15
MAINTENANCE
Combustion
The optimum calibration of the burner requires an analy-
sis of the flue gases. Significant differences with respect
to the previous measurements indicate the points where
more care should be exercised during maintenance.
Gas leaks
Make sure that there are no gas leaks on the pipework
between the gas meter and the burner.
Flame inspection window
Clean the flame inspection window (A).
Combustion head
Open the burner and make sure that all components of
the combustion head are in good condition, not
deformed by the high temperatures, free of impurities
from the surroundings and correctly positioned. If in
doubt, disassemble the elbow fitting 5)(B).
Servomotor
Disengage the cam 4)(D)p. 13 from the servomotor and
turn it backwards and forwards by hand to make sure it
moves freely.
Burner
Check for excess wear or loose screws in the mecha-
nisms controlling the air damper and the gas butterfly
valve. Also make sure that the screws securing the elec-
trical leads in the burner terminal strip are fully tight-
ened.
Clean the outside of the burner, taking special care with
the swivel joints and cam.
Combustion
Adjust the burner if the combustion values found at the
beginning of the operation do not comply with the regu-
lations in force, or do not correspond to good combus-
tion. Record the new combustion values; they will be
useful for subsequent controls.
TO OPEN THE BURNER (B):
- Switch off the electrical power.
- Loosen screws 1) and withdraw cover 2).
- Disengage the swivel joint 7) from the graduated sec-
tor 8).
- Fit the two extensions onto the slide bars 4).
- Remove screws 3), and pull the burner back by about
4” on the slide bars 4). Disconnect the probe and
electrode leads and then pull the burner fully back.
Now extract the gas distributor 5) after having removed
the screw 6) and disconnecting the pilot gas line.
TO CLOSE THE BURNER (B):
- Push the burner until it is about 4” 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 electrode
leads gently out until they are slightly stretched.
- Re-couple the swivel joint 7) to the graduated sector
8).
- Remove the two extensions from the slide bars 4).
- Connect the pilot gas line.
(A)
FLAME INSPECTION WINDOW
(B)
OPENING THE BURNER
D709
D2378
