Installing Vent And Air Piping; Install Vent/Air Piping - Boiler To Termination - Weil-McLain Ultra Manual

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gas fired water boiler
Install vent/air piping — boiler to termination
Complete termination preparation
1. Install vent and air terminations before proceeding. See previous
pages for instructions.

Installing vent and air piping

1. For reference in the following see:
a. Sidewall terminations: see
b. Vertical terminations: see
2. Work from the boiler to vent or air termination. Do not exceed
the lengths given in the previous pages for either the air or vent
piping.
a. As shown in the maximum length tables, the Ultra-80 or
Ultra-105 may be installed with either 2-inch or 3-inch vent
and air piping.
b. As shown in the maximum length tables, the Ultra-230 may be
installed with either 3-inch or 4-inch vent and air piping.
c. You must install appropriate pipe reducers, where required, at
both the boiler and at the termination assembly.
3. See Figure 65 for attaching vent and air pipes at the boiler.
4. Cut pipe to required lengths.
5. Deburr inside and outside of pipe ends.
6. Chamfer outside of each pipe end to ensure even cement distribu-
tion when joining.
7. Clean all pipe ends and fittings. Dry thoroughly.
8. Dry assemble entire vent or air piping to ensure proper fit before
assembling any joint.
9. For each joint:
a. Handle fittings and pipes carefully to prevent contamination
of surfaces.
b. Apply primer liberally to both joint surfaces — pipe end and
fitting socket.
c. While primer is still damp, lightly apply approved cement to
both surfaces in a uniform coating.
d. Apply a second coat to both surfaces. Avoid using too much
cement on sockets to prevent cement buildup inside.
e. With cement still wet, insert pipe into fitting, twisting ¼ turn.
Make sure pipe is fully inserted.
f. Wipe excess cement from joint. Check joint to be sure a smooth
bead of cement shows around the entire joint.
10. Install pipe supports as shown in
ure 67, page 49.
11. Slope vent and air piping continuously toward boiler, with at least
1/4 inch drop per foot of run. Do not allow sags at any point.
12. Maintain minimum clearance of
any combustible wall or material.
13. Seal wall or floor penetration openings following local code re-
quirements.
48
— Boiler Manual
Figure 66, page 49.
Figure 67, page 49.
Figure 66, page 49 or Fig-
C\zn inch between vent pipe and
Figure 65
Boiler vent and air connections
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 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
obstructions 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 flue/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 ac-
complished with the internal gasket. The clamp is
only to hold the pipe in place.
Part number 550-100-066/0608