Pump Status/ Alarm Override

In case of a secondary pump failure, the heat exchanger could easily overheat and trigger a maximum temperature or safety temperature thermostat alarm.

To avoid this, do the following connection:

If this alarm is active the heat exchanger will reduce its heat demand to the minimum value of the defined in the parameter
DST-03 and the actual heat demand at the input “HeatDemand” limited by SST-02.

See the connection examples in the next figure.

Fig. 10.   Connect the pump status or alarm to the heat exchanger macro


Table 15.   Parameter List

Description

Value Range

Default Value

Unit

DST-03: minimum district supply temperature at pump alarm

0...200

0

°C