Initial Start-up and Service
18
Steps (continued)
11. Check all primary and secondary circuit c onnections for leaks
Initial start-up Service
Check heating system and domestic
hot water connections (if applicable).
Ensure all connections are pressure
tight.
Correct any leaks found on fittings,
pumps, valves, etc.
12. Perform combustion analysis
Initial start-up Service
A CO measurement (see page 16) must
be taken before and after working on gas
appliances to eliminate risks to health
and to guarantee the satisfactory condition
of the system.
Record the measured combustion
values in the sequence stated in the
Maintenance Record on page 70 in this
manual.
13. Check venting system for leaks (circular air gap measurement)
For sealed combustion, coaxial vent only.
Initial start-up
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
2
concentration of
the combustion air in the coaxial gap of
the air intake pipe. The vent pipe is
considered sufficiently leak-proof if a
CO
2
concentration in the combustion
airnohigherthan0.2%oranO
2
concentration no lower than 20.6% is
measured.
If higher CO
2
values or lower O
2
values
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.
Please note!
This test is not applicable for single -
wall venting system (non-sealed
combustion).
Combustion air measuring point
5285 961 v1.3
IMPORTANT
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