7
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
boilers 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 boilers 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 to the other gas
type in accordance with details provi-
ded by your gas supply utility (see
page 7).
3.
Record the gas type in the report (on
page 45).
Conversion to natural gas LL
(not in
a
and
c
)
C
B
A
0
1.
Close the gas shut-off valve.
0
2.
Switch OFF the control unit ON/OFF
switch.
0
3.
Switch OFF the main isolator (out-
side the installation room) or the
power supply and prevent unauthor-
ised reconnection.
0
4.
Release the cable fixings on the gas
pipe.
0
5.
Release compression fittings
A
and
C
remove the gas pipe.
0
6.
Unscrew gas restrictor
B
.
0
7.
Take gas restrictor
B
for natural
gas LL from the pack supplied and
screw on (for diameter see table on
page 46).
Commissioning, inspection, maintenance
Further details regarding the individual steps
(cont.)
5692 488 GB
