Honeywell Burner C7005A

The pilot flame must make good contact with the flame rod and furnish reliable ignition for the main burner. Check to be sure that the flame rod is located at the junction of the main burner flame and the pilot flame. Ensure that the main valve opens or unlocks only when the pilot flame is strong enough to ignite the main burner

Secondary air velocity over the pilot nozzle must not cause unstable flame contact with the flame rod, because this produces chattering of the flame detector relay;

Test Start the burner and measure the flame signal with both ignition and pilot or main burner on, and then with only the pilot or main burner on. Any significant difference greater than 0.5 microamp, or 0.25 Vdc with 7800 SERIES controls, indicates ignition interference

To Eliminate Ignition Interference: A Make sure there is enough ground area

B Be sure the ignition electrode and the flame rod are on opposite sides of the ground area

C Check for correct spacing between the ignition electrode and ground for 6000 volt systems—1/8 to 3/16 inch (3.2 to 4.8 mm)

D Make sure the leadwires from the flame rod and ignition electrode are not too close together

E Replace any deteriorated leadwires

F If the problem cannot be eliminated, consider changing to an ultraviolet flame detection system with a Q624A1014 solid-state spark generator;