Viessmann Vitoligno 300-P Service Instructions For Contractors page 118

Function description
Control functions
4. If
"Ñ" extinguishes, the flue gas test can
be carried out.
Emergency mode pumps
Removing the strapping plug X7 the LV supply to the relays K20 to K29 (see
page 122) will be interrupted. The heating circuit pump and the cylinder primary pump
are switched ON.
Vacuum supply system
The pellets are transported from the connector of the room discharge or the pellet
silo via a vacuum system into the boiler pellet hopper.
Supply process
If the charge motor is running, the time
that the motor is operational is captured.
This time enables a calculation as to the
amount of pellets that have been con-
sumed and when the next supply proc-
ess should be started. In addition, the
pellet sensor inside the pellet hopper will
confirm that a new pellet supply is
required.
If individual supply times have been con-
figured at the programming unit, then a
supply process can only be initiated
within the enabled times. If required, the
pellet sensor can initiate a supply proc-
ess at the end of the enabled time to fill
the pellet hopper once more.
If the supply process has been initiated,
the vacuum module is initially enabled to
remove pellets that remain inside the
pipework from the previous supply proc-
ess.
118
(cont.)
5. S to terminate the emissions
test function.
Afterwards, the cycling operation for the
discharge from the pellet store starts.
During this cycle, the vacuum module
and the discharge motor are regularly
started and subsequently stopped again.
This fills the vacuum container (in the top
of the pellet hopper) which then empties
into the hopper.
Once the pellet sensor inside the pellet
hopper recognises that the hopper is full
of pellets, the vacuum module remains
switched on for a while, followed by the
flushing time commencing to remove all
remaining pellets from the pipework.
That concludes the supply process.