A.O. Smith ATI-540H-N Technical Documents

A.O. Smith Water Heater Technical Documents - ATI-540H-N.
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Residential/Commercial Gas
Tankless Water Heaters

FEATURES

ULTRA-LOW NOx CONDENSING TECHNOLOGY PROVIDES UNPRECEDENTED
0.95 ENERGY FACTOR

DURABLE HEAT EXCHANGER

■ Primary Heat Exchanger is constructed of HRS35, a Commercial-Grade Copper that is more 

resilient to erosion. HRS35 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

CONTINUOUS MAXIMUM FLOW RATES UP TO 10.0 GPM

ENERGY STAR® QUALIFIED

AVAILABLE IN NATURAL GAS OR PROPANE (LP)

ATI 540H & AT0 540H CAN BE USED IN BOTH RESIDENTIAL AND
COMMERCIAL APPLICATIONS

ELECTRONIC IGNITION - NO PILOT LIGHT

INDOOR MODEL - INCLUDES A BUILT-IN TEMPERATURE CONTROLLER AND
ADVANCED DIAGNOSTICS TO SIMPLIFY TROUBLESHOOTING

OUTDOOR MODEL - INCLUDES A WALL MOUNT TEMPERATURE REMOTE
CONTROLLER AND ADVANCED DIAGNOSTICS TO SIMPLIFY TROUBLESHOOTING

FACTORY-INSTALLED POWER CORD INCLUDED FOR INDOOR MODELS

EASY-LINK UP TO 4 UNITS (540H MODELS ONLY)

■ With no additional parts or accessories needed

MULTI-LINK UP TO 20 UNITS (540H MODELS ONLY)

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

■ 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.

■ Category IV Stainless Steel venting can also be used

ACCESSORIES

■ Pipe Cover
■ Neutralizer Kit
■ Isolation Valve Kits
■ Concentric Termination

WARRANTY

■ 15-year limited warranty on heat exchanger in residential applications
■ 10-year limited warranty on heat exchanger in commercial applications
■ 5-year limited warranty on all parts

INDOOR MODELS

ATI-240H, ATI-340H, ATI-540H

OUTDOOR MODELS

ATO-240H, ATO-340H, ATO-540H

ANSI Z21.10.3

CSA 4.3

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AOSRG46835

TANKLESS HIGH EFFICIENCY
CONDENSING MODELS

®

540 model

only

Revised March 2013

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