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