Viessmann GC1 - Page 6

Ready for operationReady for operation
6
Overview of controls and indicators (continued) Vitotronic 300-K, MW1S
Adjustment of the display window
contrast
Open the hinged cover on the
prgramming unit, and press and, at
the same time, adjust the contrast with
the
or button.
Factory settings
Press this button to reset all altered
values to their factory settings. Please
note that all altered values are reset to
the factory settings.
Flashing data
Data flashing in the display window
means that new settings can be
entered.
Basic display
The basic display of the Vitotronic
300-K, MW1S shows the boiler
sequence. The display reverts to
showing the boiler sequence after
each setting is made on the control
unit.
Other display symbols
(These are not displayed
continuously, 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,
DHW pump ON
p Heating circuit pump ON
U
UU
U Fault message
V Mixing valve open
v Mixing valve closed
Select the heating ciruit - before every setting and scanning operation Vitotronic 300-K, MW1S
On heating systems with only one heating circuit, you can start making all
settings immediately.
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 (system circuit)
Heating circuit selector button : Heating circuit 2 with mixing valve
Heating circuit selector button
3
: Heating circuit 3 with mixing valve
The heating circuits are individually labelled by your heating contractor.
Press or or
3
; the following
buttons are illuminated:
the heating ciruit selector button
the current heating program
(see page 8)
the party or energy saving mode,
if selected (see page 10)
You can now start making the settings
and adjustments for the selected
heating 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, 2 or 3.”
Please note:
If no further settings are made, the
illumination of the the buttons is
extinguished after a short time.
5581 751 v1.1
Boiler sequence
1-23-4
Boiler temperature
Mo