11
1.
Check with your gas supply utility regarding the
gas type and Wobbe index Ws (0 °C).
■
With the natural gas H/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 L/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 AT and
CH).
■
186 to 311 kW rated heating output only: With
the LPG P setting, the boilers can be operated in
the Wobbe index range 21.3 to 22.5 kWh/m
3
(76.9 to 81.2 MJ/m
3
).
2.
In the delivered condition, the burner is set up for
natural gas H/E. If necessary, convert the burner to
the gas type on site. Observe the information provi-
ded by the gas supply utility.
3.
Record the gas type in the report in the appendix
on page 56.
Conversion to natural gas L
Conversion at rated heating output
≤
87 kW
F
C
D
E
A
B
Fig. 2
0
1.
Close the gas shut-off valve.
0
2.
Switch off the system ON/OFF switch at the user
interface of the control unit.
0
3.
Switch OFF the mains isolator (outside the instal-
lation room) or isolate the mains power and
secure against unintentional reconnection.
0
4.
Undo fitting
A
.
0
5.
Release gas train
B
from flange
C
and remove
the control cable.
0
6.
Remove restrictor
D
with O-ring
E
from flange
C
.
0
7.
Secure gas train with O-ring
E
to flange
C
and
fit the control cable to the partial load controller.
Restrictor
D
is no longer required.
0
8.
Secure fitting
A
.
0
9.
Where present for set gas type: Affix label "Set
to ..."
F
supplied over the existing label.
10.
Check control cables:
■
Connection and kink-free routing
■
Application and seating of retaining clips
11.
Switch on the system ON/OFF switch at the user
interface of the control unit. Start the burner.
12.
Check for gas tightness.
Danger
Escaping gas leads to a risk of explosion.
Check gas routing components for leaks.
!
Please note
The use of leak detection spray can result in
faulty operation.
Leak detection spray must not come into
contact with electrical contacts.
Note
For control cable locations, see page 27.
Commissioning, inspection, maintenance
Checking the gas type
5831036