IMPORTANT!

With electrical power supplied to a on-demand water heater, it will not freeze in enviornments as cold as -300F, when protected from direct wind exposure.

In the event of a power failure at temperatures below freezing, the water heater should be drained of all water to prevent freezing damage.

The unit may be drained manually or through the installation of the Optional solenoid valves as shown.

The electrical connections for the two solenoid valves should be tied to the 120V power terminals provided on the PC Board of the water heater.

When the electrical power to the water heater fails, the cold water supply solenoid valve closes, stopping the flow of water into the heater, and the drain down solenoid valve opens, allowing the water heater and associated piping to drain. Ensure that you run the drain for the solenoids per local codes.

On-Demand

 

Equipment List

QTY

On-Demand Outdoor

3

Water Heaters

 

Electronic Connection *

*Refer to On-Demand Accessories and Model Applicability for electronic connection details.

Vacuum

 

 

Breaker

Outdoor

Outdoor

 

 

On-Demand

On-Demand

 

Water Heater

Water Heater

 

Primary

Sub 1

Outdoor

On-Demand

Water Heater

Sub 2

NOTE:

enclosure or recess box and packed with insulation for additional protection.

 

Gas Supply Line

 

Normally Closed Solenoid Valve

Hot Water

(Full Size of Cold Water Supply Line)

Supply Line

S

 

NOTE:

Cold Water Supply Line

outside building structure. These are indicated

 

 

 

1/4 “ Minimum

by being above the dashed line.

 

 

S

Normally Open

line should be located inside the building

 

 

 

Solenoid Valve

 

 

 

 

 

 

 

structure.

Route drain

 

 

 

 

 

 

 

 

 

 

The vacuum breaker line should be located inside

per local codes

 

the building structure.

 

 

 

 

Domestic Hot Water - Optional Freeze Protection

3 Outdoor On-Demand Water Heater

Preferred Piping Installation

Key

3/4" Ball Valve

3/4" Union

Check Valve

Pressure Relief Valve

Pressure Regulator

Circulating Pump

S

Boiler Drain Valve

Solenoid Valve

Mixing Valve

NOTE: This drawing is not intended to describe a complete system and is not a replacement for a pro- fessional engineering drawing. It is intended only as a guide and does not imply compliance with local building code requirements. Confer with local building officials before installation. The Contractor or engineer is to determine the necessary components and configuration of the particular system to be in- stalled. It is the responsibility of the engineer or contractor to ensure that the installation is in accordance with all local building codes.

Drawing Date:

September 07, 2008

Drawing Number:

H-3-E

22

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A.O. Smith 305 Series 100, 505 Series 100, 705 Series 100, 186965-001 manual Gas Supply Line

705 Series 100, 186965-001, 505 Series 100, 305 Series 100 specifications

A.O. Smith is a leading manufacturer of water heaters and has long been recognized for its commitment to innovation and quality. Among their diverse product lineup, the 305 Series 100, 505 Series 100, 186965-001, and 705 Series 100 models stand out as reliable solutions for both residential and commercial water heating needs.

The A.O. Smith 305 Series 100 is known for its impressive energy efficiency. Utilizing advanced insulation technologies, this model minimizes heat loss, ensuring that water remains heated for longer periods. It features a durable tank construction, often built with glass-coated technology that prevents corrosion and extends the lifespan of the unit. This series also comes equipped with a user-friendly digital thermostat, allowing homeowners to set the desired temperature easily.

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Lastly, the 705 Series 100 exemplifies versatility and high efficiency. With options for both gas and electric heating, it accommodates a wide range of consumer needs. It incorporates advanced safety elements, such as flame arrestors and high-temperature limit switches, which prioritize user safety. Additionally, the 705 Series is designed for easy installation and maintenance, enabling homeowners to enjoy peace of mind.

In summary, the A.O. Smith 305, 505, 186965-001, and 705 Series 100 all exemplify the brand's dedication to engineering excellence. With their unique features, cutting-edge technologies, and design characteristics, these models cater to various heating needs, delivering reliable hot water solutions for homes and businesses alike.