On-Demand Outdoor Water Heaters Electronic Connection

IMPORTANT!

With electrical power supplied to a on-demand water heater, it will not freeze in enviornments as cold as -30oF, 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	6
	Water Heaters
	Electronic Connection *
* Refer to On-Demand Accessories

and Model Applicability for electronic connection details.

Vacuum Breaker

Outdoor

On-Demand

Water Heater

Primary

Sub 1

Sub 2

Primary

Sub 1

Pressure Regulator

Set to 5 PSI Below

Street Pressure

Outdoor

On-Demand

Water Heater

Sub 2

Gas Supply Line

NOTE:

Pipes and fittings can be installed inside a pipe en- closure or recess box and packed with insulation for additional protection.

Cold Water Supply Line

Hot Water Supply

1/4 “ Minimum
Normally Open	S
Solenoid Valve

Route drain per local codes

NOTE:

outside building structure. These are indicated by being above the dashed line.

line should be located inside the building structure.

The vacuum breaker line should be located inside the building structure.

Normally Closed Solenoid Valve

(Full Size of Cold Water Supply Line)

Domestic Hot Water - Optional Freeze Protection

6 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

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-6-E

A.O. Smith 186965-001, 505 Series 100 manual On-Demand Outdoor Water Heaters Electronic Connection

Models: 705 Series 100 186965-001 505 Series 100 305 Series 100