Sequence Of Operation - Two Stage (N7/L7) - Space-Ray FUSION Series Installation & Operation Instructions

Note: When the FUSION is operated by a thermostat interrupting the line voltage (120V) to the heater then the
post purge function is disabled.
If the flame is not sensed during sequence T3 then the burner will automatically begin re-ignition sequence T2.
The ignition sequence will be repeated three times with a 60 second inter-purge. If the flame is not re-established
the heater will go to lockout.
17.1) SEQUENCE OF OPERATION – TWO STAGE (N7/L7)
The chart below shows the sequence of operation for the normal operating cycle of the PCS/PCA (N7/L7) when
connected to a permanent 120V power supply and the heater is turned on and off by a remote 24V thermostat.
Note:
If the flame is not sensed during sequence T3 then the burner will automatically begin re-ignition sequence T2.
The ignition sequence will be repeated three times with a 60 second inter-purge. If the flame is not re-established
the heater will go to lockout.
Form 43343100
April 2022 A -43-