Viessmann VITOCROSSAL 200 Service Instructions Manual page 12

Commissioning, inspection, maintenance
Further details regarding the individual steps
Supply pressure
1. Start the burner.
Note
For commissioning, see page 8.
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 12.
Note
The supply pressure (flow pres-
sure) should be between 20 and 50
mbar. The gas pressure limiter
minimum (GDW 1) is factory-set to
10 mbar. Never alter this setting.
Supply pressure Remedy
(flow pressure)
below 15 mbar Make no adjustments and contact the gas supply utility
15 to 20 mbar Please note: The boiler may only be operated temporarily
with these settings (emergency mode).
Notify your gas supply utility.
20 to 50 mbar Start the boiler
above 50 mbar Install a separate gas pressure governor with zero off up-
stream in the boiler system, and regulate the pressure to 20
mbar.
Notify your gas supply utility.
12
(cont.)
3. Record the actual value in the
report (on page 61).
4. Close the gas shut-off valve.
5. Remove the pressure tester and
close test connector A.