A.O. Smith 505 Series 100, 705 Series 100, 305 Series 100 manual On-Demand Commercial Water Heaters

On-Demand
Equipment List	QTY
On-Demand Commercial	2
Water Heaters

Building Hot Water

Supply Line

Storage Tank

(No Burner or

Heating Element)

Submersible

Aquastat

(set @ 20°F below

On-Demand Temperature

Setting)

On-Demand		On-Demand	Set water heaters @ 20°F
	Water Heater	Water Heater	above storage tank Aquastat

Pump / Aquastat Control Wire

Gas Supply

Reference the section on Pump Sizing for Storage Tank Application.

Cold Water Supply Line

Expansion Tank

Domestic Hot Water - Backup Storage

2 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-2-T

32