Worcester Bosch Greenstar CDi combi (27CDi, 30CDi, 37CDi, 42CDi)
Combi, natural gas and LPG
Combustion figures
| Figure | Natural gas (G20) | LPG (G31) |
|---|---|---|
CO₂ at high rate More infoHide infoFrom the CO₂ setting table in Setting the gas/air ratio, 5. Setting the CO₂ (MI page 53), boiler at maximum in central heating boost mode. CO₂ should be measured 10 minutes after firing the appliance. The technical data (MI page 6) gives the same figures without a tolerance. The MI says combustion is factory set and no adjustment is needed if the gas inlet pressure is correct (MI page 36). |
| 11.5 % ±0.2 |
CO₂ at low rate More infoHide infoFrom the CO₂ setting table (MI page 53), central heating control set to minimum while in central heating boost mode. The technical data gives the same figures without a tolerance. |
| 10.5 % ±0.2 |
Maximum CO More infoHide infoFrom Setting the gas/air ratio (MI page 53), checked at maximum. | less than 200 ppm | less than 200 ppm |
CO/CO₂ ratio | Not given in MI | Not given in MI |
O₂ | Not given in MI | Not given in MI |
Working inlet pressure More infoHide infoMeasured at the gas valve inlet point (inlet test nipple) with the boiler running at maximum in central heating boost mode, with all other gas appliances working (MI Commissioning, page 36). Setting the gas/air ratio (MI page 53) gives both as minimums: a minimum of 18 mbar for natural gas and 37 mbar for LPG. The MI gives no appliance inlet or meter figure. |
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Gas rate at maximum More infoHide infoMax. 10 minutes from lighting, natural gas figures for G20 (MI Technical data, page 6). Measure at the gas meter after 10 minutes at maximum (MI Commissioning, page 36). In central heating boost mode the boiler runs both the central heating and hot water circuits. The technical data gives a central heating max. rated heat input of 27.0 kW (27CDi) and 30.9 kW (30CDi, 37CDi, 42CDi), and a hot water max. rated heat input of 27.0, 32.0, 37.0 and 42.0 kW, for both gases. |
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From 6 720 614 564a (2007/07)
Enter service mode for high and low rate
High rate
- Hold the central heating boost button for 10 seconds until it lights up and stays lit.
- Turn the central heating temperature control to maximum. The boiler goes to maximum.
Low rate
- Turn the central heating temperature control to minimum. The boiler goes to minimum.
- Turn it back to maximum to return to maximum.
Ending the test
- Hold the central heating boost button for 2 seconds. The button goes out and the blue power light stays on.
- It also ends by itself after 15 minutes.
Models and GC numbers
| Model | GC number | Gas |
|---|---|---|
| Greenstar 27CDi | 47-406-12 | NG |
| Greenstar 30CDi | 47-406-14 | NG |
| Greenstar 37CDi | 47-406-08 | NG |
| Greenstar 42CDi | 47-406-10 | NG |
| Greenstar 27CDi LPG | 47-406-13 | LPG |
| Greenstar 30CDi LPG | 47-406-15 | LPG |
| Greenstar 37CDi LPG | 47-406-09 | LPG |
| Greenstar 42CDi LPG | 47-406-11 | LPG |
Source: Worcester Bosch Greenstar 27CDi/30CDi/37CDi/42CDi wall hung RSF gas-fired condensing combination boiler installation, commissioning and servicing instructions, 6 720 614 564a (2007/07).
Sections: Cover (GC numbers); Technical data (page 6); Commissioning (page 36); Setting the gas/air ratio, 5. Setting the CO₂ (page 53).
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.