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
Frost protection measures become effective whenever the outdoor temperature falls below the
Frost protection limit.
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 automatically only when stand-by
mode has been adjusted at the mode selector switch in all heating circuits. 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 CO5 -> F09 - 0
3 °C Frost protection limit / –15 to 3 °C
Frost protection program II CO5 -> F09 - 1
3 °C Frost protection limit / –15 to 3 °C
Note!
Frost protection operation of a pump, a heating circuit or the DHW circuit is active only
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.
74 EB 5575 EN
System-wide functions
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