BCU 480 · Edition 03.16l 7
BCU 480
14
12
23
26
SPS
PLC
API
DI
L1, N, PE
P
22 4
21
18
19
16
17
28
29
24
2
1
t
1
2
A
P
5
3
DI
6
02–04 02–04 06–08 06–08
ϑ
2
ϑ
1
ϑ
1
ϑ
2
µC
VR..L
VAG
UV
VBY
2
1
Application
1.1 Examples of application
1.1.1
Stage-controlled main burner
with alternating pilot burner
Control:
Main burner ON/OFF.
The main burner can be started with
reduced capacity after the operat-
ing signal from the pilot burner has
been detected. The pilot burner is
switched off automatically after the
main burner has started up. When
the main burner is switched off, the
pilot burner automatically switches
on again. This reduces the main
burner start-up time.
A UV sensor monitors the flame sig-
nal from pilot and main burners. UV
sensor UVD 1 is used for continu-
ous operation, UV sensor UVS for
intermittent operation.
The BCU provides the cooling and
purging processes.
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