Glow-worm Ultracom cxi combi (24cxi, 30cxi, 38cxi)
Combi, natural gas (LPG by conversion)
Combustion figures
| Figure | Natural gas (G20) | LPG (G31) |
|---|---|---|
CO₂ at high rate More infoHide infoCHECK column, case on. The MI uses one table for both maximum and minimum rate. If adjusting, set to the SETTING column, case off: NG 24cxi, 30cxi 9.1% +0.2/−0.5, 38cxi 8.8% +0.2/−0.5; LPG 24cxi 10.0% +0.0/−0.9, 30cxi 10.5% +0.3/−0.7, 38cxi 9.8% +0.2/−0.8. The Boiler Specification table (section 1) gives NG nominal CO₂ case on 9.3% (24cxi, 30cxi), 9.0% (38cxi), and case off 9.1% (24cxi, 30cxi), 8.8% (38cxi). |
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CO₂ at low rate More infoHide infoCHECK column, case on. Same table as maximum rate: the MI gives no separate minimum rate figures. SETTING column (case off) as for high rate. |
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Maximum CO | Not given in MI | Not given in MI |
CO/CO₂ ratio More infoHide infoMust not exceed this value. If it does, a full service is needed (MI section 13). | 0.004 | 0.004 |
O₂ | Not given in MI | Not given in MI |
Working inlet pressure More infoHide infoOperational supply pressure at the gas service isolation valve test point, with all other gas appliances working. 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 infoApproximate, after 10 minutes from cold (commissioning table, MI section 12.5). The Boiler Specification table (section 1) gives a lower approximate CH maximum gas rate for NG: 24cxi 1.94 m³/h, 30cxi 2.45 m³/h, 38cxi 3.19 m³/h. |
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From 0020020820-04 09.09
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 |
|---|---|---|
| Ultracom 24cxi | 47-019-01 | NG |
| Ultracom 30cxi | 47-019-02 | NG |
| Ultracom 38cxi | 47-019-03 | NG |
Source: Glow-worm Ultracom cxi Installation and Servicing, 0020020820-04 09.09.
Sections: 1 Boiler Specification; 12.4 Initial Lighting; 12.5 Check the Gas Inlet Pressure and Gas Rate; 12.9 LPG Conversion; 13 Servicing: Combustion check and setting the air/gas ratio valve (1. Maximum rate, 2. Minimum rate, 3. Re-check CO2 and CO/CO2 ratio).
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.