37
COMMISSIONING
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:
Demand: 0-10V / OpenTherm / On-Off
T outside
System sensor D2 is
Cascade system sensor
Boiler sensor
J6
J8
S1 = off
J8
S1 = off
90xMN - D1
Boiler manager &
Cascade manager
90xMN
- D2
90xMN
- D3
900PBTouch Screen
Max. 8 burners or units
Fig. 41
Module installation scheme
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