Baxi Baxi 800 Combi (825, 830, 836)
Combi, natural gas
Combustion figures
| Figure | Natural gas (G20) |
|---|---|
CO₂ at high rate More infoHide infoPrinted as 9.0 + 0.3 – 0.2 (% maximum), the same for all three sizes, in Tab.23 and in Setting the gas valve (MI 9.3.12). Case front panel fitted. Set in calibration mode, display 100. | 9.0% + 0.3 – 0.2 |
CO₂ at low rate More infoHide infoPrinted as 8.5 + 0.1 – 0.4 (% minimum), the same for all three sizes, in Tab.23 and in Setting the gas valve (MI 9.3.12). Display 0 at minimum rate. | 8.5% + 0.1 – 0.4 |
Maximum CO More infoHide infoChecked at both maximum and minimum rate (MI Fig.47 Combustion procedure). | < 350 ppm |
CO/CO₂ ratio More infoHide infoChecked at both maximum and minimum rate (MI Fig.47). MI 9.1 and 9.3.12 also say it must be less than 0.004. | < 0.004 |
O₂ More infoHide infoThe MI gives O₂ only for the flue integrity check at the air inlet test point (see Flue integrity). | Not given in MI |
Working inlet pressure More infoHide infoFrom MI Fig.43. At the meter: 19–23 mbar. MI 7.4.1: with the boiler at maximum rate, the working pressure at the gas inlet test point (A) must be at least 18 mbar. Fault finding (MI Fig.73) gives a minimum of 17 mbar at the gas valve. |
|
Gas rate at maximum More infoHide infoNatural gas (G20), with all other appliances and pilot lights off (MI 7.4.1 Tab.22; also Tab.8). |
|
Flue integrity More infoHide infoAt the air inlet test point, boiler at maximum rate (MI Fig.47 and 9.1). | O₂ ≥ 20.6% CO₂ < 0.2% |
From 7728205-01
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 800 Combi 825 | 47-077-38 | NG |
| Baxi 800 Combi 830 | 47-077-39 | NG |
| Baxi 800 Combi 836 | 47-077-40 | NG |
Source: Baxi Combi 825 - 830 - 836 Installation and Service Manual (High Efficiency Wall Hung Condensing Gas Boiler), 7728205-01.
Sections: 3.2 Technical data; 7.4.1 Check the operational (working) gas inlet pressure and gas rate; 7.4.2 Checking combustion - chimney sweep mode (Fig.46, Fig.47 Combustion procedure); 9.1 General; 9.3.12 Gas valve (Setting the gas valve); 10.2.4 Fault finding solutions sections F to H.
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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.