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Parameters
10 .9 Manual mode
If the Reset/Information button is pressed for 2 s dur-
ing 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 controller 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 button is pressed again, the BCU moves to the next
step of the program sequence and stops there, for ex-
ample for adjusting an actuator or the gas/air mixture.
Actuator IC 20, IC 40 and RBW
Following controller enable (status display 08 ), a con-
nected actuator can be opened and closed as required.
By holding the button, the actuator is first opened fur-
ther. 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 direc-
tion takes place each time the button is released and
pressed again. When the actuator has reached its final
position, the dots disappear.
BCU 580 · Edition 11.15l
10 .9 .1 Operating time in Manual mode
Parameter 67
Parameter 67 determines when Manual mode is termi-
nated.
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 fail-
ure of the control system or the bus activation.
Parameter 67 = 1: the BCU will terminate Manual mode
5 minutes 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 parameter 67.
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