Viessmann Vitocrossal 200 Service Instructions For Contractors page 14

Commissioning, inspection, maintenance
Checking static pressure and supply pressure
Supply pressure
1. Start the burner.
Note
Commissioning: switch burner to max. heating out-
put. Activate the emissions test switch at the con-
trol unit.
2. Check the supply pressure (flow pressure); see the
following table.
Note
The supply pressure (flow pressure) should be
between 18 and 50 mbar (1.8 to 5 kPa). The gas
pressure switch is factory set to 10 mbar (1 kPa).
Never alter this setting.
Supply pressure
(flow pressure)
Below 15 mbar (1.5 kPa)
15 to 18 mbar (1.5 to
1.8 kPa)
18 to 50 mbar (1.8 to
5 kPa)
Above 50 mbar (5 kPa)
14
Action
Do not adjust any settings. Notify your gas supply utility.
Please note: the boiler may only be operated temporarily with this setting (emergency
mode).
Notify your gas supply utility.
Start the boiler.
Install a separate gas pressure governor with zero off upstream of the boiler system.
Regulate the pressure to 20 mbar (2 kPa).
Notify your gas supply utility.
(cont.)
3. Record the actual value in the report (on
page 57).
4. Close the gas shut-off valve.
5. Remove the pressure tester and close test connec-
tor .
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