Parallel Reset; Remote Reset; Behaviour In The Event Of Flame Failure - Honeywell krom schroeder IFD 258 Manual

7 . 7 Parallel reset

Several automatic burner control units can be reset in
parallel using the external button. The IFD 258 cannot
be reset by mains failure. The fault signalling contact
does, however, open as soon as the mains voltage fails.

7 .8 Remote reset

Permanent
The unit can no longer be reset by permanent remote
reset: if a remote reset signal is permanently applied to
terminal 4, flashes on the display as a warning sig-
nal. The IFD continues operation until it locks off.
Automatic (PLC)
Check whether automatic remote reset (PLC) complies
with standards (reset for no longer than 1 second).
If a fault is acknowledged by remote reset too often,
flashes on the display to indicate a fault (too many re-
mote resets). 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.
IFD 258 · Edition 03.12l
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7 .9 Behaviour in the event of flame failure

In the event of a flame failure, either a restart or an
immediate fault lock-out can be selected using a switch
in the upper section of the automatic burner control
unit IFD 258.
Restart
Select for burners that occasionally demonstrate un-
stable flame behaviour.
Immediate fault lock-out
Select an immediate fault lock-out when using the
unit with slow-closing air control valves or continuous
control, if the burner may not be started at maximum
capacity, for burners with a capacity of over 120 kW in
accordance with EN 676 and in the case of On/Off in-
termittent operation.
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