Installation Guide

18

FLAME SENSOR





FLAME SENSING OPERATION
 
 
 
 The Burner MUST BE
 
 

 

IGNITER
BURNER
FLAME
BURNER
(MUST BE GROUNDED)
CERAMIC INSULATOR
FLAME SENSOR
METAL CONDUCTOR
CONTROL SYSTEM
APPLIES AC VOLTAGE
TO FLAME SENSOR
AC VOLTAGE FLOWS FROM THE FLAME
SENSOR TO THE BURNER. THE BURNER
MUST BE GROUNDED FOR CURRENT TO
FLOW. DURING THIS PROCESS THE AC
VOLTAGE IS “RECTIFIED” AND BECOMES
A DC VOLTAGE. DC MICRO AMP CURRENT
THEN FLOWS BETWEEN THE FLAME SENSOR
AND THE BURNER.
GAP BETWEEN THE FLAME SENSOR AND THE
BURNER SHOULD BE APPROXIMATELY 1/2 INCH

MINIMUM FLAME SENSING CURRENT
              




Ignition Failure



