Removing The Burner And Checking The Burner Gasket (Replace Gasket Every Two Years) - Viessmann VITODENS 333-F WS3A Service Instructions Manual

Commissioning, inspection, maintenance
Further details regarding the individual steps
Removing the burner and checking the burner gasket
(replace gasket every two years)
1. Switch OFF the mains power sup-
ply to the control unit at the ON/
OFF switch.
2. Close the gas shut-off valve and
safeguard against reopening.
3. Pull electrical cables from differen-
tial pressure sensor A, gas valve
B, ionisation electrode C, earth
tab D, fan motor E and ignition
unit F.
4. Undo the fixing screws of gas con-
nection flange G.
18
(cont.)
5. Release four nuts H and remove
the burner.
!
Please note
Prevent damage to the wire
gauze.
Never rest the burner on the
gauze assembly.
6. Check burner gasket K for
damage.
Generally replace the burner gas-
ket every 2 years.