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VC Series Manual 29
Recirculaon Mode
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).
Pump Requirements
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.
Pump Size
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.
Installaon
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 4th switch in
the whie set of switches (SW2) to ON.
For Economy mode, set the 8th switch in the
white set of switches (SW2) to OFF (default).
For Comfort mode, set the 8th switch in the white
set of switches (SW2) 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.
Sengs for SW2
(bank of white switches)
Switch 4 Switch 8
Economy Mode ON OFF
Comfort Mode ON ON
Plumbing Diagram
NOTE: DO NOT install the Rinnai Scale Control system
within the recirculaon loop.
PUMP
C
ut wi
r
e
t
o
c
onne
c
t
t
o pump
Cut connector
and splice wires.
Pump Electrical Connecon
4 Amp
Fuse
BL
W
PC
Board
SCALE CONTROL
(RECOMMENDED)
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