Viessmann VITODENS 200-W WB2B Series Start-Up/Service Instructions page 18

Initial Start-up and Service
Steps
(continued)
I
nitial start-up
A
Fig. 9
A
Combustion air measuring port
S
ervice
G
4x
E
D
C
B
Fig. 10 Removing burner assembly
18
14. 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 concentration of
2
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.
15. 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. Pull the cables from the fan motor
A, gas valve B, ionization
electrode C, ignition module D and
grounding wire E.
4. Release gas supply pipe fitting F.
5. Loosen the four Torx (T-30) screws
G and remove burner.
F
A
The vent pipe adaptor comes with
two measurement ports, one for
combustion air-intake measurement
and one for flue gas measurement.
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