Checking The Combustion Quality - Viessmann Vitodens 333-F Service Instructions Manual

Further details regarding the individual steps
4. Close flap D.

Checking the combustion quality

The electronic combustion control unit automatically ensures an optimum com-
bustion quality. Only the combustion values need to be checked during commis-
sioning and maintenance. For this, check the CO
description of the electronic combustion control unit, see page 115.
CO or O content
2 2
& The CO content must be within the following ranges (upper and lower out-
2
put):
– 7.7 to 9.2% for natural gas E and LL
– 9.3 to 10.9% for LPG P
& For all gas types, the O
If the actual CO or O
2
with the following steps:
& Check the balanced flue system for tightness, see page 19.
& Check the ionisation electrode and connecting cable, see page 23.
& Check the parameters of the combustion control unit, see page 97.
Note
During commissioning, the combustion control unit carries out an automatic
calibration. This may lead to CO emissions in excess of 1000 ppm for a short
time.
Commissioning, inspection, maintenance
content must be between 4.4% and 6.9%.
2
values lie outside their respective ranges, proceed
2
1. Connect a flue gas analyser at flue
2. Open the gas shut-off valve, start
3. Adjust the lower output.
(cont.)
or O content. For a function
2 2
gas port A on the boiler flue con-
nection.
the boiler and create a heat
demand.
Constant temperature control
unit:
K + d press simultaneously:
"1" is shown.
31