Reset; Parallel Reset; Permanent Remote Reset; Automatic Remote Reset (Plc) - Honeywell BCU 460 Technical Information

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6 .8 Reset

6 .8 .1 Parallel reset

Several automatic burner control units can be reset in
parallel using an external button. The BCU cannot be
reset by mains failure.

6 .8 .2 Permanent remote reset

Permanent remote reset gives rise to a malfunction. If
a remote reset signal is permanently applied to termi-
nal 3, 52 flashes on the display to indicate a fault.
Reset with a pulse < 1 s.

6 .8 .3 Automatic remote reset (PLC)

In the case of automatic remote reset (PLC), the reset
pulse duration should not exceed 1 second. Check
compliance with Standards.
If a fault is acknowledged by remote reset too often, er-
ror 10 (Too many remote resets) is displayed. The error
can only be acknowledged with the Reset/Information
button on the unit.
The burner malfunction must be remedied. The mal-
function cannot be remedied by changing the method
of activation.
BCU 460, BCU 465 · Edition 03.16l

6 .9 Burner start

A furnace start may only be initiated, if it has been en-
sured using an appropriate procedure that there is no
combustible mixture in the combustion/processing
chamber, in the connected areas or in the exhaust gas
system (heat exchanger, dust collector). This can be
achieved by pre-purge, which occurs immediately be-
fore ignition or within the period specified in the operat-
ing instructions.
In the case of multiple burner applications, pre-purge is
not necessary after a controlled burner shut-down.
Note the requirements of the Standards. For exceptions,
see Standards.

6 .10 Restart and start-up attempts

The precondition for a restart/start-up attempt is that
activation of the restart allows the burner to restart as
intended (in all operating phases). In this case, it must
be ensured that the program sequence started by the
BCU matches the application.
In accordance with EN 746-2, a maximum of three
start-ups are permitted in specific cases if the safety of
the installation is not impaired. Note the requirements
of the Standards!
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