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Flame inspection window
Clean the glass of the flame inspection window.
Switchboard maintenance (Fig. 35)
If it is necessary to carry out maintenance on the switchboard (1)
it is possible to remove only the fan unit (2), to allow improved
access to the electrical components.
With the burner open as in Fig. 35, unhook the tie-rod (3),
removing the screw on the variable profile cam, and extract it
from the tip (4).
At this point, disconnect the cables relating to the air pressure
switch, the servomotor and fan motor.
Remove the 3 screws (5) positioned on the protective cover.
Removing the 2 screws (6), it is possible to unthread the fan unit
(2) from the guides (7).
Finally, you can use 2 of the 3 screws (5) to fix the electrical
switchboard to the pipe coupling, in the points indicated in
Fig. 36, and then carry out the maintenance operations.
Maintenance
D3876
Fig. 35
D3877
Fig. 36
33
7.2.4
Combustion control (gas)
Carry out an analysis of the combustion flue gases.
Significant
differences
measurements indicate the points where most care should be
exercised during maintenance.
If the combustion values measured before starting maintenance
do not comply with applicable Standards or do not indicate
efficient combustion, consult the table below or contact our
Technical Support Service to implement the necessary
adjustments.
EN 676
Theoretical max
CO
GAS
2
0 % O
2
G 20
11.7
G 25
11.5
G 30
14.0
G 31
13.7
CO
2
It is advisable to adjust the burner with a CO
about 10% (gas with Ncv 8600 kcal/m3). In this way it is avoided
that a small decalibration (for example a variation in the tension)
could cause a combustion with an air defect and with the
subsequent formation of CO.
CO
It should not exceed 100 mg/kWh.
7.2.5
Safety components
The safety components must be replaced at the end of their life
cycle indicated in Tab. L.
The specified life cycles do not refer to the warranty terms
indicated in the delivery or payment conditions.
Safety component
Flame control
Flame sensor
Gas valves (solenoid)
Pressure switches
Pressure adjuster
Servomotor (electronic
cam) (if present)
Oil valve (solenoid)(if
present)
Oil regulator (if present)
Oil pipes/ couplings
(metallic) (if present)
Flexible hoses (if present)
Fan impeller
GB
with
respect
to
the
Air excess
Max. output
Max. output
1.2
1.3
CO
% Calibration
2
= 1.3
= 1.2
9.7
9
9.5
8.8
11.6
10.7
11.4
10.5
not greater than
2
Life cycle
10 years or 250,000
operation cycles
10 years or 250,000
operation cycles
10 years or 250,000
operation cycles
10 years or 250,000
operation cycles
15 years
10 years or 250,000
operation cycles
10 years or 250,000
operation cycles
10 years or 250,000
operation cycles
10 years
5 years or 30,000 pressurised
cycles
10 years or 500,000 start-ups
previous
CO
mg/kWh
1000
1000
1000
1000
Tab. K
Tab. L
20159324
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