A.O. Smith ACI-CRS-24B2B-N, ACI-CRS-24B2B-P, ACI-CRS-34B2B-N, ACI-CRS-34B2B-P, ACI-CRS-36B2B-N User Manual
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TANKLESS FREE STANDING BACK-TO-BACK
LIGHTWEIGHT
• Constructed of sturdy metal frame
• Utilizes the industry’s lightest 199,000 BTU
high efficiency condensing tankless heater
EXPANDABLE
• Multiple design and installation
configurations
• Up to 1,194,000 BTU on a single rack
system
• Able to link up to 20 heaters together with
multi-link system
Commercial Tankless
Rack System
REDUNDANCY
• Multiple combustion systems provide peace
of mind
• Easily isolate a unit for maintenance which
extends the life of the heaters
EASY FIELD INSTALLATION
• Reduce installation costs with three simple
connections (cold water, hot water and gas)
EASILY INTEGRATE STORAGE
• As the world’s largest water heater
manufacturer, we can easily integrate
storage into the design
WARRANTY
• 6 year limited heat exchanger
• 5 year limited tankless parts
• 1-year limited rack parts
© July 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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AOSCG14004
Commercial Tankless
Rack System
Model Number
Indoor Models
ACI-CRS-24B2B-N 2 Natural 15,000 398,000 15.2 12.6 10.8 9.4 8.4 7.6
ACI-CRS-24B2B-P 2 Propane 13,000 398,000 15.2 12.6 10.8 9.4 8.4 7.6
ACI-CRS-34B2B-N 3 Natural 15,000 597,000 22.8 18.9 16.2 14.1 12.6 11.4
ACI-CRS-34B2B-P 3 Propane 13,000 597,000 22.8 18.9 16.2 14.1 12.6 11.4
ACI-CRS-36B2B-N 3 Natural 15,000 597,000 22.8 18.9 16.2 14.1 12.6 11.4
ACI-CRS-36B2B-P 3 Propane 13,000 597,000 22.8 18.9 16.2 14.1 12.6 11.4
ACI-CRS-44B2B-N 4 Natural 15,000 796,000 30.4 25.2 21.6 18.8 16.8 15.2
ACI-CRS-44B2B-P 4 Propane 13,000 796,000 30.4 25.2 21.6 18.8 16.8 15.2
ACI-CRS-46B2B-N 4 Natural 15,000 796,000 30.4 25.2 21.6 18.8 16.8 15.2
ACI-CRS-46B2B-P 4 Propane 13,000 796,000 30.4 25.2 21.6 18.8 16.8 15.2
ACI-CRS-56B2B-N 5 Natural 15,000 995,000 38 31.5 27 23.5 21 19
ACI-CRS-56B2B-P 5 Propane 13,000 995,000 38 31.5 27 23.5 21 19
Number of
Heaters
Configurations Fuel Type
Gas Consumption Input Max Flow (GPM)
Minimum
BTU/h
Maximum
BTU/h
50°F Rise 60°F Rise 70°F Rise 80°F Rise 90°F Rise
100°F
Rise
ACI-CRS-66B2B-N 6 Natural 15,000 1,194,000 45.6 37.8 32.4 28.2 25.2 22.8
ACI-CRS-66B2B-P 6 Propane 13,000 1,194,000 45.6 37.8 32.4 28.2 25.2 22.8
Outdoor Models
ACO-CRS-24B2B-N 2 Natural 15,000 398,000 15.2 12.6 10.8 9.4 8.4 7.6
ACO-CRS-24B2B-P 2 Propane 13,000 398,000 15.2 12.6 10.8 9.4 8.4 7.6
ACO-CRS-34B2B-N 3 Natural 15,000 597,000 22.8 18.9 16.2 14.1 12.6 11.4
ACO-CRS-34B2B-P 3 Propane 13,000 597,000 22.8 18.9 16.2 14.1 12.6 11.4
ACO-CRS-36B2B-N 3 Natural 15,000 597,000 22.8 18.9 16.2 14.1 12.6 11.4
ACO-CRS-36B2B-P 3 Propane 13,000 597,000 22.8 18.9 16.2 14.1 12.6 11.4
ACO-CRS-44B2B-N 4 Natural 15,000 796,000 30.4 25.2 21.6 18.8 16.8 15.2
ACO-CRS-44B2B-P 4 Propane 13,000 796,000 30.4 25.2 21.6 18.8 16.8 15.2
ACO-CRS-46B2B-N 4 Natural 15,000 796,000 30.4 25.2 21.6 18.8 16.8 15.2
ACO-CRS-46B2B-P 4 Propane 13,000 796,000 30.4 25.2 21.6 18.8 16.8 15.2
ACO-CRS-56B2B-N 5 Natural 15,000 995,000 38 31.5 27 23.5 21 19
ACO-CRS-56B2B-P 5 Propane 13,000 995,000 38 31.5 27 23.5 21 19
ACO-CRS-66B2B-N 6 Natural 15,000 1,194,000 45.6 37.8 32.4 28.2 25.2 22.8
ACO-CRS-66B2B-P 6 Propane 13,000 1,194,000 45.6 37.8 32.4 28.2 25.2 22.8
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AOSCG14004
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