Danfoss ECL Comfort 210 Installation Manual

Also see for ECL Comfort 210: Installation guide User guide Installation guide Installation guide Operating guide

Danfoss ECL Comfort 210 Installation Manual Manual pdf 71 page image

Installation Guide ECL Comfort 210 / 310, application A237 / A3375.3 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.ReturntemperaturelimitationHighlimitY2LowlimitY1° C1540-1560° COutdoortemp.Low T out X2 HighToutX1Influence‘Infl. - min.’ > 0‘Limit’‘Infl. - max.’ > 0Returntemperature‘Infl. - max.’ < 0‘Infl. - min.’ < 0If the ‘Infl.’ factor is too high and / or the ‘Adapt. time’ too low, there isa risk of unstable control.MENU > Settings > Return limitHigh T out X1 (return temp. limitation, high limit, X-axis) 11031Circuit Setting range Factory setting1 -60 ... 20 °C 15 °CSettheoutdoortemperatureforthelowreturntemperaturelimitation.The corresponding Y coordinate is set in 'Low limit Y1'.MENU > Settings > Return limitLow limit Y1 (return temp. limitation, low limit, Y-axis) 11032Circuit Setting range Factory setting1 10 ... 150 °C 40 °CSetthereturntemperaturelimitationreferringtotheoutdoortemperatureset in 'High T out X1'.The corresponding X coordinate is set in 'High T out X1'.Danfoss District Energy VI.LG.R1.02 DEN-SMT/DK 71