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8.3
Differential temperature control using variable weighting factors
This function allows the return flow temperature, total (RüFg) to be taken into account in the con-
trol loop, in addition to the flow temperature, total (VFg).
The difference between the flow temperature, total (VFg) and return flow temperature, total
(RüFg) is specified using the Intended temperature difference parameter. It is a measure for the
energy consumption in a heating circuit. The greater the temperature difference, the larger the
energy required by a heating circuit. If the actual temperature difference is not the same as the
intended temperature difference, it is evaluated by the Kp factor for differential temperature
control . After initial signs for a deviation occur, the flow temperature is raised or reduced by this
factor.
When the Kp factor for differential temperature control is set to 0, the return flow temperature
does not have any effect on the control of the flow temperature.
When the Kp factor for differential temperature control is set to 1, a pure return flow tempera-
ture limitation takes place.
Function
Return flow sensor, total RüFg
8.4
Deactivation depending on outdoor temperature
The controller switches to the stand-by mode when Outdoor temperature limit causing change
to summer mode in rated operation during times-of-use or Outdoor temperature limit causing
change to summer mode in reduced operation outside times of use is exceeded.
Should the temperature fall below the limit, the heating is started again. The function for deacti-
vation depending outdoor temperature is set by default.
Parameter
Outdoor temperature limit causing change
to summer mode in rated operation
Outdoor temperature limit causing change
to summer mode in reduced operation
WE
Configuration
OFF
Co5 -> Fb02 = ON
10 °C
Intended temperature difference / 0 to 90 °C
0.5
Kp factor for differential temperature control /
0 to 1
WE
Parameter level / Range of values
22 °C
PA5 / 0 to 50 °C
10 °C
PA5 / –10 to 50 °C
System-wide functions
EB 5474 EN
53
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