7
System-wide functions
7.1
Automatic summer time/winter time changeover
The clock is automatically adjusted on the last Sunday in March at 2.00h and on the last
Sunday in October at 3.00h.
Function
WE
Configuration
Summer time/winter time changeover
1
CO5 -> F08 - 1
7.2
Frost protection
Depending on the switching state of the function block CO5 -> F09, frost protection mea-
sures are taken when the outdoor temperature falls below +3 °C. On selecting the frost pro-
tection program I, the
Frost protection limit can be adjusted. The hysteresis to cancel the frost
protection measures is always 1 °C.
4
Frost protection program I (restricted frost protection): frost protection measures are taken
only when all heating circuits in the system are in stand-by mode. The circulation pumps
are forcedly switched on and their flow temperature set points are adjusted to 10 °C. The
circulation pump in the DHW circuit is switched on forcedly only when the heating opera-
tion of all heating circuits is suspended in optimizing mode, or when stand-by mode has
been adjusted at the rotary switch. Nevertheless, the storage tank is always recharged to
10 °C if the storage tank temperature falls below 5 °C.
4
Frost protection program II: the heating circuit circulation pumps are always switched on
forcedly. The flow temperature set points of all heating circuits currently in stand-by mode
are set to +10 °C. In the DHW circuit, the circulation pump is always activated. If the
storage tank temperature falls below +5 °C, the storage tank is recharged to +10 °C.
Functions
WE
Configuration
Frost protection program I
3 °C
CO5 -> F09 - 0
Frost protection limit / –15 to 3 °C
Frost protection program II
CO5 -> F09 - 1
Note!
Frost protection operation of a pump, a heating circuit or the DHW circuit is only active
when the frost protection icon
is indicated on the display.
Fixed set point control without outdoor temperature sensor does not include frost protection
in stand-by mode.
EB 5576 EN
71
System-wide functions
