Unical NOVAIREX 35, Инструкция по установке и обслуживанию

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48
3.15.3 - COMBUSTION AIR
ADJUSTMENT
PRIMARY AND SECONDARY AIR ADJUSTMENT
The NOVAIREX boiler is equipped with a combus-
tion air intake fan, a combustion air adjustment unit
and primary and secondary air regulators.
When commissioning the boiler, the primary and
secondary air need to be adjusted bearing in mind that the
primary air determines the boiler heat output and therefore the
amount of wood that is burned, and the secondary air completes
combustion.
The following are the optimal adjustments of primary and sec-
ondary air using good quality wood (beech) with low moisture
content (15%).
primary air secondary air
pos. pos.
NOVAIREX 34
3÷4 ~1
NOVAIREX 45 4÷5 1÷2
NOVAIREX 55 3÷4 1÷2
For proper air adjustment based on the type of wood used and
its actual moisture level, it is necessary to observe the flame
through the flame sight glass placed on the lower door. The flame
should fill about two-thirds of the lower combustion chamber
and gently lap the bottom cradle, without dragging too much
ash and without noise.
The flame must have an orange-pink-white colour, it must not too
transparent and the centre should tend towards blue.
To bring the flame to optimum conditions you should then ad-
just primary air by turning the knob (pos. P). Do the same for
secondary air (pos. S).
Example no.1
Thick damp wood that is difficult for combustion
S - Very closed (try to obtain the maximum dimension of the
flame, but not reddish in colour).
P - Reasonably open in order to obtain sufficient gasification.
Example no. 2
Very flammable wood logs
S - Completely open.
P - Slightly closed in order to keep gasification low, but sufficiently
open to evacuate the ash that might close the combustion head.
GENERAL ADVICE
- Better performance will be achieved after two or three days
of running. In fact the refractory material must be fired and
the tar must encrust the upper walls of the wood storage
compartment.
- The flame should have a good size and fairly fill the combus-
tion chamber.
- The flame should not be too red (lack of secondary air S).
- The flame should not be too blue (excess of secondary air
S).
- The flame should not be too noisy (excess of primary air P).
- The flame should not be too small (lack of primary air P).
- If the ashes do not go down well, increase the primary air (P).
- If too many ashes fall, decrease the primary air (P).
- If the chimney is smoky, open the secondary air (S) all the
way.
- If smoke continues to escape, open secondary air (S) to a
maximum, closing the primary air (P) partially as well.
AIR ADJUSTMENT FAULTS
1) If the primary air is excessive, a lot of ash and small pieces
of coal will fall. The flame is too fast, dry, has a cold colour and
is noisy.
The boiler is consuming a lot of wood and the door’s insulation
is white.
2) If the primary air is insufficient, the flame will be slow, hesitant,
affected by air currents and by the chimney draught, very small, it
will not be able to touch the lower cradle, with low ash production
and the door’s refractory insulation will be dark coloured.
3) If the secondary air is excessive, the flame will be small, of
bluish colour and very transparent.
4) If the secondary air is insufficient the flame will be big, it
will touch the lower cradle, it will completely fill the combustion
chamber and, above all, it will be red and not at all transparent.