If the time-controlled summer time operation is active, heating operation will not start even at
lower outdoor temperatures when the time-of-use starts.
The time-controlled summer time operation is only deactivated when the daytime mean tem-
perature falls below the outdoor temperature limit value on the corresponding number of sub-
sequent days.
(Setting in the configuration level linked to the function block setting FB 3 = ON. Default: 1 day
to deactivate the time-controlled summer time operation setting range 1...3)
If the heating system is also deactivated due to the parameters Outdoor temperature limit value
for summer time operation and the Time-controlled summer time operation, the heating is not
reactivated when the temperature falls by approx. 0.5 °C below the values in the above men-
tioned parameters.
Info display about the time-controlled summer time operation.
If the display of the outdoor temperature is selected (function block FB 3 = ON) in the operating
level when the summer time operation is activated and the key is held down, the daytime
mean temperature is displayed.
The bars at the top of the display show the temperature curve over the past 8 days. The black
areas show where the temperature exceeded the limit value and the empty areas where the tem-
perature fell below the limit value. A black area marked 1, for example, means that the outdoor
temperature limit was exceeded on average on the previous day.
4.5 Automatic clock reset summer time/winter time
When you set the function block FB 5 = ON, the controller automatically resets the clock on the
last Sunday in March from 2:00 to 3:00 hrs and on the last Sunday in October from 3:00 to
2:00 hrs.
4.6 Public holidays and vacations
The controller lets you define 20 public holidays and 10 vacation periods (parameter level).
There is no default setting for public holidays.
On public holidays, the heating system operates based on the data entered for Sundays (heat-
ing time schedule); during vacations, the heating runs in reduced or standby operation.
The drinking water heating is not affected by public holidays and vacations when the controller
operates using default settings. When you activate the function block FB 6 = ON, the drinking
water heating will then operate on public holidays using the same time schedule entered for
Sundays (time schedule for drinking water heating). Subsequently, the drinking water heating is
then not active during vacations (frost protection monitoring from +5 °C downwards).
4.7 Delayed outdoor temperature adaptation
This function is used to determine the flow temperature set point using a calculated outdoor tem-
perature which is delayed either:
a) only when the outdoor temperature decreases, or
b) regardless of the outdoor temperature.
For instance, if the outdoor temperature varies by 12 °C within a very short time , the Calcu-
lated outdoor temperature is adapted to the outdoor temperature in small steps over a time
period of 4 hours with a delay setting of 3 °C/hr. This function helps to prevent heating system
overloads in combination with overheated buildings, or temporarily insufficient heating due to
short-term outdoor temperature variations, e.g. caused by warm winds or excessive solar radi-
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