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Figure 6: Optional Piping for Circulation Systems
NOTE:
Applications, using this piping
arrangement reduces the
warranty to the following:
3 years on heat exchanger
3 year on parts
Full warranty will be maintained if an
on-demand recirculation system in
incorporated. Refer to the Limited
Warranty.
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 T
pressure loss through the water heater,
supply and return plumbing.
Pump to be of bronze or stainless construc-
tion.
Note: Water heater outlet temperature
cannot be adjusted when
circulation pump is running.
Minimum 3/4" Hot Water
Supply Line
0
o o
Water Heater
o o
(Optional)
2-6 Gallon
Storage Tank
(To eliminate cold water
sandwich effect caused by
frequent On/Off operation)
Building Fixture Outlets _ ;
Equipment List QTY
Water Heaters 1
Plumbing Installation 1
Kit (Optional)
(314" Fittings Include:
2 Unions, 2 Ball Valves,
2 Drain Valves and
I Pressure Relief Valve.)
3/4" Gas Connection
Gas Supply
Minimum 3/4" ColdWaterSupply Une
Expansion Tank
I & 3/4" Ball Valve
-- 3/4" Union
Check Valve
Z_ Pressure Relief Valve
KEY
_ Pressure Regulator
Circulating Pump
Boiler Drain Valve
[_ Solenoid Valve
This is not an engineered drawing, It is intended only as a guide and not
as a replacement for professionally engineered project drawings. This
drawing is not intended to describe a complete system. It is up to the
contractor/engineer to determine the necessary components and
configuration of the particular system being installed. This drawing does
not imply compliance with local building code requirements. It is the
responsibility of the contractor/engineer to ensure installation is in
accordance with all local building codes. Confer with local building
officials before installation.
305 & 505 Indoor Manual 17