Weil-McLain Ultra Manual page 43

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gas fired water boiler
Vertical vent/air termination:
4. Maintain clearances to termination as given below:
a. Vent outlet must be located:
• 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 56, page 42. (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 equip-
ment. Never terminate above or below any of these within
4 feet horizontally.
5. Locate termination so it is not likely to be damaged by foreign
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 multiple
boilers to a common vent pipe.
Multiple vent/air terminations
1. When terminating multiple Ultra boilers, install the concentric
vent/air termination assemblies as described in this supplement.
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. installa-
tions (see Figure 57).
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 connection.
It is not classified as a forced air intake with regard to spacing from
adjacent boiler vents.
Prepare roof penetration
1. Roof penetration hole:
a. Cut a 5-inch diameter hole to clear the 4½-inch termination
outside diameter.
b. Insert a galvanized metal thimble in the vent pipe hole.
2. Follow all local codes for isolation of vent pipe when passing
through floors, ceilings and roofs.
3. Provide flashing and sealing boots sized for the concentric termina-
tion outside diameter, 4½ inches.
4. Mount the termination as shown in
Part number 550-100-066/0608
— Boiler Manual
Figure 60, page 45.
3" PVC concentric
Figure 57
Vertical termination — Weil-McLain 3" PVC
concentric — multiple boilers
Assembling the concentric termination
1. See Figure 58, page 44 for the dimensions and details of
the termination assembly.
2. You must obtain a bird screen separately. See the parts
list at the end of this manual. Prepare the bird screen.
a. Cut the bird screen to fit the outside diameter of the
2½-inch PVC inner pipe supplied with the termina-
tion kit (inner pipe O.D. is 2
3. Partially assemble the vent termination kit in the se-
quence shown in Figure 59, page 44.
DO NOT
install the rain cap and bird screen
until the assembly has been inserted through
the roof and all supports have been installed.
Follow instructions 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
components 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 fittings.
8. Dry thoroughly.
9. Dry assemble entire vent or air piping to ensure proper
fit before assembling any joint.
(continued)
/ inches).
7
8
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