Viessmann VITODENS 333 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
&
20 mbar for natural gas,
&
50 mbar for LPG.
Note
Use suitable test equipment with a
resolution of at least 0.1 mbar to
measure the supply pressure.
Record the actual value in the ser-
vice report.
Take the action shown in the table.
Remedy
Do not start up. Notify your mains gas or
LPG supplier.
Start up 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 nipple A
with the screw.
8. Open the gas shut-off valve and
start the boiler.
Danger
Gas escaping from the test
nipple leads to a risk of
explosion.
Check test nipple A for
soundness.