Viessmann VITOLIGNO 250-S Operating Instructions Manual page 16

Start-up/shutdown
Heat-up
(cont.)
Charging with fuel and igniting
Important information
■ Charge with fuel according to the heat demand.
■ Fill the hopper completely if the outside temperature
is low and the heating water buffer cylinder is cold. In
spring and autumn, only charge as much fuel as
required for the actual heat demand and buffer vol-
ume.
■ Before starting up the boiler, ensure that the amount
of heat generated can be drawn off and stored by the
heating system. If the amount of heat produced can-
not be drawn, the boiler will overheat and the high
limit safety cut-out will respond. The boiler is then
cooled with cold tap water via the safety heat
exchanger and heating energy is lost.
Danger
The wrong kind of fuel during heat up encour-
ages the formation of low temperature carboni-
sation gases in the hopper and can result in def-
lagration.
Never place pieces of residual wood, shavings,
sawdust, woodchips, wood briquettes or residual
wood with shavings directly onto the grate.
!
Please note
If the boiler is charged incorrectly with pieces of
residual wood, wood briquettes and residual
wood with shavings it may be damaged.
1. Fill the hopper with logs up to at least one
third of its capacity.
This is achieved when the fireclay bricks in
the combustion chamber are no longer visible
and the grate is fully covered with logs.
2. Do not charge with other fuels before this is
achieved.
16
Fig. 9
Charcoal remains
A
Paper, cardboard
B
Pieces of wood
C
Logs
D
Hopper cover
E
01. Remove fine ash from the hopper. Use a scraper
to push the fine ash into the ash pan.
!
02. Please note
If the logs are too big, they will impair the
function of the boiler and may damage it.
Take the depth of the hopper and size of the
hopper cover into account when selecting
logs. Never exceed the maximum log length
(see page 48).
Place paper, cardboard
kindling C on charcoal remains
Note
The layer should be roughly 25 cm thick and
should cover the entire grate.
03. Place logs
D in the hopper so they are horizontal
and densely packed across the entire width of the
boiler.
04. Remove any dirt that may be present on the seat-
ing faces of hopper cover
E
D
C
B
A
B and easily combustible
A .
.
E