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(protruding from the bottom of the front section
casting - see Figure 4A).
Step 3. Use one hand to help hold door in position
by lifting up on rear burner housing or applying
pressure directly to the door while re-installing
the securing hardware with your opposite hand.
Always install right side latching hardware
(5/16" x
1-3/4" lg. tap bolt and fl at washer)
fi rst, then install left side hinge hardware (5/16"
x 1-3/4" lg. tap bolt and fl at washer) second.
Apply additional pressure while hand tightening
the hardware as far as possible, then release the
pressure.
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Step 4. Use a hand wrench to tighten door hardware
and always start with the right side cap
screw fi rst. Use an alternating tightening
method from right side tap bolt to left side tap
bolt to tighten door equally until sealed without
applying excessive torque. Never tighten left
side fl ange bolt fi rst or tighten either piece of
hardware 100% without using the alternating
tightening method described above.
Failure to follow the prescribed procedure could
cause thread damage to casting or a leak in the
door seal. If left side tap bolt is tightened before
right side tap bolt, right side of door can not be
drawn-in to provide an air tight seal, as shown in
Figure 4C. Applying excessive torque will only
cause thread damage.
Figure 4C: Top View - Burner Swing Door Fully Closed but Not Properly Secured or Sealed
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E. INSPECT SWING DOOR INSULATION AND
ROPE GASKET.
1. Open burner swing door using procedure previously
outlined in Paragraph D of this section.
2. Inspect fi berglass rope located on the swing door.
The rope must be evenly distributed around the
perimeter of the door groove and cannot bunch or
overhang. There must not be a gap where the two
ends of the rope meet. Repair or replace if the rope
is damaged or if there is a gap between the ends.
3. Inspect burner swing door insulation for damage and
proper type.
a. By design, cast bars on front section between
the combustion chamber and between the left
and right side 2
make an impression in door insulation to seal the
e
. s
chambers.
b. By design, door insulation on model MPO231
will have two (2) by-pass pockets cast into
the insulation centered on the bar between the
combustion chamber and 3
On models MPO84 thru MPO189 these pockets
should not be present. If insulation is damaged
or not of proper type regarding pockets, it must
be replaced.
4. Do not close and secure door at this time, proceed to
Field Assembly Details, Paragraph F.
F. FIELD ASSEMBLY OF BOILER TRIM AND
CONTROLS
Open miscellaneous parts carton and remove contents.
Identify the components using the illustrations (Figures
nd
rd
and 3
pass fl ueway should
rd
pass fl ueways.
13
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