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Parameter Settings
Refer to the parameter settings section of this manual for instructions on how to access and change
parameter settings.
Table 37
SETTING
SETTING DESCRIPTION
#
Recirculation Settings
04
Recirculation Mode
05
Recirculation Settings
04
Dedicated Mode: Adjust parameter setting to 04b for dedicated recirculation applications. Maximum
recirculation loop length of 400 ft (122m) with 3/4 in. pipe or 100 ft (30m) with 1/2 in. pipe
(Maximum pipe length includes the hot water supply line and dedicated return line.)
Pipe Diameter
Total
Recirculation Modes
05
Economy (Factory Default): Adjust parameter setting to 05A for Economy mode. This mode cycles the
pump less often, using less energy to maintain the circulation loop temperature.
Comfort: Adjust parameter setting to 05b for Comfort mode. This mode cycles the pump more frequently,
ensuring the loop temperature remains higher (but also uses more energy).
Table 39
120
Typical Pump OFF Intervals (Minutes)
Economy
28
Comfort
14
Rinnai Tankless Water Heater Installation and Operation Manual
No Recirculation
Table 38: Maximum Pipe Length*
3/4 in.
400 ft. (122 m)
Rinnai Set Temperature (°F)
125
130
24
22
12
11
A
Recirculation
(Dedicated)
Economy
Comfort
1/2 in.
100 ft. (30 m)
135
140
20
18
10
9
SELECTION
C
Recirculation
(Crossover)
(*Take equivalent elbow
lengths into consideration
when calculating pipe
length.)
Important: In dedicated mode, the
internal pump in an REP model
activates on time interval selected and
deactivates based on return water
temperature.
57
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