GB-21
D
GB
F
NL
I
E
Pa-
ram-
eter
Name
Values
79
Pilot burner operation
0
= With shut-down
1
= Continuous operation
80
Fieldbus communication
0
= Off
1
= With address check
2
= No address check
93
Pre-ignition time
0 – 5
= Time in seconds
94
Safety time 1 t
SA1
2, 3, 5, 10
= Time in seconds
95
Flame proving period 1 t
FS1
0 – 20
= Time in seconds
96
Safety time 2 t
SA2
2, 3, 5, 10
= Time in seconds
97
Flame proving period 2 t
FS2
0 – 20
= Time in seconds
▷
Additional parameters for BCU 570..F2
Pa-
ram-
eter
Name
Values
41
Running time selection
0
= Off; checking the positions for min./max.
capacity
1
= On; for approaching the positions for min./
max. capacity
2
= On; for approaching the position for maximum
capacity
3
= On; for approaching the position for minimum
capacity
42
Running time
0 – 250
=
Running time in seconds, if
parameter 41 = 1, 2 or 3
▷
Additional parameters for BCU 570..C1
Pa-
ram-
eter
Name
Values
51
Valve proving system
0
= Off
1
= Tightness test before start-up
2
= Tightness test after shut-down
3
= Tightness test before start-up and after shut-
down
4
= Proof of closure function
52
Relief valve
2
= V2
3
= V3
4
= V4
56
Measurement time V
p1
3
= Time in seconds
5 – 25
= (in 5 s steps)
30 – 3600
= (in 10 s steps)
59
Valve opening time 1 t
L1
2 – 25
= Time in seconds
Legend
Ready for operation
Safety interlocks (limits)
HT
High temperature operation
Gas valve
Air valve
Air/gas ratio control valve
Burner
P
Purge
Controlled air flow
Burner operating signal
ϑ
Start-up signal (BCU)
Emergency stop
PZ
Pressure switch for valve check (TC)
PZH
Pressure switch for maximum pressure
PZL
Pressure switch for minimum pressure
PDZ
Differential pressure switch
P xx
Input signal
depending on parameter xx
M
Control element with butterfly valve
TC
Valve check (tightness test)
p
u
/2
Half of the inlet pressure
p
d
Outlet pressure
GZL
Valve with proof of closure switch
Input/Output, safety circuit
