A.O. Smith BTH-120 through BTH-500 Water Heater User Manual


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UP TO 96% THERMAL EFFICIENCY,DIRECT VENT
SUGGESTED SPECIFICATION
(Natural or Propane) gas water heater(s) shall be A. O. Smith Cyclone Xi model # _________ or equal, with up to 96% thermal efficiency, a storage capacity of
______ gallons, an input rating of __________ BTUs per hour, a recovery rating of ___________ gallons per hour (gph) at 100° F rise and a maximum hydrostatic
working pressure of 160 PSI. Water heater(s) shall: 1. Have seamless glass-lined steel tank construction, with glass lining applied to all water-side surfaces
after the tank has been assembled and welded; 2. Have a spiral-shaped heat exchanger placed entirely inside the tank, which shall be glass-lined to protect
against acidic flue gas condensate; 3. Have foam insulation and an ASME-rated temperature and pressure relief valve; 4. Have a down-fired power burner
designed for precise mixing of air and gas for optimum efficiency, requiring no special calibration on start-up; 5. Be approved for 0˝ clearance to combustibles.
Heater shall be supplied with maintenance-free powered anode.
The control shall be an integrated solid-state temperature and ignition control device with integral diagnostics, graphic user interface, fault history display, and
shall have digital temperature readout.
The water heater(s) shall: 1. Be design-certified by UL (Underwriters Laboratories), according to ANSZ21.10 standards governing storage-type water heaters; 2. Meet
ASHRAE/IESNA 90.1-1999; 3. Be design-certified by Underwriters Laboratories for 180°F (62° C) water; 4. Meet SCAQMD Rule 1146.2 for low-NOx emissions.
For conventional-vent specification: The BTH-120 - 250 water heater(s) shall be suitable for venting in 3˝ PVC pipe for a total equivalent distance of 50 ft
and 4˝ PVC pipe for a total equivalent distance of 120 ft.
The BTH-300 - 500 water heater(s) shall be suitable for venting only in 4˝ PVC pipe, for a total equivalent distance of 70 ft.
For sealed-combustion direct-vent specification: The BTH-120 - 250 water heater(s) shall be suitable for venting with (3˝ or 4˝) _______ diameter PVC pipe for a
total equivalent distance of (50 ft or 120 ft) ________ feet. [Alternative venting: the heater(s) shall be suitable for sealed combustion direct venting using a (3˝ or 4˝)
________ diameter PVC exhaust pipe for a total distance of (50 ft or 120 ft) ________ equivalent feet of vent and (50 ft or 120 ft) _______ equivalent feet of intake.]
The BTH-300 - 500 water heater(s) shall be suitable for sealed combustion direct-vent using only 4˝ diameter PVC pipe and 4˝ diameter PVC exhaust pipe for a
total equivalent distance of 70 ft.
Operation of the water heater(s) in a closed system where thermal expansion has not been compensated for (with a properly sized thermal expansion tank) will
void the warranty.
ACGSS02407
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U.S. Gallons/Hr and Litres/Hr at TEMPERATURE RISE INDICATED
MODEL
TYPE OF
GAS
INPUT
Thermal
Efficiency
Approx.
Capacity
Fº 30 Fº 40 Fº 50 Fº 60 Fº 70 Fº 80 Fº 90 Fº 100 Fº 110 Fº 120 Fº 130 Fº 140 Fº
BTUH KW Cº 17 Cº 22 Cº 28 Cº 33 Cº 39 Cº 44 Cº 50 Cº 56 Cº 61 Cº 67 Cº 72 Cº 78 Cº
BTH 120
NATURAL/
PROPANE
120,000
95%
60 U.S. Gal GPH 461 345 276 230 197 173 154 138 126 115 106 99
35 227 Litres LPH 1744 1308 1046 872 747 654 581 523 476 436 402 374
BTH 150
NATURAL/
PROPANE
150,000
95%
100 U.S. Gals. GPH 576 432 345 288 247 216 192 173 157 144 133 123
44 379 Litres LPH 2179 1635 1308 1090 934 817 726 654 594 545 503 467
BTH 199
NATURAL/
PROPANE
199,900
95%
100 U.S. Gals. GPH 767 575 460 384 329 288 256 230 209 192 177 164
58 379 Litres LPH 2904 2178 1743 1452 1245 1089 968 871 792 726 670 622
BTH 250
NATURAL/
PROPANE
250,000
95%
100 U.S. Gals. GPH 960 720 576 480 411 360 320 288 262 240 221 206
73 379 Litres LPH 3632 2724 2179 1816 1557 1362 1211 1044 991 908 838 778
BTH 300
NATURAL/
PROPANE
300,000
96%
130 U.S. Gals. GPH 1164 873 699 582 499 436 388 349 318 291 269 250
88 492 Litres LPH 4406 3304 2644 2203 1888 1652 1469 1322 1201 1102 1017 945
BTH 400
NATURAL/
PROPANE
399,900
96%
130 U.S. Gals. GPH 1552 1164 931 776 665 582 517 465 423 388 359 332
117 492 Litres LPH 5875 4406 3525 2938 2518 2203 1958 1759 1602 1469 1356 1259
BTH 500
NATURAL/
PROPANE
499,900
95%
130 U.S. Gals. GPH 1919 1439 1151 959 822 720 640 576 523 480 443 411
146 492 Litres LPH 7263 5447 4358 3631 3113 2724 2421 2179 1981 1816 1676 1556
Recovery capacities are based on heater performance at 95% and 96% thermal efficiency.
Add "A" to model number when ordering ASME. Optional on 120 - 250 models. Standard on 300 - 500 models.
Maximum gas supply pressure for 120 - 250: 10.5" w.c. natural gas 14" w.c propane. Maximum gas supply pressure for 300-500 10" w.c. natural gas 13" w.c. propane.
Manifold pressure: 4" w.c. natural gas 10" w.c. propane. Electrical requirements: 120 VAC, Blower 2.2 Amps FL, Igniter 4.0 Amps.
RECOVERY CAPACITY
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.
.A.S.UnidetnirP
July 2007R
December 2007R
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