Viessmann Vitotronic 300 Operating Instructions Manual page 8

Ready for operation
Changing the room temperature
Normal room temp.
Reduced room temp.
8
In the "Central heating and domestic hot water" heating program, central
heating takes place with alternating "normal room temperature" and "re
duced room temperature" according to the selected time program (see page
12).
You can set the required room temperature as follows.
To change the "normal room temperature" (day temperature)
Factory setting: 20 °C from 6.00 to
22.00 hrs.
The "normal room temperature" can
be set between 3 and 37 °C.
ºC
1. Press the heating circuit selector
button; the button is lit.
2. Set the required temperature value
with the "ts" selector knob.
The display changes after a short
time and shows the boiler tem
perature.
To change the "reduced room temperature" (night temperature)
Factory setting: frost protection 3 °C
from 22.00 to 6.00 hrs.
The "reduced room temperature"
can be set between 4 and 37 °C.
1. Open the hinged cover on the pro
gramming unit.
2. Press the heating circuit selector
button; the button is lit.
3. E Press E; the previous
temperature setting
flashes in the display win
ºC
dow.
4. a/b Press the a/b button
until the required tempera
ture value appears.
5. d Confirm by pressing d;
the temperature value
stops flashing and is
stored.
The display changes and
shows the boiler tempera
ture.
6. Close the hinged cover on the pro
gramming unit.
Example
Set to save energy at times when
rooms are not in use.
Please note:
If the temperature value 3 °C is
selected, "Frost protection"
appears in the display window.