Sequence Of Operation - Two Stage (N7/L7) - Space-Ray LTU 160/100-N7 Installation And Operation Instructions Manual

20.1) SEQUENCE OF OPERATION – TWO STAGE (N7/L7)
The chart below shows the sequence of operation for the normal operating cycle for a two stage heater (N7/L7).
.If the flame is not sensed during sequence T3 or T4, then the burner will automatically begin ignition as in
sequence T2. If the flame is not re-established the heater will go to lockout.
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Dec 2017 -51-