Viessmann Vitotronic 300 Operating Instructions Manual page 6

Ready for operation
Overview of controls and indicators
Other display symbols
(These are not displayed continu
ously, but appear according to
system type and operating status)
e Risk of freezing
s Central heating with normal
room temperature
m Central heating with reduced
room temperature
w Domestic hot water heating,
cylinder pump ON
p Heating circuit pump ON
V Mixing valve open
v Mixing valve closed
A Burner ON
Q Radio clock reception
Select the heating circuit
Boiler temperature
Mo
6
(continued)
Adjustment of the display window con
trast
Open the hinged cover on the program
ming unit, press d and, at the same
time, adjust the contrast with the a
or b button.
Factory settings e
Press this button to reset all altered
values to their factory settings.
Flashing data
Data flashing in the display window
means that new settings can be
entered.
before every setting and scanning operation
On heating systems with only one heating circuit, you can start making all
settings straightaway.
On heating systems with two or three heating circuits, the corresponding
heating circuit must be selected before carrying out each setting and
scanning operation.
Heating circuit selector button !: Heating circuit 1 without mixing valve
Heating circuit selector button ?: Heating circuit 2 with mixing valve
Heating circuit selector button §: Heating circuit 3 with mixing valve
The heating circuits are individually labelled by your heating contractor.
Press ! or ? or §; the following
buttons are lit:
H the heating circuit selector button
H the current heating program
(see page 7)
H the party or energy saving mode,
if selected (see page 9 and 10).
You can now start making the
settings and adjustments for the
selected heating circuit.
(system circuit)
If you have not selected the required
heating circuit before starting to
carry out the settings, the following
instruction appears in the display
window: "First select button 1 or 2"
or "First select button 1, 2 or 3".
If no further settings are made, the
illumination of the buttons is ex-
tinguished after a short time.