47
Combustion chamber pressure monitoring function (LDW2)
C
B
To monitor the combustion chamber
pressure, the switching threshold of air
pressure switch 2 (LDW2) is monitored
in all operating phases (except during
safety and stabilising time).
Air pressure switch
C
triggers a fault
shutdown at the burner control unit under
the following circumstances:
■ If the combustion chamber pressure is
outside the permissible range in the
pre-purge phase, in control mode or in
the post-purge phase after 2 attempts.
The fault shutdown is shown with fault
indicator "F FB" on the burner control unit
display (see page 48) and can be reset
by pressing reset button
B
.
Rated
heating
output
Rated
heat in-
put
LDW2 set val-
ue
P
max
(50/30 °C)
Q
max
(H
i
)
[net cv]
in kW
in kW in mbar (kPa)
400
381
5 (0.5)↑
500
474
620
593
Air pressure switch
Air pressure switch
(cont.)
5794 780 GB
Summary of Contents for 7502860
Page 95: ...95 5794 780 GB ...
