A.O. Smith ATO-240H-P Technical Documents

A.O. Smith Water Heater Technical Documents - ATO-240H-P.
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Residential/Commercial Gas
Tankless Water Heaters

FEATURES

CONDENSING TECHNOLOGY PROVIDES UNPRECEDENTED

0.95 ENERGY FACTOR

DURABLE HEAT EXCHANGERS

Primary Heat Exchanger is constructed of HRS35 Commercial-Grade Copper which is more
resilient against erosion
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 CAN BE USED IN BOTH RESIDENTIAL AND
COMMERCIAL APPLICATIONS

ELECTRONIC IGNITION - NO PILOT LIGHT

INCLUDES A BUILT-IN TEMPERATURE CONTROLLER AND
ADVANCED DIAGNOSTICS FOR EASY TROUBLESHOOTING

FACTORY-INSTALLED POWER CORD

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

With no additional parts or accessories needed using built-in Easy-Link System

MULTI-LINK UP TO 20 UNITS (540H MODELS ONLY) WITH A TM-MC02

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 ULC s636 approved PVC or CPVC or polypropylene for Intake
and Exhaust (solid core only).
Category III Stainless Steel venting can also be used

ACCESSORIES

Pipe Cover
Neutralizer Kit
Isolation Valve Kits (includes Pressure Relief Valve)
Concentric Termination

WARRANTY

15-year limited warranty on heat exchanger in residential applications

-year limited warranty on heat exchanger in commercial applications

5-year limited warranty on all parts

ATI-240H
ATI-340H
ATI-540H

ANSI Z21.10.3

CSA 4.3

Page 1 of 4

CANRG46835

TANKLESS HIGH EFFICIENCY

CONDENSING MODELS

®

540 model

only

www.hotwatercanada.ca

May 2013

10

PRESSURE LOSS

Residential/Commercial Gas
Tankless Water Heaters

Page 4 of 4

www.hotwatercanada.ca

CANRG46835

For Technical Information call

A. O. Smith Corporation reserves the right to make product changes or improvements without prior notice.

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Flow rate (GPM)

Set temperature 125˚F (52˚C) or lower
Set temperature 130˚F (55˚C) or higher 

S

540H

Pressure Loss

Flow Rate (GPM)

Pressure Loss

Flow Rate (GPM)

Pressure Loss

Flow Rate (GPM)

Specification

Water heater(s) shal be Model_________________ as manufactured by A. O. Smith Water Heaters, shal be a copper coil integral fin and tube construction with quick release brass or bronze waterways. Heater(s)

wil be factory assembled and tested.
The heater shall be vented with 3” or 4” ULC s636 approved PVC or CPVC or polypropylene vent pipe, or stainless steel Category III vent pipe at a distance not to exceed 70’ (equivalent) for 3” vent or 100’ 
(equivalent) for 4”vent, terminating vertically or horizontally as prescribed. Intake air pipe may be of such material as PVC or CPVC, galvanized B-Vent, corrugated aluminum or stainless steel, or Category IV 
stainless steel not to exceed 70’ (equivalent) for 3” vent or 100’ (equivalent) for 4” vent.

The heater(s) shall be controlled by an onboard solid-state printed circuit board monitoring incoming and outgoing temperatures with factory installed thermistors, sensing and controlling flow rate to set point
temperature, controlling both air and gas mixture inputs to maintain thermal combustion efficiency. The heater(s) shall also consist of inline fusing, a spark ignition and sensor system, aluminized stainless steel
burners, an air-fuel ratio sensor, a hi-limit temperature switch, modulating and proportional gas valves, a freeze protection sensor with ceramic heating blocks, and an overheat cutoff fuse.

The water heater(s) shall be CSA listed, exceed the energy efficiency requirements of ASHRAE 90.1b-1992, and shall comply with SCAQMD Rule 1146.2 Ultra-Low NOx Standards.

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1-888-479-8324.

May 2013

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