Baxi MainEco Combi (24, 28, 35)
Combi, natural gas
Combustion figures
| Figure | Natural gas (G20) |
|---|---|
CO₂ at high rate More infoHide infoFront panel removed. Set and checked at full load and part load (MI 6.4.2, 6.4.3). The MI also says the full load value must be 0.4% higher than the part load value, which the two printed ranges do not always give (e.g. 9.15% and 9.05%). Analyser accuracy at least ±0.25% CO₂. | Between 9.15 and 9.50% |
CO₂ at low rate More infoHide infoFront panel removed (MI 6.4.2, 6.4.3). | Between 8.70 and 9.05% |
Maximum CO More infoHide infoAt maximum and minimum rate, probe in the flue gas test point, after the flue integrity check (MI 6.4.2 flowchart). | < 350 ppm |
CO/CO₂ ratio More infoHide infoAt maximum and minimum rate (MI 6.4.2 flowchart). | < 0.004 |
O₂ | Not given in MI |
Working inlet pressure More infoHide infoGas inlet pressure G20, min to max; connecting pressure G20 20 mbar (MI 4.6). Measurement point not stated in MI. MI 6.4.1 says to check the supply pressure at test point C on the gas inlet pipe against the rating plate. | 17–23 mbar |
Gas rate at maximum More infoHide infoGas consumption G20, max (MI 4.6). |
|
Flue integrity More infoHide infoAt the air inlet test point, boiler at maximum rate (MI 6.4.2 flowchart). | O₂ ≥ 20.6% CO₂ < 0.2% |
From 02092014 - 7619497-02
Enter service mode for high and low rate
High rate
Steps not added yet. Follow the MI.
Low rate
Steps not added yet. Follow the MI.
Ending the test: follow the MI.
Models and GC numbers
| Model | GC number | Gas |
|---|---|---|
| MainEco Combi 24 | 47-075-93 | NG |
| MainEco Combi 28 | 47-075-94 | NG |
| MainEco Combi 35 | 47-075-95 | NG |
Source: Baxi MainEco Combi and System 24-28-35 / 18-24 Installation and Service Manual, 02092014 - 7619497-02.
Sections: 2.4.1 Certifications; 4.6 Technical specifications; 6.4.1 Gas circuit; 6.4.2 Checking combustion; 6.4.3 Setting the air/gas ratio; 8.2.7 Checking combustion.
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Check these figures against the MI for the appliance in front of you, matched by GC number and manual date. Combustion work needs a calibrated analyser and a Gas Safe registered engineer.