Rinnai REU-VA3237FFU - Manual (Page 25)

VA Series Indoor LS Manual 25
Optional Piping for Circulation Systems
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
for and configuration of the particular system being installed. The
drawing does not imply compliance with local building code
requirements. It is the engineer/contractor responsiblity to ensure
the installation is in accordance with all local building codes. Confer
with local building officials before installation.
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
Building Fixture Outlets
(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
1
1
Expansion Tank
Rinnai
Water Heater
Rinnai
Equipment List
Rinnai
Water Heaters
RIK-KIT (Optional)
(3/4" Fittings Include:
2 Unions, 2 Ball Valves,
2 Drain Valves and
1 Pressure Relief Valve.)
3/4" Gas Connection
Gas Supply
PLEASE NOTE THIS PIPING
ARRANGEMENT REDUCES
RESIDENTIAL AND COMMERCIAL
WARRANTY TO THE FOLLOWING:
3 Years On Heat Exchanger
3 Years On Parts
(Full warranty will be maintained if an
on-demand recirculation
system is incorporated.
Refer to the Limited Warranty.)
Minimum 3/4"ColdWater 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.