Viessmann VITODENS 333, Service Instructions Manual

Page: 12 / 132

Yes
Operational bur-
ner Stops below set
boiler tempera-
ture and immedi-
ately restarts
again Check flue gas
system for sound-
ness (flue gas
recirculation),
check gas flow
pressure
Checking the gas type
1. Enquire about the gas type and
Wobbe index (Wo) from your local
mains gas or LPG supplier.
Note
In the as delivered condition, Vito-
dens 333 is set up for natural gas
E.
The boiler can be operated in the
Wobbe index range 12.0 to
16.1 kWh/m
3
(43.2 to 58.0 MJ/m
3
).
2. Compare the gas category (gas
type) and gas group with the details
on the burner label.
3. If these details do not match the
fuel provided, the burner must be
converted according to the details
provided by the mains gas or the
LPG supplier.
See separate conversion kit
installation instructions.
After conversion to
&
Natural gas LL
The boiler can be operated in the
Wobbe index range 10.0 to
13.1 kWh/m
3
(36.0 to 47.2 MJ/
m
3
).
&
LPG P
The boiler can be operated in the
Wobbe index range 21.4 to
22.5 kWh/m
3
(76.9 to 81.0 MJ/
m
3
).
4. Set the gas type via coding
address 1E at the control unit.
Note
To call up code 1 and for setting the
coding address, see page 39.
Further details regarding the individual steps
(cont.)
12
Initial start-up, inspection, maintenance
56
92
548
GB