Vaillant ecoTEC pro combi (VUW GB 246/5-3 A, 286/5-3 A, 286/5-3 A LPG, 306/5-3)
Combi, natural gas and LPG
Matched 30 (VUW GB 306/5-3) ecoTEC pro (GC 47-044-52)
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. Adjust to the front casing removed figure. |
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CO₂ at low rate | Not given in MI | Not given in MI |
Maximum CO More infoHide infoCO value with full load. The CO and combustion ratio flowchart in the appendix uses CO less than 350 ppm and CO/CO₂ ratio less than 0.004 at max. and min. rate as its pass level (one box in it prints 335ppm). | ≤ 250 ppm | ≤ 250 ppm |
CO/CO₂ ratio More infoHide infoFrom the full load table in MI 7.11.5. The appendix flowchart uses less than 0.004 at max. and min. 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 infoAt the measuring nipple on the gas valve, boiler at full load (P.01). Technical data gives a nominal gas flow pressure of 20.0 mbar (G20) and 37.0 mbar (G31). |
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Gas rate at maximum More infoHide infoNominal values from the gas flow rate table (MI 7.11.3), measured at the meter after 5 minutes on P.01. Allowed range +5% to −10%: NG 24: 2.74 to 2.35, 28: 3.26 to 2.79, 30: 3.43 to 2.94 m³/h; LPG 24: 2.02 to 1.73, 28: 2.36 to 2.03, 30: 2.52 to 2.16 kg/h. The technical data table gives different G20 figures: 2.5, 2.9 and 3.2 m³/h, and G31 figures of 1.9, 2.2 and 2.4 kg/h. |
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Flue integrity More infoHide infoAt the air inlet test point, boiler at maximum rate (appendix flowchart). | O₂ ≥ 20.6% CO₂ < 0.2% | O₂ ≥ 20.6% CO₂ < 0.2% |
From 0020209589_01 (04.09.2015)
Enter service mode for high and low rate
High rate
Low rate
Models and GC numbers
| Model | GC number | Gas |
|---|---|---|
| 24 (VUW GB 246/5-3 A) ecoTEC pro | 47-044-54 | NG |
| 28 (VUW GB 286/5-3 A) ecoTEC pro | 47-044-55 | NG |
| 28 (VUW GB 286/5-3 A LPG) ecoTEC pro | 47-044-56 | LPG |
| 30 (VUW GB 306/5-3) ecoTEC pro | 47-044-52 | NG |
Source: ecoTEC pro VUW installation and maintenance instructions, 0020209589_01 (04.09.2015).
Sections: 2.3 Applicability of the instructions; 7.3 Using check programmes; 7.11.2 Checking the leak-tightness of the flue gas system; 7.11.3 Checking the gas flow rate; 7.11.4 Checking the gas flow pressure; 7.11.5 Checking the CO₂ content and adjusting it; F Commissioning checklist (CO and combustion ratio flowchart); J Technical data.
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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.