ECL Comfort 210/310, A275/A375 Installation Guide - Danfoss ...
ECL Comfort 210/310, A275/A375 Installation Guide - Danfoss ...
ECL Comfort 210/310, A275/A375 Installation Guide - Danfoss ...
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<strong>Installation</strong> <strong>Guide</strong> <strong>ECL</strong> <strong>Comfort</strong> <strong>210</strong> / <strong>310</strong>, application <strong>A275</strong> / <strong>A375</strong><br />
6.4 Return limit<br />
The return temperature limitation can be based on the outdoor<br />
temperature. The relationship between the return temperature<br />
limits and outdoor temperature is set in two coordinates.<br />
The outdoor temperature coordinates are set in 'High T out X1'<br />
and 'Low T out X2'. The return temperature coordinates are set in<br />
'High limit Y2' and 'Low limit Y1'.<br />
The controller automatically changes the desired boiler / flow<br />
temperature to obtain an acceptable return temperature when the<br />
return temperature falls below or gets higher than the calculated<br />
limit.<br />
This limitation is based on a PI regulation where P ('Infl.' factor)<br />
responds quickly to deviations and I ('Adapt. time') responds slower<br />
and over time removes the small offsets between the desired and<br />
actual values. This is done by changing the desired boiler / flow<br />
temperature.<br />
High T out X1 (return temp. limitation, high limit, X-axis) 12031<br />
Circuit Setting range Factory setting<br />
2 -60 ... 20 °C 15 °C<br />
Set the outdoor temperature for the low return temperature limitation.<br />
The corresponding Y coordinate is set in 'Low limit Y1'.<br />
Low limit Y1 (return temp. limitation, low limit, Y-axis) 12032<br />
Circuit Setting range Factory setting<br />
2 10 ... 150 °C 40 °C<br />
Set the return temperature limitation referring to the outdoor temperature<br />
set in 'High T out X1'.<br />
The corresponding X coordinate is set in 'High T out X1'.<br />
Low T out X2 (return temp. limitation, low limit, X-axis) 12033<br />
Circuit Setting range Factory setting<br />
2 -60 ... 20 °C -15 °C<br />
Set the outdoor temperature for the high return temperature limitation.<br />
The corresponding Y coordinate is set in 'High limit Y2'.<br />
High limit Y2<br />
Low limit Y1<br />
Influence<br />
Return temperature limitation<br />
° C<br />
60<br />
40<br />
-15<br />
15<br />
Low T out X2 High T out X1<br />
° C<br />
‘Infl. - min.’ > 0<br />
‘Limit’<br />
‘Infl. - max.’ > 0<br />
Return temperature<br />
‘Infl. - max.’ < 0<br />
‘Infl. - min.’ < 0<br />
Outdoor temp.<br />
If the ‘Infl.’ factor is too high and / or the ‘Adapt. time’ too low, there is<br />
a risk of unstable control.<br />
<strong>Danfoss</strong> District Energy VI.GU.L1.02 DEN-SMT/DK 129
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