Return Limit - Danfoss ECL Comfort 210 Installation Manual

Installation Guide

6.3 Return limit

Application A230.2:
The return temperature limitation is based on a selectable
temperature value. The controller automatically changes
the desired flow 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 temperature.
Typical for cooling systems is that the return temperature must be
as high as possible.
Limit (return temp. limitation)
Circuit
1
Set the return tempeature you accept for the system.
When the return temperature falls below or gets higher than the
set value, the controller automatically changes the desired flow
temperature to obtain an acceptable return temperature. The
influence is set in 'Infl. - max.' and 'Infl. - min.'.
Adapt. time (adaptation time)
Circuit
1
Controls how fast the return temperature adapts to the desired return
temperature limit (I control).
OFF:
The control function is not influenced by the 'Adapt.
time' .
1:
The desired temperature is adapted quickly.
50:
The desired temperature is adapted slowly.
74 DEN-SMT/DK
ECL Comfort 210, application A230
11030
Setting range Factory setting
–20 ... 80 °C 20 °C
11037
Setting range Factory setting
OFF / 1 ... 50 s OFF
Desired flow temperature
Influence
If the 'Infl. ' factor is too high and / or the 'Adapt. time' too low, there is
a risk of unstable control.
The adaptation function can correct the desired flow temperature
with max. 8 K.
VI.LG.H1.02
Return temp.
Limit
'Infl. - min.' > 0
'Limit'
'Infl. - max.' > 0
Return temperature
'Infl. - max.' < 0
'Infl. - min.' < 0
Danfoss District Energy