Prepare Wall Penetrations; Termination And Fittings - Weil-McLain Ultra Manual

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gas fired water boiler
Sidewall vent/air termination:
2. Place wall penetrations to obtain minimum clearance of 12 inches
between vent pipe and adjacent air inlet elbow, as shown in Fig-
ure 52, page 40 for U. S. installations.
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.
5. Combustion air (NOT vent piping) can be manifolded as shown
in Figure 31, page 30.

Prepare wall penetrations

1. Air pipe penetration:
a. Cut a hole for the air pipe. Size the air pipe hole as close as
desired to the air pipe outside diameter.
2. Vent pipe penetration:
a. Cut a hole for the vent pipe. For either combustible or non-
combustible construction, size the vent pipe hole at least 0.4"
larger than the vent pipe diameter:
• 4" hole for 3" PVC
• 5" hole for 4" PVC
b. Insert a galvanized metal thimble in the vent pipe hole as
shown in Figure 54.
3. Use a sidewall termination plate as a template for correct location
of hole centers. Sidewall termination plates must be purchased
separately. See the parts list at the end of this manual for part
numbers.
4. Follow all local codes for isolation of vent pipe when passing
through floors or walls.
5. Seal exterior openings thoroughly with exterior caulk.

Termination and fittings

1. Prepare the vent termination elbow and the air termination elbow
(Figure 54) by inserting the bird screens. Bird screens must be
purchased separately. See the parts list at the end of this manual
for part numbers.
2. When completed, the air termination coupling must be oriented
at least 12 inches below the vent termination and at least 12 inches
above grade or snow line as shown in Figure 49, page 39.
3. You can orient the vent termination elbow either directly out-
ward or 90 degrees away from the air inlet elbow as shown in
Figure 49, page 39.
4. Maintain the required dimensions of the finished termination
piping as shown in Figure 49, page 39.
5. Do not extend exposed vent pipe outside of building more than
shown in this document. Condensate could freeze and block vent
pipe.
Part number 550-100-066/0608
— Boiler Manual
Figure 53
Figure 54
1 Vent piping
2 Air piping
3 Sidewall termination plates, by
4 Galvanized thimbles, by installer
5 Bird screen (air), by installer
6 Air inlet elbow
Separate pipes
Multiple terminations — separate pipes —
clearance from vent of one to air intake of the
next — alternate configuration of air and vent
terminations
Sidewall termination assembly — using
separate pipes
7 Elbow
8 Nipple
9 Elbow (vent termination)
installer
10 Alternate elbow orientation
11 Bird screen (vent termination) —
supplied by installer
(continued)
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