Forced Operation Of The Pumps; Return Flow Temperature Limitation - Samson TROVIS 5573 Mounting And Operating Instructions

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 circulation 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 flow temperatures are preset. The return flow tem-
perature can be limited either to a value depending on the outdoor temperature (variable) or to
a fixed set point. When the temperature measured at return flow sensor RüF exceeds the limit
value, the set point of the flow temperature (flow temperature of the heating system, charging
temperature) is reduced. As a result, the primary flow rate is reduced and the return flow tem-
perature 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 algorithm).
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 circuits
of the controller to be deactivated. The set point reading (flow temperature of the heating,
charging temperature) blinks to indicate that a return flow limitation is active in the control cir-
cuit concerned.
Note: Using weather-compensated control with gradient characteristic, the return flow temper-
ature is limited to a fixed value by equating the Return flow temperature foot and Max. return
flow temperature (PA1, 2) parameters.
Functions
Return flow sensors RüF1/2
Return flow temperature
limitation with P algorithm*
* If CO5 -> F00 - 1 is indicated, access to the return flow, flow rate and heat capacity settings are
locked.
WE Configuration
1 CO1, 2, 4 -> F03 - 1
1.0 KP (limiting factor) / 0.1 to 10.0
0 CO5 -> F16
System-wide functions
EB 5573 EN
71