20
Gas leaks
Make sure that there are no gas leaks on the
pipework between the gas meter and the burner.
Gas filter
Change the gas filter when it is dirty.
Servomotor
Disengage the cam 4)(B)p.15 from the servo-
motor, by pressing and moving button 3)(A)p.16
towards the right, and turn it backwards and for-
wards by hand to make sure it moves freely.
Now engage the cam again by moving the but-
ton 2)(A)p.15 to the left.
Burner
Check for excess wear or loose screws in the
mechanisms controlling the air gate valve and
the gas butterfly valve. Also make sure that the
screws securing the electrical leads in the
burner terminal strip are fully tightened.
Clean the outside of the burner, taking special
care with the transmission joints and cam
4)(B)p.15.
Combustion
Adjust the burner if the combustion values found
at the beginning of the operation do not comply
with the regulations in force, or at any rate, do
not correspond to good combustion. Use the
appropriate card to record the new combustion
values; they will be useful for subsequent con-
trols.
GAS COMBUSTION CHECKS
CO
2
It is better to set the burner with CO
2
not higer
than 10% (gas with Pci 8600 kcal/m
3
). this way
avoiding a loss of calibration setting (for exam-
ple draft variation) that could cause combustion
with little air and the production of CO.
CO
It must be not higher than 100 mg/kWh.
TO OPEN THE BURNER (A)
- Loosen screws 1) and withdraw the cover 2)
- Disconnect the light-oil pipes 7)
- Disengage the articulated coupling 8) from the
graduated sector 9).
- Remove the screws 10) from the two slide bars
4).
- Fit the two extensions onto the slide bars 4).
- Replace the screws 10) onto the two slide
bars.
- Remove screws 3) and pull the burner back by
about 100 mm on the slide bars. Disconnect
the electrode leads and then pull the burner
fully back.
- Now extract the internal part 5) after having
removed the screw 6).
TO CLOSE THE BURNER (A)
- Push the burner until it is about 100 mm from
the sleeve.
- Re-connect the leads and slide in the burner
until it comes to a stop.
- Refit screws 3), and pull the probe and elec-
trode leads gently out until they are slightly
stretched.
- Re-couple the articulated coupling 8) to the
graduated sector 9).
- Reconnect the light-oil pipes 7).
- Remove the two extensions from the slide
bars 4) and return them to their original posi-
tion.
Disconnect the electrical supply from
the burner by means of the main sys-
tem switch.
(A)
D3179
DANGER
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