Multiple Boiler Cascade Installation And Start-Up; Boiler Cascade: Set Boiler Address; Boiler Cascade: Set Power Switch S1 - Riello Array AR 2000 Installation And Operation Manual

5.6 Multiple Boiler 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 of managing
up to 8 boilers as a single, coordinated heating system. The logical schematic is:
BMS
Modbus
RS485
Fig. 56 Cascade installation scheme
After connecting 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 performed.

5.7 Boiler Cascade: Set Boiler Address

Assign the Boiler Address in the managing control of each boiler in
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. 2
Dependent 2 Dep. 3
Dependent 3 Dep. 4
Touch Screen 900PB
Power Supply
Touch Screen 900PB
Power Supply
(73) Boiler
BOILER
Address
Dependent 4 Dep. 5
Dependent 5 Dep. 6
Dependent 6 Dep. 7
Dependent 7 Dep. 8
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

5.7.1 Boiler 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
dependent boilers in the cascade.
Fig. 57 Set Power Switch S1
35
COMMISSIONING
System sensor D2 is
Cascade system sensor
J8 Iso + Power
S1 = on
S1 = off MANAGING
BOILER
S1 = off
J8 Iso
S1 = off
DEPENDENT
BOILER
S1 = off
S1 = off
Max. 8 boilers
S1
J8
J11
905MN