7. Unscrew the left-hand plug, which corresponds to the flue gas
measurement point connection.
8. Connect the flue gas analyser to the connection on the left.
Important
Ensure that the opening around the sensor is completely sealed
when taking measurements.
IX 145–50 and IX 145–70: Insert the sensor into the flue gas
measurement point to at least 8 cm.
IX 145–90 and IX 145–110: Insert the sensor into the flue gas
measurement point to at least 9 cm.
9. Set the boiler's heat input to 0%.
10. Measure the percentage of CO
2
in the flue gases.
11. Compare the values measured with the authorised CO
2
range in the
Control and setting values table.
Important
The CO
2
settings range at reduced heat input depends on the
CO
2
value measured at maximum heat input.
12. If necessary, adjust the air/gas ratio using the OFFSET adjustment
screw.
Important
Turn the gas adjustment screw clockwise to increase the CO
2
content.
Turn the gas adjustment screw counter-clockwise to reduce the
CO
2
content.
Caution
Be sure to correctly replace the plug after taking a measurement.
For more information, see
Check-list before commissioning, page 59
Gas valve basic settings, page 64
CO2 checking and setting values, page 65
Using the fixed-speed boiler, page 91
Checking combustion (reduced heat input), page 108
8.4.4
Gas valve basic settings
Tab.37 Settings values for a new gas valve
Boiler model
Nominal heat input:
Number of turns for the gas flow rate set
tings screw
Minimum heat input:
Number of turns for the OFFSET set
tings screw
IX 145–50
12
5 + 3/4
IX 145–70
13
5 + 3/4
IX 145–90
2 + 2/3
5 + 3/4
IX 145–110
2 + 1/3
5 + 3/4
Fig.65
Connecting the flue gas analyser
MW-3000046-03
2
1
8 Commissioning
64
IX
7702703 - v04 - 05092019
Содержание IX 145-110
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