Danfoss ECL Comfort 310 Operating Manual page 63

Operating Guide
Parameters indicated with an ID no. like "1x607" mean a universal
parameter.
x stands for circuit / parameter group.
MENU > Settings > Return limit
Limit (return temp. limitation)
Circuit
All
Set the return temperature value 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.'.
MENU > Settings > Return limit
Infl. - max. (return temp. limitation - max. influence)
Circuit
All
Determines how much the desired flow temperature will be influenced if the
return temperature is higher than the calculated limit.
* See Appendix "Parameter ID overview"
Influence higher than 0:
The desired flow temperature is increased, when the return
temperature gets higher than the calculated limit.
Influence lower than 0:
The desired flow temperature is decreased, when the return
temperature gets higher than the calculated limit.
MENU > Settings > Return limit
Infl. - min. (return temp. limitation - min. influence)
Circuit
All
Determines how much the desired flow temperature will be influenced if the
return temperature is lower than the calculated limit.
* See Appendix "Parameter ID overview"
Influence higher than 0:
The desired flow temperature is increased, when the return
temperature gets below the calculated limit.
Influence lower than 0:
The desired flow temperature is decreased, when the return
temperature gets below the calculated limit.
Danfoss District Energy
ECL Comfort 310, application P318
1x030
Setting range Factory setting
*
1x035
Setting range Factory setting
*
1x036
Setting range Factory setting
*
*
If the 'Infl. ' factor is too high and / or the 'Adapt. time' too low, there is
a risk of unstable control.
*
Example
The return limit is active above 50 °C.
The influence is set to -2.0.
The actual return temperature is 2 degrees too high.
Result:
The desired flow temperature is changed by -2.0 x 2 = -4.0 degrees.
Normally, this setting is lower than 0 in district heating systems to
avoid a too high return temperature.
Typically, this setting is 0 in boiler systems because a higher return
temperature is acceptable (see also 'Infl. - min.').
Example
The return limit is active below 50 °C.
The influence is set to -3.0.
The actual return temperature is 2 degrees too low.
Result:
*
The desired flow temperature is changed by -3.0 x 2 = -6.0 degrees.
Normally, this setting is 0 in district heating systems because a lower
return temperature is acceptable.
Typically, this setting is higher than 0 in boiler systems to avoid a too
low return temperature (see also 'Infl. - max.').
VI.JM.Q3.02
DEN-SMT/DK 63