Reznor UDBS Option - Installation - Separated Combustion Venting - Manual (Page 7)

Form I-UD-V-SC, PN195676R17, Page 7
Applies to: Residential or Commercial/Industrial Installation
NOTE: Only UDAS 30, 45, 60, 75, 100, and 125 are certified for residential use.
Concentric Adapter Box in Kits
for UDAS/UDBS Sizes 30-125
Concentric Adapter Box in Kits
for UDAS/UDBS Sizes 150-400
Top View Top View
Heater Side View Heater Side View
4” dia.
Combustion
Air Collar
6” Combustion
Air Collar
Opening for
5” vent pipe
to pass through the box --
See TABLE on the left.
Opening
for 4” vent
pipe to pass through the
box - See TABLE, left.
2” (51mm)
2” (51mm)
6-1/32”
(153mm)
6” dia Collar for
Combustion Air
8” dia Collar
for Combus-
tion Air
11”
(279mm)
3-5/8”
(92mm)
4-3/8”
(111mm)
11-3/32” (282mm)
4”
(102mm)
3-1/16”
(78mm)
14-1/4”
(362mm)
5”
(127mm)
5-7/32”
(133mm)
5-9/32”
(134mm)
4”
(102mm)
13-3/8” (340mm)
FIGURE 6 - Concentric
Adapter Box Dimensions
NOTE: Horizontal and vertical kits
do not use the same adapter box.
The only difference is the diameter
of the opening in the box for the
vent pipe. A vertical vent requires
double-wall pipe and a slightly
larger opening through the box.
See TABLE 4 below and P/N list on
page 9 or page 12.
TABLE 4 - Diameter of Opening in the
Box for Vent Pipe to Pass Through
Vent Terminal
Configuration
Sizes 30-125 Sizes 150-400
inches mm inches mm
Horizontal
(Option CC6)
4-1/16 103 5-1/16 129
Vertical
(Option CC2) 4-21/32 118 5-21/32 144
Pipe Connections
at the Concentric
Adapter Box
When pipe diameters differ, depending on direction of airflow, join the pipes with either
a taper-type reducer or increaser. Requirements vary depending on the size of the
heater; refer to FIGURE 7, 8, or 9 to determine whether or not pipe diameters differ. Do
NOT make actual connections until after reading the instructions and length require-
ments for installing the vent/combustion air kit (Paragraph 2.0 or 3.0). The connec-
tion requirements are the same for both vertical and horizontal systems, but the
length of pipe required varies by installation.
• If using 3” (76mm)
diameter pipes, Sizes
30, 45, and 60 require a
3” to 4” (76 to 102mm)
taper-type increaser in
the vent pipe.
Concentric
Adapter Box
Install a 3 to 4 inch
(76 to 102mm) taper-type
pipe diameter increaser a
maximum of 6” (152mm)
from the concentric adapter box.
If using 3” (76mm) pipe,
install 4 to 3 inch (102 to
76mm) taper-type pipe
diameter reducer at the
inlet air collar on the
concentric adapter box.
Models UDAS and
UDBS 30, 45, and 60 -
Pipe Diameters and
Connections Required at
the Concentric Adapter
Box When Using 3”
(76mm) Diameter Pipes
4” (102mm) diameter vent pipe
(Type of vent pipe must comply with
requirements on page 3.)
6” (152mm) diameter
single-wall inlet air pipe
3” (76mm) diameter
single-wall inlet air pipe
3” (76mm) diameter
vent pipe *
* Type of vent pipe must comply with
requirements on page 3.
• If using 3” (76mm)
diameter pipes, Sizes
30, 45, and 60 require a
4” to 3” (102 to 76mm)
taper-type reducer on
the combustion air pipe
collar.
FIGURE 7 - Concentric Adapter Box Connections for Sizes 30,
45, and 60 using 3” (76mm) diameter pipes