52 KBD Series Manual
The Rinnai water heater has the ability to control a
recirculaon pump. Two modes are available,
Economy and Comfort, which recirculate the water in
the plumbing system to provide hot water more
quickly when a tap is opened.
Recirculaon mode is for residenal installaons only.
Recirculaon mode cannot be used with the Bath Fill
controller (BC-100V), an air handler, or with mulple
Rinnai water heaters.
The maximum Rinnai temperature seng while in
recirculaon mode is 140°F (60°C).
Voltage: 120V, 60 Hz
Amperage: less than 2 amps
NOTE: The Rinnai PC board will be damaged if
amperage exceeds 2 Amps.
In-rush current: Less than 2.5 Amps.
Check valve: An integral ow check (IFC) valve is
required. See plumbing diagram.
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 the recirculaon loop.
For more informaon on sizing the pump refer to the
Rinnai Circ-Logic™ Guide or the secon “Pump Sizing
for Circulaon” in the Rinnai Hot Water System
Design Manual.
1. Turn o the electrical power supply by unplugging
the power cord or by turning o the electricity at
the circuit breaker.
2. Install the recirculaon pump on the return line
according to the pump manufacturer installaon
instrucons. Install a check valve in the return
line as shown in the Plumbing Diagram if one is
not integrated into the pump.
3. The wire harness for the recirculaon pump is
bundled with the wire 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 4 Amp fuse to the hot wire (black) of the
pump. Connect the ground wire from the pump
to a screw at the base of the water cabinet .
Refer to the Pump Electrical Connecon Diagram.
Follow Electrical Code and pump manufacturers
recommendaons.
4. Adjust the dip switch by moving the SW4 in
DIPSW 2 to ON.
For Economy mode, set SW8 in DIPSW 2 to OFF
(default).
For Comfort mode, SW8 in DIPSW 2 to ON.
5. Connect power to the water heater. Press the
Power buon on the controller. The pump and
water heater will turn on to raise the recirculaon
loop temperature.
ON OFF
ON ON
Cut connector
and splice wires.
4 Amp
Fuse
BL
W
NOTE: DO NOT install scale control system within the
recirculaon loop.
Cut wire to
connect pump
PC
Board
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