Weil-McLain 4 Series Manual page 76

®
Series 4
Vertical vent/air termination:
At least 6 feet from adjacent walls.
No closer than 5 feet below roof overhang.
At least 7 feet above any public walkway.
At lease 3 feet above any forced air intake within
10 feet.
No closer than 12 inches below or horizontally from any
door or window or any other gravity air inlet.
b. Air inlet must terminate at least 12 inches above the
roof or snow line as shown in Figure 84, page 75 .
(For Canada, the minimum is 18 inches.)
c. Do not terminate closer than 4 feet horizontally from any
electric meter, gas meter, regulator, relief valve or other
equipment. Never terminate above or below any of these
within 4 feet horizontally.
5. Locate termination so it is not likely to be damaged by for-
eign objects, such as stones or balls, or subject to buildup of
leaves or sediment.
6. Do not connect any other appliance to the vent pipe or mul-
tiple boilers to a common vent pipe.
Multiple vent/air terminations
1. When terminating multiple Ultra boilers, install the con-
centric vent/air termination assemblies as described in this
addendum.
All vent outlets must terminate at the same height
to avoid possibility of severe personal injury, death
or substantial property damage.
2. Place roof penetrations to obtain minimum of 12 inches
between centers of adjacent vent pipe of another boiler for
U. S. installations (see Figure 85, page 75 ).
3. For Canadian installations, provide clearances required by
CSA B149.1 or B149.2 Installation Code.
4. The air inlet of an Ultra boiler is part of a direct vent con-
nection. It is not classifi ed as a forced air intake with regard
to spacing from adjacent boiler vents.
Prepare roof penetrations
1. Roof penetration hole:
a. 3" termination: Cut a 5-inch diameter hole to clear the
4½-inch termination outside diameter.
b. 4" termination: Cut a 6.5-inch diameter hole to clear the
6-inch termination outside diameter.
c. Insert a galvanized metal thimble in the vent pipe hole.
2. Follow all local codes for isolation of vent pipe when passing
through fl oors, ceilings and roofs.
3. Provide fl ashing and sealing boots sized for the concentric
termination outside diameter.
Assembling the concen tric termination
1. See Figure 89, page 78 for the dimensions and details of the
termination assembly.
2. Prepare the bird screen (purchased separately if not included
with the kit). Cut the bird screen to size if required. If the
bird screen must be trimmed, cut the bird screen to fi t the
outside diameter of the PVC inner pipe supplied with the
termination kit.
76
gas-fired water boiler — Boiler Manual
3" or 4" concentric
3. Partially assemble the vent termination kit in the sequence
shown in Figure 89, page 78 .
install the rain cap and bird screen until
the assembly has been inserted through the roof
and all supports have been installed. Follow instruc-
tions to cover the end of the assembly with plastic
before inserting through the roof penetration to
prevent debris from blocking the air passages.
4. Use the following procedures to prepare termination com-
ponents and cement together.
5. Deburr inside and outside of pipe ends.
6. Chamfer outside of each pipe end to ensure even cement
distribution when joining.
7. Clean all pipe ends and fi ttings.
8. Dry thoroughly.
9. Dry assemble entire vent or air piping to ensure proper fi t
before assembling any joint.
10. For each joint:
a. Handle fi ttings and pipes carefully to prevent contamina-
tion of surfaces.
b. Apply primer liberally to both joint surfaces — pipe end
and fi tting 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 fi tting, twisting
¼ turn. Make sure pipe is fully inserted.
If necessary, you can shorten the lengths of the inner
and outer pipes for a shorter fi nished assembly. But
you must ensure the pipes butt correctly at both
ends. Failure to properly assemble the concentric
termination can result in fl ue gas recirculation,
causing possible severe personal injury or death.
Mount concentric termination
1. Before beginning vent and air piping from boiler, mount
and secure the concentric termination as shown in Fig-
ure 106, page 92 , and Figure 88, page 77 .
The vent and air piping must be securely supported,
and must not rest its weight on the boiler fi ttings.
DO NOT drill or screw into either the vent pipe
or air pipe. Failure to properly support the vent
and air piping could result in vent piping damage,
resulting in possible severe personal injury, death
or substantial property damage.
(cont.)
Part number 550-100-400/0119