4. Record the gas type in the service
report on page 123.
Wobbe index ranges
Gas type Wobbe index range
kWh/m
3
MJ/m
3
Delivered condition
Natural gas E
GZ 50
12.0 to 16.1 43.2 to 58.0
After conversion
Natural gas LL 10.0 to 13.1 36.0 to 47.2
Natural gas L
S
GZ 35
8.45 to 10.0 36.0 to 47.2
Natural gas L
W
GZ 41.5
9.86 to 12.0 35.5 to 43.4
Natural gas S 10.1 to 11.55 36.3 to 41.6
LPG P 20.3 to 21.3 72.9 to 76.8
Function sequence and possible faults
Display screen Measures
Control unit is-
sues heat de-
mand
No
Increase set
value and ensure
heat is drawn off
Yes
Fan starts
No
after approx.
200 s fault F9
Check the fan, fan
connecting
cables, power at
the fan and fan
control
Yes
Air pressure
switch enables
start (contact
closed across
terminals "X8.10"
and "X8.11")
No
after approx.
200 s fault E6
Check the ba-
lanced flue sys-
tem and the air
pressure switch
Further details regarding the individual steps (cont.)
23
Commissioning, inspection, maintenance
5592 817 GB
Service
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