Viessmann Vitodens 222-F Installation Instructions For Contractors page 30

Commissioning, inspection, maintenance
Checking the static pressure and supply pressure
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Fig. 23
01. Close the gas shut-off valve.
02. Remove the cover panel; see page 27.
03. Undo screw inside test connector "PE" on the
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gas train, but do not remove it, and connect the
pressure gauge.
04. Open the gas shut-off valve.
Supply pressure (flow pressure)
For natural gas
Below 17 mbar (1.70 kPa)
17 to 25 mbar
(1.70 to 2.5 kPa)
Above 25 mbar (2.5 kPa)
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For LPG
Below 42.5 mbar
(4.25 kPa)
42.5 to 57.5 mbar
(4.25 to 5.75 kPa)
Above 57.5 mbar
(5.75 kPa)
(cont.)
05. Check the static pressure and record the actual
value in the report on page 103.
Set value: max. 57.5 mbar (5.75 kPa).
06. Start the boiler.
Note
During commissioning, the boiler can enter a fault
state (fault EE is displayed) because of air in the
gas line. After approx. 5 s, press reset button R to
reset the burner.
07. Check the supply (flow) pressure.
Set value:
■ Natural gas: 20 mbar (2 kPa)
■ LPG: 50 mbar (5 kPa)
Note
Use a suitable measuring device with a resolution
of at least 0.1 mbar (0.01 kPa) to check the supply
pressure.
08. Record the actual value in the report on
page 103.
Implement measures as indicated in the table
below.
09. Shut down the boiler, close the gas shut-off valve,
remove the pressure gauge and close test con-
nector with the screw.
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10. Open the gas shut-off valve and start the appli-
ance.
Danger
Gas escaping from the test connector leads
to a risk of explosion.
Check gas tightness at test connector
11. Remount the cover panel.
Steps
Do not commission the boiler. Notify the gas supply util-
ity or LPG supplier.
Start the boiler.
Install a separate gas pressure governor upstream of
the system and set the charge pressure to 20 mbar
(2.0 kPa) for natural gas or 50 mbar (5.0 kPa) for LPG.
Notify your gas supply utility or LPG supplier.
.
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