Combustion Control (Gas); Safety Components - Riello GAS 8 P/M Installation, Use And Maintenance Instructions

Combustion
Carry out an analysis of the combustion flue gases.
Significant differences with respect to the previous measure-
ments 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 effi-
cient combustion, consult the table below or contact our Techni-
cal Support Service to implement the necessary adjustments.
EN 676
Max. output
Theoretical max
CO
GAS
2
0 % O
2
G 20 11.7
G 25 11.5
7.2.4

Combustion control (gas)

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 subse-
quent formation of CO.
CO
It should not exceed 100 mg/kWh.
Flame presence check
Check the level of the flame detection signal with the "Check
mode" function from the flame control: the LEDs from 2 to 6
indicate the flame signal level, respectively. See paragraph "LED
indicator and special function" on page 39
Check Mode
With burner flame on:
 hold the reset button on the flame control pressed for at
least 3 sec.;
 the button colour will change from green to yellow;
 each operating status signalling LED will be compared to
20% of the maximum brightness;
 press the reset button again (<0.5sec) to reset the standard
operation of the signalling LEDs.
Air excess
Max. output
  1.2   1.3
CO % Calibration
2
mg/kWh
 = 1.3
 = 1.2
9.7 9
9.5 8.8
not greater than
2
Maintenance
7.2.5

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 warran-
ty terms indicated in the delivery or payment con-
ditions.
WARNING
Safety component
Flame control
CO
Flame sensor
Gas valves (solenoid)
 100
Pressure switches
 100
Pressure adjuster
Tab. I
Servomotor (electronic
cam)(if any)
Oil valve (solenoid) (if any)
Oil regulator (if present)
Oil pipes/ couplings (metal-
lic) (if present)
Flexible hoses (if present)
Fan impeller
37 GB
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 cy-
cles
10 years or 500.000 start-ups
20148758
Tab. J