7VEDEX 3300
For Home Owners
Wood firing
Lighting instructions
It is important that initial firing is carried out carefully in a
new boiler so that any remaining crystallisation water in
the ceramics is condensed slowly to prevent cracking.
■ Add approximately 4 kg of finely chopped kindling
wood and then tightly screwed up newspaper on top.
Light the newspaper and leave the filler door ajar.
■ Wait until the wood has caught fire properly (flue gas
temperature approximately 130 – 150°C) and the
green light comes on.
■ Close the door and let the fire burn to a bed of em-
bers, approximately 30 – 45 minutes depending on the
amount of wood.
■ Once a bed of embers has been created, more wood
can be added.
■ Check that the flue gas temperature rises, this is a sign
that combustion has started.
The boiler is now in normal operating mode.
■ Add more wood when a bed of embers remains at the
bottom of the hearth.
Adding wood
Add wood via the filler door. When this door is opened, a
microswitch is affected, which, in turn increases the speed
of the fan.
It is important that the amount of fuel is adjusted accord-
ing to the temperature levels in the accumulator system so
that it does not become overcharged.
Even out the embers before adding more wood. Then
close the filler door. The speed of the fan now slows and
normal operation is resumed.
VEDEX 3300 is designed for 0.5 m long pieces of wood.
Stack the wood well when adding. Place the logs so that
they do not block the grate hole, see an example of po-
sitioning in the images below. If shorter pieces of wood
are used, stack these over the grate hole towards the rear
wall.
■ When the wood in the boiler has been burned and the
flue gas temperature drops to 80 – 85 °C, and a mini-
mal bed of embers remains, the green light should go
out, if not, readjust the flue gas thermostat.
It is now set and should not normally need further
adjustment. At the next firing proce-
dure, the green light automatically
comes on when the flue gas tem-
perature has reached approximate-
ly 130 – 150 °C.
Readjustment
The flame can be checked through the sight glass af-
ter about 30 minutes operation. The colour of the flame
should then be yellow with a light blue tint.
The following points should be observed for VEDEX 3300
to perform optimally:
■ Follow the lighting procedure by checking the flue gas
temperature.
■ The fan should never stop during the firing cycle.
■ When the accumulator is fully charged, there should
no longer be any wood in the wood magazine.
■ Never open the combustion chamber door during op-
eration.
■ The combustion of wood can vary depending on its
moisture content and type as well as on the position of
the primary air damper.
If the wood burns as in
case (A), the air supply is
too great from the top and
too low from the middle.
If the wood burns as in
case (B), the air supply is
too great from the middle
and too low from the top.
The correct air flow as per
case (C) gives the most ef-
ficient combustion.
It is not necessary to adjust the primary air damper if
any of cases (A) and (B) occur on the odd occasion.
A
B
C
LEKLEK
Wood firing
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