Alpha E-Tec S system (E-Tec 20S, 30S)
System boiler, natural gas (LPG by conversion kit)
Combustion figures
| Figure | Natural gas (G20) | LPG (G31) |
|---|---|---|
CO₂ at high rate More infoHide infoCO₂ at maximum DHW output: 99% in chimney sweep mode, case fitted, at the flue test point. Section 2.1 also lists CO₂ at maximum CH output with no tolerance (NG 20S 9.7%, 30S 9.5%; LPG 20S 11.4, 30S 11.2); MI 5.6 says CO₂ testing at the 80–90% max CH output is not required. |
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CO₂ at low rate More infoHide infoCO₂ at minimum output: 0% (low fire) in chimney sweep mode, case fitted, at the flue test point. |
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Maximum CO More infoHide infoGiven in the NG table only. The LPG table says other technical data is the same as NG data. | 450 ppm | 450 ppm |
CO/CO₂ ratio More infoHide infoMaximum. MI section 6 says the ratio should be less than 0.004. Given in the NG table only; the LPG table says other technical data is the same as NG data. | 0.004 | 0.004 |
O₂ | Not given in MI | Not given in MI |
Working inlet pressure More infoHide infoMeasurement point not stated in MI. Given as Gas supply pressure in Section 2.1, with no tolerance. | 20 mbar | 37 mbar |
Gas rate at maximum More infoHide infoGas rate at maximum output, Section 2.1. |
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From Part No. 1.041383 rev. ST.003581/001 (0518/D382)
Enter service mode for high and low rate
High rate
- With no heating or hot water demand, hold RESET for 8 seconds. The parasol and snowman symbols flash together.
- Press the hot water ▲ button (tap symbol, left-hand top) to step up to maximum, 99%. The levels are 0%, 80–90% and 99%.
- If a Climatic controller is fitted it shows ERR>07. That’s not a fault.
Low rate
- Press the hot water ▼ button (left-hand bottom) for minimum, 0%.
- Press the hot water ▲ button to go back to maximum.
Ending the test
- Turn the boiler off to come out: hold the Off/Stand-by/Summer/Winter button for 8 seconds. It also ends by itself after 15 minutes.
Models
| Model | Gas |
|---|---|
| E-Tec 20S | NG |
| E-Tec 30S | NG |
Source: Alpha E-Tec 20S and 30S installation and servicing instructions, Part No. 1.041383 rev. ST.003581/001 (0518/D382).
Sections: 2.1 Technical performance data; 2.6 Data badge annotation; 5.6 Checking the combustion - chimney sweep mode; 5.11 Converting the boiler to operate on LPG; 5.12 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.