5.4.3.
Setting the air/gas ratio (Part load)
1. Unscrew the plug of the flue gas measurement point.
2. Connect the flue gas analyser.
WARNING
Ensure that the opening around the sensor is completely
sealed when taking measurements.
3. Set the boiler to part load. Press the two
B
keys
simultaneously. The symbol
B
appears. Press the
[-]
key several
times until
l3
is displayed on the screen.
4. Measure the percentage of O
2
or CO
2
in the flue gases (Front
panel removed).
5. If this rate does not match the required value, correct the gas/air
ratio using the adjustment screw
B
on the gas valve unit.
4
Turn the screw
B
anticlockwise to obtain a lower
CO
2
value.
4
Turn the screw
B
clockwise to obtain a higher CO
2
value.
6. Check the flame through the flame inspection window.
The flame must be stable and blue in colour with orange
particles around the edge of the burner.
O
2
/CO
2
control and setting values at part load for G20 (Gas H)
Boiler type
Setting value
Checking value
O
2
(%)
CO
2
(%)
O
2
(%)
CO
2
(%)
Calenta 25s
5,9 ± 0,4
8,4 ± 0,2
5,9 ± 0,4
8,4 ± 0,2
Calenta 28c
5,9 ± 0,4
8,4 ± 0,2
5,9 ± 0,4
8,4 ± 0,2
Calenta 35s
5,5 ± 0,4
8,6 ± 0,2
5,5 ± 0,4
8,6 ± 0,2
Calenta 40c
5,5 ± 0,4
8,6 ± 0,2
5,5 ± 0,4
8,6 ± 0,2
O
2
/CO
2
control and setting values at part load for G25 (Gas L)
Boiler type
Setting value
Checking value
O
2
(%)
CO
2
(%)
O
2
(%)
CO
2
(%)
Calenta 25s
5,7 ± 0,4
8,4 ± 0,2
5,7 ± 0,4
8,4 ± 0,2
Calenta 28c
5,7 ± 0,4
8,4 ± 0,2
5,7 ± 0,4
8,4 ± 0,2
Calenta 35s
5,2 ± 0,4
8,7 ± 0,2
5,2 ± 0,4
8,7 ± 0,2
Calenta 40c
5,2 ± 0,4
8,7 ± 0,2
5,2 ± 0,4
8,7 ± 0,2
T001526-A
T001587-A
rpm
kWµA
± 30
l/min
bar
Psi
St
ºC
ºCºFh
B
T000933-B
B
Calenta 25s - 28c - 35s - 40c
5. Commissioning
040412 - 7600585-01
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