BCU 580 · Edition 11.15l 92
Parameters
Parameter 75 = 3: IGNITION to MAX. capacity; standby
in CLOSED position.
The control range while the burner is operating is be-
tween the positions for minimum capacity (S1) and
maximum capacity (S3). The burner is ignited in the
position for minimum capacity (S1). When the burner is
switched off, the actuator is moved to the closed posi-
tion (S4).
This operating mode can be achieved with an actuator
IC 20, RBW or alternatively with a comparable three-
point step actuator.
If the air supply is stopped on a heated furnace with
the burner switched off, the controls are protected
from the hot furnace atmosphere as a result of the
butterfly valve being in the closed position (limited
by S4). Check whether the burner can cope without
cooling in this situation.
IC 20
Switching cam setting for ignition capacity, minimum and maximum capacity
as well as pre-purge and standby:
S1: for minimum capacity and ignition capacity of the burner.
S3: for maximum capacity of the burner and pre-purge.
S4: for the closed position of the butterfly valve and standby.
0° 90°
S4
S1 S3
Move to ignition position
Burner control range
CLOSED
IGNITION
Butterfly valve setting range
Control range
Ignition pos. Max. pos.
OPEN
Min.
pos.
Closed
pos.
MIN MAX
MAX
PE
L1
N
3 2 116 67 4812 1115 13
S3 S4
S11
S10
0°
90°
M
IC 20
PE
S1S2
90°➔0°
0°➔90°
S1
Min Max
Y-
Y+
53 54 55 56
52
65 66 67 68
49 50 51
17 18 37 38
13 14 15
BCU 580..F1
µC
88
c
c
41 42
24V
DC
5 6 9 11 1210762 61
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