Boilers' Cascade Installation And Start-Up; Boilers Cascade: Set Boiler Address; Boilers Cascade: Set Power Switch S1 - Riello Array AR 3000 Installation And Operation Manual

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3.6 Boilers' cascade installation and start-up

Appendix L shows an example of Array boilers installed in a cascade of three units. The built-in control system is capable to manage up
to 8 boilers as a single, coordinated heating system. The logical scheme is:
RS485
RS232
RS485
RS232
BMS bus
Fig. 42 Cascade installation scheme
After the electrical wiring of the Managing controllers of each boiler of the cascade (through the "Cascade link" connections on the Low
voltage terminal strips), the following steps must be done:

3.6.1 Boilers Cascade: Set Boiler Address

Assign the Boiler Address in the Managing boards of each boiler of
the cascade, following the path below on the Sevice display:
Menu->Setting->Boiler Settings->Boiler Cascade Settings->(73)
Boiler Address
(73) Boiler
BOILER
Address
Managing Managing
Dependent 1 Dep. 1
Dependent 2 Dep. 2
Dependent 3 Dep. 3
Touch Screen 900PB
Power Supply
900PB
Touch Screen
Power Supply
(73) Boiler
BOILER
Address
Dependent 4 Dep. 4
Dependent 5 Dep. 5
Dependent 6 Dep. 6
Dependent 7 Dep. 7
Demand: 0-10V / OpenTherm / On-Off
T outside
Boiler sensor
90xMN - D1
J6
Boiler manager &
Cascade manager
90xMN - D2
J8
90xMN - D3
J8
Max. 8 burners or units
Boiler sensor
90xMN - D1
J6
Boiler manager &
Cascade manager
90xMN - D2
J8
90xMN - D3
J8
Max. 8 burners or units

3.6.2 Boilers Cascade: Set Power switch S1

On the Managing controller of the Cascade Managing boiler, the
Power Switch S1 must be in ON position (see picture below).
The S1 switch must be in OFF position on all other controllers of the
boilers in the cascade.
Fig. 43 Set Power switch S1
24
System sensor D2 is
Cascade system sensor
J8 Iso + Power
S1 = on
MANAGING
S1 = off
BOILER
S1 = off
J8 Iso
S1 = off
DEPENDENT
BOILER
S1 = off
S1 = off
Max. 8 boilers
S1
J8
J11
905MN