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Watch plenum temperature as burner goes through a few cycles, to be sure that it is operating properly. 1. Hi-limit and cycling thermostat must be wired into heater control box for heater to operate. 2. Open all manual shutoff valves to heater unit. 3. Start fan. This will supply power to heater. 4. Turn thermostat dial to its highest setting. 5. Turn toggle switch on. Both red lights should light up indicating power to the control circuit. 6. Heater should now be lit. If not check to see that a