For this application:

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

Pump to be sized to maintain circulation loop temperature.

A minimum of 3 GPM flow is recommended for the circulation system.

The pump should be sized to overcome the pressure loss through the Tankless water heater, optional storage tank, 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.

Tankless

 

Equipment List

QTY

Tankless

Tankless

1

Water Heater

Water Heater

 

 

 

G as S upply

20

Minimum 3/4 “ Hot

Water Supply Line

(Optional) 2-6 Gallon Storage Tank

(To eliminate cold water

Aquastat Connection

sandwich e ect caused by

 

 

 

 

 

 

 

 

 

 

 

fre quent On/O operation)

 

 

 

 

 

 

 

 

 

 

 

Minimum 3/4 “ Cold Water Supply Line

Expansion Tank

Building Outlets

Drawing Number:

WH-1-R

Drawing Date:

June 11, 2007

Domestic Hot Water - Circulation Systems

1 Tankless Water Heater

Optional Piping Installation

This is not an engineering drawing; it is intended only as a guide and not as a replacement for professional engineering project drawings. This drawing is not intended to describe a complete system. It is up to the

Key

contractor or engineer to determine the necessary components and configuration of the particular system to be installed. The drawing does not imply compliance with local building code requirements. It is the responsibility of the engineer or contractor to ensure that the installation is in accordance with all local building codes. Confer with local building officials before installation.

3/4" Ball Valve

3/4" Union

Check Valve

Pressure Relief Valve

Pressure Regulator

Circulating Pump

Boiler Drain Valve

SSolenoid Valve

Page 20
Image 20
American Water Heater GTS-505-PE, ATO-505-N, ATI-705-N, ATI-505-P, ATI-305-N, ATO-305-P, ATI-305-P, ATI-705A-P, ATI-705A-N WH-1-R

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