Checking The Gas Type; Changing The Gas Type (If Required) - Viessmann VITOGAS 100-F Service Instructions Manual

Further details regarding the individual steps
4. Fill the heating system with water and
vent until the fill pressure indicated at
pressure gauge A is 0.1 to 0.2 bar
higher than the pre-charge pressure
of the diaphragm expansion vessel.
Minimum system pressure 0.8 bar;
permissible operating pressure
3 bar.

Checking the gas type

Note
The boiler is preset in the factory for nat-
ural gas E.
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.
Wobbe index ranges
Gas type
Delivered condition
Natural gas E
After conversion
LPG P

Changing the gas type (if required)

Conversion kit installation
instructions
Commissioning, inspection, maintenance
5. Return the check valves to their oper-
ating position.
2. If the details do not match, convert
the burner to the available gas type,
in accordance with the information
provided by the gas supply utility or
the LPG supplier.
Conversion kit installation
instructions
3. Record the gas type in the report on
page 28.
Wobbe index range Ws
3
kWh/m
12.0 to 16.1
20.3 to 21.3
(cont.)
3
MJ/m
43.2 to 58.0
72.9 to 76.8
7