Rinnai Tankless Water Heater Installation and Operation Manual
52
Connecting Multiple Water Heaters (Cascade Communication)
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
Primary
Secondary 1
Secondary 2-23
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.
Cascade IN
Cascade OUT
Accessory Port
Location
Primary
PCB
Cascade
Jumper
OUT
Secondary 1
PCB
Secondary 2
PCB
IN
OUT
IN
Cascade
Jumper
Figure 52
Figure 51
Figure 53
Figure 54
