Reznor SDH Option - Installation - Venting Instructions - Manual (Page 5)

Form I-SDH-V, P/N 211410 R5, Page 5
Concentric Adapter Box
in Kits for SDH Sizes 75-125
Concentric Adapter Box
in Kits for SDH Sizes 150-400A
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 Combustion
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 5 - 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
below and P/N list on page 7
or page 9.
Diameter (inches) of Opening
for Vent Pipe
Size
75-125 150-400A
Horizontal 4-1/16" 5-1/16"
Vertical 4-21/32" 5-21/32"
Diameter (mm) of Opening for
Vent Pipe
Size
75-125 150-400A
Horizontal 103mm 129mm
Vertical 118mm 144mm
FIGURE 6 - Concentric
Adapter Box Airflow End View
showing Airflow Gray Arrows show
Flow of Combustion Air
Vent (exhaust gas) flows through
the field-supplied vent pipe
that extends straight through
the concentric adapter box.
(Collar for attaching indoor
combustion air pipe)
(Collar for attaching outdoor
combustion air pipe)
NOTE: Applies to both
horizontal and vertical
installations.
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 dif-
fer. Do NOT make actual connections until after reading the instructions and length
requirements for installing the vent/combustion air terminal kit. The requirement for
a reducer or increaser is the same for both vertical and horizontal terminals, but
the length of pipe required varies by installation.
FIGURE 7 - Concentric
Adapter Box
Connections for Model
SDH Sizes 75, 100, 125,
175, 200, 225, and 250
Model SDH 75, 100, 125, 175, 200, 225, and 250 - Pipe Diameters and
Connections Required at the Concentric Adapter Box
Concentric Adapter Box
“D” - diameter of the
single-wall inlet air pipe
that att
aches to the heater
.
“A” - diameter of vent pipe
(if vertical vent, pipe
must be double-wall)
“C”- diameter of single-wall inlet air pipe
“B” - diameter of the single-wall or
Category III vent pipe that attaches
to the heater.
• Pipe diameters do not differ.
Taper-type connectors are
not required for these sizes.
Pipe
Model SDH Sizes
75, 100, 125 175, 200, 225, 250
A 4" (102mm) 5" (127mm)
B 4" (102mm) 5" (127mm)
C 6" (152mm) 8" (203mm)
D 4" (102mm) 6" (152mm)