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5.8
Air damper setting
Air damper adjustment is performed by acting on the variable
profile cam. This operation is performed after having adjusted the
pressure variator and the combustion head.
With the burner on, remove voltage from the servomotor,
detaching the fast-on pin located on the electrical control panel,
and release movement by pressing on release.
Calibrate maximum output, minimum output and intermediate
outputs in this order.
Having completed the adjustment, re-check all calibrations, reset
the electrical connections of the servomotor and secure the
adjustment screws with the crossways screws.
5.8.1
Modifying air damper tie-rod length
It is recommended to extend the tie-rod when the air gate valve
moves within a reduced angle (air damper at about half travel of
maximum output); this helps avoid giving the cam too curved a
profile.
With the burner off, proceed as follows:
detach ball-joint 2) from lever 1);
unscrew extension 3) a few turns from tie-rod 4);
reconnect the ball-joint to the lever and raise the cam profile
until the air damper index returns to 0 with the servomotor
at 0°.
5.9
Nozzle installation
The burner complies with the emission requirements of the EN
267 standard. In order to guarantee that emissions do not vary,
recommended and/or alternative nozzles specified by Riello in
the Instruction and warning booklet should be used.
It is advisable to replace the nozzle once a year
during periodical maintenance.
ATTENTION
The use of nozzles other than those specified by
Riello S.p.A. and inadequate regular maintenance
may result into emission limits non-conforming to
the values set forth by the regulations in force, and
in extremely serious cases, into potential hazards
to people and objects.
CAUTION
The manufacturing Company shall not be liable
for
any
such
observance of the requirements contained in this
manual.
Do not use any sealing products such as:
gaskets, tape or sealants.
Be careful to avoid damaging the nozzle
sealing seat.
ATTENTION
The nozzle must be screwed into place tightly
but not to the maximum torque value
provided by the wrench.
20176605
Installation
damage
arising
from
non-
Key
1
Lever
2
Articulated coupling
3
Extension
4
Tie-rod
5.9.1
Recommended nozzle
Select the nozzle, with nominal output slightly higher than the one
actually required, among the following types:
Model
Fluidics
Bergonzo
Angles of 45° - 50° are normally recommended. For narrow
combustion chambers, use nozzles with angles of 30° - 35°.
5.9.2
Adjusting the nozzle pin opening rod
When installing for the first time and after performing any mainte-
nance work or changing the nozzle, reset lever as specified be-
low:
with the nozzle fitted, loosen the nut with extension
screw in extension by hand until you have eliminated all play
on lever;
unscrew by a half turn (lever with approx. 0.5 mm of play).
NOTE:
The nozzle pin's stroke varies depending on the size and
make of the nozzle (Bergonzo o Fluidics).
We advise you to use maximum stroke, as
described above, to ensure the nozzle pin opens
fully;
atomisation.
ATTENTION
18
GB
D1389
Nozzle
type W2
type B3 or B5
incomplete
opening
results
Fig. 13
in
poor
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