Viessmann VITODENS 300 Service Instructions Manual page 14

Initial start-up, inspection, maintenance
Further details regarding the individual steps
Supply (flow) Supply (flow)
pressure for nat- pressure for
ural gas LPG
below 17.4 mbar below 42.5 mbar
17.4 to 57.5 mbar 42.5 to
57.5 mbar
in excess of in excess of
57.5 mbar 57.5 mbar
14
(cont.)
6. Check the supply (flow) pressure; it
should be
for natural gas 20 mbar,
for LPG 50 mbar.
Note
Use suitable test equipment with a
resolution of at least 0.1 mbar to
test the supply pressure.
Record the actual value in the ser-
vice report.
Take the action shown in the table.
Remedy
Never start up the boiler. Notify your
mains gas or LPG supplier.
Start up the boiler.
Install a separate gas governor down-
stream of the system and regulate the
pressure to 20 mbar for natural gas or
50 mbar for LPG. Notify your mains gas
or LPG supplier.
7. Shut down the boiler, close the gas
shut-off valve, remove the pressure
gauge and close test port A with
the screw.
8. Danger
Gas escaping from the test
port leads to a risk of explo-
sion.
Check for soundness.
Open the gas shut-off valve, start
the boiler and check the soundness
of test port A.