Viessmann VITOLIGNO 300-C Installation And Service Instructions Manual page 124

Diagnosis and service scans
Checking the changeover unit
This function is for testing or manually switching the
changeover unit.
Caution
Incorrect operation of the changeover unit can
cause a blockage in the vacuum system.
When the "Suction" function is active, observe
the fill level of the pellet hopper.
Only activate the "Flush" function when the suc-
tion wand is empty.
Calling up the "Changeover unit" menu
1. + Simultaneously for approx. 4 seconds
d
å
The "Service" menu appears.
2. / For "Service functions"
| ~
3. To confirm
d
4. / For "Changeover unit"
| ~
5. To confirm
d
6. / To position the changeover unit
Icons and text in the menu
"2" to "8" Number and ID of suction wands
present in the pellet store
Note
The number of wands can be set in
the code. See chapter "Codes",
"Charging" group.
Suction wand blocked
Maximum runtime of the suction
wand has been exceeded.
Flushing of suction wand active
Note
The icon is displayed if the "Flush"
function has been pre-selected in
the "Extended menu" of the control
unit.
"LS zero" Limit switch at zero point of change-
over unit
Note
before "LS zero" indicates that
the limit switch is actuated at the
zero point of the changeover unit .
"LS position" Limit switch for the position of the
changeover unit per vacuum unit
Note
before "LS position" indicates
that the limit switch is actuated at
position
124
or .
7. To activate the vacuum module.
d
Note
The vacuum module only remains active
while the key is being pressed.
Only possible if the changeover unit has
reached the position.
8. Until the default display is shown.
ä
Note
This function is only available for discharge systems
with changeover unit.
"PS pellet hose" Proximity sensor in pellet hose for
fuel detection during the suction
process
Note
before "PS pellet hose" indicates
that the proximity sensor is detect-
ing pellets in the pellet hose.
Actual position
Current position of the changeover
unit
Set position
Required position of the change-
over unit
Position for suction by the marked
suction wand
Position for flushing by the "left-
hand" suction wand
Suction wand has already been
started up in this cycle.
The runtime of the suction wand
has been reached.
Suction wand has not yet been
started up in this cycle.