GB-25
D
GB
F
NL
I
E
Reading off the flame signal, fault
messages and parameters
▷
If the unit is switched on, information about the
flame signal intensity, the last 10 event messages
(e.g. Power ON, error E002) and the parameter
values can be read off by repeatedly pressing
the Reset/Information button.
Display
Information
F1
F2
*
Flame signal intensity:
Burner 1
Burner 2*
H0
to
H9
Last event message
to
tenth to last event message
001
to
999
Parameter 001
to
parameter 999
* Only on BCU 480
•
Press the Reset/Information button for approx.
2 s until the display indicates
F1
.
•
Release the button. The display indicates the
flame signal intensity in µA.
•
Press the Reset/Information button again for
2 s to go to the next item of information (event
message, parameter value).
▷
Each time the button is released, the corre-
sponding event message or parameter value
is displayed.
▷
To go to one of the last event messages or to a
parameter more quickly, hold the Reset/Infor-
mation button pressed down for longer (≥ 2 s).
▷
If the button is pressed briefly, the display indi-
cates what parameter number is currently being
displayed.
▷
The normal program status is displayed again
approx. 60 seconds after the last time the but-
ton is pressed.
▷
For the parameters and the corresponding val-
ues, see Technical Information bulletins BCU 46x
and BCU 480.
Parameters and values
Application parameters
Param-
eter No.
Parameter name
Parameter value
A001
Switch-off threshold 1
2 – 20
= µA
A002
Switch-off threshold 2
2 – 20
= µA
A003
Flame simulation check
0
= In standby
1
= Upon start-up
A006
High temperature operation
0
= Off
2
= Burner 1 UVS Burner 2 UVS
3
= Continuous operation
6
= Burner 1 UVS Burner 2 ionization
A007
Burner 1 start-up attempts
1
= 1 start-up attempt
2
= 2 start-up attempts
3
= 3 start-up attempts
A008
Burner 2 start-up attempts
1
= 1 start-up attempt
2
= 2 start-up attempts
3
= 3 start-up attempts
A009
Restart
0
= Off
1
= Burner 1
2
= Burner 2
3
= Burner 1 and burner 2 (pilot and main burners)
4
= Max. 5 times in 15 min. for burner 1
5
= Max. 5 times in 15 min. for burner 2
6
= Max. 5 times in 15 min. for burners 1 and 2
A016
Low air pressure protection delay
0
= Off
1
= On
A019
Safety time operation
0
;
1
;
2
;
3
;
4
= Time in seconds
A028
Pre-ventilation/flameless
0 – 250
= Time in seconds
A029
Cooling priority
0
= Start-up overrides cooling
1
= Cooling overrides start-up
A030
Staged cooling
0
= Start-up overrides cooling
1
= Stage 2 via signal at terminal 5
2
= After delay time
A031
Staged cooling delay
0 – 6000
= Time in seconds
A034
Pre-purge time t
PV
0 – 6000
= Time in seconds
A036
Pre-ventilation
0 – 250
= Time in seconds
A039
Over-run time
0 – 60
= Time in seconds
A041
Running time selection
0
= Off; position check
1
= On; for min./max. capacity
2
= On; for maximum capacity
3
= On; for minimum capacity
A042
Running time
0 – 250
= Time in seconds