Viessmann VITODENS 200 Start-Up And Service Instructions page 19

Steps
(continued)
S
ervice
S
ervice
S
ervice
14. Disassemble burner and check burner gasket
1. Remove burner cover panel (if still
installed) as per the removal and
reinstallation instructions on page 7
in this manual, and reinstall panel
upon completion of service work.
2. Switch off the heating system
switch on the control unit and the
power supply.
3. Close gas shutoff valve and secure.
4. Disconnect electrical cables from fan
motor , differential air pressure
sensor , combination gas valve
, ionization electrode
transformer and grounding
5. Remove two screws
disconnect gas line from gas valve.
6. Loosen six hexagon socket head cap
screws and remove burner.
7. Check burner gaskets for damage
and replace if required (see Parts
List).
15. Visually check exterior of burner mesh assembly
To check the exterior of the burner
mesh assembly for physical damages,
such as dents, corrosion and/or
abnormally large holes:
1. Remove burner cover panel, if still
installed (see page 7). Reinstall
panel upon completion of service
work.
16. Replace burner mesh assembly (if wire mesh is damaged)
1. Remove electrodes .
3. Turn thermal insulation ring
clockwise and remove.
2. Unsrew the eight Torx screws
and remove burner mesh assembly
and assembly gasket
3. Remove existing burner mesh
assembly gasket .
4. Fit new burner mesh assembly with
the new gasket and tighten with the
eight Torx screws.
Initial Start-up and Service
, ignition
.
to
CAUTION
Do not lay burner on burner mesh
assembly (wire mesh)!
IMPORTANT
Do not replace gasket
inspecting the exterior of the mesh
assembly.
.
Tighten to a torque of 3.3 lb.ft. /
4.5 Nm
when visually
19