51
5.
Check that the
"MNT"
indicator on the fuel cell
module programming unit is OFF.
If the indicator is still illuminated, terminate mainte-
nance mode via the programming unit of the fuel
cell module: See the following chapter.
Terminating maintenance mode on the fuel cell module programming unit
1.
Check that
"Ecological"
,
"Economical"
or
"Energy manager OFF"
is selected at the pro-
gramming unit.
If not, select one of the operating modes.
2.
Use to select
"17"
on the fuel cell module pro-
gramming unit.
3.
Press and hold
SET
for at least 3 s.
"OFF"
will appear in
STATE
.
Maintenance mode has terminated if the
"MNT"
indicator is no longer illuminated.
Checking the balanced flue system for tightness (annular gap test)
A
Fig. 41
A
Combustion air aperture (ventilation air)
Note
The fuel cell module must be commissioned before the
annular gap check can be carried out.
For balanced flue systems tested together with the fuel
cell module, there is no requirement for a tightness test
(overpressure test) during commissioning by the flue
gas inspector.
In this case, we recommend that a simple tightness
test is carried out during system commissioning. For
this, check the CO
2
or O
2
concentration in the combus-
tion air at the annular gap of the balanced flue pipe.
If the CO
2
concentration is less than 0.2 % or the O
2
concentration is greater than 20.6 %, the flue pipe is
deemed to be sufficiently gas-tight.
Commissioning, inspection, maintenance
Terminating maintenance mode and activating…
(cont.)
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