Combustion Analysis; Check Co Content - Vaillant ecoTEC plus Instructions For Installation And Servicing

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 content
2
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 content at the combustion
2
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
-> Turn to the right: lower CO
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
• 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.
Installation and Servicing ecoTEC plus
content,
2
content,
2
content again.
Combustion analysis 9
Fig. 9.1 Test point
Fig. 9.2 Gas control valve
NAT.GAS G20
CASE OFF CASE ON
CO % CO %
2 2
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
ecoTEC
plus 418 9.1+0.2-0.5 9.3+0.2-0.5 10.1+0.0-1.0
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
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
Table 9.1
COMBUSTION
PRODUCTS
TEST POINT
"A" throttle –
"Pmax" rotate
to increase
"B" offset adjustment
"Pmin" rotate
to increase
PROPANE G31
CASE OFF CASE ON THROTTLE
CO % CO % ADJUSTMENT
2 2
5 TURNS
10.3+0.0-1.0 5 TURNS
5 TURNS
8 TURNS
37