80
Rinnai Tankless Water Heater Installation and Operation Manual
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).
Commercial:
Adjust parameter setting to 05C for Commercial mode. This mode cycles the pump on
and off continuously, which may result in excessive machine wear and energy consumption.
Rinnai Set Temperature
140
135
130
125
120
115
110
108
106
104
102
100
98
Typical Pump OFF Intervals (Minutes)
Economy
18
20
22
24
28
32
38
40
44
48
52
56
62
Comfort
9
10
11
12
14
16
19
20
22
24
26
28
31
Table 39
Table 37
SETTING
#
SETTING DESCRIPTION
SELECTION
A
C
04
Recirculation Settings
No Recirculation
Recirculation
(Dedicated)
Recirculation
(Crossover)
05
Recirculation Mode
Economy
Comfort
