Baxi Duo-tec Combi HE A (24, 28, 33, 40 HE A)
Combi, natural gas
Combustion figures
| Figure | Natural gas (G20) |
|---|---|
CO₂ at high rate More infoHide infoMeasured at the flue adaptor test point in Calibration Mode, after running the boiler for several minutes (MI 15.1). The same figure is given in MI 13.1. | 8.7% ± 0.2 |
CO₂ at low rate More infoHide infoChecked after the maximum rate check, with the display reading 0 (MI 15.1). The same figure is given in MI 13.1. | 8.4% ± 0.2 |
Maximum CO | Not given in MI |
CO/CO₂ ratio More infoHide infoGiven in the annual servicing combustion check (MI 13.1). | Less than 0.004 |
O₂ | Not given in MI |
Working inlet pressure More infoHide infoMeasurement point not stated in MI. Technical data (MI 4.1) gives inlet pressure 20 mbar, commissioning (MI 11.2) says the gas supply pressure should be 20 mbar, and fault finding (MI 18.1) calls 20 mbar the preferred minimum. Fault finding chart I (MI p. 55) says to check the supply pressure is greater than 10–11 mbar. | 20 mbar |
Gas rate at maximum More infoHide infoNatural gas G20, after 10 minutes (MI 4.1). MI 11.2 gives the same figures as approximate values, with other appliances and pilot lights off. |
|
From UK Comp No 5122323 - Iss 7 - 5/09
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 |
|---|---|---|
| Duo-tec Combi 24 HE A | 47-075-35 | NG |
| Duo-tec Combi 28 HE A | 47-075-36 | NG |
| Duo-tec Combi 33 HE A | 47-075-37 | NG |
| Duo-tec Combi 40 HE A | 47-075-38 | NG |
Source: Baxi Duo-tec Combi HE A Range installation & servicing instructions, UK Comp No 5122323 - Iss 7 - 5/09.
Sections: 4.1 Technical data; 11.2 Checking; 13.1 Annual servicing; 15.1 Checking the CO2; 18.1 Initial fault finding checks; 18.0 Fault finding chart I.
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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.