Honeywell BCU 460 Technical Information page 62

Parameters
4 . 7 .3 Air flow monitoring during operation (BCU
465 . .L)
Parameter 07
This parameter determines whether the air flow is moni-
tored during operation.
Parameter 07 = 0: The air flow is not monitored during
operation.
Parameter 07 = 1: The air flow is monitored during op-
eration (pressure switch signal at terminal 21), i.e.
Check of the LOW signal (pressure switch contact
open) before starting the program run
No air may flow before the program run is started. A
LOW signal must be applied to the pressure switch. If
the LOW signal is not applied, the BCU performs a fault
lock-out after expiry of a delay time (as long as the
flame simulation delay time t
"no-flow" state check failed.
Check of the HIGH signal (pressure switch contact
closed) after activating the air valve
The air must flow and a HIGH signal must be applied to
the pressure switch after the air valve has been activat-
ed. If the HIGH signal is not applied within a specified
testing time (as long as the safety time on start-up t
the BCU performs a fault lock-out. Fault message:
no air pressure in operating state.
BCU 460, BCU 465 · Edition 03.16l
). Fault message: 0 ,
LV
If the air pressure drops during operation, the BCU
conducts either a fault lock-out (fault message: 4 ) or
a restart as in the event of flame failure. Should restart
fail, fault message 2 is displayed.
),
SA
,
62