Viessmann VITOCROSSAL 200 Service Instructions Manual page 13

Further details regarding the individual steps
Supply pressure
1. Start the burner.
Note
For commissioning, see page 9.
Switch the burner to maximum out-
put. For this, activate the emissions
test switch at the control unit.
2. Check the supply pressure (flow
pressure), see table on page 13.
Note
The supply pressure (flow pressure)
must be between 18 and 50 mbar
(nominal 20 mbar). The gas pressure
limiter minimum (GDW 1) is factory-
set to 10 mbar. Never alter this set-
ting.
Supply pressure
(flow pressure)
Below 15 mbar
15 to 18 mbar
18 to 50 mbar
Above 50 mbar
Measure
Make no adjustments and contact the gas supply utility.
Please note: The boiler may only be operated temporarily with
these settings (emergency mode).
Notify your gas supply utility.
Start the boiler.
Install a separate gas pressure governor with zero off upstream
in the boiler system, and regulate the pressure to 20 mbar.
Notify your gas supply utility.
Commissioning, inspection, maintenance
3. Record the actual value in the report
(on page 65).
4. Close the gas shut-off valve.
5. Remove the pressure tester and
close test nipple A.
(cont.)
13