Vaillant eco TEC plus 415, Instructions Manual

Page: 37 / 172

Installation and Servicing ecoTEC plus
37
Combustion analysis 9
9 Combustion analysis
Note!
The boiler is fitted with a combustion analysis
test point. A suitable combustion analyser
can be connected to this point to establish the
combustion performance of the boiler.
9.1 Check CO
2
content
Refer to table 9.1 and if necessary set (air-ratio
adjustment).
Note!
Combustion analysis must be carried
out at annual service if a flue gas analyser
is available, if no analyser is available then
visual checks should be carried out as per
service schedule. Checking/adjustment of
this value is also required in the following
instances: replacement of gas valve,
conversion to or from natural gas/LPG or if
incorrect combustion is suspected!
• Remove the front and inner cover.
• Press the “+” and “-” keys simultaneously.
The “Full load mode” is activated.
• Wait at least 5 minutes until the appliance reaches
its operating temperature.
• Measure the CO
2
content at the combustion
products test point, see fig 9.1.
• If necessary, set the corresponding flue gas value
(value with removed appliance front, see table 9.1)
by turning “A” throttle, see fig 9.2.
-> Turn to the left: higher CO
2
content,
-> Turn to the right: lower CO
2
content,
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.
• Check the CO
2
content again.
• If necessary, repeat setting.• Press the “+”
and “-” keys simultaneously.
The “Full load mode” is turned off. The full
load mode is also turned off if no key is
pressed for 15 minutes.
• Attach the inner and front cover.
"A" throttle –
"Pmax" rotate
to increase
"B" offset adjustment
"Pmin" rotate
to increase
Fig. 9.2 Gas control valve
Table 9.1
COMBUSTION
PRODUCTS
TEST POINT
Fig. 9.1 Test point
NAT.GAS G20 PROPANE G31
CASE OFF CASE ON CASE OFF CASE ON THROTTLE
CO
2
% CO
2
% CO
2
% CO
2
% ADJUSTMENT
ecoTEC
plus 415 9.1+0.2-0.5 9.3+0.2-0.5 10.1+0.5-0.5 10.3+0.5-0.5
5 TURNS
ecoTEC
plus 418 9.1+0.2-0.5 9.3+0.2-0.5 10.1+0.0-1.0 10.3+0.0-1.0
5 TURNS
ecoTEC
plus 428 9.1+0.2-0.5 9.3+0.2-0.5 10.5+0.3-0.8 10.7+0.3-0.8
5 TURNS
ecoTEC
plus 438 8.8+0.2-0.5 9.0+0.2-0.5 9.8+0.2-0.8 10.0+0.2-0.8
8 TURNS
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