Removing The Burner And Checking The Burner Gasket (Replace Gasket Every Two Years) - Viessmann VITODENS 343-F WS4A Installation And Service Instructions Manual

Commissioning, inspection, maintenance
Further details regarding the individual steps
The flue pipe is deemed to be sound if
the CO concentration in the combus-
2
tion air is no higher than 0.2 % or the
O concentration is at least 20.6 %.
2
Removing the burner and checking the burner gasket
(replace gasket every two years)
1. Switch OFF the main power supply
and the ON/OFF switch at the con-
trol unit.
2. Close the gas shut-off valve and
safeguard against reopening.
3. Pull electrical cables from fan
motor A, gas valve B, ionisation
electrode C, ignition unit D and
earth tab E.
36
(cont.)
If actual CO values are higher or O
2
values are lower, then pressure test
the flue pipe with a static pressure of
200 Pa.
4. Undo the fixing screws of gas con-
nection flange F.
5. Release four nuts G and remove
the burner.
!
Please note
Prevent damage to the wire
gauze.
Never rest the burner on the
gauze assembly.
2