Key functions Flow temperature control
• Returntemperaturelimitation
The controller automatically changes the
desiredowtemperaturetoobtainan
acceptable return temperature when the
return temperature falls below or gets higher
than the set value. The return temperature
inuencecanbelimitedbythemin./max.
owlimitation.
Optimization
• Autotuning
A function for automatically setting the
proportional band (Xp) and integration time
constant (Tn).
Safety functions
• Frostprotection
The controller automatically switches
thecirculationpumpONwhentheow
temperature is lower than a user-defined
value (factory setting: 10 °C).
• Motorprotection
The controller prevents unstable temperature
control thus resulting in a longer life of the
actuator.
• Pumpexercise
Exercise of the pump to avoid blocking in
periods without heat demand.
Heating
(Application 130)
Application 130 examples
District heating circuit with heat exchanger
Boiler-based heating circuit