AO Smith Water Heater ACGSS02407 User Manual

BTH-120  
through  
BTH-500  
UP TO 96% THERMAL EFFICIENCY,DIRECT VENT  
The A.O. Smith Cyclone Xi family of products represents the industry’s most technologically  
advanced commercial water heaters. The innovative Cyclone Xi design takes performance to  
its highest level with efficiencies of 95% and 96%. Models are available from 120,000 BTUs  
and now up to 500,000 BTUs. In addition, the Cyclone Xi features an Intelligent Control  
System making it the smartest water heater in the industry.  
Cyclone Xi provides outstanding hot water output, with dramatic savings on operating costs  
compared to units with standard 80% efficiency. A.O. Smith’s leading-edge engineering  
delivers conventional power-vent or sealed combustion power direct-vent versatility, low NOx  
emissions and excellent space-saving characteristics. Powered anodes, standard on all  
Cyclone Xi models, provide superior tank protection for years of trouble free operation.  
INTELLIGENT CONTROL SYSTEM WITH LCD DISPLAY  
• Exclusive A.O. Smith designed control  
• Provides detailed water heater status information  
• Precise temperature control  
• Built-in diagnostics  
• Run histrory information  
SUBMERGED COMBUSTION CHAMBER,  
WITH HELICAL HEAT EXCHANGER COIL  
• Positioned in center of tank, surrounded by water to virtually  
eliminate radiant heat loss from chamber  
• Spiral heat exchanger keeps hot burner gases swirling, uses centrifugal  
force to maximize efficiency of heat transfer to water in tank  
• Spiral heat exchanger prevents scale and sediment from forming on  
water-side surface, which can reduce energy efficiency over time  
POWERED ANODES STANDARD ON ALL MODELS  
• Provides long-lasting tank protection in varying water conditions  
• Does not require maintenance or inspection  
Approved,  
Rule 1146.2 Low NOx for  
California and Texas  
®
PERMAGLAS ULTRA COAT GLASS LINING  
• Exclusive process provides superior protection against corrosion  
BTH-120-250  
• Both sides of heat exchanger coil are lined for protection against flue gas  
condensate inside coil  
MECHANICAL VENTING VERSATILITY  
• Conventional power-venting or sealed combustion direct venting  
• Vents vertically or through sidewall  
• Direct-vent intake and exhaust pipe can terminate separately outside building,  
or through single opening, using concentric vent assembly  
BTH-300-500  
• Uses inexpensive PVC, CPVC or ABS pipe for intake and exhaust  
HIGH EFFICIENCY PRE-MIX POWERED BURNER  
• Down-fired pre-mix burner provides optimum efficiency and quiet operation  
Top-mounted burner position prevents condensation from affecting burner operation  
Page 1 of 4  
ACGSS02407  
December 2007R  
 
BTH-120-250  
WATER OUTLET  
1 1/2˝ NPT  
A
B
D
G
C
BTH-300-500  
E
F
INSTALLATION CLEARANCES  
MAXIMUM EQUIVALENT  
VENT LENGTH:  
GAS VALVE PIPING  
Sides  
0˝  
0˝  
BTH-120  
BTH-150  
BTH-199  
BTH-250  
BTH-300  
BTH-400  
BTH-500  
1/2˝ NPT  
3/4˝ NPT  
BTH-  
120 – 250  
using 3˝ pipe:  
Front  
50 ft.  
Rear  
0˝  
3/4˝ NPT  
3/4˝ NPT  
1 1/4˝ NPT  
1 1/4˝ NPT  
1 1/2˝ NPT  
BTH-  
120 – 250  
using 4˝ pipe:  
120 ft.  
Top  
1.5˝  
To Combustibles*  
• Approved for combustible floors  
0˝  
BTH-  
using 3˝ pipe:  
300 – 500 not applicable  
BTH-  
300 – 500  
using 4˝ pipe:  
70 ft.  
DIMENSIONS AND SHIPPING WEIGHTS  
DIMENSIONS  
SHIP WEIGHT  
SHIP WEIGHT  
STD  
ASME  
MODEL  
A
B
C
D
E
F
G
INCHES/CM INCHES/CM INCHES/CM INCHES/CM INCHES/CM INCHES/CM INCHES/CM  
LBS/KG  
LBS/KG  
55.5/141  
44.5/113  
35/88.9 27.75/70.5 7.5/19.1  
6.3/16  
6.3/16  
6.3/16  
47/119.4  
68/172.7  
72/182.9  
460Lbs/208.7Kg 490Lbs/222.2Kg  
555Lbs/251.7Kg 595Lbs/269.9Kg  
555Lbs/251.7Kg 595Lbs/269.9Kg  
BTH-120  
BTH-150  
75.5/191.8 64.5/163.8 55.5/141 27.75/70.5 7.5/19.1  
75.5/191.8 64.5/163.8 55.5/141 27.75/70.5 7.5/19.1  
BTH-199, 250  
75.5/191.8 64.5/163.8 50.77/129 33.12/84.1  
8/20.3  
4.86/12.3 67.25/170.8  
N/A  
855Lbs/408.2 Kg  
BTH-300, 400, 500  
Water connections: 1-1/2˝  
Page 3 of 4  
ACGSS02407  
 
UP TO 96% THERMAL EFFICIENCY,DIRECT VENT  
RECOVERY CAPACITY  
U.S. Gallons/Hr and Litres/Hr at TEMPERATURE RISE INDICATED  
INPUT  
BTUH  
Fº  
Cº  
30 Fº 40 Fº 50 Fº 60 Fº 70 Fº 80 Fº 90 Fº 100 Fº 110 Fº 120 Fº 130 Fº 140 Fº  
17 Cº 22 Cº 28 Cº 33 Cº 39 Cº 44 Cº 50 Cº 56 Cº 61 Cº 67 Cº 72 Cº 78 Cº  
TYPE OF  
MODEL  
Thermal  
Approx.  
Capacity  
GAS  
Efficiency  
KW  
35  
120,000  
150,000  
199,900  
250,000  
300,000  
399,900  
499,900  
60 U.S. Gal GPH 461  
227 Litres LPH 1744 1308 1046 872  
100 U.S. Gals. GPH 576 432 345 288  
379 Litres  
100 U.S. Gals. GPH 767  
379 Litres  
100 U.S. Gals. GPH 960  
379 Litres  
130 U.S. Gals. GPH 1164 873  
492 Litres  
130 U.S. Gals. GPH 1552 1164 931  
492 Litres LPH 5875 4406 3525 2938 2518 2203 1958 1759 1602 1469 1356 1259  
130 U.S. Gals. GPH 1919 1439 1151 959 822 720 640 576 523 480 443 411  
492 Litres LPH 7263 5447 4358 3631 3113 2724 2421 2179 1981 1816 1676 1556  
345  
276  
230  
197  
747  
247  
173  
654  
216  
817  
288  
154  
581  
192  
726  
256  
138  
523  
173  
654  
230  
871  
288  
126  
476  
157  
594  
209  
792  
262  
115  
436  
144  
545  
192  
726  
240  
908  
291  
106  
402  
133  
503  
177  
670  
221  
838  
269  
99  
NATURAL/  
PROPANE  
BTH 120  
BTH 150  
BTH 199  
BTH 250  
BTH 300  
BTH 400  
BTH 500  
95%  
95%  
95%  
95%  
96%  
96%  
95%  
374  
123  
467  
164  
622  
206  
778  
250  
NATURAL/  
PROPANE  
44  
LPH 2179 1635 1308 1090 934  
575 460 384 329  
NATURAL/  
PROPANE  
58  
LPH 2904 2178 1743 1452 1245 1089 968  
720 576 480 411 360 320  
NATURAL/  
PROPANE  
73  
LPH 3632 2724 2179 1816 1557 1362 1211 1044 991  
699 582 499 436 388 349 318  
NATURAL/  
PROPANE  
88  
LPH 4406 3304 2644 2203 1888 1652 1469 1322 1201 1102 1017 945  
776 665 582 517 465 423 388 359 332  
NATURAL/  
PROPANE  
117  
NATURAL/  
PROPANE  
146  
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.  
SUGGESTED SPECIFICATION  
(Natural or Propane) gas water heater(s) shall be A. O. Smith Cyclone Xi model # _________ or equal, with up to 96% thermal efciency, a storage capacity of  
______ gallons, an input rating of __________ BTUs per hour, a recovery rating of ___________ gallons per hour (gph) at 100° F riseand 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 approvedfor 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 userinterface, 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 governingstorage-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 sealedcombustion 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 120ft) _______ 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 sizedthermal expansion tank) will  
void the warranty.  
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.  
Page 4 of 4  
ACGSS02407  
December 2007R  
Printed in U.S.A.  
 

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