American Water Heater ATI-705A-N Water Heater User Manual


 
24
TanklessTanklessTankless
Tankless
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-6-RGE
Domestic Hot Water - Circulation Systems
6 Tankless Water Heaters with Gas or Electric Tank
Preferred Piping Installation
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.
C
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W
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S
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ly
L
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Gas Supply
Tankless
Water
Heater
Primary
Water
Heater
Sub 1
Water
Heater
Sub 2
Water
Heater
Primary
Water
Heater
Sub 1
Water
Heater
Sub 2
Hot Water Supply Line
Smaller Return Line
Can Be Used After
The Last Fixture
Expansion Tank
(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
Pressure
Regulator Set to
5 PSI Below
Street Pressure
Building Outlets
For this application:
Pump should be controlled by
an Aquastat, Timer or Combina-
tion 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. Refer-
ence the section Pump Sizing
for Circulation.
Pump to be of bronze or
stainless construction.
Aquastat Connection
Tankless
Equipment List QTY
Tankless 6
Water Heaters
Electronic Connection *
* Refer to Tankless Accessories
and Model Applicability for
electronic connection details.
Tankless