Installation Guide
Rinnai Tankless Water Heater Installation and Operation Manual 83
Parameter Settings
Refer to the parameter setting section of this manual for instructions on how to access and change
parameter settings.
Table 37: 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)
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.
Setting #
Setting
Description
Selection
A b C d
04
Recirculation Settings
No
Recirculation
Recirculation
(Dedicated)
Recirculation
(Crossover)
05
Recirculation Mode Economy Comfort Commercial
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.
*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.
Table 38
Table 36
Temperature Settings
Parameter
Setting 01A
°F 98 100 102 104 106 108 110 115 120† 125 130 135 140
°C 37 38 39 40 41 42 43 46 49 52 54 57 60
Parameter
Setting 01b
°F 110 115 120 125 130 135 140
145
**
150
**
155
**
160
**
165
**
170
**
175
**
180
**
185
**
°C 43 46 49 52 54 57 60 63 66 68 71 74 77 79 82 85
* These models have a default maximum temperature of 140°F (60°C) and an option to increase the
maximum temperature to 185°F (85°C) for CX models only. Refer to section “4.13 Configure
Parameter Settings” for further details.
† For Crossover Mode, minimum temperature setting is 120°F (49°C).
** Maximum set temperature with integrated pump is 140°F (60°C).