25
7.6 Regulation
Usually, the correct combustion is obtained upon reaching of the correct ratio between
fuel amount and comburent air amount. In ideal combustion conditions, a clear and lumi-
nous flame is generated, easily visible from the porthole. (
fig. 3.3.1.A
)
7.7 Primary and secondary comburent air regulation
The correct amount of primary and secondary comburent air depends on the type and
consistency of the used fuel. Excellent combustion will be obtained after repeated adjust-
ment interventions, conditioned by the used fuel.
The comburent air is regulated manually by acting on the knobs indicated in
fig.7.7.1 and
7.7.3
. Once the fuel capacity has been fixed (see paragraph 7.8) depending on the power
of the boiler and the relative consumption (see
tab.3.4.1
), the primary air can be opti-
mised with recommended regulation during the interval between 5 and 6. The secondary
air can be regulated during interval 4 and 5. (
fig. 7.7.2 and fig.7.7.4
).
fig. 7.7
7.5 Occasional heat request condition
The control unit allows connecting an external timer to avoid the fuel inside the firebox
going out and the consequent re-ignition operations, in the event of no hot water request
for long periods. This device allows the control unit to activate the screw at regular inter-
vals, providing sufficient fuel to maintain the firebox ignited.
fig. 7.7.1
fig. 7.7.2
fig. 7.7.4
fig. 7.7.3
knob regulation secondary
comburent air
knob regulation primary
comburent air
