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Parameters
4 .8 Manual mode
For convenient setting of the burner or analyzing faults.
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.
In this operating mode, the burner control unit oper-
ates independently of the status of the inputs Start-up
signal (ϑ) (terminal 21), Controlled air flow (terminal
22) and Remote reset (terminal 23) as well as the bus
inputs on BCU..B1. The functions of the safety interlock
(terminal 24) are retained.
Each time after the button is pressed again, the BCU
moves to the next section of the program sequence and
stops there. After approx. 3 seconds, the flame signal is
indicated instead of the operating status. In the event
of flame simulation, the flame signal will be displayed
immediately.
Following controller enable (status display 08 ), a con-
nected butterfly valve can be opened and closed as re-
quired. By holding the button, the motor is first opened
further. The BCU indicates A. 1 . , with blinking dots. Once
the button has been released, the butterfly valve stops
in the relevant position. If the button is pressed again,
the butterfly valve is closed (Closed position). The BCU
indicates A.0. , with blinking dots. A change of direc-
tion takes place each time the button is released and
pressed again.
BCU 370 · Edition 01.19
When the butterfly valve has reached its final position,
the dots disappear.
4 .8 .1 Operating time in Manual mode
Parameter 16
Determines whether the BCU in Manual mode is reset
to the standby position for Manual mode.
Parameter 16 = 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.
Parameter 16 = 1: five minutes after the last time the
button is pressed, the BCU ends burner operation and
moves abruptly back to the standby position for Manual
mode. The burner can be restarted manually.
Manual mode is terminated by switching off the BCU or
in the event of a power failure.
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