Vacuum Supply Systems; Pellet Combustion Sequence Chart - Viessmann VITOLIGNO 300-C Installation And Service Instructions Manual

Vitoligno 300-C Installation/Service
Vacuum Supply System

Pellet Combustion Sequence Chart

Flue gas fan
Supply motor
Ignition element
Air dampers
Secondary
heating surface
cleaning and
grate cleaning
Legend
A' Burner start initiation
A Purge phase
B Ignition phase starts
C Ignition
D 2nd ignition phase
E Control mode
F Stop
G Idle state
A Output-dependent control
A'
ra1 Purge speed
ra2 Ignition speed
ra3 2nd ignition phase speed
ra4 Stop speed
e1 Charge time entry
e2 2nd ignition phase entry
z Ignition on
A vacuum system transports the pellets from the
connector of the room discharge or pellet silo into the
pellet hopper on the boiler.
Supply process
When the feed motor is running, the duration of the motor
operation is recorded. The recorded time is used to
calculate the amount of pellets consumed and when the
next supply process should be started. In addition, the
pellet sensor in the pellet hopper has to confirm that a
new pellet supply is required.
If individual supply times have been configured at the
programming unit, a supply process can only be initiated
within the enabled times. If required, the pellet sensor can
initiate a supply process at the end of the enabled time.
The pellet hopper will be completely filled once more.
If the supply process was initiated, the vacuum module
is initially activated. Pellets that remain in the pipework
from the previous supply process are removed.
After this, the cycling operation for the discharge from
the pellet store is started.
l1 Air damper calibration
l2 Air damper purge position
l3 Air damper ignition position
l4 Air damper 2nd ignition phase (controlled)
l5 Air damper stop position
w1 Secondary heating surface cleaning
r1 Grate cleaning
Function Description
A
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