British Gas 330+ heat only (BG 330+)
Heat only, natural gas
Combustion figures
| Figure | Natural gas (G20) |
|---|---|
CO₂ at high rate More infoHide infoFrom the G20 burner % CO₂ table in MI 13.9. The text of 13.9 says the reading at max rate should be 9.3% ± 0.5 and to adjust the max rate CO₂ with the throttle to 9.3%, and the Boiler Specification (diagram 1.2) gives 9.3 nominal for both case on and case off. The table’s case-off setting of 9.2 does not match the 9.3% the text says to adjust to. |
|
CO₂ at low rate More infoHide infoMI 13.9: adjust the min rate CO₂ with the offset to 9.3%. The manual says this adjustment is very coarse. | 9.3% ± 0.5 |
Maximum CO | Not given in MI |
CO/CO₂ ratio | Not given in MI |
O₂ | Not given in MI |
Working inlet pressure More infoHide infoChecked at the pressure test point on the gas service isolation valve with the boiler firing at full rate (MI 12.7). The Boiler Specification gives Inlet gas working pressure 20mbar. |
|
Gas rate at maximum More infoHide infoApproximate max. gas rate after 10 mins. from cold (Boiler Specification, diagram 1.2). The range rating table in MI 12.5 gives 3.3 m3/hr at 30 kW. | 3.30 m³/h |
From 0020051424-02 11.07
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 |
|---|---|---|
| BG 330+ | 41-019-11 | NG |
Source: British Gas 330+ High Efficiency Condensing Boiler Installation and Servicing, 0020051424-02 11.07.
Sections: Statutory Requirements (Gas Supply); 1 Boiler Specification (diagram 1.2); 12.4 Initial Lighting; 12.5 Range Rating; 12.7 Gas Rate; 13.2 Functional Checks; 13.9 Combustion Check.
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.