A. O. Smith BTH-150 User Manual

Commercial Gas Water Heaters

BTH-120

UP TO 96% THERMAL EFFICIENCY, DIRECT VENT

FEATURES

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 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 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

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Exclusive A. O. Smith designed control system

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Provides detailed water heater status information

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Precise temperature control

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Built-in diagnostics

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Run history information

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Cyclone water heaters are iCOMM™ compatible and can be monitored from remote locations.

Call 1.888.WATER02 for more information.

SUBMERGED COMBUSTION CHAMBER,
WITH HELICAL HEAT EXCHANGER COIL

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Positioned in center of tank, surrounded by water to virtually

eliminate radiant heat loss from chamber

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Spiral heat exchanger keeps hot burner gases swirling, uses centrifugal

force to maximize efficiency of heat transfer to water in tank

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Spiral shaped heat exchanger reduces the accumulation of lime scale; maintains higher

effi ciency performance over time.

through

BTH-500

POWERED ANODES STANDARD ON ALL MODELS

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Provides long-lasting tank protection in varying water conditions

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Anodes are of a permanent design and do not require replacement unless damaged

PERMAGLAS

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Exclusive process provides superior protection against corrosion

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Both sides of heat exchanger coil are lined for protection against flue gas

condensate inside coil

®

ULTRA COAT™GLASS LINING

BTH-120-250

MECHANICAL VENTING VERSATILITY

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Conventional power- venting or power- direct venting

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Vents vertically or through sidewall

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Direct-vent intake and exhaust pipe can terminate separately outside building,

or through single opening, using concentric vent assembly

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Uses inexpensive PVC, CPVC or ABS pipe for intake and exhaust. Canadian installations

require ULC S636 listed PVC or CPVC pipe for intake and exhaust.

BTH-300-500

(optional)

HIGH EFFICIENCY PRE-MIX POWERED BURNER

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Down-fired pre-mix burner provides optimum efficiency and quiet operation

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Top-mounted radial burner design ensures optimum combustion effi ciency

Revised August 2011

Low Lead Compliant

Low Lead Compliant

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AOSCG10200

Commercial Gas Water Heaters

OTHER CYCLONE Xi FEATURES

SPACE-SAVING DESIGN FOR INSTALLATION FLEXIBILITY

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Reduced footprint, ease of service, protection from water damage in case of flooding

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Easy to remove top cover for convenient access to serviceable parts

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0˝ installation clearances on sides and rear, 1-1/2˝ installation clearance on top, 4˝ alcove installation clearance in front

Handhole Cleanout of unit

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Handhole cleanout allows easy access to tank interior for cleaning

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0˝ clearance to combustibles, approved for installation on combustible floors

CODES AND STANDARDS

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CSA certifi ed and ASME rated T&P relief valve

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Maximum hydrostatic working pressure: 160 PSI

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BTH-120-250 Models are design-certifi ed by CSA International, according to ANSI Z21.10.3 - CSA 4.3 Standards governing

storage-type water heaters.

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BTH-300-500 Models are design-certifi ed by Underwriter’s Laboratories (UL), Inc., according to ANSI Z21.10.3 - CSA 4.3

standards governing storage-type water heaters.

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Meets or exceeds the thermal effi ciency and standby loss reqiurements of the U.S. Department of Energy and current edition

ASHRAE/IESNA 90.1

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Design-certified by Underwriter’s Laboratories (UL), Inc. to NSF standard 5

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Complies with SCAQMD Rule 1146.2 and other Air Quality Management Districts with similar requirements for low NOx emissions

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ASME tank construction optional on all models.

THREE-YEAR LIMITED TANK WARRANTY

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For complete warranty details, consult written warranty shipped with heater, or contact A. O. Smith (5-year extended warranty

is optional).

INSTALLATION CONSIDERATIONS

1. Condensate Drain – This is a fully condensing water heater and should be located near a drain to permit proper
disposal of condensate.

2. Vent Termination – Exhaust gases of this water heater are less than 140°F. In cold climates water vapor in flue
gases will condense into a cloud of vapor where the vent exits the building. This vapor can gradually discolor exterior
building surfaces. Vent termination should be located where this vapor cloud and potential discoloration are not a
concern. Extending the vent termination up to 6 ˝ from the wall helps vapor from being trapped along a building’s face.
To avoid this problem, the vent can be terminated on the roof. Always locate vent termination above the maximum
snowline, and do not locate vent termination above a walkway.

3. Air Intake – In cold climates, air intake should be located at least four feet from the vent termination of the water
heater and any other appliance vents that discharge moisture-laden air (such as clothes dryers). This will help prevent
freeze-over of the intake screen required to prevent foreign objects from entering the intake pipe. Air intake should be
located above the maximum snowline.

4. Blockage Sensors – The water heater is equipped with sensors to shut it down if blockage of vent or air intake occurs.
The water heater control system will display detailed diagnostic information on the LCD screen to help service technicians
quickly locate and correct the problem.

5. Noise – Vent terminal should be located away from bedroom windows or other areas where blower noise will be
objectionable. Avoid venting into corners or confined areas, which will amplify sound. Anchoring intake or vent pipe
to walls or ceilings can cause noise to be transmitted to living areas, and isolation mounts should be used where
anchoring is required.

6. Optional Concentric Vent Kit - Helps to minimize unsightly wall/roof penetrations.
BTH-120 - 300 vent kit p/n 9006328005
BTH-400 - 500 vent kit p/n 9006144005

For Technical Information and Automated Fax Service, call 800-527-1953. A. O. Smith Corporation reserves the right to make product changes or improvements without prior notice.

Revised August 2011

www.hotwater.com

AOSCG10200

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