Vaillant Checked against MI

Vaillant ecoTEC plus system (612, 615, 618, 624, 630, 637)

System boiler, natural gas and LPG

Combustion figures

Figure	Natural gas (G20)	LPG (G31)
CO₂ at high rate More infoHide info After 5 minutes in full load mode (test program P.1), measured at the flue gas analysis point. If adjustment is needed, set it to the front removed figure (MI 7.1.4).	Front closed 9.2% ± 1,0 Front removed 9.0% ± 1,0	Front closed 10.2% ± 0,5 Front removed 10.0% ± 0,5
CO₂ at low rate	Not given in MI	Not given in MI
Maximum CO More infoHide info At full load.	< 250 ppm	< 250 ppm
CO/CO₂ ratio	< 0,0031	< 0,0026
O₂	Not given in MI	Not given in MI
Working inlet pressure More infoHide info The NG lines are for the gas valve test point (the reference test point: sealing screw marked in on the gas valve), measured at full load in test program P.1. The MI also asks for the gas pipework to be sized so 20 mbar is available at the boiler inlet at full flow rate (MI 4.9), the technical data gives the inlet gas working pressure required as 20 mbar NG and 37 mbar LPG with no measurement point (MI 2.1), and the fault finding checks say 20 mbar should be available at the gas valve (MI 8.1).	612, 615, 618, 624, 630 16–23 mbar 637 15–23 mbar	Gas valve test point 23–43 mbar
Gas rate at maximum More infoHide info Nominal rate with the +5% and −10% tolerance limits (Table 5.1). Measured at the gas meter after at least 5 minutes in test program P.1, with all other gas appliances off. Table 5.1 gives propane rates for every size, but only the 618 and 630 are listed in LPG. The technical data gives a rounded NG connected load at 15 °C and 1013 mbar: 1.3, 1.6, 1.9, 2.6, 3.2, 4.0 m³/h (MI 2.1).	612 1.29 m³/h (+5%: 1.36, −10%: 1.16) 615 1.62 m³/h (+5%: 1.70, −10%: 1.46) 618 1.95 m³/h (+5%: 2.04, −10%: 1.75) 624 2.59 m³/h (+5%: 2.72, −10%: 2.33) 630 3.24 m³/h (+5%: 3.40, −10%: 2.91) 637 4.00 m³/h (+5%: 4.20, −10%: 3.60)	612 0.95 kg/h (+5%: 1.00, −10%: 0.85) 615 1.19 kg/h (+5%: 1.25, −10%: 1.07) 618 1.43 kg/h (+5%: 1.50, −10%: 1.29) 624 1.90 kg/h (+5%: 2.00, −10%: 1.71) 630 2.38 kg/h (+5%: 2.50, −10%: 2.14) 637 2.94 kg/h (+5%: 3.08, −10%: 2.64)
Flue integrity More infoHide info Checked with the flue gas analyser at the air measure point; strongly recommended where the flue is longer than 2 m. If any CO or CO₂ is found, find and correct the flue gas leak or recirculation; if it can’t be corrected, don’t start the boiler (MI 5.9.1).	No CO or CO₂ in the fresh air	No CO or CO₂ in the fresh air

From 839592_12 GBIE 062010

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
ecoTEC plus 612	41-044-44	NG
ecoTEC plus 615	41-044-45	NG
ecoTEC plus 618	41-044-46	NG
ecoTEC plus 618 Propane	41-044-51	LPG
ecoTEC plus 624	41-044-47	NG
ecoTEC plus 630	41-044-48	NG
ecoTEC plus 630 Propane	41-044-50	LPG
ecoTEC plus 637	41-044-49	NG

Source: Instructions for installation and servicing ecoTEC, 839592_12 GBIE 062010.

Sections: 1.3 Introduction; 1.7 Gas council numbers; 2.1 Technical data; 4.9 Gas connection; 5.9.1 Checking for tightness of the flue gas installation and flue gas recirculation; 5.9.2 Checking the gas flow rate; 5.9.3 Checking the gas inlet working pressure; 7.1.3 Checking the CO2 concentration; 7.1.4 Adjusting the CO2 concentration (or the air ratio); 8.1 Logical fault finding procedure; 8.2 Test programs.

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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.