Installation Guide

Part number 550-100-066/0608
37
g a s -f i r e d w at e r b o i l e r — Boiler Manual
Sidewall vent/air termination: 3” PVC concentric (continued)
The ue products will form a noticeable plume as they con-b.
dense in cold air. Avoid areas where the plume could obstruct
window views.
Prevailing winds could cause freezing of condensate and water/c.
ice buildup where ue products impinge on building surfaces
or plants.
Avoid possibility of accidental contact of ue products with d.
people or pets.
Do not locate the terminations where wind eddies could affect e.
performance or cause recirculation, such as inside building
corners, near adjacent buildings or surfaces, window wells,
stairwells, alcoves, courtyards or other recessed areas.
Do not terminate above any door or window or under a deck. f.
Condensate can freeze, causing ice formations.
Locate or guard vent to prevent condensate damage to exterior g.
finishes.
Maintain clearances as shown in 3. Figure 35, Figure 37, Figure 38
and Figure 39. Also maintain the following:
Vent must terminate:a.
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.
Air inlet must terminate at least 12” above grade or snow lineb.
Do not terminate closer than 4 feet horizontally (above or be-c.
low) from any electric meter, gas meter, regulator, relief valve
or other equipment.
Locate terminations so they are not likely to be damaged by foreign 4.
objects, such as stones or balls, or subject to buildup of leaves or
sediment.
Multiple vent/air terminations
When terminating multiple Ultra boilers, terminate each vent/air 1.
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.
Place wall penetrations to obtain minimum clearance as shown in 2.
Figure 39 for U. S. installations. For Canadian installations, provide
clearances required by CSA B149.1 or B149.2 Installation Code.
The air inlet of an Ultra boiler is part of a direct vent connection. 3.
It is not classified as a forced air intake with regard to spacing from
adjacent boiler vents.
Combustion air (NOT vent piping) can be manifolded as shown 4.
in Figure 31, page 30.
Install terminations — concentric pipes
Assemble the vent termination as described for vertical concentric 1.
terminations, beginning on page 43.
If necessary, you can shorten the lengths of the inner and
outer pipes for a shorter finished assembly. But you must
ensure the pipes butt correctly at both ends. Failure to
properly assemble the concentric termination can result
in ue gas recirculation, causing possible severe personal
injury or death.
Termination location — Weil-McLain vent/air 
plate — clearances to openings
Termination location — Weil-McLain vent/
air plate — clearances to public walkway or
forced air intake
Termination location — Weil-McLain vent/air 
plate — multiple boilers — clearance from
vent of one to air intake of the next