Install Instructions

Figure 5B: 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 ueways should

make an impression in door insulation to seal the

chambers.

By design, door insulation on model MST629

will

have two by-pass pockets cast into the insulation

centered on the bar between the combustion

chamber and 3rd pass ueways. By design, door

insulation on models MST288, MST396 & MST513

will not have any by-pass pockets. If insulation is

damaged, or, improper type regarding the pockets, it

must be replaced.

SECTION II: UNIT-PAK BOILER ASSEMBLY (continued)