n®f§iy
82% EFFICIENCY
Meets or exceeds the requirements of ASHRAE/IES 90.1 b-
1992.
FEATURES
ALL NON-FERROUS WATERWAYS - All castings are made
of Bronze or Brass. All water tubes are made from copper.
Brazed joints orflare union construction make the heater immune
to the effects of thermal shock and thermal cycling. The best
boiler for hot water supply.
EFFICIENT COPPER COIL COMBUSTION CHAMBER The combustion chamber is a heat exchanger formed from a
two passage coil of tightly wound continuous copper tube. Water
circulating through this coil captures radiant heat. A wrap of
insulation on the outside of the coil retains the heat captured by
the circulating water.
CONSERVATIONISr
COMMERCIAL BOILERS
HW-300 THRU HW-610
Domestic Hot Water Supply
Not approved for instantaneous applications.
COPPER HEAT EXCHANGER - Extended surface copper
tube having integral helical fins on the outside. The fins are
extruded directly from the tube. Burkay design provides a liberal
i heat transfer surface directly above the flame.
BURKAY BURNER MAXIMIZES EFFICIENCY - The patented
Burkay burner uses primary air injection at up to 72 individual
orifices plus secondary entrainment of air. Approved for
installation on combustible floors as shipped from factory.
GAS VALVES - Slow opening redundant gas valves ensure
smooth light-off without flame roll-out or pilot outage. (Dual stage
& modulation not available.)
THERMAL BALANCER - Patented pump delay system that
allows boiler and pump to run simultaneously but delays pump
shut off at end of heating cycle to remove usable heat from the
heater and reduce the scale forming tendencies of motionless
hot water.
AUTOMATIC SAFE CONTROLS AND ELECTRONIC
IGNITION - Natural gas units have a proven pilot ignition system
which provides flame failure response in under one (1) second.
Propane models have a standing pilot system. Redundant high
limit controls and gas valves assure safe shutoff in the event of
overheating or flame failure. Requires 120V 60Hz, maximum
inlet gas pressure of 14" W.C. and activation of heater by an
external temperature control.
OPTIONAL POWER VENT KIT - For sidewall venting.
WORKING PRESSURE - ASME approved, hydrostatically
tested and certified for 160 psi (1100 kPa).
* Model HW-399; 81% efficiency, Model HW-610: 80%
efficiency.
FOR UNITS BUILT
FOR U.S.A.
LIMITED WARRANTY OUTLINE
If the heat exchanger modules should fail
within 5 years, under the terms of the war
ranty; A.O. Smith will furnish a replacement
part; installation, labor, handling and local
delivery extra. THIS OUTLINE IS N01 A
WARRANTY. For complete information,
consult the written warranty or A.O, Smith
Water Products Company.
FOR UNITS BUILT
FOR CANADA
Revised December 1996
Д Л-И
NOTE:
TOP MANIFOLD HAS EXTRA OPENINGS FOR THERMOMETER 3/4“
ALL DIMENSIONS IN INCHES (MM)
Models
HW-300 65
HW-399 57-1/8
HW-420
HW-520
Propane
HW-610
Natural
HW-610
A В C
43-1/4
(1651)
(1099)36(914)
45-1/8
(1451)
57-1/8
(1451)
68-5/16
(1735)
67
(1702)
64-3/4
(1645)
Model
HW-300
HW-399 399,000
HW-420
HW-520
HW-610 610,000 LPH 11,194
Recovery capacity ratings are heater performance at an assigned 76% thermal efficiency. Actual recoveries are higher.
NOTE: To compensate for the effects of high altitude areas above 2.000 feet (610m), input and output rating should be
38-3/4
(1146)
(984)
45-1/8
38-3/4
(1146)
(984)
56-1/4
(1429)46(1168)
56-1/4
(1429)46(1168)
56-1/4
(1429)46(1168)
INPUT Temp. (C) 11 17
BTUH (KW)
300,000 LPH 5,505 3,670 2,753 2,202 1,835
(88) GPH 1,455 970
(116)
420,000 LPH
(123)
520,000 LPH
(152) GPH 2,521
(179) GPH 2,958 1,972
reduced approximately 4% for each 1,000 feet (305m) above sea level.
D E F
25-1/4
(641)
27
12
(305)8(203)
(686)12(305)10(254)
27
(686)12(305)10(254)
27
12
(686)
(305)10(254)18(457)
27
(686)
27
(686)12(305)12(305)
Rise (F) 20
LPH
GPH 1,935 1,290 967
GPH
12
12
(305)
(305)
SPECIFICATIONS AND RECOVERY CAPACITIES
30
7,322
4,882
7,708 5,138
2,036 1,358
9,543 6,362
1,681
7,463
(19MM) AND RELIEF VALVE 1“ (25MM) [HW-520 AND -610 ONLY]
G H
16-1/2
29-5/8
(419)
(753)
16-3/4
31-1/2
(425)
(800)9(229)14(356)
16-3/4
31-1/2
(425)
(800)
36-1/2
(927)
18
36-1/2
(457)
(927)
18
36-1/2
(927)9(229)11(279)2(51)2J51]_
(457)
TEMPERATURE RISE
22 26
40 50 60
727 582 485 416 354
3,661 2,929 2,441
3,854 3,083 2,569 2,202 1,927
1,018 815 679
4,771 3,817 3,181
1,261 1,008 840
5,597 4,478 3,731
1,479
J
К
9
(229)14(356)
9
(229)14(356)
9
11
(229)
(279)
9
(229)11(279)2(51)2(51)1(25)
39
33
70
1,573 1,376
774
1,183
2,092
553 484
645
582
2,727
720
3,198
986 845 739
L
1-1/4
(32)
1-1/2
(38)
1-1/2
(38)
2
(51)
M
1-1/4
(32)
1-1/2
(38)
1-1/2
(38)
2
(51)
44
80
1,831
509
2,386
630
2,799
N P Q
3/4
26-5/8
(19)
(676)1(25)
27-1/2
1
(25)
(699)
1
27-1/2
(25)
(699)1(25)
1
24-1/2
(25)
(622)
24-1/2
(622)
1
24-1/2
(25)
(622)
50 56 61
90 100 110
1,223
1,001 1,001
323
291
1,627
1,464
430
453
560
657
387
1,542
407
1,909
504
2,239
592
1,713
2,121
2,488
HW - 300 ONLY
HW-610
NATURAL GAS
R
10-1/8
(257)
11-1/4
1
(286)
(25)
11-1/4
(286)
3-1/2
12
(305)
(89)
3-1/2
(89)12(305)
12
3-1/2
(305)
(89)
67 72 78
120
918
264 242
1,331 1,220
1,735
2,035
352
1,401
370 339
458
538 493
322
1,285
1,590
420
1,866
ONLY
5-3/8
(137)5(127)
5-1/2
(140)
5-1/2
(140)5(127)
5-3/4
5-3/4
5-3/4
T
S
5
(127)
(146)7(178)
7
(178)
(146)
(146)7(178)
130 140
847 786
224 208
1,127 1,046
298 276
1,186 1,101
313 291
1,468 1,363
388 360
1,722 1,599
455 423
Approx.
Ship. Wt.
Lbs. (Kgs.)
240
(109)
291
(132)
291
(132)
361
(164)
361
(164)
361
(164)
SUGGESTED SPECIFICATIONS
Boiler{s) for hot water supply purposes shall be Model(s) No..
shall be gas-fired, and design certified by the Canadian Gas Association or an approveri/accredited independent rating laboratory, capable of
supplying
bearing the ASME code symbol. Boiler(s) shall be up flow type having all non-ferrous waterways, and employing a copper finned heat exchanger
and a tightly wound copper coil combustion chamber with 160 psi (1100 kPa) working pressure rating, Boiler(s) shall be equipped with an electric
gas valve of the step-opening type, an adjustable limit control which will break the electric circuit on temperature rise, intermittent ignition with one
(1) second shutdown in the event of pilot flame failure (propane models equipped with standing pilots), a gas pressure regulator properly set for the
gas to be supplied, and a coil limit switch for shut off in event of excessive water temperature, a thermal balancer, a certified draft diverter and a fully
illustrated instruction manual. Certified for combustible flooring. Outer jacket shall be of baked enamel finish. The coil, heat exchanger and burner
shall have a five year limited warranty as outlined in the written warranty.
A012.0C
______
GPH (LPH) at 100°F (56°C) temperature rise equipped to burn
> A. O. Smith Corp., 1996
. as manufactured by A. O. Smith or an approved equal. Boiler(s)
________________
A. 0. Smith Enterprises Ltd.
Water Products Company
A Subsidiary of A. O. Smith Corporation
Stratford, Ontario
A. O. Smith Corporation reserves the right to make product changes
or improvements at any time without notice.
gas, with input rating of
________
El Paso, Texas
McBee, South Carolina
Seattle, Washington
Veidhoven, The Netherlands
BTUH(KW)/hr. and
Printed in U.S.A.