A.O. Smith BTH-120A, BTH-150A, BTH-199A, BTH-250A, BTH-300A User Manual
...
Commercial Gas
Water Heaters
CYCLONE® Mxi MODULATING
MODULATING BURNER ADVANCES THE CYCLONE TO HIGHER LEVELS OF EFFICIENCY
The full line of A. O. Smith Cyclone Mxi condensing water heaters has been designed to provide
years of dependable service and feature industry leading technology. Models are available from
120,000 to 500,000 Btu/h and all deliver thermal efficiencies of 95% and higher. The unique helical
coil heat exchanger limits weld joints for optimal service life while maximizing heat transfer.
Cyclone is the industry leader in high efficiency commercial water heating. The current Mxi
modulating models adjust firing rate to the specific demand further increasing efficiency and
money savings.
INTELLIGENT CONTROL SYSTEM
WITH LCD DISPLAY AND iCOMM
CONNECTIVITY
• Exclusive A. O. Smith designed touch display
control system
• Provides detailed water heater status
information
• Precise temperature control adjustable from 90
to 180 degrees
• Built-in diagnostics
• Run history information
• Cyclone
®
Mxi Modulating water heaters
are compatible with the iCOMM
monitoring system. Call 1.888.928.3702 for
information.
™
remote
COMING SPRING 2017
• Remote monitoring capability utilizing the
iCOMM app. Wi-Fi connectivity kit requited for
models 120-250, standard on models 300-500.
SUBMERGED COMBUSTION CHAMBER,
WITH HELICAL HEAT EXCHANGER COIL
• Positioned in center of tank, surrounded by
water to virtually eliminate radiant heat loss
from chamber
• Direct spark ignition
• Spiral heat exchanger keeps hot burner gases
swirling, uses centrifugal force to maximize
efficiency of heat transfer to water in tank
• Spiral heat exchanger reduces lime scale
from forming on water-side surfaces, which
maintains energy efficiency over time
POWERED ANODES STANDARD ON ALL
MODELS
• Provides long-lasting tank protection in varying
water conditions
• Powered anodes are non-sacrificial
• Automatically adjusts output needed to
properly protect the tank
PERMAGLAS® ULTRA COAT™ GLASS
LINING
• Glass coating is applied using a liquid slush
coating technique to ensure uniform coating
• Heat exchanger coil is glassed both externally
and internally for optimum protection
MECHANICAL VENTING VERSATILITY
• Conventional power venting or direct venting
• Vents vertically or through a sidewall
• Front located exhaust and condensate
connections allow for easy install and access
• Vents with low cost PVC Schedule 40 intake
and exhaust pipe. Approved for optional CPVC
Schedule 40, Polypropylene and AL29-4C
stainless steel vent materials
• Direct-vent intake and exhaust pipe can
terminate separately outside building or
through single opening, using concentric vent
assembly
• Canadian installations require ULC S636 PVC/
CPVC, ULC S636 Polypropylene and AL29-4C
stainless steel pipe for intake and exhaust
HIGH EFFICIENCY MODULATING PREMIX POWERED BURNER
• Down-fired pre-mix burner provides optimum
efficiency and quiet operation
• Top-mounted burner position prevents
condensation from affecting burner operation
3-YEAR LIMITED TANK / 1-YEAR
LIMITED PARTS WARRANTY
• For complete warranty information, consult
written warranty or go to hotwater.com.
BTH-120(A) THROUGH BTH-500(A)
MODEL SHOWN:
BTH-199(A) SERIES 300/301
© April 2017 A. O. Smith Corporation. All Rights Reserved
www.hotwater.com | 800-527-1953 Toll-Free USA | A. O. Smith Corporation | 500 Tennessee Waltz Parkway | Ashland City, TN 37015
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AOSCG10210
Commercial Gas
Water Heaters
OTHER FEATURES:
SPACE-SAVING DESIGN FOR INSTALLATION FLEXIBILITY
• Easy-to-remove top cover for convenient access to serviceable parts
• 0˝ installation clearances on sides and rear, 1-1/2˝ installation
clearance on top
• Handhole cleanout allows easy access to tank interior for cleaning
• 0˝ clearance to combustibles, approved for installation on
combustible floors
VENT REQUIREMENTS FOR BTH 120(A) - 250(A)
Number of 90°
Elbows Installed
One (1) 45 feet (13.7 meters) 115 feet (35 meters)
Two (2) 40 feet (12.2 meters) 110 feet (33.5 meters)
Three (3) 35 feet (10.7 meters) 105 feet (32 meters)
Four (4) 30 feet (9.1 meters) 100 feet (30.5 meters)
Five (5) N/A 95 feet (29 meters)
Six (6) N/A 90 feet (27.4 meters)
3 Inch Pipe 4 Inch Pipe
Maximum Feet
(Meters)
Maximum Feet
(Meters)
CODES AND STANDARDS
• CSA certified and ASME rated T&P relief valve
• Maximum hydrostatic working pressure: 160 psi
• All models are design certified by Underwriters Laboratories (UL),
Inc., to ANSI Z21.10.3 - CSA 4.3 Standards
• Meets the thermal efficiency and standby loss requirements of the
U.S. Department of Energy and current edition ASHRAE/IES 90.1
• Design Certified by Underwriters Laboratories to NSF standard 5 for
180°F (62°C) water
• Complies with SCAQMD Rule 1146.2 and other Air Quality
Management Districts with similar requirements for ultra low-NOx
emissions
• ASME tank construction optional on 120-500 model sizes
VENT REQUIREMENTS FOR BTH 300(A) - 500(A)
Number of 90°
Elbows Installed
One (1) 65 feet (19.8 meters) 115 feet (35 meters)
Two (2) 60 feet (18.2 meters) 110 feet (33.5 meters)
Three (3) 55 feet (16.8 meters) 105 feet (32 meters)
Four (4) 50 feet (15.2 meters) 100 feet (30.5 meters)
Five (5) 45 feet (13.7 meters) 95 feet (29 meters)
Six (6) 40 feet (12.2 meters) 90 feet (27.4 meters)
4 Inch Pipe 6 Inch Pipe
Maximum Feet
(Meters)
Maximum Feet
(Meters)
GAS PRESSURE REQUIREMENTS
Model Number
BTH-120(A) 0"W.C. (0 kPa) 0"W.C. (0 kPa) 3.5"W.C. (1.10 kPa) 8.5"W.C. (2.12 kPa) 14"W.C. (3.49 kPa) 14"W.C. (3.49 kPa)
BTH-150(A) 0"W.C. (0 kPa) 0"W.C. (0 kPa) 3.5"W.C. (1.10 kPa) 8.5"W.C. (2.12 kPa) 14"W.C. (3.49 kPa) 14"W.C. (3.49 kPa)
BTH-199(A) 0"W.C. (0 kPa) 0"W.C. (0 kPa) 3.5"W.C. (1.10 kPa) 8.5"W.C. (2.12 kPa) 14"W.C. (3.49 kPa) 14"W.C. (3.49 kPa)
BTH-250(A) 0"W.C. (0 kPa) 0"W.C. (0 kPa) 3.5"W.C. (1.10 kPa) 8.5"W.C. (2.12 kPa) 14"W.C. (3.49 kPa) 14"W.C. (3.49 kPa)
BTH-300(A) 0"W.C. (0 kPa) 0"W.C. (0 kPa) 4.8"W.C. (1.19 kPa) 8.5"W.C. (2.12 kPa) 14"W.C. (3.49 kPa) 14"W.C. (3.49 kPa)
BTH-400(A) 0"W.C. (0 kPa) 0"W.C. (0 kPa) 4.8"W.C. (1.19 kPa) 8.5"W.C. (2.12 kPa) 14"W.C. (3.49 kPa) 14"W.C. (3.49 kPa)
BTH-500(A) 0"W.C. (0 kPa) 0"W.C. (0 kPa) 4.8"W.C. (1.19 kPa) 8.5"W.C. (2.12 kPa) 14"W.C. (3.49 kPa) 14"W.C. (3.49 kPa)
Depending on the installed equivalent length, and/or the number of appliances connected, the supply gas line size may need to be increased beyond the minimum required size.
Manifold Pressure Minimum Supply Pressure Maximum Supply Pressure
Natural Gas Propane Gas Natural Gas Propane Gas Natural Gas Propane Gas
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AOSCG10210
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