Behaviour During Start-Up; Minimum Pause Time T Mp; Manual Mode; Operating Time In Manual Mode - Honeywell BCU 460 Technical Information

Parameters

11 .10 Behaviour during start-up

11 .10 .1 Minimum pause time t
Parameter A062
A minimum pause time t
to achieve stable operation of the burners. If the over-
run time set using parameter A039 has elapsed and no
signal (ϑ) is received at terminal 1 (burner shut down), a
restart and cooling are prevented for the duration of the
minimum pause time t
If a signal is applied to terminal 1 (burner start-up) or
terminal 2 (cooling) during the minimum pause time,
status display Delay H0 will appear.

11 .11 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 start-up signal (terminal 1), controlled air flow
(terminal 4) and remote reset (terminal 2). The func-
tions of the safety-relevant inputs such as controller
enable/emergency stop (terminal 35) 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
example for adjusting an actuator or the gas/air mix-
ture.
BCU 460, BCU 465 · Edition 11.19
MP
(0 to 3600 s) can be defined
MP
.
MP

11 .11 .1 Operating time in Manual mode

Parameter A067
Parameter A067 determines when Manual mode is ter-
minated.
Parameter A067 = 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 A067 = 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 A067.
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