Heat generator stages have minimum on-, off times and blocking times for the next stages.
Fig. 11. Blocking times for a staged heat generator
1; 0 = no blocking;
2 = blocking increasing number of stages (boiler stages are allowed to switch on);
3 = blocking decreasing number of stages (boiler stages are allowed to switch off);
4 = blocking increasing and decreasing number of stages (boiler stages are not allowed to switch on / off).
Fig. 12. Blocking times for a modulating heat generator
The strategy provides an output “DispBlockSignal” where this signal can be viewed and trended.
To build the blocking signal the strategy uses an internal communication signal.