1. Turn on the gas and electrical supply.
2. Set the thermostat to call for heat. The blower motor will energize.
3. Ignition should occur after the 30-second air pre-purge.
4. If ignition fails, the unit will spark for approximately 21 seconds and go into safety lockout. Turn the
thermostat (power) off for 60 seconds to take the system out of lockout.
5. If the heater does not light, manually reset the thermostat or shut off power completely for 5 minutes before
attempting to relight.
6. To permanently shut down the heater, turn off the gas and electrical supply.
NOTE: The lighting and shutdown instructions are also shown on the permanent nameplate label attached to the
heater control box.
17.0) SEQUENCE OF OPERATION ā SINGLE STAGE (N5/L5)
The chart below shows the sequence of operation for the normal operating cycle.
If the flame is not sensed during sequence T3 then the burner will automatically begin ignition sequence T2. If
the flame is not re-established the heater will go to lockout.
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