A.O. Smith ATI-140H-P Technical Documents | Page 5

A.O. Smith Water Heater Technical Documents - ATI-140H-P.
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Introduction

Installation Manual

INTRODUCTION
• This manual provides information necessary for the installation, operation, and maintenance 

of the water heater

• The model description is listed on the rating plate which is attached to the side panel of the 

water heater

• Please read all installation instructions completely before installing this product

• If you have any problems or questions regarding this equipment, consult the manufacturer or 

its local representative

• This equipment is an on-demand, tankless water heater designed to efficiently supply endless 

hot water for your needs

• These highefficiencymodels have a built-in secondary heat exchanger that absorbs latent 

heat from the exhaust gas

• The 140 Indoor (T-H3M-DV) model is only to be installed indoors  The 140 Outdoor (T-H3M-

OS) model is only to be installed outdoors

• The principle behind tankless water heaters is simple:

*This diagram illustrates tankless water heater design concepts only and does not accurately 

represent the water heater’s physical description

1  A hot water tap is turned on

2  Water enters the heater

3  The water flow sensor detects the water flow

4  The computer initiates the fan motor and sends a signal to the igniter to create an ignition 

spark

5  The gas ignites and flames appear within the burner chamber

6  Water circulates through the heat exchanger and then gets hot

7  Using thermistors to measure temperatures throughout the water heater, the computer 

modulates the gas and water valves to ensure proper output water temperature

8  When the tap is turned off, the unit shuts down

Burners

Exhaust

Secondary

heat exchanger

Primary

heat exchanger

Igniter

Gas valve

Fan motor

Flow sensor

Condensate

drain port

Gas inlet

Cold water inlet

Thermistor

Hot water outlet

Thermistor

Intake port

Exhaust

Thermistor

Water control

valve

Computer

board

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