Installation Guide

Rinnai Tankless Water Heater Installation and Operation Manual 47
Connecting Multiple Water Heaters (Cascade Communication)
Figure 42
With use of cascade cable(s) up to 24 water heaters can be electronically connected. This
connection will rotate water heater operation order to ensure equal usage among the entire system
and enables all water heaters connected to modulate operation and function as one hot water
source.
NOTE: For proper operation, do not combine different models with cascade communication.
Cascade Cable Required:
• Cable Length: 26 ft.
(8 m) OR
• Cable Length: 10 ft.
(3 m)
• One cable required
for each water heater.
• Includes 1 cable and
2 cascade jumpers.
Cascade Cable Assembly
1. Connect one end of the Cascade Cable
to the “Cascade OUT” accessory port
on the PCB.
2. Connect the other end of the cascade
cable to the “Cascade IN” accessory
port on the PCB of the next water
heater.
3. Repeat steps 1 and 2 for each
subsequent water heater in the system.
4. Connect the “Cascade
Jumper” (Included with the cascade
cable) to the open accessory ports.
5. Proceed to “Programing Cascade
Communication” on the following page.
Figure 41
Figure 43
Figure 44