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Parameters
10 .6 .4 Low fire over-run
Parameter 43
The low fire over-run (t
a pneumatic air/gas ratio control system and On/Off
control. Using the low fire over-run function reduces
the O
content in the furnace atmosphere.
2
A8
Parameter 43 = 0: Off. No low fire over-run is performed.
The gas circuit is closed immediately owing to a quick
closing gas valve in the case of On/Off control. The air
circuit is closed more slowly. The air flowing in during
this time increases the O
chamber.
Parameter 43 = 1 (only for BCU..F1/F2): up to minimum
capacity. The burner is not immediately switched off af-
ter the start-up signal ϑ (terminal 1) has been removed.
During low fire over-run, the control element is moved
to the position for minimum capacity and the gas valves
remain open until the flame fails or the position for min-
BCU 580 · Edition 11.15l
) is applicable to systems with
KN
00
88
11
L1
46
1
ϑ
9
5
13
V1
14
V2
57
V4
2
A
10
41
42
1
43
2
t
t
KN
content in the combustion
2
imum capacity is reached. If the flame is extinguished,
this does not result in a fault.
Parameter 43 = 2, 3, 4, 5, 10, 20, 30 or 40 (only for BCU..
F3): time in seconds. During this time, the gas valve
remains open. The air valve is closed with deactivated
start-up signal (ϑ).
V1
VAS
BCU 580..F3
µC
13
14
57
9
8
5
10
This means that the burner is initially adjusted down
to low fire and then switched off completely. Flame
control is still operational. It must be ensured that no
excess gas occurs.
V2
VAG
V4
VAS 1
VR..L
TZI/TGI
85
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