Page No 28 of 52 Reznor, Photon, Installation Manual, EN 2021-04, D301310 Iss 0
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Start position The system is not in lock-out and can proceed with the start up sequence upon a
demand for heat
Pre-purge time This is a period of 35 seconds during which the combustion fan operates prior to
activation of the ignition device.
Safety time The safety time is the delay between the gas valve being energised and the flame
sensor checking for the presence of a flame. This is a period of 4 seconds.
Note : if no flame is sensed, the burner controller will attempt ignition 3 times before
going into lock-out mode.
Post-purge time This is the time of 255 seconds between burner shut-down and the moment the
combustion fan is de-energised.
Figure 10 Ignition system timetable
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