Checking The Combustion Quality - Viessmann VITODENS 222-F Installation And Service Instructions Manual

Further details regarding the individual steps

Checking the combustion quality

The electronic combustion control unit automatically ensures an optimum combustion
quality. Only the combustion values need to be checked during commissioning and
maintenance. For this, check the CO
electronic combustion control unit, see page 127.
CO or O content
2 2
■ The CO content must be within the following ranges (upper and lower output):
2
– 7.7 to 9.2% for natural gas H
– 9.3 to 10.9% for LPG
■ For all gas types, the O
If the actual CO or O
2 2
following steps:
■ Check the balanced flue system for tightness, see page 34.
■ Check the ionisation electrode and connecting cable, see page 38.
Note
During commissioning, the combustion control unit carries out an automatic calibra-
tion. Only test the emissions approx. 30s after the burner has started.
1. Connect a flue gas analyser at flue
gas port A on the boiler flue con-
nection.
2. Open the gas shut-off valve, start the
boiler and create a heat demand.
Commissioning, inspection, maintenance
or O content. For a function description of the
2 2
content must be between 4.4% and 6.9%.
2
values lie outside their respective ranges, proceed with the
3. Select the lower output (see
4. Check the CO
5. Enter actual values into the service
6. Select the upper output (see
7. Check the CO
(cont.)
page 48).
content. Should the
2
actual value deviate from the above
ranges by more than 1%, implement
steps from page 47 (from 'proceed
with the following steps', above).
report.
page 48).
content. Should the
2
actual value deviate from the above
ranges by more than 1%, implement
steps from page 47 (from 'proceed
with the following steps', above).
47