Riello GAS Series - Combustion Control (Gas); Safety Components

2915858
26
GB
Maintenance
Combustion
The optimum calibration of the burner requires an analysis of the
flue gases.
Significant differences with respect to the previous measure-
ments indicate the points where more care should be exercised
during maintenance.
In case the combustion values found at the beginning of the inter-
vention do not respect the standards in force or, in any case, do
not correspond to a proper combustion, contact the Technical As-
sistance Centre in order to carry out the necessary adjustments.
7.2.4 Ionisation current
The minimum current necessary for the control box operation is
3 µA.
The burner normally supplies a higher current value, so that no
check is needed.
However, if a measurement of the ionization current is required,
it is necessary to disconnect the probe lead and insert a d.c. mi-
croamperometer.
7.2.5 Combustion control (gas)
CO
2
It is advisable to adjust the burner with a CO
2
not greater than
about 10% (gas con 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 subse-
quent formation of CO.
CO
It should not exceed 100 mg/kWh.
Tab. L
7.2.6 Safety components
The safety components should be replaced at the end of their life
cycle indicated in the following table.
The specified life cycles do not refer to the warranty terms indi-
cated in the delivery or payment conditions.
Tab. M
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  100
G 25 11.5 9.5 8.8  100
G 30 14.0 11.6 10.7  100
G 31 13.7 11.4 10.5  100
Fig. 25
S10240
LEAD PROBE
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