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MegaSteam
Installation & Service Manual
Figure 2-4: Top View - Burner Swing Door Mounted to Cast Iron Block Assembly (Jacket Removed for Clarity)
10. Inspect burner swing door insulation for
damage and proper type.
By design, for all models, cast bars on front
section between the combustion chamber,
and, between the left and right side 2nd and
3rd pass flueways should make an impression
in door insulation to seal the chambers.
By design, door insulation on model MST629
& MST758 will have
two by-pass pockets cast
into the insulation centered on the bar between
the combustion chamber and 3rd pass
flueways. By design, door insulation on models
MST288, MST396, MST513, and MST892 will
not have any by-pass pockets. If insulation
is damaged, or, improper type regarding the
pockets, it must be replaced.
2
Unit-Pak Boiler Assembly
(continued)
