Glow-worm Compact combi (24c-AS/1, 28c-AS/1)
Combi, natural gas and LPG
Combustion figures
| Figure | Natural gas (G20) | LPG (G31) |
|---|---|---|
CO₂ at high rate More infoHide infoAt full load, check programme P.01, after at least 5 minutes. The MI contradicts itself on the case-on tolerance: section 9.6.5 (commissioning check) gives NG 9.2 ±1 % and LPG 10.6 ±0.5 %, while section 12.2 (checking and setting) gives ±0.3 for both gases. Case-off figures are from section 12.2 only, which says to set the CO₂ with the front casing removed. |
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CO₂ at low rate | Not given in MI | Not given in MI |
Maximum CO More infoHide infoAt full load, case on or off (MI 12.2). The Benchmark commissioning flow chart (Appendix H) uses CO less than 350 ppm as its pass level, and prints 335 ppm in one of its boxes. | ≤ 250 ppm | ≤ 250 ppm |
CO/CO₂ ratio More infoHide infoCase on or off (MI 12.2). The Benchmark commissioning flow chart (Appendix H) uses a ratio less than 0.004 as its pass level. | ≤ 0.0027 | ≤ 0.0024 |
O₂ at high rate More infoHide infoAt full load (MI 12.2). |
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O₂ at low rate | Not given in MI | Not given in MI |
Working inlet pressure More infoHide infoMeasured at the test nipple on the gas valve, with the boiler at maximum in check programme P.01 (MI 9.6.4). The MI adds that, because it is measured at the gas valve, the permissible minimum may be 1 mbar (0.1 kPa) lower than the figure shown. Technical data gives the gas connection pressure as 20.0 mbar (NG) and 37.0 mbar (LPG). |
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Gas rate at maximum More infoHide infoMeasured at the gas meter, case on, after at least 5 minutes in check programme P.01, for the maximum Qnw on the data plate (24 kW and 28 kW) (MI 9.6.3). The technical data (MI section 3) gives slightly different maximum gas flows for hot water: G20 2.54 m³/h (24c) and 2.96 m³/h (28c); G31 1.86 kg/h (24c) and 2.18 kg/h (28c). |
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Flue integrity More infoHide infoAt the air inlet test point, boiler at maximum rate (Benchmark commissioning flow chart, Appendix H). Section 9.6.2 says to check for flue gas recirculation at the air analysis point on extended flues, but gives no figures. | O₂ ≥ 20.6% CO₂ < 0.2% | O₂ ≥ 20.6% CO₂ < 0.2% |
From 0020313973_01 (05.02.2021)
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 |
|---|---|---|
| Compact 24c-AS/1 (H-GB) | 47-019-63 | NG |
| Compact 28c-AS/1 (H-GB) | 47-019-64 | NG |
| Compact 24c-AS/1 (P-GB) | 47-019-65 | LPG |
| Compact 28c-AS/1 (P-GB) | 47-019-66 | LPG |
Source: Glow-worm Compact 24c-AS/1, 28c-AS/1 installation and maintenance instructions, 0020313973_01 (05.02.2021).
Sections: 3 Technical data; 4 Notes on the documentation; 9.6.2 Checking the air/flue pipe/flue gas recirculation; 9.6.3 Checking the gas flow rate; 9.6.4 Checking the gas connection pressure/gas flow pressure; 9.6.5 Checking the CO₂ content; 12.2 Checking and setting the CO₂ content; Appendix E Check programmes; Appendix H Commissioning Flow Chart.
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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.