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305, 505, 705 Indoor Manual 21
Optional Piping for Circulation Systems
Pressure Relief Valve
3/4" Ball Valve
3/4" Union
Check Valve
S
Pressure Regulator
Circulating Pump
Solenoid Valve
Boiler Drain Valve
KEY
Minimum 3/4" Hot Water
Supply Line
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(Optional)
2-6 Gallon
Storage Tank
(To eliminate cold water
sandwich effect caused by
frequent On/Off operation)
Note:
Water heater outlet temperature
cannot be adjusted when
circulationpumpisrunning.
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Water Heater
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Minimum 3/4“ Cold Water Supply Line
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 water heate r,
supply and return plumbing.
Pump to be of bronze or stainless construc -
tion.
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.
Equipment List
Water Heaters
Kit (Optional)
(3/4" Fittings Include:
2 Unions, 2 Ball Valves,
2Drain Valves and
1 Pressure Relief Valve.)
QTY
1
1
Plumbing Installation
NOTE:
For residential and commercial
applications, 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.