American Water Heater GT-705-PI, ATO-505-N, ATI-705-N, ATI-505-P, ATI-305-N, ATO-305-P manual WH-2-R

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For this application:					Tankless
					Equipment List	QTY
Pump should be controlled by an Aquastat,		Tankless		Tankless	Tankless	2
Timer or Combination Aquastat and Timer.	Water Heater		Water Heater		Water Heaters
Pump to be sized to maintain circulation					Electronic Connection *
loop temperature.		Primary		Sub 1	* Refer to Tankless Accessories
A minimum of 3 GPM flow is recommended
					and Model Applicability for
for the circulation system.
					electronic connection details.

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.

	Gas Supply Line
Minimum 3/4 “ Hot
Water Supply Line
(Optional)	Minimum 3/4 “ Cold
	Water Supply Line
2-10 Gallon
Storage Tank

(To eliminate cold water	Aquastat Connection
sandwich e ect caused by		Expansion Tank
fre quent On/O operation)

Building Outlets

Drawing Number:

WH-2-R

Drawing Date:

February 27, 2008

Domestic Hot Water - Circulation Systems

2 Tankless Water Heaters

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