Viessmann Vitodens 200-W Series Installation And Service Instructions Manual page 28

Commissioning, inspection, maintenance
Checking the static and supply pressure
A
Fig. 22
Supply (flow) pressure
for natural gas
Below 15 mbar (1.5 kPa)
15 to 25 mbar (1.5 to
2.5 kPa)
Above 25 mbar (2.5 kPa)
28
Supply (flow) pressure
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.)
1. Close the gas shut-off valve.
2. Undo screw inside test nipple "PE" on the gas
A
train, but do not remove it, and connect the pres-
sure gauge.
3. Open the gas shut-off valve.
4. Check the static pressure and record the actual
value in the report on page 112.
Set value: max. 57.5 mbar (5.75 kPa).
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 R to reset the burner.
6. Check the supply (flow) pressure. Set values:
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.
7. Record the actual value in the service report.
Take the action 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. Danger
Gas escaping from the test nipple leads to a
risk of explosion.
Check for gas tightness.
Open the gas shut-off valve, start the boiler and
check for tightness at test nipple
Action
Do not start the boiler. Notify your gas supply utility or
LPG supplier.
Start the boiler.
Position a separate gas pressure governor upstream of
the system and regulate the pre-charge pressure to
20 mbar (2 kPa) for natural gas or 50 mbar (5 kPa) for
LPG. Notify your gas supply utility or LPG supplier.
.
A