Return Limit - Danfoss ECL Comfort 310 Operating Manual

Operating Guide

5.4 Return limit

DHW circuit
The return temperature limitation is based on a constant
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.
Danfoss District Energy
ECL Comfort 310, application P318
= Return temperature
X
= Limitation temperature
# 1 #
= Negative influence (1x035) when return temp. gets higher than
# 2 #
limit. temp.
= Negative influence (1x036) when return temp. gets lower than
# 3 #
limit. temp.
= Positive influence (1x036) when return temp. gets lower than limit.
# 4 #
temp.
= Positive influence (1x035) when return temp. gets higher than
# 5 #
limit. temp.
If the 'Infl. ' factor is too high and / or the 'Adapt. time' too low, there is
a risk of unstable control.
When the anti-bacteria process is active, the return temperature
limitation is disabled.
VI.JM.Q3.02
DEN-SMT/DK 61