Program Sequence - Honeywell krom schroeder IFD 258 Manual

Connect voltage
In the event of fault signal: reset
00
Safety interlocks (Li)
Start-up position/standby
01
Waiting time t
start-up with  signal
Flame simulation check
0
Safety time on start-up t
gas valve opens, ignition in process
No flame detected:
04
Flame detected:
operation signalling contact closes
safety time during operation t
starts to elapse, restart or fault lock-out
04
Normal shut-down
00
Operation signalling contact opens,
gas valve closes
IFD 258 · Edition 03.12l
running,
W
running,
SA
fault lock-out
Flame fails:
SB
via  signal
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3 .2 Program sequence

Normal start-up
If, after applying voltage, an "old" fault is still being sig-
nalled, it will be necessary to reset this first. The safety
interlocks are closed, the IFD reverts to start-up posi-
tion/standby and conducts a self-test.
If it does not determine a malfunction of the internal
electronic circuitry or of the flame sensor, the flame
simulation check then commences. This takes place in
start-up position during the waiting time t
If no flame simulation is detected during that period,
the safety time on start-up t
Voltage is supplied to the gas valve and ignition trans-
former. The burner starts. After the safety time on start-
up t has elapsed, the operation signalling contact
SA
closes. This completes start-up.
Start-up without flame signal
If, after the gas valve has opened and the ignition has
been activated, no flame is detected during the safety
time on start-up t , a fault lock-out will then occur.
SA
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.
W
then starts to elapse.
SA
13