In the event of excessive heat in the primary heating system, it is possible to dissipate this heat into the secondary heating circuits. The primary heating system can generate a heat override signal that is connected via the communication signal overheat protection. In this case the water temperature setpoint will be increased with a percentageSYS-02 of the maximum mixed water temperature MWT-03. If the heat override signal returns to zero the water temperature setpoint will be ramped down to its "normal" setpoint during a time defined by the setting SYS-04.
During overheat protection the heat demand keeps its value and does not increase.
Fig. 26. Overheat protection
Table 27. Parameter List
Description |
Value Range |
Default Value |
Unit |
MWT-03: maximum mixed water temperature |
0…150 |
82 |
°C |
SYS-02: heat override raise percentage; 0 = disable |
0…2000 |
20 |
% |
SYS-04: MWT setpoint decrease time |
0…3600 |
600 |
sec |