Baxi Baxi 600 System (615, 618, 624, 624 LPG)
System boiler, natural gas and LPG
Combustion figures
| Figure | Natural gas (G20) | LPG (G31) |
|---|---|---|
CO₂ at high rate More infoHide infoSame for all models. The MI prints the tolerance as + upper / – lower. The case front panel must be fitted when checking combustion (7.4.2). The NG gas valve setting table in 9.3.8 gives 8.8% + 0.3 – 0.2 without saying case on or off; this matches the case off figure. |
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CO₂ at low rate More infoHide infoSame for all models. The NG gas valve setting table in 9.3.8 gives 8.3% + 0.1 – 0.4 without saying case on or off; this matches the case off figure. |
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Maximum CO More infoHide infoAt maximum and minimum rate (Fig.40 Combustion procedure). | < 350 ppm | < 350 ppm |
CO/CO₂ ratio More infoHide infoAt maximum and minimum rate (Fig.40 Combustion procedure). | < 0.004 | < 0.004 |
O₂ | Not given in MI | Not given in MI |
Working inlet pressure More infoHide infoNG: at the meter 19–23 mbar (Fig.36). 7.4.1 says the working pressure at the gas inlet test point, boiler at maximum, must be at least 18 mbar; fault finding gives a minimum of 17 mbar at the gas valve (10.2.3) and 19 mbar at the meter (10.1.1). LPG: Measurement point not stated in MI. 37 mbar is the G31 supply pressure in the LPG gas category table (14.3); the MI gives no LPG working inlet pressure range. |
| 37 mbar |
Gas rate at maximum More infoHide infoLPG figure is for the 24 LPG, the only LPG model. Gas rate at minimum: NG 0.49 m³/h all sizes, LPG 0.34 kg/h. |
| 1.83 kg/h |
Flue integrity More infoHide infoAt the incoming air test point on the flue adaptor, boiler at maximum rate. | O₂ ≥ 20.6% CO₂ < 0.2% | O₂ ≥ 20.6% CO₂ < 0.2% |
From 7686961-01
Enter service mode for high and low rate
High rate
Low rate
Models and GC numbers
| Model | GC number | Gas |
|---|---|---|
| 15 (615) | 41-470-56 | NG |
| 18 (618) | 41-470-57 | NG |
| 24 (624) | 41-470-59 | NG |
| 24 LPG (624 LPG) | 41-470-64 | LPG |
Source: Baxi System 615 - 618 - 624, 624 LPG Installation and Service Manual (High Efficiency Wall Hung Condensing Gas Boiler), 7686961-01.
Sections: 3.2.1 Technical information (Tab.5, Tab.7); 7.4.1 Check the operational (working gas inlet pressure and gas rate); 7.4.2 Checking combustion - chimney sweep mode; Fig.40 Combustion procedure; 9.1 General; 9.3.8 Gas valve and Setting the gas valve (CO₂); 10.1.1 Initial error fault finding checks; 10.2.3 Fault finding solutions sections F to H; 14.3 Differences for LPG models.
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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.