Viessmann Vitoflame 100 Service Instructions For Contractors page 11

Further details regarding the individual steps
2. Check the supply pressure (flow
pressure), see the following table.
Note
The supply pressure (flow pres-
sure) should be between 20 and
25 mbar. The gas pressure switch
is factory set to 12.5 mbar. Never
alter this setting.
Supply pressure Measures
(flow pressure)
below 15 mbar Never change this setting; check the filter in the gas com-
bination valve and notify your gas supply utility.
15 to 18 mbar Please note: The boiler may only be temporarily operated
with this setting at stage 1 (emergency mode). Check the
filter in the gas combination valve. Notify your gas supply
utility.
18 to 50 mbar Start the boiler.
above 50 mbar Install a separate gas pressure governor with zero off up-
stream in the boiler system, and regulate the pressure to
20 mbar. Notify your gas supply utility.
Commissioning, inspection, maintenance
(cont.)
3. Record the actual value in the ser-
vice report (see from page 44).
4. Close the gas shut off valve.
5. Remove the U shaped pressure
gauge and close test connector A.
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