Installation Guide
ECL Comfort 210 / 310, application A214 / A314
5.4 Return limit
Parameters indicated with an ID no. like "1x607" mean a universal
parameter.
x stands for circuit / parameter group.
The return temperature limitation is based on a selectable
temperature value. The controller automatically changes the
desired flow / duct temperature to obtain an acceptable return
temperature when the return temperature falls below or gets
higher than the set limit.
This limitation is based on a PI regulation where P ('Infl.' factor)
responds quickly to deviations and I ('Adapt. time') responds slower
and over time removes the small offsets between the desired and
actual values. This is done by changing the desired flow / duct
temperature.
Typical for heating systems is that the return temperature must be
as low as possible.
Typical for cooling systems is that the return temperature must be
as high as possible.
Desired flow / duct temperature
°
C
° C
Return temp.
Limit
Influence
‘Infl. - min.’ > 0
‘Limit’
‘Infl. - max.’ > 0
Return temperature
‘Infl. - max.’ < 0
‘Infl. - min.’ < 0
If the ‘Infl.’ factor is too high and / or the ‘Adapt. time’ too low, there is
a risk of unstable control.
MENU > Settings > Return limit
Limit (return temp. limitation)
1x030
Circuit
Setting range
Factory setting
All
*
*
Set the return temperature you accept for the system.
* See Appendix “Parameter ID overview”
When the return temperature falls below or gets higher than the
set value, the controller automatically changes the desired flow /
duct temperature to obtain an acceptable return temperature. The
influence is set in 'Infl. - max.' and 'Infl. - min.'.
Danfoss District Energy
VI.GU.A2.02
DEN-SMT/DK
121
