Check Coaxial Venting System For Leaks (Circular Air Gap Measurement); Remove Burner Assembly - Viessmann VITODENS 200-W WB2B Start-Up/Service Instructions

Initial Start-up and Service
Steps
(continued)
I
nitial start-up
A
Fig. 8
A
Combustion air measuring port
S
ervice
L
K
G
F
D
B
Fig. 9 Removing burner assembly
20

13. Check coaxial venting system for leaks (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
the combustion air in the coaxial gap of
the air intake pipe. The vent pipe is
considered sufficiently leak-proof if a
CO concentration in the combustion
2
air no higher than 0.2% or an O
concentration no lower than 20.6% is
measured. If higher CO
lower O values are measured, check
2
venting system thoroughly.

14. Remove burner assembly

1. Switch the main power supply and
the ON/OFF switch "8" on the
boiler control to OFF.
2. Shut off the gas valve.
3. Unlock control unit A and fold
down. Remove cover B.
4. Pull the cables from the fan motor
C, gas valves D (x2), ionization
electrode G, ignition module E and
grounding wire F.
5. Release gas supply pipe fittings H
(x2).
6. Loosen the six Torx (T-30) screws
K and remove burner.
7. Check burner gasket L for damage
and replace if required. Generally
replace the burner gasket
every 2 years.
H
E
C
A
The vent pipe adaptor comes with
two measurement ports, one for
combustion air-intake measurement
and one for flue gas measurement.
concentration of
2
2
values or
2
Note the gasket between the gas
valve and the fitting.
To avoid damage to the burner, do
not lay burner on its cylindrical
burner tube.
Failure to heed this caution may
cause damage to the burner tube,
which may lead to improper
operation.
CAUTION