Glow-worm Ultracom 2 sxi system (12sxi, 18sxi, 30sxi)
System boiler, natural gas, 18sxi and 30sxi convertible to LPG
Combustion figures
| Figure | Natural gas (G20) | LPG (G31) |
|---|---|---|
CO₂ at high rate More infoHide infoSame for all sizes. Case on is the check figure and case off the setting figure (MI 18.3.3), read after about 5 minutes at maximum (test mode P.01 set to 100). The technical data (MI 5) agrees. The table in MI 16.1.2 (gas conversion) has case on and case off 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%. LPG figures are for 18sxi and 30sxi only: the MI says 12sxi can’t be converted to LPG. |
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CO₂ at low rate More infoHide infoAt Qmin, from the technical data only (MI 5). Same for all sizes. LPG figures are for 18sxi and 30sxi only. |
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Maximum CO | Not given in MI | Not given in MI |
CO/CO₂ ratio More infoHide infoMust not be exceeded. Same for all sizes, checked at maximum rate (MI 18.3.3). | 0.004 | 0.004 |
O₂ | Not given in MI | Not given in MI |
Working inlet pressure More infoHide infoNominal supply pressure, checked at the gas service isolation valve test point with all other gas appliances operating (MI 12.5.1). The MI says the safe nominal maximum heat input can be achieved at an inlet pressure down to 15 mbar. |
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Gas rate at maximum More infoHide infoFrom the technical data (MI 5). The gas rates table in MI 12.5.2 (approx, after 10 mins from cold) gives the same for 12sxi but different maximums for the others: NG 18sxi 2.7 m³/h, 30sxi 3.77 m³/h; LPG 18sxi 1.98 kg/h, 30sxi 2.77 kg/h. The MI says 12sxi can’t be converted to LPG. |
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From 0020092785_02 - 05/10
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 |
|---|---|---|
| Ultracom2 12sxi | 41-019-12 | NG |
| Ultracom2 18sxi | 41-019-13 | NG |
| Ultracom2 30sxi | 41-019-14 | NG |
Source: Glow-worm Ultracom₂ sxi Installation and Servicing, 0020092785_02 - 05/10.
Sections: 2.3 Gas category; 5 Technical data; 12.5 Gas rates; 12.5.1 Operational gas inlet pressure; 12.5.2 Gas rate; 16.1.2 Adjusting the maximum power setting; 18.3.3 Maximum rate check and adjustment.
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.