Operating instructions

47
3. Top up with water until the charge
pressure of the cooled system is at
least 1.0 bar, and is 0.1 to 0.2 bar
higher than the pre-charge pressure
of the expansion vessel.
Permiss. operating pressure: 3 bar
Checking all gas equipment for tightness at operating pressure
Danger
Escaping gas leads to a risk of
explosion.
Check all gas equipment for tight-
ness.
Note
Only use suitable and approved leak
detection agents (EN 14291) and devi-
ces for the tightness test. Leak detection
agents with unsuitable constituents
(e.g. nitrites, sulphides) can cause mate-
rial damage.
Remove residues of the leak detection
agent after testing.
Checking the combustion quality
The electronic combustion controller
automatically ensures optimum combus-
tion quality. During commissioning/
maintenance, only the combustion val-
ues need to be checked. As part of this,
measure the CO content and CO
2
or O
2
content and enter into the report on
page 179. For a description of the elec-
tronic combustion controller functions,
see page 156.
Note
Operate the appliance with uncontami-
nated combustion air to prevent operat-
ing faults and damage.
CO content
■ The CO content must be < 400 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, CO
2
or O
2
values lie
outside their respective ranges, proceed
with the following steps:
■ Carry out a tightness test of the bal-
anced flue system, see page 39.
■ Check the ionisation electrode and
connecting cable, see page 42.
Note
During commissioning, the combustion
controller carries out an automatic cali-
bration. Only test the emissions approx.
30 s after the burner has started.
Commissioning, inspection, maintenance
Further details regarding the individual steps
(cont.)
5772 909 GB
Service