Viessmann VITOLIGNO 250-S Operating Instructions Manual page 18

Start-up/shutdown
Recharging fuel
(cont.)
B
A
Fig. 11
1. Press the "START/STOP" button.
The flue gas fan starts up.
2. Initially open the hopper cover to lock
3. Wait a short while to allow the low temperature car-
bonisation gas to be drawn out of the hopper.
4. Turn mushroom handle
hopper cover. Fully open the cover.
5. Check the fuel level and the height of the glowing
embers.
If there are only glowing embers present, continue.
Steps to take in the event of overheating
The high limit safety cut-out protects your boiler from
overheating.
Note
Modifications to this component are prohibited and will
render all warranties void.
Replace faulty components only with genuine spare
parts from Viessmann.
18
.
A
clockwise to unlock the
B
6. Danger
Recharging the fuel too slowly, recharging
large amounts of logs or recharging with
pieces of residual wood encourages the for-
mation of low temperature carbonisation
gases in the hopper and can result in defla-
gration.
■ Recharge wood swiftly.
Never place pieces of residual wood, shav-
■
ings, sawdust, woodchips, wood briquettes
or residual wood with shavings directly onto
the glowing embers.
!
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).
Quickly recharge with fuel according to the current
heat demand.
7. Open the ash compartment cover if required.
This supports the combustion process. We recom-
mend this procedure if the flue gas temperature is
below 120 °C.
8. Close the hopper cover.
Note
If the boiler overheats again after a short time or over-
heats regularly, notify your heating contractor.