Viessmann VITODENS 242-F Installation And Service Instructions Manual page 54

Commissioning, inspection, maintenance
Further details regarding the individual steps
A
1. Close the gas shut-off valve.
2. Loosen the screw inside test connec-
tor "PE" A at 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
the actual value in the report on
page 193.
Set value: max. 57.5 mbar
(5.75 kPa).
5. Start the boiler.
Note
During commissioning, the boiler can
enter a fault state (fault EE is dis-
played) because of air in the gas line.
After approx. 5 s, press reset button
R (see operating instructions) to reset
the burner.
54
(cont.)
6. Check the supply (flow) pressure.
Set value:
■ Natural gas: 20 mbar (2.0 kPa)
■ LPG: 50 mbar (5.0 kPa)
Note
Use a suitable measuring device with
a resolution of at least 0.1 mbar
(0.01 kPa) to check the supply pres-
sure.
7. Record the actual value in the report
on page 193.
Take action as shown in the following
table.
8. Shut down the boiler, close the gas
shut-off valve, remove the pressure
gauge and tighten the screw in test
connector 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 gas tightness at test
connector A.