Viessmann FB2B Installation And Service Instructions Manual page 35

Further details regarding the individual steps
A
1. Close the gas shut-off valve.
2. Release the screw inside test nipple
"PE" A on the gas train but do not
remove it, then connect the pressure
gauge.
3. Open the gas shut-off valve.
4. Check the static pressure and record
it in the service report on page 159.
Set value: max. 37 mbar
5. Start the boiler.
Note
During commissioning, the boiler can
enter a fault state because of airlocks
in the gas line. After approx. 5 s,
press the reset button R (see operat-
ing instructions) to reset the burner.
Commissioning, inspection, maintenance
(cont.)
6. Check the supply (flow) pressure.
Set value:
■ Natural gas: 20 mbar
■ LPG: 37 mbar
Note
Use suitable test equipment with a
resolution of at least 0.1 mbar to
check the supply pressure.
7. Record the actual values in the serv-
ice report on page 159.
Take the action shown in the follow-
ing table.
8. Shut down the boiler, close the gas
shut-off valve, remove the pressure
gauge and close the screw in test nip-
ple A.
9. Open the gas shut-off valve and start
the appliance.
Danger
Gas escaping from the test
nipple leads to a risk of explo-
sion.
Check test nipple A for tight-
ness.
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