Weil-McLain 78 manual 3a Assemble Block, Install back refractory blanket, Prepare back section

Weil-McLain 78 Boiler For Gas, Light Oil, Gas/Light Oil Fired Burners

3a Assemble Block

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.

		Cut off rope
		even with
		edges
	Sealing rope	7 1/2"
				Sealing
				ring
	Cut off rope
	even with
	edge
			Sealing
			rope
			Cut out
			observation
			port opening
Cut off
rope			Back refractory
even
			(apply waterglass
with
			to entire back side)
edge

	3 1/2” Sealing ring
	Figure 4
6	Part No. 550-141-705