Rinnai REU-VEP2730FFD-US Installation And Operation Manual page 55

Parameter Settings
Refer to the parameter setting section of this manual for instructions on how to access and change parameter
settings.
Table 34
SETTING
SETTING DESCRIPTION
#
Recirculation Settings
04
Recirculation Mode
05
Recirculation Settings
04
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
(Maximum pipe length includes the hot water supply line and dedicated return line.)
Pipe Diameter
Total
Recirculation Modes
05
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 36
Pump Status
Economy
Comfort
Rinnai Tankless Water Heater Installation and Operation Manual
No Recirculation
Table 38: Maximum Pipe Length*
3/4 in.
400 ft. (122 m)
Typical Intervals (minutes)
10
4
A
Recirculation
(Dedicated)
Economy Comfort
1/2 in.
100 ft. (30 m)
Important: In crossover mode, the internal pump in an
REP model runs based on time intervals only and not
water temperature.
SELECTION
C
Recirculation
(Crossover)
(*Take equivalent elbow
lengths and all fittings
into consideration when
calculating pipe length.)
55