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
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. |
|
|
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). |
|
|
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. |
|
|
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
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 |
|---|---|---|
| 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.
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.