A.O. Smith 505 Series 100 用户手册

Drawing Number:

Drawing Date:

September 07, 2008

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.

25

On-Demand
Equipment List 

QTY

On-Demand 

        1

Water Heater

Domestic Hot Water - Circulation Systems

1 On-Demand Water Heater
Optional Piping Installation

Pump should be controlled by an Aquastat, 
Timer or Combination Aquastat and Timer.

Pump to be sized to maintain circulation 
loop temperature.

The pump should be sized to overcome the 
pressure loss through the tank water heater, 
and supply and return plumbing in the 
circulation loop.  Reference the section 
Pump Sizing for Circulation.

Pump to be of bronze or stainless construc-
tion.

G as S upply

(Optional)
2-6 Gallon
Storage Tank

(To eliminate cold water
sandwich e ect caused by
fre quent On/O

operation)

Expansion Tank

Minimum 3/4 “ Cold 
Water Supply Line

Minimum 3/4 “ Hot 
Water Supply Line

Building Outlets

Aquastat Connection

Key

Pressure Relief  Valve

Check Valve

3/4" Union

3/4" Ball  Valve

Boiler Drain Valve

Solenoid Valve

S

Pressure Regulator

Circulating Pump

Mixing Valve