20093868
60
GB
Maintenance
Combustion
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 Assis-
tant in order to carry out the necessary adjustments.
Tab. Q
7.2.3
Measuring circuit for detector current
measurement
The minimum current necessary for the control box operation is
1 µA. The burner normally supplies a higher current value, so that
no check is needed.
Anyway, if you want to measure the ionisation current, you need to
open the connector (CN1) fitted on the red wire and insert a mi-
croammeter.
Check of signal flame
Display value:
MIN
1 µA
= 20%
MAX
40 µA = 100%
Key (Fig. 171)
C
Electrolytic condenser 100...470 µF; DC 10...25 V
ION
Ionization probe
M
Microammeter Ri max. 5,000
7.3
Safety components
The safety components must be replaced according to the limit of
the lifetime cycles indicated in the Tab. R.
The lifetime cycles specified, are not referred to the warranty time
indicated in the delivery and payment conditions.
Tab. R
NOx expected emissions on natural gas (expressed in ppm@3% O
2
)
Sub 30
Sub 20
Sub 9
CO
2
(%)
O
2
(%)
CO
2
(%)
O
2
(%)
CO
2
(%)
O
2
(%)
8.5 ~ 8.75
5.8 ~ 5.4
8.0 ~ 8.5
6.7 ~ 5.8
7.25 ~ 7.75
8.0 ~ 7.1
WARNING
Simultaneous operation of QRA... and ionization
probe is not permitted!
If not observed, there is a risk of impairment of safe-
ty functions.
WARNING
This display is only possible in operating mode or
standby!
LME7...
M
C
ION
X10-05/2
X10-05/1
Fig. 171
S8615
Safety component
Lifetime cycle
Control box
10 years or 250,000 operating cycles
Flame sensor
10 years or 250,000 operating cycles
Solenoid valves
10 years or 250,000 operating cycles
Pressure switches
10 years or 250,000 operating cycles
Gas pressure regulator
15 years
Servomotors (electronic cam)
10 years or 250,000 operating cycles
Solenoid oil valves
10 years or 250,000 operating cycles
Oil regulator
10 years or 250,000 operating cycles
Fuel pipes/ connectors (metallic)
10 years
Hoses
5 years or 30,000 pressure cycles
Fan wheel
10 years or 500,000 startings
