A.O. Smith ATI-240H-N, ATI-240H-P, ATI-340H-N, ATI-340H-P, ATI-540H-N User Manual
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Residential / Commercial Gas
Tankless Water Heaters
TANKLESS HIGH EFFICIENCY CONDENSING WATER HEATERS
Ultra-Low NOx gas tankless water heaters with condensing technology featuring an unprecedented 0.95 Energy Factor which lowers operating costs and is environmentally friendly.
FEATURES:
CONTINUOUS MAXIMUM FLOW RATES UP TO 10.0 GPM
ENERGY STAR® QUALIFIED
AVAILABLE IN NATURAL GAS OR PROPANE (LP)
540 MODELS
•Can be used in residential and commercial applications
•Easy-link up to 4 heaters
•Multi-link up to 20 heaters
INDOOR MODEL
•Includes integrated temperature controls and advanced diagnostics to simplify troubleshooting
•Factory-installed power cord
OUTDOOR MODEL
•Includes a wall mount temperature remote controller and advanced diagnostics to simplify troubleshooting
DURABLE HEAT EXCHANGER:
•Primary heat exchanger is constructed of a commercial-grade copper that is more resilient to erosion. Copper is 25x better at heat transfer than stainless steel thus stabilizing outgoing water temperatures quicker.
•Secondary Heat Exchanger is made of Type 316L Stainless Steel to protect against corrosion.
COMMON VENT UP TO 8 UNITS
COMPLIES WITH LEAD FREE STANDARDS
SAFETY FEATURES:
•Air-Fuel Ratio (AFR) Sensor
•Exhaust & Water Temperature Safety Control
•Overheat Cut-Off Fuse
INTERNAL FREEZE PROTECTION SYSTEM
POWER DIRECT VENT DESIGN
•Category III or IV venting can be used
•Exhaust, 3” PVC Venting up to 70 Feet or 4” PVC Venting up to 100 Feet
•Provides flexible venting with PVC, CPVC, or ABS Pipe for Intake and Exhaust (solid core only). Canadian Installations Require ULCS636 Listed PVC or CPVC Pipe for Venting.
ACCESSORIES
•Pipe Cover
•Neutralizer Kit
•Isolation Valve Kits
•Concentric Termination
•Product Preservers® Anti-Scale System
•Multi-Unit Controller (540 Model Only)
•Commercial Remote Temperature Control (540 Model Only)
WARRANTY
•15-year limited warranty on heat exchanger in residential applications
•6-year limited warranty on heat exchanger in commercial applications
•5-year warranty on all parts
INDOOR MODELS
ATI-240, ATI-340, ATI-540
OUTDOOR MODELS
ATO-240, ATO-340, ATO-540
540 models only
ANSI Z21.10.3 |
CSA 4.3 |
©September 2016 A. O. Smith Corporation. All Rights Reserved |
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www.hotwater.com | 800-527-1953 Toll-Free USA | A. O. Smith Corporation | 500 Tennessee Waltz Parkway | Ashland City, TN 37015 |
AOSRG46835 |
Residential / Commercial Gas
Tankless Water Heaters
TANKLESS HIGH EFFICIENCY CONDENSING MODELS
Model |
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Gas Consumption Input |
Inlet Gas Pressure |
Energy |
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Type |
Minimum |
Maximum |
Minimum |
Maximum |
Factor |
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Number |
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(EF) |
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BTU/H |
BTU/H |
in. W.C. |
in. W.C. |
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Maximum |
Hot/Cold |
Gas |
Dimensions in Inches |
Unit |
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Weight |
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GPM* |
Connections |
Connection |
Height |
Width |
Depth |
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(lbs) |
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Indoor Models
ATI-240H-N |
Natural |
15,000 |
160,000 |
4.0 |
10.5 |
0.95 |
6.6 |
3/4” NPT |
3/4” NPT |
23-5/8 |
17-3/4 |
11-1/4 |
58 |
ATI-240H-P |
Propane |
13,000 |
160,000 |
8.0 |
14.0 |
0.95 |
6.6 |
3/4” NPT |
3/4” NPT |
23-5/9 |
17-3/4 |
11-1/4 |
58 |
ATI-340H-N |
Natural |
15,000 |
180,000 |
4.0 |
10.5 |
0.95 |
8 |
3/4” NPT |
3/4” NPT |
23-5/8 |
17-3/4 |
11-1/4 |
58 |
ATI-340H-P |
Propane |
13,000 |
180,000 |
8.0 |
14.0 |
0.95 |
8 |
3/4” NPT |
3/4” NPT |
23-5/8 |
17-3/4 |
11-1/4 |
58 |
ATI-540H-N |
Natural |
15,000 |
199,000 |
4.0 |
10.5 |
0.95 |
10 |
3/4” NPT |
3/4” NPT |
23-5/8 |
17-3/4 |
11-1/4 |
59 |
ATI-540H-P |
Propane |
13,000 |
199,000 |
8.0 |
14.0 |
0.95 |
10 |
3/4” NPT |
3/4” NPT |
23-5/8 |
17-3/4 |
11-1/4 |
59 |
Outdoor Models |
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ATO-240H-N |
Natural |
15,000 |
160,000 |
4.0 |
10.5 |
0.95 |
6.6 |
3/4” NPT |
3/4” NPT |
23-5/8 |
17-3/4 |
11-1/4 |
58 |
ATO-240H-P |
Propane |
13,000 |
160,000 |
8.0 |
14.0 |
0.95 |
6.6 |
3/4” NPT |
3/4” NPT |
23-5/8 |
17-3/4 |
11-1/4 |
58 |
ATO-340H-N |
Natural |
15,000 |
180,000 |
4.0 |
10.5 |
0.95 |
8 |
3/4” NPT |
3/4” NPT |
23-5/8 |
17-3/4 |
11-1/4 |
58 |
ATO-340H-P |
Propane |
13,000 |
180,000 |
8.0 |
14.0 |
0.95 |
8 |
3/4” NPT |
3/4” NPT |
23-5/8 |
17-3/4 |
11-1/4 |
58 |
ATO-540H-N |
Natural |
15,000 |
199,000 |
4.0 |
10.5 |
0.95 |
10 |
3/4” NPT |
3/4” NPT |
23-5/8 |
17-3/4 |
11-1/4 |
59 |
ATO-540H-P |
Propane |
13,000 |
199,000 |
8.0 |
14.0 |
0.95 |
10 |
3/4” NPT |
3/4” NPT |
23-5/8 |
17-3/4 |
11-1/4 |
59 |
15-150 PSI Water Pressure. 40 PSI or above recommended for maximum flow.
*Current numbers based on factory testing; 0.5 GPM for activation; 0.4 GPM required for continuous fire after initial ignition. Indoor models are certified from sea level to 10,100 ft. elevations. Outdoor models are certified from sea level to 6,000 ft. elevation.
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AOSRG46835
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