Baxi Neta-tec Combi GA (24 GA, 28 GA, 33 GA)
Combi, natural gas and LPG
Not in the database yet:
- This PDF stops at MI p. 31, so MI section 14.0 Combustion & Calibration (MI p. 42) is missing: check it for CO₂ at high and low rate (MI section 14.0)
Combustion figures
| Figure | Natural gas (G20) | LPG (G31) |
|---|---|---|
CO₂ at high rate More infoHide infoThe MI gives one CO₂ figure in the technical data (section 4.1) without saying which rate, so it is shown in both rows. Rate not stated in MI. | 9.0% ± 0.7 | 10.5% ± 1.0 |
CO₂ at low rate More infoHide infoSame single technical data figure as the high rate row. Rate not stated in MI. | 9.0% ± 0.7 | 10.5% ± 1.0 |
Maximum CO More infoHide infoChecked at maximum and minimum rate (section 10.2 flowchart). | Under 350 ppm | Under 350 ppm |
CO/CO₂ ratio More infoHide infoChecked at maximum and minimum rate (section 10.2 flowchart). Section 12.1 also says the ratio at maximum must be less than 0.004. | Under 0.004 | Under 0.004 |
O₂ | Not given in MI | Not given in MI |
Working inlet pressure More infoHide infoSection 10.3 gives one figure for the inlet test point on the gas cock or valve, with the boiler at maximum (chimney sweep) and the system cold. The technical data gives an inlet pressure of 20 mbar (NG) and 37 mbar (LPG). |
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Gas rate at maximum More infoHide infoAfter 10 minutes, with other appliances and pilot lights off. |
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Flue integrity More infoHide infoAt the air inlet test point, boiler at maximum. | O₂ ≥ 20.6% CO₂ < 0.2% | O₂ ≥ 20.6% CO₂ < 0.2% |
From © Baxi Heating UK Ltd 2014 (document number not in this PDF)
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 |
|---|---|---|
| Baxi Neta-tec Combi 24 GA | 47-075-51 | Not stated |
| Baxi Neta-tec Combi 28 GA | 47-075-52 | Not stated |
| Baxi Neta-tec Combi 33 GA | 47-075-53 | Not stated |
Source: Baxi Neta-tec Combi GA Range Installation & Servicing Instructions, © Baxi Heating UK Ltd 2014 (document number not in this PDF).
Sections: 4.1 Technical Data; 10.1 Commissioning the Boiler; 10.2 Checking the Combustion - Chimney Sweep Function; 10.3 Check the Operational (Working) Gas Inlet Pressure & Gas Rate; 12.1 Performance Safety Check & Annual Servicing.
Spotted something wrong? Tell us.
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.