Transcript Recirculation Pump Logic

Rinnai Circ-Logic (RCL)
© 2012 Rinnai America Corporation
Features and Benefits
Rinnai Circ-Logic (RCL) offers homeowners enhanced convenience and energy
efficiency in home 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
Pump Requirements
1. Turn off the electrical supply by unplugging the
power cord or by turning off electrical power at
breaker.
Voltage: 120, 60 HZ
Amperage: less than 2 amps
NOTE: The Rinnai PC board will be damaged if
amperage exceeds 2 Amps.
Check valve: An integral flow check (IFC) valve is
required. See plumbing diagram.
2. Install the recirculation pump on the return line
according manufacturer installation instructions.
Install a check valve in the return line as shown in
the Plumbing Diagram if one is not integrated in the
pump.
The pump should be sized for 2.5 GPM at
the pressure loss through the tankless
water heater and the supply and return
plumbing in recirculation loop.
For more information on sizing the pump
refer to “Pump Sizing for Circulation” in
the Rinnai Hot Water System Design
Manual.
Note: Recirculation mode is for
residential installations only, and cannot
be used with the Bath Fill controller (BC100V), an air handler, or with multiple
Rinnai water heaters.
© 2012 Rinnai America Corporation
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Installation
3. The wiring harness for the recirculation
pump is bundled with the wiring harness from
the PC board. The connector has a black and
white wire with the Label “Cut wire to connect
to pump”. To connect to the pump, cut the
connector, splice the wires and add a 4 Amp
fuse to hot wire (black) to the pump. Connect
the ground wire from the pump to a screw at
base of water heater cabinet.
( Refer to the pump Electrical Connection
Diagram. Follow Electrical Code and pump
manufactures recommendations.)
4. Adjust the (SW2) (bank of white) dip switches
as follows:
Economy mode, Switch 4 ON Switch 8 OFF
Comfort mode, Switch 4 ON Switch 8 ON.
5. Connect power to the water heater. Press
the power button on the controller. The pump
and water heater will turn on to raise the
recirculation loop temperature.
© 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)
* The pump will cycle on at these calculated intervals which are based on
the temperature setting, insulation, and estimated heat loss in the system.
The values for your installation may vary.
© 2012 Rinnai America Corporation
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The End
Rinnai Circ-Logic (RCL)
© 2012 Rinnai America Corporation
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