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Recirculati n Modes
Rinnai Circ-Logic™ o ers homeowners enhanced
convenience and energy e ciency in home hot water
recircula on systems with a dedicated return line or
cross over return using the included thermal bypass
valve.
Circ-Logic™ has been designed to provide
homeowners with the ability to customize their
recircula on systems based on such key variables as
length of recircula on loop, piping insula on, and the
homeowner's comfort and effici cy preferences.
Sequence of Opera on
DIP switches (SW 4, 7, & 8 in DIPSW 2) should be set
correctly for recircula on mode. The Rinnai water
heater should be turned on.
Pump recircula on begins when the water heater is
turned on. The Rinnai inlet and/or outlet thermistors
measure the water temperature.
The cycle will restart at the approximate ti e
intervals based on the applicati n (Cross over or
Dedicated mode, set temperature, and preset mode
ie. Comfort or Economy)
NOTE
Rinnai strongly recommends installing insulati n to
the hot water and dedicated return lines to decrease
the amount of heat loss .
Dedicated Mode
Dedicated mode requires that a dedicated line be
installed in the applicati n; Refer to Installa on of
Plumbing secti n (Dedicated Mode Plumbing Diagram)
Dedicated Return Line:
Dedicated return line will run from point of use
located farthest away from tankless water heater.
Less energy is consumed due to fewer pump
cycles
When the return water temperature reaches
approximately 12.6°F (7°C) below the selected
temperature setti , the water heater and pump
will turn off
Maximum Pipe Length*
(Hot Water Supply Line and Dedicated Return Line)
Pipe Diameter
Total
(*Take equivalent elbow lengths into considera on
when calcula ng pipe length.)
42
Dip Switch setti s for Dedicated Mode (DIPSW 2)
Dedicated Mode Pump Intervals
3/4"
1/2"
* Once the pump OFF interval has elapsed (see above
400
100
chart), the pump will cycle ON. The pump ON interval will
vary based on temperature se
es mated heat loss in the system.
KBP Series Manual
SW 4 in
Opera on
DIPSW 2
Pump o
OFF
Dedicated Return
OFF
Economy Mode
Dedicated Return
OFF
Comfort Mode
Rinnai
Temperature Se ng
°F
140
135
130
125
120
115
110
108
106
104
102
100
98
SW 7 in
SW 8 in
DIPSW 2
DIPSW 2
OFF
OFF
ON
OFF
ON
ON
Pump OFF Intervals*
(minutes)
Economy
Comfort
18
9
20
10
22
11
24
12
28
14
32
16
38
19
40
20
44
22
48
24
52
26
56
28
62
31
g, insulatio , and
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