Suburban Furnace Model NT-24SP Tune-Up Kit comes in two variations. (Kit #1) is a single sense electrode (one wire that goes to the electrode, applicable to S/N above 920500001), (Kit #2) is a dual sense electrode (two wires that go to the electrode, applicable to S/N below 920500001). Please verify which kit is applicable to your furnace prior to ordering
Tune-Up Kit #1 Contents (Links)
Tune-Up Kit #2 Contents (Links):
SUBURBAN FURNACE NT-24SP EXPLODED PARTS VIEW LINKS