Danfoss ECL Comfort 310 Operating Manual page 120

Operating Guide ECL Comfort 310, application P318
Why can't an application be selected when inserting the ECL
application key into the controller?
The actual application in the ECL Comfort controller must be
deleted before a new application (subtype) can be selected.
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.
What does the "i" in the upper right corner of the display
mean ?
When uploading an application (subtype) from the application
key into the ECL Comfort controller, the "i" in the upper right
corner indicates that - besides the factory settings - the subtype
also contains special user / systems settings.
Danfoss District Energy
120 DEN-SMT/DK VI.JM.Q3.02