Overheat Protection of Heat Generators

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