Installation Guide

KBD Series Manual 51

The Rinnai water heater has the ability to control a
recirculaon 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.
Recirculaon mode is for residenal installaons only.
Recirculaon mode cannot be used with the Bath Fill
controller (BC-100V), an air handler, or with mulple
Rinnai water heaters.
The maximum Rinnai temperature seng while in
recirculaon 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 recirculaon loop.
For more informaon on sizing the pump refer to the
Rinnai Circ-Logic™ Guide or the secon “Pump Sizing
for Circulaon” 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 recirculaon pump on the return line
according to the pump manufacturer installaon
instrucons. 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 recirculaon 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 Connecon Diagram.
Follow Electrical Code and pump manufacturers
recommendaons.
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 buon on the controller. The pump and
water heater will turn on to raise the recirculaon
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
recirculaon loop.


Cut wire to
connect pump
PC
Board