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5. Commissioning
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 combustion
analyzer probe is completely sealed when taking
measurements.
3. Set the boiler to part load. Press the [-] key several
times until l3 is displayed on the screen.
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 (B).
Control and setting values O
Boiler type
Setting value
O
(%)
2
MCA Pro 45
5.6/5.9
MCA Pro 65
5.6/5.9
MCA Pro 90
5.6/5.9
MCA Pro 115
5.4/5.7
Control and setting values O
Boiler type
Setting value
O
(%)
2
MCA Pro 45
5.2/5.5
MCA Pro 65
5.2/5.5
MCA Pro 90
Propane not available
MCA Pro 115
6.3/6.6
70
or CO
in the flue
2
2
/CO
at part load for natural gas
2
2
Checking value
CO
(%)
O
(%)
CO
2
2
8.4/8.6
5.4/6.1
8.3/8.7
8.4/8.6
5.4/6.1
8.3/8.7
8.4-8.6
5.4/6.1
8.3/8.7
8.5/8.7
5.2/5.9
8.4/8.8
/CO
at part load for propane
2
2
Checking value
CO
(%)
O
(%)
CO
2
2
10.1/10.3
5.1/5.7
10.0/10.4
10.1/10.3
5.1/5.7
10.0/10.4
9.4/9.6
6.1/6.7
9.3/9.7
(%)
2
(%)
2
MCA Pro 45/65/90/115
MCA-Pro ISM Rv.4.1 2/2017
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