Recirculation Modes - Rinnai SENSEI RX199i Installation And Operation Manual

Parameter Settings
Refer to the parameter setting section of this manual for instructions on how to access and change
parameter settings.
Table 36
Setting
Setting # Description
04
Recirculation Settings
05 Recirculation Mode
04 Recirculation Settings
Dedicate 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
*Take equivalent elbow lengths and all fittings into consideration when calculating pipe length.
Note: If your recirculation loop length exceeds the length listed in the above table, the recirculation
loop may not be heated up properly.
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.
Table 38
140 135
Economy 18 20
Comfort 9 10
Rinnai Tankless Water Heater Installation and Operation Manual
A
No
Recirculation
Economy
Table 37: Maximum Pipe Length*
3/4 in.
400 ft. (122 m)
Rinnai Set Temperature
130 125 120
Typical Pump OFF Intervals (Minutes)
22 24 28
11 12 14
Selection
b
Recirculation Recirculation
(Dedicated) (Crossover)
Commercial
Comfort
Setting
1/2 in.
100 ft. (30 m)
115 110 108 106
32 38 40 44
16 19 20 22
C d
104 102 100
48 52 56
24 26 28
81
98
62
31