Vaillant ecoFIT pure 612–630 system (VU 126/6-3, 156/6-3, 186/6-3, 256/6-3, 306/6-3)
System boiler, natural gas
Combustion figures
| Figure | Natural gas (G20) |
|---|---|
CO₂ at high rate More infoHide infoAt the flue gas analysis point with check programme P.01 (maximum load), read when stable (about 5 minutes). Both tables are headed Removed front casing/installed front casing. Checking figure from MI 7.11.4 and 11.4; setting figure is CO₂ at full load from MI 11.5, set with the front casing removed. At commissioning (7.11.4) a check value outside the range means don’t start up and inform Customer Service; at a service (11.4) it means set the CO₂. |
|
CO₂ at low rate | Not given in MI |
Maximum CO More infoHide infoFull load figure from the Setting the CO₂ value table (MI 11.5). The commissioning flowchart in the appendix (MI p. 43) uses CO under 350 ppm and CO/CO₂ ratio under 0.004 at maximum and minimum rate (under 335 ppm after the seals have been checked). The MI doesn’t say which applies, so both are shown. |
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CO/CO₂ ratio More infoHide infoFull load figure from MI 11.5. The 0.004 limit is from the commissioning flowchart (MI p. 43). The MI doesn’t say which applies, so both are shown. |
|
O₂ at high rate More infoHide infoO₂ at full load from MI 11.5 (printed as vol. %). | 4.5% ± 1.8 |
O₂ at low rate | Not given in MI |
Working inlet pressure More infoHide infoAt the measuring nipple on the gas isolator cock, with the boiler at full load and all other gas appliances working (MI 7.11.1). Technical data gives a G20 gas supply pressure of 20.0 mbar. If the pressure is outside the range, don’t adjust or start up the boiler. |
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Gas rate at maximum More infoHide infoGas flow at P max. (G20) from the technical data (MI Appendix I). To check at the gas meter (MI 7.10): check programme P.01, front casing fitted, wait at least 5 minutes, all other gas appliances off, then compare with the table by Qnw from the data plate (nominal, +5%, −10%, m³/h): 15.3 kW 1.62, 1.70, 1.46; 18.4 kW 1.95, 2.05, 1.76; 24.7 kW 2.61, 2.74, 2.35; 25.7 kW 2.72, 2.86, 2.45; 28.6 kW 3.03, 3.18, 2.73; 30.6 kW 3.24, 3.40, 2.92; 35.7 kW 3.78, 3.97, 3.40. |
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Flue integrity More infoHide infoAt the air inlet test point (supply air measuring stub), boiler at maximum rate (commissioning flowchart, MI p. 43; MI 7.11.2). | O₂ ≥ 20.6% CO₂ < 0.2% |
From 0020230533_01 (25.10.2016)
Enter service mode for high and low rate
High rate
Low rate
Models and GC numbers
| Model | GC number | Gas |
|---|---|---|
| VU 126/6-3 (H-GB) | 41-694-03 | NG |
| VU 156/6-3 (H-GB) | 41-694-04 | NG |
| VU 186/6-3 (H-GB) | 41-694-05 | NG |
| VU 256/6-3 (H-GB) | 41-694-06 | NG |
| VU 306/6-3 (H-GB) | 41-694-07 | NG |
Source: Vaillant ecoFIT pure 612 - 630 installation and maintenance instructions, 0020230533_01 (25.10.2016).
Sections: 2.3 Validity of the instructions; 6.5 Using check programmes; 7.3 Checking the factory setting; 7.10 Checking the gas flow rate; 7.11.1 Checking the gas connection pressure; 7.11.2 Checking the leak-tightness of the flue gas installation and flue gas recirculation; 7.11.4 Checking the CO₂ content; 11.4 Checking the CO₂ content; 11.5 Setting the CO₂ content; Appendix H Commissioning Checklist (flowchart); Appendix I 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.