Rinnai Tankless Water Heater Installation and Operation Manual
55
SETTING
#
SETTING DESCRIPTION
SELECTION
A
C
04
Recirculation Settings
No Recirculation
Recirculation
(Dedicated)
Recirculation
(Crossover)
05
Recirculation Mode
Economy
Comfort
Parameter Settings
Refer to the parameter setting section of this manual for instructions on how to access and change parameter
settings.
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
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).
Pump Status
Typical Intervals (minutes)
OFF
Economy
10
Comfort
4
Important:
In crossover mode, the internal pump in an
REP model runs based on time intervals only and not
water temperature.
Table 34
Table 36
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.)
