Glow-worm Ultimate 3 system (25s)
System boiler, natural gas
Combustion figures
| Figure | Natural gas (G20) |
|---|---|
CO₂ at high rate More infoHide infoCheck programme P.01 set to 100, wait 5 minutes for a stable reading, measured at the flue gas analysis point. The MI gives two tolerances: ±1 % in the Checking the CO₂ content tables (7.9.5 and 11.3), and ±0.2 % in the Setting the CO₂ value table (11.4), which also says CO₂ at full load. The tables are headed Removed front casing/installed front casing, but 11.4 says to set the value with the front casing removed. |
|
CO₂ at low rate | Not given in MI |
Maximum CO More infoHide infoThe setting table (11.4) gives CO at full load ≤ 250 ppm. The combustion chart (Appendix I) gives CO less than 350 ppm at both maximum and minimum rate, and less than 335 ppm on the recheck after checking the seals. Both are printed in the MI. |
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CO/CO₂ ratio More infoHide infoThe setting table (11.4) gives ≤ 0.0027 at full load. The combustion chart (Appendix I) gives less than 0.004 at both maximum and minimum rate. |
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O₂ at high rate More infoHide infoO₂ at full load, from the Setting the CO₂ value table (11.4). | 4.5 ±1.8 vol. % |
O₂ at low rate | Not given in MI |
Working inlet pressure More infoHide infoMeasured at the measuring nipple on the gas isolator cock with the boiler at full load (check programme P.01, or P.03 without an eBUS controller). Technical data gives G20 gas supply pressure as 20 mbar. |
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Gas rate at maximum More infoHide infoHot water maximum (Q max. hot water 30.6 kW). Technical data gives gas flow at P max. hot water (G20) as 3.2 m³/h; the 7.9.1 table gives 3.24 m³/h nominal for Qnw 30.6. Measured at the gas meter with check programme P.01, front casing fitted, after at least 5 minutes, with all other gas appliances off. |
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Flue integrity More infoHide infoAt the air analysis (air inlet) point with the boiler at maximum rate, from the combustion chart (Appendix I) and 7.9.3. | O₂ ≥ 20.6% CO₂ < 0.2% |
From 0020239564_01 – 10.10.2016
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 |
|---|---|---|
| Ultimate 3 25s | 41-019-51 | NG |
Source: Glow-worm Ultimate 3 25s installation and maintenance instructions, 0020239564_01 – 10.10.2016.
Sections: 2.3 Applicability of the instructions; 7.9.1 Checking the gas flow rate; 7.9.2 Checking the gas connection pressure; 7.9.3 Checking the leak-tightness of the flue gas installation; 7.9.5 Checking the CO2 content; 11.3 Checking the CO2 content; 11.4 Setting the CO2 content; A Check programmes; I Combustion chart; K 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.