Reznor SC Duct Furnace Unit Installation Manual - Manual (Page 13)

Form I-SC, P/N 207696 R11, Page 13
When pipe diameters differ, depending on direction of airflow, join the pipes with either
a taper-type reducer or enlarger. Refer to illustrations in FIGURE 9A and 9B for pipe
connection requirements at the concentric adapter box.
Do
NOT make actual connections until after reading the instructions and length require-
ments for installing the vent/combustion air kit. The box connection requirements
are the same for both vertical and horizontal systems, but the length of the dou-
ble-wall pipe varies by installation.
Pipe Connections at the
Concentric Adapter Box
FIGURE 9A - Concentric
Adapter Box
Connections - 6" Pipe
Requires a 6 to 5 inch (152 to 127mm)
taper-type reducer a maximum of 6”
(152mm) from the concentric adapter box.
6” (152mm) diameter single-wall
inlet air pipe attaches to the heater
5” (127mm)
inside diameter
double-wall
vent pipe
Top View of Concentric Adapter
Box showing Pipe Connections
6” (152mm) diameter single-wall
or Category III vent pipe attaches
to the heater
8” (203mm)
diameter
single-wall
inlet air pipe
Model SC 100-400 - Pipe diameters and connections required at the
concentric adapter box when using 6” pipes between the furnace and
the box
• If using 6” diameter
pipes, Model SC 100-
400 always require a 6”
to 5” (152 to 127 mm)
reducer in the vent pipe.
Taper-type
Reducer
Airflow
• If using 7” diameter
pipes (allowed on Sizes
200-400), Models SC
200-400 always require a
7” to 5” (178 to 127 mm)
reducer in the vent pipe
and a 6” to 7” (152 to 178
mm) enlarger for attach-
ing the combustion air
pipe.
Requires a 7 to 5 inch (178 to 127mm)
taper-type reducer a maximum of 6”
(152mm) from the concentric adapter box.
7” (178mm) diameter single-wall
inlet air pipe attaches tot he heater
5” (127mm)
inside diameter
double-wall
vent pipe
Top View of Concentric Adapter
Box showing Pipe Connections
7” (178mm) diameter single-wall
or Category III vent pipe attaches
to the heater
8” (203mm)
diameter
single-wall
inlet air pipe
Models (H)SC 200-400 - Pipe diameters and connections required at the
concentric adapter box when using 7” pipes between the furnace and
the box
Requires a 6 to 7 inch (152 to 178mm)
taper-type enlarger at the concentric
adapter box.
Taper-type
Reducer
Airflow
Taper-type
Enlarger
Airflow
FIGURE 9B - Concentric Adapter Box Connections - 7" pipe
Horizontal,
Option CC6,
instructions
begin on page 14.
Vertical,
Option CC2,
instructions
begin on
page 17.
Follow the
instructions for
the Vent Terminal
being installed:
Is the Vent Terminal HORIZONTAL OR VERTICAL?