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, at night, the system is switched off at an outdoor tem-
perature of 10 °C to save energy. Nevertheless, remember that the system requires some time in
the morning to heat up the building (–> Outdoor temperature-dependent advance heating,
section 5.7).
Parameter
WE
Parameter level / Range of values
OT deactivation value
in reduced operation
10 °C
PA1, 2, 3 / –10 to 50 °C
5.5.3 OT activation value in rated operation
If a heating circuit is in reduced operation (automatic mode), the circuit is automatically trans-
ferred to rated operation when the outdoor temperature falls below the limit
OT activation value
in rated operation. When the limit value is exceeded (plus 0.5 °C hysteresis), reduced operation
is restarted.
This function is activated at very low temperatures to avoid the building cooling down exces-
sively outside the times-of-use when low outdoor temperatures occur.
Parameter
WE
Parameter level / Range of values
OT activation value
in rated operation
–15 °C PA1, 2, 3 / –30 to 50 °C
5.5.4 Summer mode
Summer mode is activated depending on the mean daytime temperature (measured between
7.00h and 22.00h) during the desired period.
If the mean daytime temperature exceeds the
Outdoor temperature limit in summer mode on
two consecutive days, summer mode is activated on the following day: the heating is switched
off. If the mean daytime temperature remains below the
Outdoor temperature limit in summer
mode on the next day, summer mode is deactivated on the following day.
Functions
WE
Configuration
Summer mode
OFF
01.06
30.09
18 °C
Co1, 2, 3 -> Fb11 = ON
Start summer mode / 01.01 (1 Jan) to 31.12 (31 Dec)
Stop summer mode / 01.01 to 31.12
Outdoor temperature limit in summer mode / 0 to 30 °C
44
EB 5179 EN
Functions of the heating circuit
