Baxi 800 Combi 2 (24, 30, 36)
Combi, natural gas and LPG
Combustion figures
| Figure | Natural gas (G20) | LPG (G31) |
|---|---|---|
CO₂ at high rate More infoHide infoNominal, with the range of tolerance in brackets. Front panel closed, chimney sweep mode at maximum. NG figures are for G20 only: for G20 with up to 20% hydrogen, set the gas valve by O₂ only. | 9.0% (8.8–9.4) |
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CO₂ at low rate More infoHide infoNominal, with the range of tolerance in brackets. Front panel closed, chimney sweep mode at minimum. | 8.5% (8.1–8.6) |
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Maximum CO More infoHide infoThe MI contradicts itself: the service settings table (7.4.4) gives CO max <400 ppm, but the combustion procedure chart (Fig.52) says CO must be under 350 ppm at maximum and minimum rate, or turn the appliance off. |
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CO/CO₂ ratio More infoHide infoChecked at maximum and minimum rate (Fig.52). | <0.004 | <0.004 |
O₂ at high rate More infoHide infoNominal, with the range of tolerance in brackets, printed high to low as in the MI. Front panel closed. For the LPG 36 the nominal 5.7% is printed at the top of its own range. | 4.8% (5.2–4.1) |
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O₂ at low rate More infoHide infoNominal, with the range of tolerance in brackets, printed high to low as in the MI. Front panel closed. | 5.7% (6.5–5.6) |
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Working inlet pressure More infoHide infoBoiler at maximum rate (chimney sweep). At the meter: 19–23 mbar (Fig.44, which doesn’t name the gas type). The text says the pressure at the gas inlet test point must be at least 18 mbar for NG or 37 mbar for LPG. Pressure drop across system pipework ≤ 1 mbar. Supply pressure in the gas category table: NG 20 mbar, LPG 37 mbar. |
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Gas rate at maximum More infoHide infoMeasured with any other appliances and pilot lights turned off (Tab.23). |
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Flue integrity More infoHide infoAt the air inlet test point, boiler at maximum rate. | O₂ ≥ 20.6% CO₂ < 0.2% | O₂ ≥ 20.6% CO₂ < 0.2% |
From 7821592 - 03 (4/23)
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 |
|---|---|---|
| 800 Combi 2 24 (824-2) | 47-077-63 | Not stated |
| 800 Combi 2 30 (830-2) | 47-077-64 | Not stated |
| 800 Combi 2 36 (836-2) | 47-077-65 | Not stated |
Source: Baxi 800 Combi 2 Installation and Service Manual & Boiler Fiche, 7821592 - 03 (4/23).
Sections: 3.1.2 Certifications; 3.1.3 Gas category; 3.2.1 Technical information (Tab.9 Combustion characteristics); 7.4.1 Checking the working gas inlet pressure and gas rate; 7.4.2 Combustion parameters (chimney sweep function, Fig.52 Combustion procedure); 7.4.3 LPG conversion procedure; 7.4.4 Service settings; 7.4.5 Adjusting the gas valve; 10.1 General.
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.