Viessmann VITODENS 100-W Installation And Service Instructions Manual page 31

Checking the static pressure and supply pressure
Fig. 19
Supply pressure (flow pressure)
For natural gas
< 20 mbar (2.0 kPa)
20 - 25 mbar (2.0 - 2.5 kPa)
> 25 mbar (2.5 kPa)
01. Turn off the ON/OFF switch.
02. Close the gas shut-off valve.
03. Undo screw
solenoid valve, but do not remove it. Connect the
pressure gauge.
04. Open the gas shut-off valve.
05. Measure the static pressure and record it in the
report.
Set value: Max. 57.5 mbar (5.75 kPa).
06. Turn on the ON/OFF switch and start the boiler.
Note
During commissioning, the appliance can enter a
fault state if there are airlocks in the gas line.
Reset the appliance after approx. 5 s (see operat-
ing instructions).
07. Measure the supply (flow) pressure. For set val-
A
ues, see the following table.
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 measured value in the report.
Implement measures as indicated in the table
below.
09. Shut down the boiler. Close the gas shut-off valve.
Remove the pressure gauge. Close test
connector
10. Open the gas shut-off valve and start the appli-
ance.
11. Fit front panel (see installation sequence).
Measures
Do not start the boiler. Notify the gas supply utility.
Start the boiler.
Connect a separate gas pressure governor upstream of the system. Set
the pre-charge pressure to 20 mbar (2.0 kPa) for natural gas. Notify the
gas supply utility.
Commissioning, inspection, maintenance
(cont.)
inside test connector on the gas
A
with the screw.
A
Danger
Gas escaping from the test connector leads
to a risk of explosion.
Check gas tightness at test connector .
A
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