Weil-McLain ULTRA299-S4 Manual page 73

S 4
®
ERIES GAS
Sidewall vent/air termination:
b. The fl ue 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 fl ue products impinge on building surfaces
or plants.
d. Avoid possibility of accidental contact of fl ue 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
fi nishes.
2. Maintain clearances as shown in Figure 78 , Figure 79 , Figure 80
and Figure 81 . 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.
3. 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 addendum.
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 81 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 classifi ed 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 Boiler manual, page 55.
Part number 550-100-400/0717
-
FIRED WATER BOILER
— Boiler Manual
3" or 4" concentric
Termination location — 3" or 4" concentric
termination — clearances to public walkway
or forced air intake
Termination location — 3" or 4" concentric
termination — multiple boilers — clearance
from vent of one to air intake of the next
(cont.)
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