A.O. Smith ATI-705N, ATO-705AN, ATI-505N, ATO-705N, ATO-305N, ATO-505N, ATI-705AN, ATI-305N User Manual

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A. O. Smith On-Demand

Gas Water Heaters

Each A. O. Smith on-demandwater heater is designed for a specific application. Consult your sales representative or contact A. O. Smith for specifications and recommendations on which model is right for specific requirements.

INNOVATION ON DEMAND

A. O. Smith’s complete line of tankless gas water heaters

Model Specifications

 

BTU Input

 

 

 

Approximate

Model

Natural / Propane

 

Hot Water Output (GPM)

 

Shipping

Number

Minimum

Maximum

Maximum

45º F Rise

77º F Rise

Weight (lbs)

INDOOR MODELS

 

 

 

 

 

 

ATI-305N

15,000

199,000/190,000

5.3

5.3

4.2

50

 

 

 

 

 

 

 

ATI-505N

15,000

199,000/190,000

8.5

7.4/7.1

4.2

50

 

 

 

 

 

 

 

ATI-705N

19,000

237,000

9.8

8.8

5.1

55

 

 

 

 

 

 

 

ATI-705AN*

19,000

237,000

9.8

8.8

5.1

55

 

 

 

 

 

 

 

OUTDOOR MODELS

 

 

 

 

 

 

ATO-305N

15,000

199,000

5.3

5.3

4.2

50

 

 

 

 

 

 

 

ATO-505N

15,000

199,000

8.5

7.3

4.2

50

 

 

 

 

 

 

 

ATO-705N

19,000

237,000

9.8

8.7

5.1

55

 

 

 

 

 

 

 

ATO-705AN*

19,000

237,000

9.8

8.7

5.1

55

 

 

 

 

 

 

 

* 705A models are ASME Certified.

For propane, change “N” to “P” in model number (ATI-305P).

500 Tennessee Waltz Parkway Ashland City, TN 37015

www.hotwater.com

AMGBROO107 ©2007 A. O. Smith Corporation

A. O. Smith reserves the right to make product changes or improvements at any time without notice.

Printed in U.S.A

SJanuaryeptembe2008Rr 2008R

 

 

 

 

 

 

 

A. O. Smith On-Demand

Gas Water Heaters

Endless Hot Water. Endless Innovation.

Trust the innovation leader to give you more choices in on-demandwater heating. A. O. Smith’s comprehensive line supplies endless hot water when you ask for it...with high efficiency that saves money on both residential and commercial applications.

Product Features:

Innovative Technology

Indoor and outdoor installation options

Continuous hot water on demand (up to 9.8 GPM)

Whole house water heating solution

Direct electronic ignition – no pilot light

On-boarddiagnostics and safety monitoring

Interior sealed combustion

(does not use interior combustion air)

Applicable for residential hydronic heating applications

Excellent Performance

12-yearlimited warranty on heat exchanger,5-yearwarranty on all parts

Can be installed outdoors, saving valuable indoor square footage

Energy Efficiency

Up to 84% thermal efficiency, providing significant energy cost savings

Sleek Design

Smooth pleasant lines and rounded corners

Matching pipe cover available for finished appearance

Commercial

Application Features:

ASME Certified

Hot water capacity of 0.6 – 9.8 GPM

Min. – Max. input: 19,000 – 237,000 BTU

Max. temperature: 185°F with Commercial Controller

Ideal for small restaurants, multifamily housing, hair salons and spas, laundromats, car washes and other limited commercial needs

In Use Indicator Light

Remote

Controller

All models come with a Remote controller that can set the temperature within a specific range.

Temperature Display

Shows the temp setting

Error Codes

When a fault is detected an error code flashes at the temperature setting

Indicates hot water is being supplied (a tap is open)

Priority Indicator

Indicates that this controller is setting the temperature

Priority Button

Priority can be changed to another controller if desired

Thermostat

On/Off Button

Increases/decreases temp setting

Will turn the water heater on/off

 

Model Selection Guide

Ground water temperature factor.

The temperature of incoming ground water (cold water inlet temperature) varies greatly throughout the U.S. and also fluctuates with change of season. The temperature of water as it enters the water heater will determine the amount of “temperature rise” required to achieve the desired hot water outlet temperature (120°F is recommended).

The best way to measure your incoming ground water temperature is to use a thermometer to measure cold water temperature during the coldest season of the year. To simplify the process, use this map to determine whether your installation location is in the Southern Zone, Central Zone or Northern Zone.

Average Ground Water Temperatures

SOUTHERN ZONE

 

CENTRAL ZONE

 

NORTHERN ZONE

 

 

 

 

 

Average Ground Water

 

Average Ground Water

 

Average Ground Water

Temperature: 62°F to 77°F

 

Temperature: 52°F to 61°F

 

Temperature: 37°F to 51°F

 

 

 

 

 

Peak hot water demand.

The next step is to determine how much hot water will be required during the busiest usage period (“peak demand”). To use the chart, consider all appliances and fixtures that use hot water including lavatory faucets, kitchen faucets, washing machines, dishwashers, showers and bathtubs. Be sure to determine how many appliances and fixtures will be used at the same time (“peak demand”).

Appliances or fixtures

 

 

Ground Water Temperature Zone

 

in simultaneous use

 

 

 

 

 

 

 

 

during peak demand

 

Southern Zone

 

 

Central Zone

 

 

Northern Zone

1

 

305 or 505

 

 

305 or 505

305 or 505

 

 

 

 

 

 

 

 

 

2

 

305 or 505

 

 

305 or 505

305 or 505

3

 

505 or 705

 

 

(2) 505 or 705

(2) 505

 

 

 

 

 

 

 

 

 

4

 

(2) 505

(2) 505

 

 

(2) 505

 

 

 

 

 

 

 

 

 

5

 

(2) 505

(2) 705

 

 

(2) 705

 

 

 

 

 

 

 

 

 

6 or more

Multi-system

 

 

Multi-system

Multi-system

*Note: This selection guide is based on 120°F outlet water temperature.