Operating instructions

139
4 8
°C
s A
Heating mode
The selected set boiler water tempera-
ture will be maintained when a demand
is being raised by the room thermostat
and the heating program is set to DHW
and central heating "
G
".
The boiler water temperature will be
maintained at the default frost protection
temperature when there is no demand.
The electronic temperature limiter inside
the burner control unit limits the boiler
water temperature.
Flow temperature setting range: 20 to
74 °C.
DHW heating with gas condensing combi boiler
If the flow switch detects that DHW is
being drawn off (> 3 l/min), the burner,
circulation pump and 3-way valve are
started or changed over. The burner
modulates to reach the DHW outlet tem-
perature and is limited on the boiler side
by the temperature limiter.
DHW heating with gas condensing boiler
The burner, the circulation pump and the
3-way valve are started or changed over
if the cylinder temperature lies 2.5 K
below the set cylinder temperature.
Function description
Constant temperature control unit
5772 909 GB
Service