Specifications

Part number 550-100-090/0809
g a s -f i r e d w a t e r b o i l e r — Boiler Manual
22
Install vent/air piping — boiler to W-M termination
Complete termination preparation
Install vent and air terminations before proceeding. See 1.
previous pages for instructions.
Installing vent and air piping
For reference in the following, see previous pages.1.
Work from the boiler to vent or air termination. Do not 2.
exceed the lengths given in the previous pages for either
the air or vent piping.
As shown in the maximum length tables, the Ul-a.
tra-80 or Ultra-105 may be installed with either
2-inch or 3-inch vent and air piping.
As shown in the maximum length tables, the Ul-b.
tra-230 may be installed with either 3-inch or 4-inch
vent and air piping.
You must install appropriate pipe reducers, where c.
required, at both the boiler and at the termination
assembly.
See 3. Figure 23 for attaching vent and air pipes at the
boiler.
Cut pipe to required lengths.4.
Deburr inside and outside of pipe ends.5.
Chamfer outside of each pipe end to ensure even cement 6.
distribution when joining.
Clean all pipe ends and fittings. Dry thoroughly.7.
Dry assemble entire vent or air piping to ensure proper 8.
fit before assembling any joint.
For each joint:9.
Handle fittings and pipes carefully to prevent con-a.
tamination of surfaces.
Apply primer liberally to both joint surfaces — pipe b.
end and fitting socket.
While primer is still damp, lightly apply approved c.
cement to both surfaces in a uniform coating.
Apply a second coat to both surfaces. Avoid using d.
too much cement on sockets to prevent cement
buildup inside.
With cement still wet, insert pipe into fitting, twist-e.
ing ¼ turn. Make sure pipe is fully inserted.
Wipe excess cement from joint. Check joint to be f.
sure a smooth bead of cement shows around the
entire joint.
Install pipe supports as shown in 10. Figure 22, page 21.
Slope vent and air piping continuously toward boiler, 11.
with at least 1/4 inch drop per foot of run. Do not allow
sags at any point.
Maintain minimum clearance of 12. C\zn inch between vent
pipe and any combustible wall or material.
Seal wall or floor penetration openings following local 13.
code requirements.
Boiler vent and air connectionsFigure 23
Inserting/securing vent or air pipe into
boiler connectors
AL294C vent pipe — If using AL294C stainless 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 manufacturer.
PVC/ABS pipe — Clean and chamfer insertion end of pipe. 1.
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.
Inspect vent or air adapter (above) — verify no obstructions 2.
or foreign objects inside.
Loosen clamp screw.3.
Measure 3½ inches from end of pipe and make a mark with 4.
felt-tip pen.
Loosen adapter clamp screw.5.
Apply small amount of silicon grease to end of pipe to ease 6.
insertion.
Insert pipe into adapter.7.
Slide pipe down until the 3½-inch mark is reached.8.
Do not apply excessive force or bend the adapter
or flue/air pipe when inserting. The adapter or seal
could be damaged.
Secure vent or air pipe by tightening the adapter clamp se-9.
curely. Do not overtighten. The seal is accomplished with the
internal gasket. The clamp is only to hold the pipe in place.