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Function
Differential temperature control using variable
weighting factors
Parameters
Max. return flow temperature*
Min. return flow temperature*
*
Can only be selected when Co5 -> Fb01 = ON, select: steig
Note!
Only one function can be assigned to an analog output (e.g. flow temperature control, passing
on the outdoor temperature or differential temperature control).
5.5 Deactivation depending on outdoor temperature
5.5.1 OT deactivation value in rated operation
If the outdoor temperature exceeds the limit OT deactivation value in rated operation , the affected
heating circuit is put out of service immediately. The valve is closed and the pump is switched off
after t = 2 x Valve transit time . When the outdoor temperature falls below this value (less 0.5 °C
hysteresis), heating operation is restarted immediately.
With the default settings, this means that, during the warm season, the system is switched off at an
outdoor temperature of 22 °C.
Parameter
OT deactivation value
in rated operation
5.5.2 OT deactivation value in reduced operation
If the outdoor temperature in reduced operation exceeds the limit OT deactivation value in re-
duced operation , the affected heating circuit is put out of service immediately. The valve is closed
and the pump is switched off after t = 2 x Valve transit time .
WE
Configuration
OFF
Co1, 2, 3 -> Fb18 = ON
0.5
Proportional gain factor K
200 s
Reset time T
20 °C
Intended temp. difference / 0 to 40 °C
90 %
Analog value max. / 0 to 100 %
30 %
Analog value min. / 0 to 100 %
WE
Parameter level / Range of values
65 °C
PA1, 2, 3 / 20 to 90 °C
20 °C
PA1, 2, 3 / 20 to 90 °C
WE
Parameter level / Range of values
22 °C
PA1, 2, 3 / 0 to 90 °C
Functions of the heating circuit
/0.1 to 999
P
/ 1 to 999 s
N
EB 5179 EN
43
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