Removing The Burner And Checking The Burner Gasket (Replace Gasket Every Two Years) - Viessmann VITODENS 300 Service Instructions Manual

Initial start-up, 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 control unit ON/
OFF switch and the mains electri-
cal supply.
2. Close the gas shut-off valve and
safeguard against reopening.
3. Pull electrical cables from fan
motor A, differential pressure sen-
sor B, gas valve C, ionisation
electrode D, ignition electrodes
E and earth F.
4. Unscrew the fixing screws of gas
supply flange G.
20
(cont.)
5. Release four nuts H and remove
the burner.
!
Important information
Prevent damage to the wire
mesh.
Never rest the burner on the
gauze assembly.
6. Check the burner gasket K for
damage.
Generally, replace the burner gas-
ket every two years.