Multiple Boiler Cascade Installation And Start-Up - Riello Array AR 399 SE Installation, Operation And Service Manual

4.6 Multiple Boiler Cascade Installation and Start-Up

Fig. 41 shows an example of Array boilers installed in a cascade of three units. The built-in control system is capable of managing up to
8 boilers as a single, coordinated heating system. The logical schematic is:
Touch Screen
Fig. 41 Module installation scheme
T outside
900PB
Power Supply
37
Demand: 0-10V / OpenTherm / On-Off
System sensor D2 is
Cascade system sensor
Boiler sensor
90xMN - D1
J6
Boiler manager &
Cascade manager
90xMN - D2
J8
S1 = off
90xMN - D3
J8
S1 = off
Max. 8 burners or units
COMMISSIONING