Samson TROVIS 5575 - Forced Operation of the Pumps; Return Flow Temperature Limitation

7.3 Forced operation of the pumps
When the heating circuit pumps have not been activated for 24 hours, forced operation of
the pumps is started between 12.02h and 12.03h. This is done to avoid that the pumps get
stuck when they are not operated for a longer period of time. In the DHW circuit, the circula
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tion pump is operated between 12.04h and 12.05h, the other pumps between 12.05h and
12.06h.
7.4 Return flow temperature limitation
The temperature difference between the flow and return flow indicates how well the energy is
used: the greater the difference, the higher the efficiency. A return flow sensor is sufficient to
evaluate the temperature difference when the network flow temperatures are determined. The
return flow temperature can be limited either to a value depending on the outdoor tempera
-
ture (variable) or to a fixed value. When the temperature measured at return flow sensor RüF
exceeds the limit value, the set point of the flow temperature (flow temperature of the heat-
ing, charging temperature) is reduced. As a result, the primary flow rate is reduced and the
return flow temperature falls. In systems Anl 2.x and 4.1, the
Max. return flow temperature
parameter (PA4 level) is used for limitation in the primary circuit during DHW heating if it is
greater than the parameter valid for the primary circuit. The
Limiting factor determines how
strongly the controller responds when the limit values are exceeded in either direction (PI al-
gorithm).
If just P-action is to be implemented, set CO5 -> F16 - 1. This allows the I-action in the return
flow temperature limitation algorithm of all control circuits 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 temperature
is limited to a fixed value by equating the parameters
Return flow temperature foot and Max.
return flow temperature
(PA1, 2).
Note!
If CO5 -> F00 - 1 is indicated, access to the return flow, flow rate and heat capacity settings
are locked.
EB 5575 EN 75
System-wide functions