Ultra Boiler Manual

Part number 550-100-440/0122
24
  
5. Maintain clearances to vent termination as given below:
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inches above the roof
or snow line and at least 12inches below the vent termina-
tion as shown in Figure22,page23.
c. Do not terminate closer to 4feet horizontally from any
electric meter, gas meter, regulator, relief valve or other
equipment. Never terminate above or below any of these
within 4 feet horizontally.
6. 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.
7. Do not connect any other appliance to the vent pipe or mul-
tiple boilers to a common vent pipe.
Prepare roof 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
noncombustible construction, size the vent pipe hole at
least 0.4” larger than the vent pipe diameter:
• 2¾” hole for 2”
• 4” hole for 3”
• 5” hole for 4”
b. Insert a galvanized metal thimble in the vent pipe hole.
3. Space the air and vent holes to provide the minimum spacings
shown in Figure23.
4. Follow all local codes for isolation of vent pipe when passing
through oors, ceilings and roofs.
5. Provide ashing and sealing boots sized for the vent pipe
and air pipe.

1. Prepare the vent termination elbow and the air termination
elbow (Figure22, page23) by inserting bird screens. Bird
screens must be purchased separately. See the parts list at the
end of this manual for part numbers.
a. If using 3-inch piping for an Ultra-230, cut a 4-inch bird
screen by placing 3-inch tting on screen and cutting
around it as a template.
2. e air piping must terminate in a down-turned 180-degree
return bend as shown in Figure22,page23. e edge of the
air intake elbow must be at least 12 inches above the roof or
snow line.
Separate pipes (continued)
Figure 23 Termination location — separate pipes — terminations for
multiple boilers
3. e vent piping must terminate in an up-turned coupling as
shown in Figure22,page23 in order to avoid recirculation of
ue products into the combustion air stream.
4. Maintain the required dimensions of the nished termination
piping as shown in Figure22,page23.
5. Do not extend exposed vent pipe outside of building more
than shown in this document. Condensate could freeze and
block vent pipe.
Multiple vent/air terminations (Figure23)
1. When terminating multiple Ultra boilers, terminate each vent/
air connection as described in this section.
Terminate all vent pipes at the same height and all
air pipes at the same height to avoid possibility of
severe personal injury, death or substantial property
damage.
2. Place roof penetrations to obtain minimum clearance of
12inches between edge of air intake elbow and adjacent vent
pipe of another boiler for U. S. installations (see Figure23).
For Canadian installations, provide clearances required by
Natural Gas and Propane Installation CAN/CSA B149.1 or
B149.2 Installation Code.
3. e air inlet of an Ultra boiler is part of a direct vent connec-
tion. It is not classied as a forced air intake with regard to
spacing from adjacent boiler vents.