Reznor UDBS Option - Installation - Separated Combustion Venting - Manual (Page 13)

Form I-UD-V-SC, PN195676R17, Page 13
3.2 Installation
Instructions
for Vertical Vent/
Combustion Air
Kit Option CC2
(in compliance with
requirements on
pages 3-8)
1) Determine the location of the vent terminal.
WARNING
All vent terminals must be positioned or located away from
fresh air intakes, doors and windows to preclude combustion
products from entering occupied space. Failure to comply
could result in severe personal injury or death and/or
property damage.
Select a location away from fresh air intakes, allowing space for the concentric adapter box inside. Vent terminal
must be located from adjacent buildings as shown in FIGURE 17, page 15.
If more than one vertical concentric vent/combustion air terminal (Option CC2) is being installed, the minimum
spacing between vent centerlines is determined by the minimum outdoor design temperature (most extreme
outdoor condition at the installation site).
Minimum Outdoor Design
Temperature
Minimum Spacing between Centerlines of Vent
Pipes in Vertical Combustion Air/Vent Terminals
°F °C inches mm
31 or warmer 0 or warmer 36 914
-10 to 30 -23 to -1 60 1524
less than -10 less than -23 84 2134
FIGURE 13 -
Brackets for
Attaching the
Concentric
Adapter Box to
the Roof
1) Attach the Brackets to the Box - The 6” (152mm)
portion of each bracket is designed with five 7/32”
diameter holes so that attachment to the box can be
adjusted.
If the roof is combustible, position brackets to allow for a
2” (51mm) clearance between the box and the roof. After
careful positioning, use sheetmetal screws to attach the
brackets. NOTE: If any holes are made in the box in error,
they must be sealed.
2) Attach the Box to the Roof (Step 5)
When the box is attached to the roof in Step 5, use the
2-1/2” (64mm) portion of the brackets. To adjust to
construction each bracket has three 7/32” diameter holes.
2) Install the Vent Pipe and Combustion Air Pipe Run
- Use the type of pipe specified (Requirement No. 1),
page 3, and comply with the attachment requirements
in Requirement No. 1.2, page 3. Length must comply
with Requirement No. 1.3, page 4.
Seal all joints. Due to the high temperature, do not
enclose the exhaust pipe or place pipe closer than 6”
(152 mm) to combustible material. Provide supports for
the pipes. Extend the runs to close to the roof at the
location selected in Step 1).
3) Prepare a clearance hole through the roof for the
combustion air pipe -- a 6” (152mm) diameter pipe
for Sizes 30-125 or an 8” (203mm) diameter pipe for
Sizes 150-400. A thimble may or may not be required
depending on building construction and/or local
codes. The larger diameter combustion air pipe serves
as clearance for the vent pipe on non-combustible
construction.
4) Prepare the Concentric Adapter Box
a. Attach the brackets to the box. See FIGURE 13.
b. Attach the outside portion of the combustion
air pipe to the box. Determine the length of the
combustion air pipe so that dimension ”X” in FIGURE 14
is equal to the bracket length, plus the roof thickness,
plus anticipated snow depth, but does not exceed 48”
(1219mm) or have less than 18” (457mm) of pipe above
the roof. Attach the inlet air pipe to the collar of the
concentric adapter box with sheetmetal screws.
5) Attach the concentric adapter box to the roof. On
the inside, insert the combustion air pipe up through the
opening and attach brackets to the roof. (See FIGURES
13, 14, and 15.) On the outside, flash the combustion air
pipe to the roof. Flashing is field supplied .
Outside view with
concentric adapter
box attached to
underside of roof.
Install field-supplied
flashing at roof
opening.
Snow Clearance
18” (457mm)
minimum
(NOTE: Maximum
from concentric
adapter box is
48” (1219mm).
FIGURE 14 - Slide attached Combustion
Air Pipe up through the Roof