Vaillant ecoTEC plus 418 - Page 90

● Remove the front and inner cover.
● To correct combustion follow the procedure as listed below.
● Ensure that the gas supply pressure is correct (see table 5.1)
● The gas inlet working pressure can be checked at the pressure test point on the gas
valve (fig 5.3).
● Turn gas supply on.
● Ensure there is an external heat demand.
● Enter the test programs by holding the “+” key, see fig 6.2. and turning power on.
● Press “+” until “P.1” is displayed for max rate.
● Press “ i ” to operate appliance in this mode.
● Allow appliance to stabilise.
● Measure the CO2 at the combustion analysis point point, see fig 9.1.
● Check CO2 value (for case off) as stated in table 9.1 for the boiler installed.
Table 9.1 CO/CO2 ratio
Model
NAT.GAS G20
PROPANE G31
G20 % CO2 after 5
mins at full load
Maximu
m
G31 % CO2 after 5
mins at full load
Throttle
Maximu
m
Case off
Case on
CO/CO2
ratio
Case off
Case on
Adjustmen
t
CO/CO2
ratio
ecoTEC
plus 415
9.1+0.2-
0.5
9.3+0.2-
0.5
<0.0026
10.1+0.5-
0.5
10.3+0.5-
0.5
5 turns
<0.0026