Display And Operating Elements - Viessmann VITOLIGNO 300-C Installation And Service Instructions Manual

Vitoligno 300-C Installation/Service

Display and Operating Elements

Legend
A Display of operating phase
B Start-stop pushbutton
C Dialogue line
Start-stop pushbutton function
Start-stop pushbutton:
Does not illuminate
Illuminates
Flashes
Flashing slowly

Flashing rapidly

Back key
ä
Return to the previous step in the menu or cancel
a setting that has been started.
Cursor keys
Scroll through the menu or adjust values.
Confirm selection or save the setting made.
d
? Call up help text in connection with the selected
menu point.
Call up the extended menu.
å
The boiler is off; no frost protection.
The boiler is in standby mode and will start automatically
on demand or the boiler is operating.
The boiler completely burns the available fuel
or
An external demand via coding address 44 was activated
Note: The start-stop pushbutton is disabled if an external
programming unit is connected. The boiler can only
be switched on and off via the external unit.
Contact at plug sMÖ closed. There is an external demand.
Contact at plug sMÖ open. There is no current demand.
Function of appliance power switch
Behind cover A are the reset button (green) for the high
limit safety cut-out and the appliance power switch.
The appliance power switch is used to isolate the control
unit from the power supply. It does not turn off the main
power supply.
There are live components inside the control unit
enclosure even after turning off.
Prior to completing service work on the boiler, disconnect
power at the power supply.
WARNING
Live components can cause severe injuries. When carrying
out maintenance work, isolate the entire system from the
power supply and check that it is no longer live.
Function description
127