Weil-McLain Ultra 3 series User Manual page 64

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gas fired water boiler
Sidewall vent/air termination:
1. Locate the vent/air terminations using the following guidelines.
2. You must consider the surroundings when terminating the vent
and air:
a. Position the vent termination where vapors will not damage
nearby shrubs, plants or air conditioning equipment or be
objectionable.
b. The flue products will form a noticeable plume as they con-
dense in cold air. Avoid areas where the plume could obstruct
window views.
c. Prevailing winds could cause freezing of condensate and water/
ice buildup where flue products impinge on building surfaces
or plants.
d. Avoid possibility of accidental contact of flue products with
people or pets.
e. Do not locate the terminations where wind eddies could affect
performance or cause recirculation, such as inside building
corners, near adjacent buildings or surfaces, window wells,
stairwells, alcoves, courtyards or other recessed areas.
f. Do not terminate above any door or window or under a deck.
Condensate can freeze, causing ice formations.
g. Locate or guard vent to prevent condensate damage to exterior
finishes.
3. Maintain clearances as shown in
and Figure 72. Also maintain the following:
a. Vent must terminate:
• At least 6 feet from adjacent walls.
• No closer than 5 feet below roof overhang.
• At least 7 feet above any public walkway.
• At least 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" above grade or snow line
c. Do not terminate closer than 4 feet horizontally (above or be-
low) from any electric meter, gas meter, regulator, relief valve
or other equipment.
4. Locate terminations so they are not likely to be damaged by foreign
objects, such as stones or balls, or subject to buildup of leaves or
sediment.
Multiple vent/air terminations
1. When terminating multiple Ultra boilers, terminate each vent/air
connection as described in this manual.
All vent pipes and air inlets must terminate at the same
height to avoid possibility of severe personal injury, death
or substantial property damage.
2. Place wall penetrations to obtain minimum clearance as shown in
Figure 72 for U. S. installations. For Canadian installations, provide
clearances required by CSA B149.1 or B149.2 Installation Code.
3. 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.
4. Combustion air (NOT vent piping) can be manifolded as shown
in Figure 59, page 55.
64
— Boiler Manual
Figure 69, Figure 70, Figure 71
3" PVC concentric
Figure 70
Termination location — Weil-McLain vent/air
plate — clearances to openings
Figure 71
Termination location — Weil-McLain vent/
air plate — clearances to public walkway or
forced air intake
Figure 72
Termination location — Weil-McLain vent/air
plate — multiple boilers — clearance from
vent of one to air intake of the next
(cont.)
Part number 550-100-090/0809