52
ENGLISH
TECHNICAL ASSISTANCE SERVICE
Checking combustion parameters
Proceed as follows to perform combustion analysis:
- Pull off the function selector knob (7) from the control
panel and press the combustion analysis button
- Remove the screw (A) and the combustion analysis cap
(40) and insert the combustion analysis probe into the
air box
- Check that the values for CO
2
corrispondano a quelli
indicati in tabella. Se il valore visualizzato è differente
procedere alla modifica come indicato nel capitolo
“Taratura valvola gas”
- Repeat combustion analysis.
Then:
- Remove the combustion analysis probes and fit the cap
back over the hole with the screw.
- Fit the function selector knob back on the control panel.
b
When inserting the combustion analysis probe, take
care to push it all the way in.
IMPORTANT
The safety function that shuts down the boiler if central
heating water reaches 85°C remains active even during
combustion analysis
Autodiagnosis of primary heat
exchanger cleaning
The boiler incorporates an autodiagnosis system that
uses the number of hours of operation under certain con-
ditions to notify the user that the primary heat exchanger
needs cleaning (error code 91).
Clean the heat exchanger using the relevant accessory
kit, then proceed as follows to reset the hour counter.
- Switch off electrical power.
- Pull off the function selector knob.
- Hold down the combustion analysis button (C) for at
least 4 seconds while switching electrical power back
on again.
To check that the hour counter has reset properly, switch
power to the boiler off and back on again: after all the
segments of the digital display have lit up, the display
reads out the hour count.
NOTE! Reset the hour counter every time you thoroughly
clean or replace the primary heat exchanger.
To ascertain the actual number of hours of boiler oper-
ation, multiply the value displayed by 100 (e.g. value
displayed 18 = 1800 hours operation; value displayed 1=
100 hours operation).
C
40
20
40 60 80
100
4
3 2 1
0
0
120
3
7
20
40 60 80
100
4
3 2 1
0
0
120
Max CH
Temp. curves
Combustion analysis
Burner ignition
slow fan speed
Min
Max
20
40 60 80
100
4
3 2 1
0
0
120
Combustion analysis
Min
Max
C
