BCU 480 · Edition 03.16l 8
t
1
2
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
A
P
5
3
DI
6
04 02–04 06–08 06–08
04
µC
ϑ
1
ϑ
2
ϑ
1
ϑ
2
VR..R
VAG
VBY
2
1
Application
1.1.2
Stage-controlled main burner
with permanent 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. Pilot and main burn-
ers can be operated simultaneously.
This reduces the time required by
the main burner for starting up.
The BCU provides the cooling and
purging processes.
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