Casing Assembly Model FLE Assembly
3-12 750-192
Figure 3-18. Set tape measure to sight port height
(height varies with flextube size)
Figure 3-19. Overall tape measure length should
match sight port height
Figure 3-20. Drill out insulation (drill level, pointing
toward tape measure)
4. Drill Rear Sight Port
The sight port drilling process is required to remove
the insulation from inside the rear wall to allow the
burner flame to be viewed during operation.
1. Set your tape measure to the length shown in the
table and place it at the front of the lower boiler drum
(where the front casing wall will be). This dimension
is the same as the distance from the top surface of
the lower drum to the centerline of the sight port
(Figure 3-18, 3-19).
2. Drill a 1” hole through the insulation in the center of
the sight port, parallel to the drum (Figure 3-20).
The tape measure is in approximately the same loca-
tion that the flame will be.
3. Obtain a 1” OD tube x 16” long (3/4” conduit) to use
as a guide pipe. Use the guide pipe as an applicator
and add rigidizer solution (part# 872-00458, not
included in FLE boiler assembly) to the outside of the
pipe and apply it to the inside diameter of the hole in
the insulation. Dip the pipe and coat the insulation
four to six times from the rear of the boiler and repeat
from inside. Ensure that the insulation is thoroughly
coated with the rigidizer solution (Figure 3-21).
Figure 3-21. Coating sight hole with rigidizer
Table 3-1: Sight port height from lower drum
Flextube Size Dimension
250 13”
350 18”
500/800/1100 20”
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