39
Danger
Contact with live components can lead to seri-
ous injury from electric current. Some compo-
nents on PCBs remain live even after the power
supply has been switched off.
■
Never touch
the wiring chambers (control unit
and power supply connections).
■
When working on the appliance, isolate the
system from the power supply, e.g. at a sepa-
rate MCB/fuse or a mains isolator. Check the
system is no longer live and safeguard against
reconnection.
■
Prior to working on the appliance, wait at
least 4 min until the voltage has completely
dropped out.
Checking all gas equipment for leaks at operating pressure
Danger
Escaping gas leads to a risk of explosion.
Check gas equipment (including inside the appli-
ance) for leaks.
Note
Only use suitable and approved leak detection agents
(EN 14291) and devices for the tightness test. Leak
detection agents with unsuitable constituents (e.g.
nitrides, sulphides) can cause material damage.
Remove residues of the leak detection agent after test-
ing.
Fitting the front panel
See page 26.
Checking the combustion quality
The electronic combustion controller automatically
ensures optimum combustion quality. During commis-
sioning/maintenance, only the combustion values need
to be checked. To do this, test the CO content and CO
2
or O
2
content, and record these in the report on
page 71.
Note
To prevent operating faults and damage, operate the
appliance with uncontaminated combustion air.
Permissible CO content
The CO content must be < 1000 ppm for all gas types.
Permissible CO
2
or O
2
content
Operation with natural gas
Rated heating out-
put (kW)
CO
2
content (%)
O
2
content (%)
Upper heating out-
put
Lower heating out-
put
Upper heating out-
put
Lower heating out-
put
32
7.3 - 10.5
7.3 - 10.5
2.1 - 8.4
2.1 - 8.4
Commissioning, inspection, maintenance
Checking the electrical connections for firm seating
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