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Part number 550-100-400/0119
91
®
Series 4
gas-fired water boiler — Boiler Manual
Figure 104 Boiler ent and air connections
Inserting/securing vent or air pipe
into boiler connectors
AL29-4C vent pipe — If using AL29-4C stain-
less vent pipe, you must install a PVC-to-vent
pipe adapter at the boiler vent connection (and
at the termination if using the Weil-McLain
plate or the concentric termination). Use only
the adapter made by the vent pipe manufac-
turer.
1. PVC/ABS pipe — Clean and chamfer insertion end of
pipe. Deburr inside of insertion end. Clean and deburr
inside and outside of other end of pipe.
The pipe end must be smooth and chamfered
to prevent possible damage to sealing gasket
in vent or air pipe adapter. Failure to comply
could result in leakage, causing possible severe
personal injury or death.
2. Inspect vent or air adapter (above) — verify no obstruc-
tions or foreign objects inside.
3. Loosen clamp screw.
4. Measure 3½ inches from end of pipe and make a mark
with felt-tip pen.
5. Loosen adapter clamp screw.
6. Apply small amount of silicon grease to end of pipe to
ease insertion.
7. Insert pipe into adapter.
8. Slide pipe down until the 3½-inch mark is reached.
Do not apply excessive force or bend the adapter
or fl ue/air pipe when inserting. The adapter or
seal could be damaged.
9. Secure vent or air pipe by tightening the adapter clamp
securely. Do not overtighten. The seal is accomplished
with the internal gasket. The clamp is only to hold the
pipe in place.
: Obtain a bird
screen (sized for air inlet opening) the from
Weil-McLain. Insert the bird screen into the
air inlet opening to prevent foreign objects
from falling into the opening.
Install vent — from boiler to termination
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