Thermo Products VH-BBP Spirit Series Installation, Operation & Maintenance Manual page 16

Install an appropriate replacement nozzle of the correct size, spray angle, and
2)
spray type. Refer to the Specification Sheets, in Appendix C of this manual, for
nozzle recommendations.
The furnace may have been handled roughly while in transit. Under some
3)
conditions, the combustion chamber can shift out of position. Check for proper
alignment of the burner air tube with the circular opening in the combustion
chamber and trial fit the burner to check the insertion depth of the oil burner into
the combustion chamber.
The end of the burner air tube should be inserted no farther than 1/4 inch back
from the inside surface of the combustion chamber, refer to Figure 4. Do not
allow the burner tube/end cone to physically touch or protrude into the chamber.
High temperatures in the combustion chamber can result in damage to the tube,
the end cone, or both. A distance greater than 1/4 inch back from the inside
chamber wall may cause flame impingement on the combustion chamber wall
and subsequent sooting or carbon char buildup.
Figure 4: Side view of correct burner insertion into combustion chamber
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