Viessmann VITODENS 333-F WS3A Service Instructions Manual page 15

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Further details regarding the individual steps
1. Close the gas shut-off valve.
2. Release screw A inside test con-
nector "PE" on the gas train, but do
not remove it; then connect the
pressure gauge.
3. Open the gas shut-off valve.
4. Measure the static pressure and
record it in the service report on
page 118.
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 pipe. After
approx. 5 s press "E" to reset the
burner.
Commissioning, inspection, maintenance
(cont.)
6. Check the supply (flow) pressure.
Set value:
Natural gas: 20 mbar
LPG: 37/50 mbar
Note
Use suitable test equipment with a
resolution of at least 0.1 mbar to
measure the supply pressure.
7. Record the actual value in the ser-
vice report on page 118.
Take the action shown in the follow-
ing table.
8. Shut down the boiler, close the gas
shut-off valve, remove the pressure
gauge and close test port A with
the screw.
9. Open the gas shut-off valve and
start up the boiler.
Danger
Gas escaping from the test
port leads to a risk of explo-
sion.
Check test connector A for
soundness.
15

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