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5. Commissioning
5.4.2. Setting the air/gas ratio (Full load)
1. Unscrew the plug of the flue gas measurement
point.
2
Connect the flue gas analyser.
WARNING
Ensure that the opening around the combustion
analyzer probe is completely sealed when taking
measurements.
3. Set the boiler to full load. Press the two
simultaneously. The display shows h3. The symbol
appears.
4. Measure the percentage of O
gases.
5. Compare the values measured with the checking
values given in the table (Front panel removed).
6. If necessary, adjust the gas/air ratio using the
adjusting screw (A).
Control and setting values O2/CO
Boiler type
Setting value
O 2 (%)
MCA Pro 45
4.7/5.0
MCA Pro 65
4.7/5.0
MCA Pro 90
4.7/5.0
MCA Pro 115
4.5/4.8
Control and setting values O
2
Boiler type
Setting value
O 2 (%)
MCA Pro 45
4.4/4.8
MCA Pro 65
4.4/4.8
MCA Pro 90
Propane not available
MCA Pro 115
4.8/5.1
St
ºC
MCA-Pro ISM Rv.4.1 2/2017
or CO
in the flue
2
2
at full load natural gas
2
Checking value
CO
(%)
O
(%)
CO
2
2
8.9/9.1
4.5/5.1
8.8/9.2
8.9/9.1
4.5/5.1
8.8/9.2
8.9/9.1
4.5/5.1
8.8/9.2
9.0/9.2
4.3/5.0
8.9/9.3
/CO
at full load for propane
2
Checking value
CO
(%)
O
(%)
CO
2
2
10.6/10.8
4.3/4.9
10.5/10.9
10.6/10.8
4.3/4.9
10.5/10.9
10.4/10.6
4.6/5.2
10.3-10.7
ºCºFh
barPsi
rpm
kWµA
l/min
± 30
buttons
(%)
2
(%)
2
MCA Pro 45/65/90/115
A
A
69
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