Baxi Checked against MI

Baxi Baxi 600 Heat (613, 616, 619, 625, 630)

Heat only, natural gas

Combustion figures

Figure	Natural gas (G20)
CO₂ at high rate More infoHide info From Setting the gas valve (MI 10.3.11), maximum rate in chimney sweep mode. The MI says there must always be a difference of 0.4% between the maximum and minimum CO₂ readings. Same figure for all sizes.	9.3% ±0.1%
CO₂ at low rate More infoHide info From Setting the gas valve (MI 10.3.11), minimum rate in chimney sweep mode. Same figure for all sizes.	8.9% ±0.1%
Maximum CO More infoHide info From the combustion check flow chart (MI 7.4.2), measured at the flue gas test point.	Max rate < 350 ppm Min rate < 350 ppm
CO/CO₂ ratio More infoHide info Flow chart (MI 7.4.2) and MI 10.1 say less than 0.004. Technical data (MI 3.1) words it as up to a maximum of 0.004.	Max rate < 0.004 Min rate < 0.004
O₂	Not given in MI
Working inlet pressure More infoHide info At maximum rate (MI 7.5.1, Fig. 41). The text says at least 17 mbar at the valve and 18 mbar at the gas cock. At the gas meter: 19–23 mbar. Nominal dynamic inlet pressure 20 mbar (MI 3.1). Permissible pressure drop across system pipework ≤ 1 mbar.	Appliance inlet 18–22 mbar Gas valve test point 17–21 mbar
Gas rate at maximum More infoHide info Natural gas G20, after 10 minutes (MI 3.1). Measure with other appliances and pilot lights off (MI 7.5.1).	613 1.42 m³/h 616 1.75 m³/h 619 2.07 m³/h 625 2.73 m³/h 630 3.27 m³/h
Flue integrity More infoHide info At the air inlet test point, boiler at maximum rate (MI 7.4.2 and 10.1).	O₂ ≥ 20.6% CO₂ < 0.2%

From 7726858-01 (1/19)

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
Baxi 613 Heat	41-470-66	NG
Baxi 616 Heat	41-470-67	NG
Baxi 619 Heat	41-470-68	NG
Baxi 625 Heat	41-470-69	NG
Baxi 630 Heat	41-470-70	NG

Source: Baxi 600 Heat installation and service manual, gas fired wall mounted condensing boiler (Heat 613 - 616 - 619 - 625 - 630), 7726858-01 (1/19).

Sections: 3.1 Technical Data; 7.4.1 Chimney Sweep Mode (CSM); 7.4.2 Chimney Sweep Mode - Combustion Check; 7.5.1 Check the Operational (Working) Gas Inlet Pressure; 10.1 General; 10.3.11 Setting the Gas Valve (CO2 Check).

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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.