Alpha Eco² Plus combi (Eco² Plus)
Combi, natural gas and LPG
Combustion figures
| Figure | Natural gas (G20) | LPG (G31) |
|---|---|---|
CO₂ at high rate More infoHide infoFront case fitted. The chimney sweep check (MI 5.7) runs up to maximum CH output; the full calibration (MI 5.13) sets maximum DHW output (99%). MI 2.1 also gives CO₂ at medium output (ignition): NG 9.0%, LPG 10.7%, same tolerances (display 56 in chimney sweep mode). The NG tolerance is printed once as Factory set CO₂ (± 0.8%); the LPG tolerance is printed beside each figure as % (±1%). |
|
|
CO₂ at low rate More infoHide infoPrinted as CO₂ at minimum output. Check with the CH knob at minimum, once the self-diagnosis symbol stops flashing (MI 5.7). | 9.0% ± 0.8% | 10% ± 1% |
Maximum CO More infoHide infoPrinted as CO (max) in the NG table. The LPG table says other technical data is the same as NG data. | 200 ppm | 200 ppm |
CO/CO₂ ratio More infoHide infoPrinted as Maximum CO/CO₂ in the NG table; the LPG table says other technical data is the same as NG data. MI section 6 says to investigate if the ratio is greater than 0.003. | 0.003 | 0.003 |
O₂ | Not given in MI | Not given in MI |
Working inlet pressure More infoHide infoMeasurement point not stated in MI. Printed as gas supply pressure in MI 2.1, a single figure with no range. | 20 mbar | 37 mbar |
Gas rate at maximum More infoHide infoNG is printed as gas rate at max. output. The LPG table says only gas rate, without saying at which output. | 3.04 m³/h | 1.19 m³/h |
From Part No. 1.038095 rev. ST.001592/000 (0415/D345)
Enter service mode for high and low rate
High rate
- With the front case fitted and no heating or hot water demand, hold RESET for 8 seconds. The parasol and snowman symbols flash together.
- Turn the central heating knob to maximum. Display shows 99.
- If a Climatic controller is fitted it shows ERR>07. That’s not a fault.
Low rate
- Turn the central heating knob to minimum. Display shows 00.
- For the medium (ignition) check, turn the knob until the display shows 56.
Ending the test
- Turn the boiler off (hold the On-Off/Standby button for 8 seconds) to come out. It also ends by itself after 15 minutes.
Models
| Model | Gas |
|---|---|
| Eco² Plus | NG |
Source: Alpha Eco² Plus installation and servicing instructions, Part No. 1.038095 rev. ST.001592/000 (0415/D345).
Sections: 2.1 Technical performance data (NG and LPG); 5.7 Checking the combustion - chimney sweep mode; 5.12 Converting the boiler to operate on LPG; 5.13 CO2 set up procedure; 6 Routine servicing (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.