OPERATES BETWEEN 125 DEG F AND MINUS 20 DEG F;SCANNER OPERATES BETWEEN 212 DEG F AND MINUS 40 DEG F; 7 SECOND PURGE CYCLE PRIOR TO EACH START;FOLLOWING EACH PURGE CYCLE A 10 SECOND IGNITION TRIAL OCCURS;FLAME FAILURE RESULTS IN DE-ENERGIZING THE SOLENOID;SHUTS OFF BURNER MOTOR AND IGNITION TRANSFORMER;PROVIDES MECHANICAL LOCKOUT;TURNS ON ALARM CIRCUIT