FCU 500, FCU 505 · Edition 02.17
114
Parameters
12 .7 Manual mode
If the Reset/Information button is pressed for 2 s dur-
ing switch-on, the FCU reverts to Manual mode. Two
dots blink on the display. The FCU is now operating in
Manual mode independently of the status of the inputs
of the start-up signal (terminal 1), controlled air flow
(terminal 2) and remote reset (terminal 3). The function
of the controller enable/emergency stop input (ter-
minal 46) is retained. The manual start-up of the FCU
can be started in Manual mode by pressing the Reset/
Information button. Each time the button is pressed
again, the FCU moves to the next step of the program
sequence and stops there, for example for adjusting a
butterfly valve or the gas/air mixture.
Actuator IC 20, IC 40, 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 FCU 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
FCU 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.
Frequency converter
Following controller enable (status display
08
), the fre-
quency converter can be set to the speed for maximum
air volume or minimum air volume (pilot air volume) by
pressing the button.
12 .7 .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 fur-
nace may be continued manually in the event of failure
of the control system or the bus.
Parameter 67 = 1: the FCU 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 FCU will be terminated regardless
of parameter 67.
