Checking Electrical Connections For Firm Seating 27. Checking All Gas Equipment For Tightness At Operating Pressure; Checking The Combustion Quality - Viessmann VITODENS 200-W Service Instructions Manual

Further details regarding the individual steps
Checking all gas equipment for tightness at operating pressure
Danger
Escaping gas leads to a risk of
explosion.
Check gas equipment for tight-
ness.

Checking the combustion quality

The electronic combustion controller automatically ensures an optimum combustion
quality. Only the combustion values need to be checked during commissioning and
maintenance. For this, check the CO
combustion controller functions, see page 132.
Note
Operate the appliance with uncontaminated combustion air to prevent operating
faults and damage.
CO or O content
2 2
■ The CO content must be within the following limits (upper and lower output):
2
– 7.7 to 9.2 % for natural gas H
– 9.3 to 10.9 % for LPG P
■ For all gas types, the O
If the actual CO or O
2
following steps:
■ Check the balanced flue system for tightness, see page 18.
■ Check the ionisation electrode and connecting cable, see page 21.
Note
During commissioning, the combustion controller carries out an automatic calibration.
Only test the emissions approx. 30 s after the burner has started.
or O
2
content must be between 4.4 % and 6.9 %.
2
values lie outside their respective ranges, proceed with the
2
Commissioning, inspection, maintenance
Note
For the tightness test, use only suitable
and approved leak detecting agents (EN
14291) and devices. Leak detecting
agents with unsuitable constituents (e.g.
nitrites, sulphides) can lead to material
damage.
Remove residues of the leak detecting
agent after testing.
content. For a description of the electronic
2
(cont.)
25