Samson TROVIS 5579 Mounting And Operating Instructions

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Samson TROVIS 5579 Mounting And Operating Instructions Manual pdf 96 page image

7.3 Forced operation of the pumpsWhen the heating circuit pumps have not been activated for 24 hours, forced operation ofthe pumps is started between 12.02h and 12.03h. This is done to avoid that the pumps getstuck when they are not operated for a longer period of time. In the DHW circuit, the circula-tion pump is operated between 12.04h and 12.05h, the other pumps between 12.05h and12.06h.7.4 Return flow temperature limitationThe temperature difference between the flow and return flow indicates how well the energy isused: the greater the difference, the higher the efficiency. A return flow sensor is sufficient toevaluate the temperature difference when the flow temperatures are preset. The return flowtemperature can be limited either to a value depending on the outdoor temperature (vari-able) or to a fixed set point. When the temperature measured at return flow sensor RüF ex-ceeds the limit value, the set point of the flow temperature (flow temperature of the heatingsystem, charging temperature) is reduced. As a result, the primary flow rate is reduced andthe return flow temperature falls.In systems Anl 2.x, 3.1-3.4, 4.1-4.3, 5.1, 5.2, 7.x, 8.x and 9.x, theMax. return flow tem-perature parameter (PA4 level) is used for limitation in the primary circuit during DHW heat-ing if it is greater than the parameter valid for the primary circuit. In systems Anl 7.x, 8.xand 9.x with additional return flow sensor RüF2, aMax. return flow temperature parameterthat is set to a lower limit (PA4 level) only leads to a limitation in the DHW circuit at first; thereturn flow temperature limitation in the primary circuit only starts when the higher returnflow temperature limit valid for that circuit is exceeded. TheLimiting factor determines howstrongly the controller responds when the limit values are exceeded in either direction (PI al-gorithm).If just proportional component is to be implemented, set CO5 -> F16 - 1. This allows the inte-gral-action component in the return flow temperature limitation algorithm of all control cir-cuits of the controller to be deactivated.The set point reading (flow temperature of the heating, charging temperature) blinks to indi-cate that a return flow limitation is active in the control circuit concerned.Note: Using weather-compensated control with gradient characteristic, the return flow tem-perature is limited to a fixed value by equating the Return flow temperature footand Max.return flow temperature(PA1, 2, 3) parameters.96 EB 5579 ENSystem-wide functions