49
Remove residues of the leak detection
agent after testing.
Checking combustion quality
The electronic combustion controller
automatically ensures optimum combus-
tion quality. During commissioning/
maintenance, only the combustion val-
ues need to be checked. For this, meas-
ure the CO content plus the CO
2
or O
2
content. For a description of the elec-
tronic combustion controller functions,
see page 160.
Note
To prevent operating faults and damage,
operate the appliance with uncontami-
nated combustion air.
CO content
■ The CO content must be < 1000 ppm
for all gas types.
CO
2
or O
2
content
■ The CO
2
content must be within the
following limits for upper and lower
heating output respectively:
– 7.5 to 9.5 % for natural gas E and LL
– 8.8 to 11.1 % for LPG P
■ For all gas types, the O
2
content must
be between 4.0 and 7.6 %.
If the actual CO
2
or O
2
values lie outside
their respective ranges, check the bal-
anced flue system for tightness, see
page 41.
Note
During commissioning, the combustion
controller carries out an automatic cali-
bration. Only measure the emissions
approx. 30 s after the burner has star-
ted.
A
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.
3.
Set the lower heating output (see
page 50).
4.
Check the CO
2
content. Should the
actual value deviate from the afore-
mentioned ranges by more than 1 %,
implement steps on page 49.
5.
Enter the actual values into the
report.
Commissioning, inspection, maintenance
Further details regarding the individual steps
(cont.)
5585 174 GB
Service