6. Protective Functions
The 'Protective functions‘ can be used by specialists to activate and set vari-
ous protective functions.
By no means does the controller replace the safety appliances on
site!
Seizing Protection
If the anti-seizing protection is activated, the controller switches the heat pump and the mixer on/off at 12:00 noon for 5 seconds to
prevent seizing of the pump/valve after long periods of inactivity.
Frost Protection
If the external temperature on sensor S1 goes below 1 °C and the heating circuit is turned off, the heating circuit will automatically
be turned on if the frost protection is activated and the reference flow temperature is set at the minimum flow temperature set
under see " Min. Flow " on page 18. As soon as the outdoor temperature exceeds 1 ° C, the heat circuit is switched off again.
Switching the frost protection function off or setting the minimum flow temperature too low can lead to severe damage
to the system.
Min. Flow
The minimum flow temperature is the lower limit of the heating curve, and by this, the reference flow temperature of the heating cir-
cuit. In addition to that, the minimal flow temperature is the reference flow temperature for the frost protection function.
Max. Flow
This value is the upper limit of the reference flow temperature of the heating circuit If however, the temperature of the heating cir-
cuit exceeds the set value, the heat circuit shuts down until the temperature falls below this value. The system purged for 55
seconds every 5 minutes.
The customer must provide an additional limiting thermostat which is connected to the pumps in series (eg underfloor
heating) for safety.
Discharge Protection
When activated, the heating circuit pump is switched off when the specified flow temperature is not reached, even though the mix-
ing valve is at least somewhat open. Every 5 minutes, the system checks if the flow temperature has been reached.
18