Vaillant ecoTEC pro combi (30 H combi A, VUW 306/5-3)
Combi, natural gas (LPG figures given)
Combustion figures
| Figure | Natural gas (G20) | LPG (G31) |
|---|---|---|
CO₂ at high rate More infoHide infoAfter 5 minutes in full load mode (check programme P.01), measured at the flue gas analysis point. If adjustment is needed, set CO₂ to the case-off value. |
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CO₂ at low rate | Not given in MI | Not given in MI |
Maximum CO More infoHide infoAt full load. The Benchmark commissioning flow chart in the appendix uses a different check: CO less than 350 ppm at maximum and minimum rate (one box says 335 ppm). | ≤ 250 ppm | ≤ 250 ppm |
CO/CO₂ ratio More infoHide infoThe Benchmark commissioning flow chart in the appendix uses a ratio less than 0.004 at maximum and minimum rate. | ≤ 0.0031 | ≤ 0.0026 |
O₂ at high rate More infoHide infoAfter 5 minutes in full load mode with the front casing closed. | 4.5% ± 1.8 | 5.1% ± 0.8 |
O₂ at low rate | Not given in MI | Not given in MI |
Working inlet pressure More infoHide infoMeasured at the test nipple (lower screw) on the gas valve, at full load (check programme P.01). Technical data gives the gas flow pressure as NG 20.0 mbar, LPG 37.0 mbar. |
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Gas rate at maximum More infoHide infoFrom the technical data (at 15 °C and 1013 mbar, based on hot water). The gas flow rate check table in section 9.11.3 lists outputs of 18.5 to 27.2 kW only, with no row matching this model’s 30.0 kW hot water output. | 3.2 m³/h | 2.4 kg/h |
Flue integrity More infoHide infoAt the air inlet test point, boiler at maximum rate (Benchmark commissioning flow chart). | O₂ ≥ 20.6% CO₂ < 0.2% | O₂ ≥ 20.6% CO₂ < 0.2% |
From 0020209589_04 (29.07.2020)
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 |
|---|---|---|
| ecoTEC pro 30 H combi A VUW 306/5-3 | 47-044-52 | NG |
Source: Vaillant ecoTEC pro VUW ..6/5-3 installation and maintenance instructions, 0020209589_04 (29.07.2020).
Sections: 3 Technical data; 4 Notes on the documentation (Gas Council number); 9.11.1 Checking the factory-set gas setting; 9.11.3 Checking the gas flow rate; 9.11.4 Checking the gas flow pressure; 9.11.5 Checking the CO₂ content and adjusting it (air index setting); E Check programmes; H Commissioning flow chart.
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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.