The flue pipe is deemed to be gas-
tight if the CO
2
concentration in the
combustion air is no higher than 0.2 %
or the O
2
concentration is at least
20.6 %.
If actual CO
2
values are higher or O
2
values are lower, then pressure test
the flue pipe with a static pressure of
200 Pa.
Removing the burner and checking the burner gasket
(replace gasket every 2 years)
1.
Switch OFF the control unit ON/
OFF switch and the power supply.
2.
Close the gas shut-off valve and
safeguard against reopening.
3.
Pull cables from fan motor
A
, gas
train
B
, ionisation electrode
C
,
ignition unit
D
and earth tab
E
.
4.
Undo gas supply pipe fitting
F
.
Further details regarding the individual steps
(cont.)
17
Commissioning, inspection, maintenance
5692
673
GB
Summary of Contents for VITODENS 300-W
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