Installation Guide

48 Rinnai Tankless Water Heater Installation and Operation Manual
08 Cascade:
Primary: Select the water heater intended to be the Primary water heater for cascade communication. Set
the parameter setting for this water heater to “Primary” (08b).
NOTE: Controller will display the set temperature for the system.
Secondary: Factory Default setting for each water heater is set to “Secondary”. Parameter adjustment is
only needed on the water heater identified as “Primary”.
NOTE: Controller will display “- - -”.
09 Units in Standby:
Adjust the parameter setting of the primary unit to set the number of water heaters in standby. Standby
units will maintain operation with the water flow control valve in the open position. The remaining water
heaters will maintain the water flow control valve in the closed position.
Programming Cascade Communication
Setting #
Selection
Setting
Description
A
b
C
d
E F
08
Cascade
Secondary
(2-24)
Primary
09
Units in Standby
(Cascade)
1 2 3 4 5 6
Table 22
Figure 45
Refer to the parameter setting section of this manual for instructions on how to access and change
parameter settings.
Setting Secondary ID
After identifying the “Primary” water
heater in the parameter settings, set
the Secondary ID for all remaining
water heater in the system by press-
ing the “On/Off” button on the con-
troller.
When ID setting is successful, the
controller display will change from “-
- -” to the newly set ID number.