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The measured temperature reading (return flow temperature) and the set point reading (flow
temperature of the heating, charging temperature) blink to indicate that a return flow limitation
is active in the control circuit concerned. In systems Anl 2, 3, 7, 8 and 9, the
Return flow limita
-
tion temperature
parameter during DHW heating is used for limitation in the primary circuit
while the DHW heating is active. The systems Anl 4, 5, 6 and 11 allow a separate return flow
sensor to be installed in the DHW circuit.
To ensure that the preset
Return flow temperature limit temperature duringDHW heating
can be
met, make sure that:
– the heating characteristic is not adjusted to ascend too steeply,
– the speed of the circulation pumps is not set too high,
– the heating systems have been calibrated.
Note!
For outdoor temperature dependent control with gradient characteristic, the return flow tempe
-
rature is limited to fixed set point by entering the same value for both
Maximum return flow tem-
perature
and
Minimum return flow temperature
parameters.
Functions
WE Configuration
Return flow sensor RüF1 ON
1
FB20 = ON
Limiting factor / 0.1 to 10
Return flow sensor RüF2 OFF
1
FB21 = ON
Limiting factor / 0.1 to 10
Parameters
WE Range of values
Gradient, return flow 1.2 0.2 to 3.2
Level, return flow 0 °C –30 to 30 °C
Maximum return flow temperature 65 °C 20 to 90 °C
Minimum return flow temperature 65 °C 20 to 90 °C
Return flow temperature limit temperature during
DHW heating
65 °C 20 to 90 °C
Note!
In systems Anl 2, 5, 7 and 9 The function block setting FB20 = ON or FB21 = ON provides two
switching conditions for the storage tank charging pump (SLP) that can be selected when the
heating circuits are switched off:
(1) SLP switched on regardless of the return flow temperature
(2) SLP switched on depending on the return flow temperature
58 EB 5476 EN
System-wide functions