Viessmann VITOPEND 100-W Installation And Service Instructions Manual page 17

Further details regarding the individual steps
5. Start the boiler.
Note
During commissioning, the boiler
can enter a fault state because of
airlocks in the gas pipe.
To reset, switch the ON/OFF switch
on the control unit first OFF and
then ON again after approx. 3 s.
The ignition procedure will then be
repeated.
6. Check the supply (flow) pressure.
Set value:
Natural gas: 20/25 mbar
LPG: 37/50 mbar
Note
Use suitable test equipment with a
resolution of at least 0.1 mbar to
measure the supply pressure.
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
Commissioning, inspection, maintenance
(cont.)
7. Record the actual value in the ser-
vice report on page 54.
Take the action shown in the follow-
ing table.
8. Switch OFF the system at the con-
trol unit (the boiler shuts down),
close the gas shut-off valve,
remove the pressure gauge and
close test nipple A with the screw.
9. Open the gas shut-off valve and
start the boiler.
Danger
Gas escaping from the test
port leads to a risk of explo-
sion.
Check the test nipple for
soundness.
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.
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