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Weil-McLain 78 Boiler For Gas, Light Oil, Gas/Light Oil Fired Burners
Assemble Block
3a
Sections are top heavy. Unbolted sections may
fall if not supported, resulting in severe
personal injury or death.
Install back refractory blanket:
1. Lay back section on floor with ports face up.
2 Apply water glass as an adhesive to blanket.
3. Press blanket against back target wall as
shown in Figure 4.
4. Using knife, cut hole through blanket to
expose observation port opening.
Prepare back section:
1. Apply 1/8" continuous bead of sealing rope
adhesive in sealing rope grooves. See Figure
4. Do not get any adhesive on machined port
surfaces.
2. Place 1/2" sealing rope in groove. Around
curves, grasp at 1" intervals and push
together. Do not stretch.
Do not pre-cut rope. Gas tight
seal must be maintained to
prevent possibility of flue gas
leakage and carbon monoxide
emissions, causing severe
personal injury or death.
3. Remove any grit from port machined
surfaces with clean rag.
Do not use petroleum-based
cleaning or sealing compounds
in boiler system. Severe
damage to system components
can result, causing substantial
property damage.
4. Place 7-1/2" and 3-1/2" sealing rings in
appropriate port openings. See Figure 4. If
sealing ring slips out of groove, stretch ring
gently for several seconds, then reposition in
groove.
Part No. 550-141-705
6
Cut off rope
even with
edges
Sealing rope
Cut off rope
even with
edge
Cut off
rope
even
with
edge
7 1/2"
Sealing
ring
Sealing
rope
Cut out
observation
port opening
Back refractory
(apply waterglass
to entire back side)
3 1/2” Sealing ring
Figure 4