Normal start:After the power is supplied, the fault signal still occurs, it must be reset first, the safety interlock will be closed, the IFD will switch to the start position, and the automatic
I detect.
During the waiting time tW, it is not possible to determine the failure of the internal electronic circuit or the flame monitor, check the flame simulation signal.
No flame simulation signal is detected during tW and the safe start time ends. Gas valve and ignition transformer energized, burner
start up. At the end of the safe starting time tSA, the running signal terminal is closed, and the starting procedure ends.
Start without flame signal
During the safe start time tsA, the gas valve opens and the ignition starts, no flame is detected, and a fault lockout occurs.
Flame detection failed during operation
In operation, the flame detection fails, the IFD258, latches the fault at the tSB safe run time. The valve closes immediately and the burner stands
Instant restart. If the burner does not start, a fault lockout occurs.