Checking The Gas Type - Viessmann Vitogas 200-F GS2 Service Instructions Manual

Further details regarding the individual steps
Safety equipment block for 108 to
144 kW
A Pressure gauge
1. Check that the installation room vent
is open.
2. Check the pre-charge pressure of the
expansion vessel.
If the pre-charge pressure of the
expansion vessel is lower than the
static system pressure, top up with
sufficient nitrogen to make the pre-
charge pressure higher than the
static system pressure (0.1 to
0.2 bar/10 to 20 kPa).

Checking the gas type

The boiler is factory set for
natural gas E.
Note
The boiler can be operated in the Wobbe
index range 12.0 to 16.1 kWh/m
3
to 58.0 MJ/m ).
Commissioning, inspection, maintenance
3. Open any installed check valves.
4. Fill the heating system with water and
vent it until the charge pressure at the
pressure gauge is higher than the
pre-charge pressure of the expan-
sion vessel (0.1 to 0.2 bar/10 to
20 kPa).
Minimum system pressure 0.8 bar
(8 kPa), permiss. operating pressure
3 bar (0.3 MPa).
5. Return the check valves to their oper-
ating position.
1. Check the gas type and Wobbe index
with your gas supply utility or your
LPG supplier and compare them with
the details on the burner label.
3
(43.2
(cont.)
9