Viessmann VITODENS 200-W Service Instructions Manual page 17

Further details regarding the individual steps
Supply (flow) pres-
sure for natural
gas
below 15 mbar
15 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
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
report.
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 nipple A with
the screw.
9. Danger
Gas escaping from the test
nipple leads to a risk of explo-
sion.
Check for gas tightness.
Open the gas shut-off valve, start the
boiler and check for tightness at test
nipple A.
Measures
Do not start 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 natu-
ral gas or 50 mbar for LPG. Notify your
gas supply utility or LPG supplier.
(cont.)
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