Checking Electrical Connections For Tightness 26. Checking Gas Equipment For Tightness At Operating Pressure; Flue Gas Emissions Test - Viessmann VITODENS 200-W Service Instructions Manual

Further details regarding the individual steps
3. Top up your heating system with
water until the filling pressure of a
cooled system is 0.1 to 0.2 bar higher
than the pre-charge pressure of the
diaphragm expansion vessel.
Checking gas equipment for tightness at operating pressure
Danger
Escaping gas leads to a risk of
explosion.
Check gas equipment for tight-
ness.

Flue gas emissions test

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 E and LL
■ 9.3 to 10.9 % for LPG P
For all gas types, the O
If the actual CO or O values lie outside their respective ranges, check the balanced
2 2
flue system for tightness, see page 18.
Note
During commissioning, the combustion controller carries out an automatic calibration.
Only test the emissions approx. 30 s after the burner has started.
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.
or O content. For a description of the electronic
2 2
content must be between 4.4 and 6.9 %.
2
(cont.)
Permiss. operating pressure: 4 bar
25