Crown Boiler CLBR68-112L - Manual (Page 5)

Only qualified service personnel shall perform installation and service.
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8) The burner and wiring harness are equipped with mating, three (3) pole, quick-
connect, electrical couplings. To make the connection between the burner wiring
harness and the furnace wiring harness, open the burner junction box cover (the
oil primary control serves as the cover) and remove a knockout slug from the
right-hand side of the burner junction box.
9) Insert the electrical coupling from the furnace wiring harness through the
knockout hole in the burner junction box. Snap together the furnace electrical
coupling with the oil burner electrical coupling, refer to Figure 3.
Figure 3: Connecting the Furnace Wiring Harness to the Burner Wiring Harness