Samson TROVIS 5431, Mounting And Operating Instructions

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door temperature limit value for deactivation
in reduced operation’ (default value 15 °C),
the heating system is deactivated by the clos-
ing of the control valve and deactivation of
the heating circulation pump HCP after the
‘Lag time’ (PA1, default value 180 s) has
elapsed. If the outdoor temperature falls
below the ‘Limit value for reactivation of
rated operation in reduced operation’ (PA1,
default value
-
15 °C) , the flow set point is
not set-back during the times of non-use.
5.4.3 Limitation of return flow temperature (CO-SYS F01)
A return flow sensor must be connected for
this function.
With the function block setting F01-1, the
return flow temperature can be limited. If the
measured return flow temperature exceeds
the value calculated on the basis of the
selected return flow characteristic, e.g. by 2
°C, the flow set point is reduced by 2 °C mul-
tiplied with the parameter ‘Return flow limita-
tion factor’ (default value 1.0). As a result,
the primary flow rate is reduced with the
effect that the return flow temperature drops.
In case of the limitation, the flow set point
indicator as well as the measured return flow
temperature value blink in the display.
5.4.4 External request (CO-SYS F10, F11)
Use the following functions in complex heat-
ing systems to pass on the flow set point tem-
perature values from one controller to the
next controller (request for externally
required signal), or to define one controller
as the primary control valve’s controller
which controls the highest requested flow set
point of all downstream controllers (process-
ing of externally required signal).
Request for externally required signal (CO-SYS F10, F11)
This function can be selected for all systems.
It is activated via CO-SYS F10-1. The exter-
nal flow set point of the preceding controller
is supplied to the analog input AI. In this
case, 0 to 10 V correspond to 120 °C. The
controller compares the supplied value to its
own set point and the higher value is then
passed on to the next controller at the analog
output. If this function is set, we recommend
that the flow sensor FS2 is used for the drink-
ing water heating.
Processing of externally required signal (CO-SYS F11-1)
This function can be selected for systems 1,
4, and 5. By using CO-SYS F11-1, the heat-
ing controller is configured as primary con-
troller for controlling the primary valve. It is
supplied with the signalled request (analog
input AI), compares it to its own flow set
EB 5431 EN
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Functional descriptions