Viessmann GS1, Service Instructions Manual

Page: 6 / 36

6
Initial start−up, inspection and maintenance
Further details regarding the individual steps
(cont.)
Checking gas type
1. Enquire the gas type and Wobbe
index(Wo) from your local mains
gas or LPG supplier.
Note
The boiler is set up in the factory
for natural gas E.
The boiler can be operated
in the Wobbe index range
12.0 to 16.1kWh/m
3
(43.2 to 58.0MJ/m
3
).
2. Compare the gas category (gas
type) and gas group with the
details on the burner label.
3. The burner must be converted
according to the details provided
by the mains gas or the LPG
supplier to match the fuel
provided, if these details do
not match.
Installation instructions
Conversion kit
After conversion from
H Natural gasE to natural gasLL:
This boiler can be operated
in the Wobbe index range
10.0 to 13.1kWh/m
3
(36.0 to 47.2MJ/m
3
).
H Natural gasE to LPGP:
The boiler can be operated
in the Wobbe index range
21.4 to 22.5kWh/m
3
(76.9 to 81.0MJ/m
3
).
4. Record the gas type in the service
report from page26.
5692413GB