
Depth To
Size Flue Center
M N P
12 151/2 321/2
14
(356) (419) (826)
(356)
16
(406)
16
(406)
18
(457) (438) (786)
18
(457)
(457) (349) (787)
(508)
(394)
161/2
14 16 1/2
(419)
17 1/4
(438)
171/4
(438)
171/4
13 3/4
(349)
18 13 3/4 31
20
13 3/4
(349) (787)
Height To Leg Approx.
Inlet/Outlet Width
3015/16
3015/16
30 15/16
Gas supply pressure 13.8" w.c. maximum, 5.5" w.c. minimum. Natural gas only. Electrical requirements -120 VAC; 15 Amps.
Ship.
Weight
Q
341/2 780
(826)
321/2
321/2 42 3/4 950
(826)
(786)
(786)
31
(787)
31
(876)
40 3/16
(1021) (431)
(1086)
40 7/8
(1038)
46 1/2 1,025
(1181)
521/2
(1333)
571/2
(1461)
(1600)
70 1/2
(1791) (567)
(354)
950
(431)
1,000
(454)
(465)
1,100
(499)
1,125
(510)
63
1,150
(522)
1,250
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