Honeywell Krom Schroeder BCU 480 - Third Gas Valve (Can be Shut Down) on BCU

BCU 480 · Edition 03.16l 66
BCU 480
12
23
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
VBY
µC
ϑ 1 ϑ 2
t
1
2
04 02–04 06–08 06–08
04
ϑ 1
ϑ 2
2
1
BV
IC 40
4
7
M
14
26
50 51
VAG
VAS
Project planning information
6.18 Third gas valve (can be
shut down) on BCU..L
Units with air valve control have an
additional contact (terminal), which
closes at the same time as the air
valve.
This can be used to activate a third
gas valve (V3). To do this, the output
of valve V1 or V2 must be used as
auxiliary energy (as a result of the
required flame control).
13
N
14 15
50 51
V3 V2
The opposite application describes
a two-stage-controlled burner
without a pneumatic air/gas ratio
control system. The third gas valve
(V3) and the air valve are activated
simultaneously. During purging/
cooling, the gas valve (V3) is not
activated.