Viessmann Vitodens 300 Service Instructions Manual page 13

Further details regarding the individual steps
Initial start-up, inspection, maintenance
(cont.)
1. Close the gas shut-off valve.
2. Release the screw inside test nip-
ple PE A on the gas combination
valve , but do not remove, and con-
nect the pressure gauge.
3. Open the gas shut-off valve.
4. Check the static pressure; it should
be a max. of 57.5 mbar. Record the
actual value in the service report.
5. Start up boiler.
Note
During commissioning, the boiler
can enter a fault state because of
airlocks in the gas pipe. After
approx. 5 seconds, press E to
reset the burner.
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.
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