Inspection and maintenance 9
0020149561_01 ecoCRAFT exclusive Installation and maintenance instructions
23
9.4
Adjusting the CO/CO
₂
ratio
Danger!
Increased risk of poisoning due to incor-
rect settings!
Incorrect setting may increase the risk of
poisoning. If one of the flue gas values is
greater than the acceptable values then
check:
▶
the integrity of the complete flue gas in-
stallation.
▶
the integrity of the combustion circuit
seals.
▶
the gas inlet working pressure.
▶
the gas flow rate.
1.
If the flue gas value at maximum load has to be adjus-
ted:
1
2.
Remove the black cover cap to reach the screw of the
main throttle on gas valve
(1)
.
3.
Be sure that the boiler is running in P.1 for full load.
(
→
Page 15)
4.
Specify the required flue gas value if necessary by turn-
ing the screw of the main throttle
(1)
.
Settings for
VKK GB 806/3-E R1 - VKK
GB 2806/3-E R1
Unit
Natural gas (H)
Tolerance
CO
₂
after 5 minutes full load
mode (P.1)
Vol.
–
%
9.3
±
0.2
CO
₂
after 5 minutes minimum
load mode (P.2)
Vol.
–
%
9.0
±
0.2
Set for Wobbe index W
s
kWh/m
³
15.0
CO value with full load
ppm
< 200
CO/CO
₂
< 0.0023
5.
Use a 3 mm hexagon socket spanner to turn the screw.
–
Turn to the left: higher CO
₂
concentration
–
Turn to the right: lower CO
₂
concentration.
Note
Only perform the adjustment in increments
of 1/8 turn and wait approximately 1 minute
after each adjustment until the value stabil-
ises.
6.
After performing the adjustments, check the CO
₂
con-
centration in minimum load.
7.
If the flue gas value in minimum load needs to be adjus-
ted:
1
8.
Remove the cover cap of the zero point screw
(1)
on
the gas valve.
9.
Be sure that the boiler is running in
P.2
for full mode.
–
The full load mode is also deactivated if no button is
pushed for 15 minutes.
10. Specify the required flue gas value if necessary by turn-
ing the screw of the zero point
(1)
.
11. Use a Torx Tx40 socket spanner to turn the screw.
–
Turn to the right: higher CO
₂
concentration
–
Turn to the left: lower CO
₂
concentration.
Note
The adjustment is very sensitive. Only per-
form the adjustment in increments of 1/16
turn. Wait approximately one minute after
each adjustment until the value stabilises.
12. After performing the adjustments, push the
i
button to
deactivate the minimum load mode.
–
The minimum load mode is also deactivated if no
button is pushed for 15 minutes.
13. Fit the cover caps on the gas valve.
14. The cover caps shall be sealed after the adjustment.
Danger!
Risk to life due to poisoning!
CO is an extremely toxic gas. Risk to life due
to excessive CO concentrations.
▶
If you are not able to adjust the boiler
correctly and the flue gas values remain
higher than allowed call the Vaillant Cus-
tomer Service Centre.
▶
Do not start up the boiler.
15. Put the front casing back on.
