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Programming Cascade Communication <br /> Parameter Settings (Cascade Communication) <br /> Refer to the parameter setting section of this manual for instructions on how to access and change <br /> parameter settings. <br /> Table 24 <br /> Setting # Setting Selection <br /> Description 8 8 C E F <br /> u8 Cascade Secondary Primary <br /> (2-23) <br /> uS Units in Standby <br /> (Cascade) 1 2 3 4 5 6 <br /> u8 Cascade: <br /> Primary: Select the water heater intended to be the Primary water heater for cascade communication. <br /> Set the parameter setting for this water heater to "Primary" (088). <br /> NOTE: Controller will display the set temperature for the system. <br /> Secondary: Factory Default setting for each water heater is set to "Secondary". Parameter adjustment is <br /> only needed on the water heater identified as "Primary". <br /> NOTE: Controller will display"---". <br /> 89 Units in Standby: <br /> Adjust the parameter setting of the primary unit to set the number of water heaters in standby. Standby <br /> units will maintain operation with the water flow control valve in the open position. The remaining water <br /> heaters will maintain the water flow control valve in the closed position. <br /> Setting Secondary ID <br /> After identifying the"Primary"water heater in <br /> the parameter settings, set the Secondary ID <br /> for all remaining water heater in the system by <br /> pressing the "On/Off" button on the controller. <br /> When ID setting is successful, the controller <br /> display will change from "---"to the newly set <br /> ID number. <br /> I'i0 —i7irc -02 -iJ3 <br /> W=tea V avon -r.n aeon anion <br /> Primary water Secondary 01 Secondary 02 Secondary 03 <br /> heater <br /> Figure 55 Identify Secondary ID by <br /> pressing "On/Off' <br /> Rinnai Tankless Water Heater Installation and Operation Manual 53 <br />