Reznor CAUA Unit Installation Manual - Manual (Page 13)

Form I-CAUA, P/N 164771 R8, Page 13
Requires a 5 to 4 inch (127 to
102mm) taper-type reducer a
maximum of 6” (152mm) from
the concentric adapter box.
6” (152mm)
diameter
single-wall
inlet air pipe
5” (127mm) diameter single-wall
or Category III vent pipe attaches
to the heater.
5” (127mm) diameter single-wall
inlet air pipe attaches to the heater.
4” (102mm)
inside diameter
double-wall
vent pipe
CAUA 150 and 200 - Top View
of Concentric Adapter Box
showing Pipe Connections
Requires a 4 to 5 inch (102 to 127 mm)
taper-type enlarger at the concentric
adapter box.
• Pipe diameters
do not differ;
no taper-type
connectors are
required.
FIGURE 6B - Concentric Adapter Box Connections for CAUA Size 250
8” (203mm)
diameter
single-wall
inlet air pipe
5” (127mm) diameter single-wall or
Category III vent pipe attaches to the heater.
5” (127mm)
inside
diameter
double wall
vent pipe
CAUA Size 250 - Top View of
Concentric Adapter Box
showing Pipe Connections
6” (152mm) diameter single-wall
inlet air pipe attaches to the heater.
Requires a 6 to 5 inch (152 to
127mm) taper-type reducer a
maximum of 6” (152mm) from
the concentric adapter box.
8” (203mm)
diameter
single-wall
inlet air pipe
5” (127mm)
inside diameter
double wall
vent pipe
6” (152mm) diameter single-wall
inlet air pipe attaches to the heater.
6” (152mm) diameter single-
wall or Category III vent pipe
attaches to the heater.*
CAUA Sizes 300, 350, and 400 -
Top View of Concentric Adapter
Box showing Pipe Connections
FIGURE 6C - Concentric Adapter Box Connections for CAUA Sizes 300, 350, & 400
• CAUA Sizes 300, 350,
and 400 always require
a 6” to 5” (152 to 127
mm) reducer in the
vent pipe.
Taper-type
Reducer
Airflow
• CAUA Sizes 150 and 200
always require a 5” to 4”
(127 to 102 mm) reducer
in the vent pipe.
Taper-type
Reducer
Airflow
• CAUA Sizes 150 and 200
always require a 4” to 5”
(102 to 127mm) enlarger
for attaching combustion
air pipe.
Taper-type
Enlarger
Airflow
FIGURE 6A - Concentric Adapter Box Connections for CAUA Sizes 150 & 200
Pipe Connections at the Concentric Adapter Box
Horizontal or Vertical?
Is the separated-
combustion vent/
combustion air
system horizontal
or vertical?
Horizontal
Terminal,
Option CC6,
instructions
begin on
page 14.
Vertical
Terminal,
Option CC2,
instructions
begin on page
17.