Viessmann VITODENS 343-F WS4A Installation And Service Instructions Manual page 34

Commissioning, 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 25 mbar 42.5 to 57.5 mbar
in excess of in excess of
25 mbar 57.5 mbar
34
(cont.)
6. Check the supply (flow) pressure;
this should be as follows:
Natural gas 20 mbar
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 follow-
ing table.
7. Shut down the compact boiler,
close the gas shut-off valve,
remove the pressure gauge and
close test connector A with the
screw.
8. Danger
Gas escaping from the test
nipple leads to a risk of
explosions.
Check for soundness.
Open the gas shut-off valve, start
the boiler and check for soundness
at test connector A.
Measures
Do not start the boiler. Notify your
mains gas or LPG supplier.
Start the boiler.
Install a separate gas pressure gover-
nor upstream of the system and regu-
late the inlet pressure to 20 mbar for
natural gas or 50 mbar for LPG. Notify
your mains gas or LPG supplier.