ECL Comfort 210/310, A217/A317 Installation Guide - Danfoss ...
ECL Comfort 210/310, A217/A317 Installation Guide - Danfoss ...
ECL Comfort 210/310, A217/A317 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>A217</strong> / <strong>A317</strong><br />
If you want to tune the PI regulation precisely, you can use the following method:<br />
• Set the ‘Tn’ (integration time constant) to its max. value (999 sec.).<br />
• Decrease the value for the ‘Xp’ (proportional band) until the system starts hunting (i.e. gets unstable) with a constant amplitude (it<br />
might be necessary to force the system by setting an extreme low value).<br />
• Find the critical time period on the temperature recorder or use a stop watch.<br />
Temp. Critical time period<br />
Time<br />
This critical time period will be characteristic for the system, and you can evaluate the settings from this critical period.<br />
‘Tn’ = 0.85 x critical time period<br />
‘Xp’ = 2.2 x proportional band value in the critical time period<br />
If the regulation seems to be too slow, you can decrease the proportional band value by 10%. Make sure there is a consumption<br />
when you set the parameters.<br />
<strong>Danfoss</strong> District Energy VI.LG.U2.02 DEN-SMT/DK 85
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