The Honeywell RM7800G1018 120 V/60 HZ. AirFlow Switch CHECK OPTION. Microprocessor Based Integrated Burner Control, For use with Automatically Fired Gas, Oil, Coal or Combination Fuel Single Burner Applications, 120Vac, 10 Second or 15 Second, 30 Second or Intermittent Main Flame Establishing Period, 4 Second or 10 Second Pilot Flame Establishing Period, Interrupted Pilot, Selectable Second Stage Pilot Valve, Running Interlocks, Includes S7800 Display, LHL-LF Proven, 15 Second Post Purge,User Selectable Air Flow Check, Early Spark Termination of 5 Seconds, -40-140 Degree Ambient Temperature Range