Reznor UDBS Option - Installation - Separated Combustion Venting - Manual (Page 3)

Form I-UD-V-SC, PN195676R17, Page 3
1.1 Type of Pipe
All pipe is field supplied. Select installation type that applies. Requirements are listed
for both the vent pipe and the combustion air inlet pipe.
1.1.1 Residential Installation - Pipe Requirements
NOTE: Only UDAS 30, 45, 60, 75, 100, and 125 are certified for residential use.
1.1.2 Commercial/Industrial Installation - Pipe Requirements
Horizontal or Vertical
Vent Pipe Run
Vent pipe approved to UL Std 1738 for a Category III appliance is required.
The horizontal section of pipe in the vent terminal that extends through the box
and runs concentric through the combustion air pipe must be one-piece with no
joints.
Horizontal Vent Terminal
(using Option CC6 Kit)
Vertical Vent Terminal
(using Option CC2 Kit)
Double-wall vent pipe approved to UL Std 1738 for a Category III appliance is
required The section of pipe in the vent terminal that extends through the box
and runs concentric through the combustion air pipe must be one-piece with no
joints.
Combustion Air Inlet Pipe
(Options CC2 & CC6)
Sealed, single-wall galvanized pipe is recommended for inlet air run and terminal
combustion air pipe.
1.2 Venter Outlet and
Combustion Air
Inlet
FIGURE 1 - Rear of Heater showing
Location of Inlet and Outlet
Connections
Note: Small unit is illustrated. Larger units have
slightly different orientation.
Inlet Air
Collar Venter
Outlet
TABLE 1 - Heater Connections (diameter)
UDAS and
UDBS
30, 45, 60,
75, 100, 125
150, 175, 200,
225, 250,
300, 350,
400
Venter
Outlet
4” (102mm) 5” (127mm) 6” (152mm)
Inlet Air
Collar
4” (102mm) 6” (152mm) 6” (152mm)
Special Requirements
at the Heater
Connections
• Sizes 30, 45, and 60 - When using 3” diameter pipe, a 4” to 3” (102 to 76mm)
taper-type reducer is required at the venter outlet. For Category III, attach a 4”
appliance adapter from Category III pipe manufacturer directly to the collar, then
use a reducer if using 3” pipe.
• Sizes 30, 45, and 60 - When using 3” diameter pipe, a 3” to 4” (76 to 102mm)
taper-type increaser is required at the inlet air collar.
• Sizes 200, 225, 250, 300, 350, and 400 require a minimum of 12” (305 mm) of
straight pipe at both heater connections.
Horizontal or Vertical Vent
Pipe Run
Vent pipe approved for a Category III appliance OR single-wall, 26-gauge or
heavier galvanized or equivalent vent pipe is required between the heater and
the concentric adapter box.
The horizontal section of pipe in the vent terminal that extends through the box
and runs concentric through the combustion air pipe must be one-piece with no
joints.
Horizontal Vent Terminal
(using Option CC6 Kit)
Vertical Vent Terminal
(using Option CC2 Kit)
Double-wall (Type B) vent pipe is required for the vertical vent terminal. The
section of pipe in the vent terminal that extends through the box and runs
concentric through the combustion air pipe must be one-piece with no joints.
Combustion Air Inlet Pipe
(Options CC2 & CC6)
Sealed, single-wall galvanized pipe is recommended for inlet air run and terminal
combustion air pipe.