33
20159324
GB
Maintenance
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.
7.2.4
Combustion control (gas)
Carry out an analysis of the combustion flue gases.
Significant differences with respect to the previous
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.
Tab. K
CO
2
It is advisable to adjust the burner with a CO
2
not greater than
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.
Tab. L
Fig. 35
D3876
Fig. 36
D3877
EN 676
Air excess
CO
Max. output
1.2
Max. output
1.3
GAS
Theoretical max
CO
2
0 % O
2
CO
2
% Calibration
mg/kWh
= 1.2
= 1.3
G 20
11.7
9.7
9
1000
G 25
11.5
9.5
8.8
1000
G 30
14.0
11.6
10.7
1000
G 31
13.7
11.4
10.5
1000
Safety component
Life cycle
Flame control
10 years or 250,000
operation cycles
Flame sensor
10 years or 250,000
operation cycles
Gas valves (solenoid)
10 years or 250,000
operation cycles
Pressure switches
10 years or 250,000
operation cycles
Pressure adjuster
15 years
Servomotor (electronic
cam) (if present)
10 years or 250,000
operation cycles
Oil valve (solenoid)(if
present)
10 years or 250,000
operation cycles
Oil regulator (if present)
10 years or 250,000
operation cycles
Oil pipes/ couplings
(metallic) (if present)
10 years
Flexible hoses (if present)
5 years or 30,000 pressurised
cycles
Fan impeller
10 years or 500,000 start-ups
