BCU 580 · Edition 11.15l
109
Project planning information
12 .5 Parameter chip card
The parameter chip card must be installed in the unit for
the BCU to operate. The parameter chip card contains
the valid parameter settings for the BCU. If a BCU is
replaced, the parameter chip card can be removed from
the old unit and inserted into the new BCU. The BCU
must be disconnected from the electrical power supply
for this purpose. The valid parameters are then adopted
by the new BCU. The old device and the new BCU must
have an identical type code.
12 .6 Protecting the pilot burner from
overload
To protect the unit against overload by frequent cycling,
only a specific number of pilot burner start-up attempts
can be carried out by the BCU. The maximum number
of start-up attempts per minute depends on the safety
time t
SA
and the ignition time t
Z
.
t
SA
[s]
t
Z
[s]
Cycle lock
[s]
3
2
12
5
3
13
10
6
16
If too many start-up attempts are made,
53
flashes on
the display to indicate a fault.