Viessmann Vitodens 100-W Installation And Service Instructions Manual page 25

Further details regarding the individual steps
1. Close the gas shut-off valve.
2. Undo screw in test connector A on
the gas train, but do not remove it.
Connect the pressure gauge.
3. Open the gas shut-off valve.
4. Check the static pressure.
Set value: max. 57.5 mbar
5. Start the boiler.
Note
During commissioning, the appli-
ance can enter a fault state
because of airlocks in the gas line.
After approx. 5 s, press RESET to
reset the burner.
6. Check the supply (flow) pressure.
Set value:
■ Natural gas: 20 mbar
■ LPG: 37 mbar
Note
Use a suitable measuring device
with a resolution of at least
0.1 mbar to check the supply pres-
sure.
Supply pressure (flow pressure)
For natural gas
Below 17.4 mbar
17.4 to 25 mbar
Above 25 mbar
For LPG
Below 25 mbar
25 to 47 mbar
Above 47 mbar
Commissioning, inspection, maintenance
(cont.)
7. Implement measures as indicated
in the table below.
8. Shut down the boiler, close the gas
shut-off valve, remove the pressure
gauge and tighten the screw in test
connector A.
9. Open the gas shut-off valve and
start the appliance.
Danger
Gas escaping from the test
connector leads to a risk of
explosion.
Check gas tightness at test
connector A.
Note
The maximum pressure drop between
the gas shut-off valve and test connec-
tor A at the gas train is 0.5 mbar.
Steps
Do not commission the boiler. Notify the
gas supply utility or LPG supplier.
Start the boiler.
Install a separate gas pressure governor
upstream of the system and regulate the
pre-charge pressure to 20 mbar for nat-
ural gas or 37 mbar for LPG. Notify your
gas supply utility or LPG supplier.
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