Glow-worm Essential combi (24c, 28c)
Combi, natural gas
Combustion figures
| Figure | Natural gas (G20) |
|---|---|
CO₂ at high rate More infoHide infoCheck programme P.01 set to 100 (full load), reading taken once stable (about 5 minutes). The checking table (MI 7.9.4 and 11.3) gives 9.2 ±1 % and applies with the front casing removed or installed. If out of range, the setting table (MI 11.4) gives CO₂ at full load 9.2 ±0.2 %, set with the front casing removed (MI 11.4 step text); the setting table’s own column header says front casing removed or installed. |
|
CO₂ at low rate | Not given in MI |
Maximum CO More infoHide infoThe MI gives two limits. The setting table (MI 11.4) gives CO at full load ≤ 250 ppm. The combustion chart (MI appendix I) gives CO less than 350 ppm at maximum and minimum rate, and less than 335 ppm in the re-check after checking the seals. |
|
CO/CO₂ ratio More infoHide infoThe MI gives two limits. The setting table (MI 11.4) gives ≤ 0.0027 at full load; the combustion chart (MI appendix I) gives less than 0.004 at maximum and minimum rate. |
|
O₂ at high rate More infoHide infoO₂ at full load, from the setting table (MI 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). The MI prints it as 1.7 ... 2 kPa (17.0 ... 20 mbar). Technical data gives the G20 gas supply pressure as 20 mbar. |
|
Gas rate at maximum More infoHide infoGas flow at P max., hot water (G20), from the technical data. |
|
Flue integrity More infoHide infoAt the air inlet test point, boiler at maximum rate (combustion chart, MI appendix I). | O₂ ≥ 20.6% CO₂ < 0.2% |
From 0020206373_04 – 10.09.2019
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 |
|---|---|---|
| Essential 24c | 47-019-27 | NG |
| Essential 28c | 47-019-28 | NG |
Source: Installation and maintenance instructions Essential 24c, 28c, 0020206373_04 – 10.09.2019.
Sections: 2.3 Applicability of the instructions; 7.9.1 Checking the gas connection pressure (gas flow pressure); 7.9.2 Checking the leak-tightness of the flue gas system and for flue gas recirculation; 7.9.4 Checking the CO₂ content; 11.3 Checking the CO₂ content; 11.4 Setting the CO₂ content; A Check programmes – Overview; I Combustion chart; K 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.