Danfoss ECL Comfort 210 Installation Manual page 170

Installation Guide ECL Comfort 210 / 310, application A275 / A375
How to react on alarms?
An alarm indicates that the system is not operating satisfactorily.
Please contact your installer.
What does P and PI control mean?
P control: Proportional control.
By using a P control, the controller will change the flow
temperature proportional to the difference between a desired
and an actual temperature, e.g. a room temperature.
A P control will always have an offset which not will disappear
over time.
PI control: Proportional and Integrating control.
A PI control does the same as a P control, but the offset will
disappear over time.
A long 'Tn' will give a slow but stable control, and a short 'Tn' will
result in a fast control but with a higher risk of unstability.
Danfoss District Energy
170 DEN-SMT/DK VI.GU.L1.02