11
Checking the gas type
1.
Determine the gas type and Wobbe
index (Wo) from your gas supply util-
ity.
■ With the natural gas E setting, 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
).
■ With the natural gas LL setting, 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
)
(not in
a
and
c
).
2.
In the delivered condition, the burner
is set up for natural gas E. If required,
convert the burner in accordance with
details provided by your gas supply
utility to a different gas type (see
page 11).
3.
Record the gas type in the service
report (on page 65).
Conversion to natural gas LL
(not in
a
and
c
)
0
1.
Close the gas shut-off valve.
0
2.
Switch OFF the control unit ON/OFF
switch.
0
3.
Switch OFF the mains isolator (out-
side the installation room) or the
power supply and prevent unauthor-
ised reconnection.
0
4.
Pull cables from gas train.
0
5.
Undo fitting
A
.
A
B
C
D
G
F
E
0
6.
Pull compensation hose
G
from
gas train.
Commissioning, inspection, maintenance
Further details regarding the individual steps
(cont.)
5692 908 GB
