Vaillant ecoTEC plus Instructions For Installation And Servicing page 39

G20 % CO
Model
Case off
ecoTEC plus 415 9.1 + 0.2 - 0.5
ecoTEC plus 418 9.1 + 0.2 - 0.5
ecoTEC plus 428 9.1 + 0.2 - 0.5
ecoTEC plus 438 8.8 + 0.2 - 0.5
Table 9.1 CO/CO ratio
2
• If required, using a screwdriver, adjust the "A" throt-
tle to obtain correct value. (rotating anti-clockwise to
increase). Appliance will remain in this mode for 15
minutes or exit by pressing " i " and "+" simultaneous-
ly.
• Repeat the process above and select "P.2" for min
rate.
• Press " i " to operate appliance in this mode.
• Allow appliance to stabilise.
• Check CO2 value (for case off) as stated in table 9.1
for the boiler installed.
• If required, using a 2mm Allen key, adjust the "B" off-
set to obtain correct value (rotating clockwise to in-
crease). When complete repeat the P1 Max rate setting
to ensure it is correct following this.
• After checking the combustion, exit by pressing " i "
and "+" simultaneously
• Refit the chassis panel and the inner case. (Note the
CO2 will increase slightly).
Fig. 9.2 Gas control valve
Instructions for installation and servicing ecoTEC plus 0020020828_07
Nat. Gas
after 5 mins at
2
Maximum
full load
CO/CO
Case on
<0.0026
9.3 + 0.2 - 0.5
<0.0026
9.3 + 0.2 - 0.5
<0.0026
9.3 + 0.2 - 0.5
<0.0026
9.0 + 0.2 - 0.5
"A" throttle – "Pmax" rotate
to increase
"B" offset adjustment
"Pmin" rotate
to increase
G31 % CO after 5 mins at full
2
load
2
Case off
ratio
10.1 + 0.5 - 0.5
10.1 + 0.0 - 1.0
10.5 + 0.3 - 0.8
9.8 + 0.2 - 0.8
h Note!
Only for natural gas:
Adjust only in increments of 1/8 turn and wait
approx. 1 minute after each adjustment until
the value stabilises.
Only for liquid gas:
Adjust only in very small
increments (approx. 1/16 turn), and wait approx.
1 minute after each adjustment until the value
stabilises.
Combustion Analysis 9
LPG
Throttle
Case on Adjustment
10.3 + 0.5 - 0.5 5 turns
10.3 + 0.0 - 1.0 5 turns
10.7 + 0.3 - 0.8 5 turns
10.0 + 0.2 - 0.8 8 turns
Maximum
CO/CO
2
ratio
<0.0026
<0.0026
<0.0026
<0.0026
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