Recircula On Mode - Rinnai RL75i REU-VC2528FFUD-US Installation And Operation Manual

Recircula on Mode

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).
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 flow 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 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.
Installa on
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 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.
Economy Mode
Comfort Mode
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.
HOT WATER
SUPPLY LINE
(minimum 3/4")
RECIRCULATION
LOOP
HOT WATER OUTLETS
NOTE: DO NOT install the Rinnai Scale Control system
within the recircula on loop.
PUMP
VC Series Manual
Se ngs for SW2
(bank of white switches)
Switch 4
ON
ON
COLD WATER SUPPLY LINE
ELECTRICAL
THERMAL
CONNECTION
EXPANSION TANK
(POWER)
CHECK VALVE
(REQUIRED)
PUMP
RETURN LINE
(minimum 3/4")
Plumbing Diagram
Cut connector
and splice wires.
4 Amp
Fuse
BL
W
Pump Electrical Connec on
Switch 8
OFF
ON
CHECK
VALVE
RINNAI
SCALE
CONTROL
(RECOMMENDED)
PC
Board
29