Form 43343320
Dec 2017 -49-
Note: When the SPS / SPU 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.
19.1) SEQUENCE OF OPERATION ā TWO STAGE (N7/L7)
The chart below shows the sequence of operation for the normal operating cycle of the SPS/SPU (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.
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