BCU 480 · Edition 06.07
51
Reset
7 .5
Parallel reset
7 .5 .1
Several automatic burner control units can be reset in parallel
using the external button. The BCU cannot be reset by mains
failure.
Permanent remote reset
7 .5 .2
Permanent remote reset gives rise to a malfunction. If a remote
reset signal is permanently applied to terminal 3,
52
flashes
on the display to indicate a fault.
Reset with a pulse < 1 s.
Automatic remote reset (PLC)
7 .5 .3
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, error
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 malfunction
can not be remedied by changing the method of activation.
Burner start
7 .5 .4
A furnace start may only be initiated, if it has been ensured
using an appropriate procedure that there is no combustible
mixture in the combustion/processing chamber, in the con-
nected areas or in the exhaust gas system (heat exchanger,
dust collector). This can be achieved by pre-purge, which oc-
curs immediately before ignition or within the period specified
in the operating instructions.
In the case of multiple burner applications, pre-purge is not
necessary after a normal burner shut-down.
Note the requirements of the Standards. For exceptions, see
Standards.
Restart and start-up attempts
7 .5 .5
The precondition for a restart/start-up attempt is that activa-
tion 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 ap-
plication.
Note the requirements of the Standards. For exceptions, see
Standards.
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