American Water Heater ATI-705-P Water Heater User Manual


 
23
Domestic Hot Water - Circulation Systems
3 Tankless Water Heaters with Gas or Electric Tank
Preferred Piping Installation
Tankless
Water Heater
Tankless
Water Heater
Drawing Number:
Drawing Date:
Pressure Relief Valve
3/4" Ball Valve
3/4" Union
Check Valve
Key
S
Pressure Regulator
Circulating Pump
Solenoid Valve
Boiler Drain Valve
WH-3-RGE
February 27, 2008
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
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.
Gas Supply
Tankless
Water Heater
Primary
Sub 1
C
o
ld
W
a
te
r
S
u
p
p
ly
L
in
e
Hot Water Supply Line
Smaller Return Line
Can Be Used After
The Last Fixture
Expansion Tank
Sub 2
(Optional) Header Sized One Pipe Size Larger Than Hot
Water Supply Line - (
To eliminate cold water sandwich effect
caused by frequent On/Off operation)
Gas or Electric
Tank Water
Heater
Tank Water Heater sized to
maintain circulation loop
temperature
Building Outlets
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.
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.
Aquastat Connection
Tankless
Equipment List QTY
Tankless 3
Water Heaters
Electronic Connection *
* Refer to Tankless Accessories
and Model Applicability for
electronic connection details.