With the group operation mode parameter OPM-02, you can switch between sequential and parallel mode. The value 2, is the most energy efficient, since it keeps the last two heat generators warm.
ATTENTION:
The group operation mode shall never be changed while the heat generators are in operation. Otherwise the heat generator sequence will be seriously disturbed.
You should change this setting, you need a:
A controller warm-start would not help, since all the internal registers have to be reset
Table 9. Heat generators group operation mode
OPM-02 |
Heat generators group operation mode |
0; 1 |
sequential mode |
2 |
sequential mode, last two active boiler switch off in parallel mode |
3 |
parallel mode |