Reznor UDBS Option - Installation - Separated Combustion Venting - Manual (Page 8)

Form I-UD-V-SC, PN195676R17, Page 8
Applies to: Residential or Commercial/Industrial Installation
NOTE: Only UDAS 30, 45, 60, 75, 100, and 125 are certified for residential use.
1.0 Venting and Combustion Air Requirements (cont’d)
1.8 Concentric Adapter Box (cont’d)
FIGURE 8 - Concentric Adapter Box Connections for Sizes 30, 45, and 60 using 4”
(102mm) diameter pipes and for all Sizes 75, 100, 125, 150, 175, 200, 225, and 250
Models UDAS and UDBS 30, 45,
and 60 - Pipe Diameters and
Connections Required at the
Concentric Adapter Box When
Using 4” (102mm) Diameter
Pipes from the Heater to the
Concentric Adapter
AND
Models UDAS and UDBS 75,
100, 125, 150, 175, 200, 225,
and 250 - Pipe Diameters and
Connections Required at the
Concentric Adapter Box
Concentric
Adapter Box
“B” = diameter of vent
pipe that att
aches to the
heater
. Type of pipe must comply with requirement
s
on page 3.
“D” = diameter of the
single-wall inlet air pipe
that att
aches to the heater
.
“C” = diameter of single-wall inlet air pipe
“A” = diameter
of the vent pipe
(Type of vent pipe
must comply with
requirements on
page 3.)
• Pipe diameters
do not differ.
Model UDAS and UDBS Sizes A B C D
30, 45, 60 with 4” vent and combustion air
runs from heater to concentric adapter box
inches 4 4 6 4
mm 102 102 152 102
75, 100, 125
inches 4 4 6 4
mm 102 102 152 102
150, 175, 200, 225, 250
inches 5 5 8 6
mm 127 127 203 152
FIGURE 9 - Concentric Adapter Box Connections for Sizes 300, 350, and 400
Models UDAS and
UDBS 300, 350, and
400 - Pipe Diameters
and Connections
Required at the
Concentric Adapter Box
Requires a 6 to 5 inch (152 to 127mm) taper-type
pipe diameter reducer a maximum of
6” (152mm) from the concentric adapter box.
5” (127mm) diameter vent pipe (Type of pipe
must comply with requirements on page 3.)
8” (203mm)
diameter
single-wall
inlet air pipe
6” (152mm) diameter
single-wall inlet air pipe
attaches to the heater
.
6” (152mm) diameter vent
pipe att
aches to the heater
.
Type of pipe must comply
with requirement
s on p
age 3.
Concentric
Adapter Box
• Sizes 300, 350, and
400 always require
a 6” to 5” (152 to 127
mm) taper-type reducer
in the vent pipe.