Danfoss ECL Comfort 310 Operating Manual

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5.4 Return limitThe return temperature limitation is based on the outdoortemperature. Typically in district heating systems a higher returntemperature is accepted at a decrease in outdoor temperature. Therelationship between the return temperature limits and outdoortemperature is set in two coordinates.The outdoor temperature coordinates are set in 'High T out X1'and 'Low T out X2'. The return temperature coordinates are set in'High limit Y2' and 'Low limit Y1'.The controller automatically changes the desired flow temperatureto obtain an acceptable return temperature when the returntemperature falls below or gets higher than the calculated limit.This limitation is based on a PI regulation where P ('Infl.' factor)responds quickly to deviations and I ('Adapt. time') respondsslower and over time removes the small offsets between thedesired and actual values. This is done by changing the desiredflow temperature.ReturntemperaturelimitationHighlimitY2LowlimitY1Outdoortemp.Low T out X2 HighToutX1The calculated limit is shown in brackets ( ) in the monitoring display.See the section "Monitoring temperatures and system components".MENU > Settings > Return limitDHW, ret. T limit 1x029When an addressed slave is active in DHW-tank heating / charging, thereturntemperaturelimitationinthemastercanbeset.Notes:• Themastercircuitmustbesettoreactonthedesiredflowtemperatureintheslave(s). See"Demandoffset"(ID11017).• Theslave(s)mustbesettosendits/theirdesiredflowtemperaturetothemaster. See "Send desired T" (ID 1x500).See Appendix “Parameter ID overview”OFF: No influence from slaves. The return temperaturelimitation is related to settings in "Return limit".10 –110 °C:Return temperature limitation value when slave is inDHW tank heating / charging operation.# 1 # = Master, example A266, address 15# 2 # = Slave, example A237, address 9# 3 # = Slave, example A367, address 6Some examples of applications with DHW-tank heating / charging are:• A217, A237, A247, A367, A377Sub-circuits are considered as slaves too.P330.1 . . . P330.5: Parameter 1x029 is present in circuit 1.P330.6 . . . P330.15: Parameter 1x029 is present in Master circuit (M).MENU > Settings > Return limitHigh T out X1 (return temp. limitation, high limit, X-axis) 1x031Settheoutdoortemperatureforthelowreturntemperaturelimitation.See Appendix “Parameter ID overview”The corresponding Y coordinate is set in 'Low limit Y1'.VI.GU.O3.02 © Danfoss | 2017.08 | 79Operating Guide ECL Comfort 310, application P330