Cascade Function - Rinnai EHP-HS190M-IN2 User's And Installer's Manual

15. CASCADE FUNCTION

Cascade operation allows up to 6 units to be connected in parallel, thereby ensuring that the system is
fully reliable and efficient.
The Master unit controls and displays the parameters of the entire system on its User Interface, activating
the Slave units when its capacity is not enough to fulfil the system load.
IDU0 Master (Internal unit)
IDU1.. Slave (max 5 internal unit)
ODU0.. External unit
HMI
Controller
SV1 3-way valve (indoor unit)
T5 Temperature probe
DWH DHW storage tank
TBH
Heating heater
Balance tank Balance tank
Tbt
Balancing tank temperature probe
pumpo Zone 1 pump
SV3 Zone 2 mixing valve (low temperature)
pumpc Zone 2 pump
Tw2 Zone 2 temperature probe
Zone1 Fan coil
Zone2
Underfloor heating
caScade function
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