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Parameters
10 .4 .2 Minimum operating time t
Parameter 61
A minimum operating time (0 to 250 s) may be defined
to ensure that the heating equipment operates stably.
If the minimum operating time is active, burner opera-
tion will be maintained until the set time has elapsed
even if the start-up signal fails.
The minimum operating time starts as soon as the pro-
gram step for operation/controller enable (display 08)
has been reached.
If the start-up signal drops out before the start of op-
eration/controller enable, e.g. during pre-purge, the
burner control unit reverts directly to the start-up posi-
tion (standby) and the burner is not ignited.
The minimum operating time can be cancelled by
switching off the BCU or if a safety shut-down occurs.
BCU 580 · Edition 11.15l
B
10 .4 .3 Pilot burner
Parameter 79
00
02
03
04
t
t
SA1
FS1
If a burner with a pilot burner is used, this parameter
can be used to define whether the pilot burner is shut
down 1 second before the end of the second safety
time t
or operates continuously.
SA2
Parameter 79 = 0: with shut-down.
Parameter 79 = 1: in continuous operation.
88
06
07
08
1
4
9
13
14
15
P79 = 1
57
t
t
SA2
FS2
ϑ1
ϑ2
V1
V2
V3
V4
t
73
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