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 on demand 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.On-Demand
Water Heater
Primary
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Water Heaters |
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Electronic Connection *
*Refer to
On-Demand
Water Heater
Sub 1
Minimum 3/4 “ Hot Water Supply Line
Gas Supply Line
Minimum 3/4 “ Cold Water Supply Line
(Optional)
Storage Tank
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fre quent On/O operation) |
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Building Outlets
Domestic Hot Water - Circulation Systems
2
Optional Piping Installation
Key
3/4" Ball Valve
3/4" Union
Check Valve
Pressure Relief Valve
Pressure Regulator
Circulating Pump
S
Boiler Drain Valve
Solenoid Valve | Mixing Valve |
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.
Drawing Date:
September 07, 2008
Drawing Number:
27
