78
Rinnai Tankless Water Heater 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.
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.
Pump Status
Typical Intervals
OFF
Economy
10
Comfort
4
Commercial
4
Important:
The internal pump
in an RSC model runs based on
time intervals only and not water
temperature (like dedicated return
line recirculation systems)
Table 34
Table 36
SETTING
#
SETTING DESCRIPTION
SELECTION
A
C
04
Recirculation Settings
No Recirculation
Recirculation
(Dedicated)
Recirculation
(Crossover)
05
Recirculation Mode
Economy
Comfort
04
Recirculation Settings
Crossover Mode:
Adjust parameter setting to 04c for crossover 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 35
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 and all fittings
into consideration when
calculating pipe length.)
