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Manual - Rinnai Condensing Water Heaters 25
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
circulation pump is running.
QTY
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Rinnai
Equipment List
Rinnai
Water Heaters
RIK-KIT (Optional)
(3/4" Fittings Include:
2 Unions, 2 Ball Valves,
2Drain Valvesand
1 Pressure Relief Valve.)
3
/
4
"
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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 Rinnai water
heater, supply and return plumbing. Refer -
ence the Rinnai Hot Water System Design
Manual, Pump Sizing for Circulation.
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.
Condensate drain line
Condensate
drain
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.