BCU 580 · Edition 11.15
93
10 .9 Manual mode
If the Reset/Information button is pressed for 2 s during
switch-on, the BCU reverts to Manual mode. Two dots blink
on the display. The BCU is now operating in Manual mode
independently of the status of the inputs of the burner 1 start-
up signal (terminal 1), controlled air flow (terminal 2), remote
reset (terminal 3) and the burner 2 start-up signal (terminal 4).
The functions of the safety-relevant inputs such as control-
ler enable/emergency stop (terminal 46) are retained. The
manual start-up of the BCU can be initiated in Manual mode
by pressing the Reset/Information button. Each time the but-
ton is pressed again, the BCU moves to the next step of the
program sequence and stops there, for example for adjusting
an actuator or the gas/air mixture.
Actuator IC 20, IC 40 and RBW
Following controller enable (status display
08
), a connected
actuator can be opened and closed as required. By holding the
button, the actuator is first opened further. The BCU indicates
A
with blinking dots. Once the button has been released,
the actuator stops in the relevant position. Pressing it again
will result in closing the actuator to the position for minimum
capacity. The BCU indicates
A
with blinking dots. A change
of direction takes place each time the button is released and
pressed again. When the actuator has reached its final posi-
tion, the dots disappear.
10 .9 .1 Operating time in Manual mode
Parameter 67
Parameter 67 determines when Manual mode is terminated.
Parameter 67 = 0: Manual mode is not limited in time.
If this function has been selected, operation of the burner may
be continued manually in the event of failure of the control
system or the bus activation.
Parameter 67 = 1: the BCU will terminate Manual mode 5 min-
utes after the last time the button is pressed. It then moves
abruptly back to the start-up position (standby).
If the unit is switched off or a power failure occurs, Manual
mode on the BCU will be terminated regardless of param-
eter 67.
Parameters
