Glow-worm Betacom2 combi (24, 28)
Combi, natural gas and LPG
Combustion figures
| Figure | Natural gas (G20) | LPG (G31) |
|---|---|---|
CO₂ at high rate More infoHide infoSame for both sizes. Technical data gives these at Qmax DHW; section 17.3.3 checks at maximum (test mode P.01 set to HI), reading after about 5 minutes. Check with the case on, set with the case off (17.3.3 prints the NG setting as 9 ± 0.2%). The table in section 15.1.2 (gas conversion) gives the case on and case off figures the other way round: NG case on 9 ± 0.2%, case off 9.2 ± 0.3%; LPG case on 10.1 ± 0.2%, case off 10.3 ± 0.3%. |
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CO₂ at low rate More infoHide infoSame for both sizes. Given at Qmin in the technical data only; the servicing section has no low rate check. |
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Maximum CO | Not given in MI | Not given in MI |
CO/CO₂ ratio More infoHide infoSame for both sizes. Must not exceed this value (section 17.3). | 0.004 | 0.004 |
O₂ | Not given in MI | Not given in MI |
Working inlet pressure More infoHide infoNominal supply pressure at the gas service isolation valve test point, with all other gas appliances operating (section 11.6.1). MI gives no range. MI also says the safe nominal maximum heat input can be achieved at an inlet pressure down to 15 mbar, without saying which gas. |
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Gas rate at maximum More infoHide infoApproximate, after 10 minutes from cold (section 11.6.2). The technical data gives the same figures as maximum DHW gas flow rate, except LPG 28, where it gives 2.17 kg/h, not 1.87. Technical data maximum heating gas flow rate: NG 24 1.96, 28 2.54 m³/h; LPG 24 1.44, 28 1.87 kg/h. |
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From 0020145065_01 - 09/12
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 |
|---|---|---|
| Betacom2 24 | 47-019-16 | Not stated |
| Betacom2 28 | 47-019-17 | Not stated |
Source: Glow-worm Betacom2 24, Betacom2 28 Installation and Servicing, 0020145065_01 - 09/12.
Sections: 5 Technical data; 11.6 Gas rates (11.6.1 Operational gas inlet pressure, 11.6.2 Gas rate); 12.5 Test modes; 15.1 Gas conversion settings; 17.3 Combustion check and setting the air/gas ratio valve.
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.