Check Coaxial Venting System For Leaks; Remove Burner Assembly - Viessmann VITODENS 200-W Service Instructions Manual

Vitodens 200-W B2HA 112, 150 Service

Check Coaxial Venting System for Leaks

Remove Burner Assembly

(circular air gap measurement)
Viessmann strongly recommends that the heating
contractor perform a simplified leak test during boiler
start-up. For this purpose it is sufficient to measure
the CO concentration of the combustion air in the
2
coaxial gap of the air intake pipe. The vent pipe is
considered sufficiently leak-proof if a CO
in the combustion air no higher than 0.2% or an O
concentration no lower than 20.6% is measured.
If higher CO values or lower O
2
check venting system thoroughly.
Note: The vent pipe adaptor comes with two
measurement ports, one for combustion air-intake
measurement and one for flue gas measurement.
1. Switch the main power supply and the ON/OFF
switch "8" on the boiler control to OFF.
Note: Slide the black control cover outwards to
access the ON/OFF switch.
2. Shut off the gas valve.
3. Fold down control unit A and remove cover B.
4. Pull the cables from the fan motor C, gas valve D,
ionization electrode F and ignition module E.
5. Release gas supply pipe fitting G.
Note: there is a gasket between the gas valve and
the fitting.
6. Loosen the six Torx (T-30) screws H and remove
burner.
7. Check burner gasket K for damage. Generally
replace the burner gasket every 2 years.
CAUTION
To avoid damage to the burner, do not lay burner on its
cylindrical burner tube or touch the burner tube mesh.
Failure to heed this caution may cause damage to the
burner tube, which may lead to improper operation.
Start-up and Service
concentration
2
2
values are measured,
2
21