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Rinnai Circ-Logic™ (RCL)
With GTK15 Kit
© 2012 Rinnai America Corporation
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Features and Benefits
Rinnai Circ-Logic™ (RCL) offers homeowners enhanced convenience and energy
efficiency in homes with hot water recirculation systems with a dedicated return line.
The RCL controls the on/off sequence and operational cycles of the recirculation
pump through the programming of the tankless water heater’s control board. This
feature is standard on Rinnai’s Ultra and Luxury Series units.
The RCL has been designed to provide the homeowner with the ability to
customize their recirculation systems based on such key variables as home
size, length of recirculation loop, piping insulation, and the homeowner’s
comfort and efficiency preferences.
© 2012 Rinnai America Corporation
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Installation with GTK15 Kit
The GTK15 Kit, manufactured by Grundfos, allows the user
to enjoy further energy savings through the use of a timer.
© 2012 Rinnai America Corporation
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Installation with GTK15 Kit
© 2012 Rinnai America Corporation
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Installation with GTK15 Kit
• Pump must be installed in accordance with Rinnai installation
instructions when Circ-Logic™ is used.
• The contractor/engineer must determine the necessary components
for and configuration of the particular system being installed.
• It is the engineer’s or contractors responsibility to ensure the
installation is in accordance with all local building codes.
• The water heater and the plumbing system should be installed in
accordance with local codes and with Rinnai installation manual.
© 2012 Rinnai America Corporation
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Installation with GTK15 Kit
[1] The Equivalent pipe length includes supply piping, return
piping, and fittings. The installer/contractor/engineer must
calculate the total equivalent pipe length of the piping system.
© 2012 Rinnai America Corporation
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Installation with GTK15 Kit
WARNING:
Risk of electric shock. The
GTK15 Pump has two power
sources. Disconnect all supply
connections before servicing.
One is directly from the electrical
outlet for the timer and the other
is through the water heater for
the pump.
© 2012 Rinnai America Corporation
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Installation with GTK15 Kit
Timer Technical Application
The timer control is designed to turn the circulator on and off at preset times allowing the user to select
operation of the circulator during high use periods of the day.
Note that the timer will have a higher priority than the Rinnai Circ-Logic™. The pump will only
circulate water when both the timer and Circ-Logic™ output is activated.
Refer to Rinnai Circ-Logic™ Guide for instructions in setting and operating timer controls
© 2012 Rinnai America Corporation
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Sequence of Operation
Pump recirculation begins when the water heater is
turned on. The Rinnai inlet and outlet thermistors
measure the water temperature.
The water heater produces hot water at the
temperature setting. If the inlet thermistor detects
abnormal temperature then a diagnostic code 51 is
generated and the pump will turn off.
When the return water temperature reaches 15°F
(8.3°C) below the temperature setting the water
heater and pump will turn off.
The cycle will restart at the approximate time interval
in the table based on mode of operation and
temperature thermistor readings.
Note: The maximum Rinnai
temperature setting while in
recirculation mode is 140°F (60°C)
© 2012 Rinnai America Corporation
* The pump will cycle on at these calculated intervals which are based on
the temperature setting, insulation, timer settings and estimated heat loss
in the system. The values for your installation may vary.
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Rinnai Water Heaters that Incorporate Circ-Logic™
The table below indicates the beginning serial number for each model that has
the Circ-Logic™ feature.
For specific information on warranty with circulation, visit http://www.rinnai.us/warranty
© 2012 Rinnai America Corporation
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Troubleshooting
© 2012 Rinnai America Corporation
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The End
Rinnai Circ-Logic™ (RCL)
© 2012 Rinnai America Corporation
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