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Steps
(continued)
S
Start-up and Maintenance
ervice
Combustion air measuring point
S
Maintenance
ervice
Initial Start-up, Inspection and Maintenance
11. Check venting system for leaks (circular air gap measurement)
For sealed combustion, coaxial vent only
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.
12. Remove burner
To ensure continued efficient operation of the boiler, it is recommended that it is
checked and serviced as necessary at regular intervals. The frequency of
servicing will depend on the particular installation conditions and usage but in
general once a year should be adequate. Any service work must be carried out
by a licensed professional heating contractor.
The boiler incorporates a flue sampling point in front of the flue outlet. The flue
gases can be analyzed if required. The push fit cap may be removed and a
sample tube installed. The push fit cap must be replaced after use. The flue gas
sample will enable the heating contractor to judge whether any major action is
required. Before commencing any service operation, isolate and secure the main
power supply against accidental reactivation, and turn off the main gas supply.
If higher CO
values or lower O
2
are measured, check venting system
thoroughly.
Please note!
The vent pipe adaptor comes with two
measurement ports, one for
combustion air intake measurement
and one for flue gas measurement.
2
Please note!
This test is not applicable for single -
wall venting system (non-sealed
combustion).
1. Remove the screw at the top of the
boiler.
2. Press down the springs on the
underside of the boiler.
3. Remove the front panel.
4. Switch off the main power supply.
5. Close gas shutoff valve and secure
against reopening.
Continued on following page.
values
2
53
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