Viessmann VITODENS 200-W Installation And Service Instructions Manual page 33

Checking the static and supply pressure
A
Fig.26
Supply (flow) pressure
for natural gas
Below 17.4 mbar
17.4 to 25 mbar
Above 25 mbar
Supply (flow) pressure
for LPG
Below 42.5 mbar
42.5 to 57.5 mbar
Above 57.5 mbar
Commissioning, inspection, maintenance
(cont.)
1. Close the gas shut-off valve.
2. Undo screw inside test connector "PE" on the
A
gas train, but do not remove it, and connect the
pressure gauge.
3. Open the gas shut-off valve.
4. Check the static pressure and record the actual
value in the report on page 129.
Set value: max. 57.5 mbar.
5. Start the boiler.
Note
During commissioning, the boiler can enter a fault
state because of airlocks in the gas line. After
approx. 5 s, press R to reset the burner.
6. Check the supply (flow) pressure. Set values:
■ Natural gas 20 mbar
■ LPG 50 mbar
Note
Use a suitable measuring device with a resolution
of at least 0.1 mbar to check the supply pressure.
7. Record the actual value in the service report.
Proceed as indicated in the following table.
8. Shut down the boiler, close the gas shut-off valve,
remove the pressure gauge and tighten screw in
test connector A .
9. Danger
Gas escaping from the test connector leads
to a risk of explosion.
Check for gas tightness.
Open the gas shut-off valve, start the boiler and
check for tightness at test connector
Procedure
Do not commission the boiler. Notify your 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 natural gas or 50 mbar for LPG. Notify your
gas supply utility or LPG supplier.
.
A
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