Reznor UDBS Option - Installation - Separated Combustion Venting - Manual (Page 5)

Form I-UD-V-SC, PN195676R17, Page 5
Applies to: Residential or Commercial/Industrial Installation
NOTE: Only UDAS 30, 45, 60, 75, 100, and 125 are certified for residential use.
FIGURE 2 - Follow STEPS to join Double-Wall (Type B) Pipe and the Vent Terminal Cap
(applies only to vertical vent/combustion air kit Option CC2)
FIGURE 2 - STEP 1
Place a continual 3/8” bead of silicone sealant
around the circumference of the vent cap
collar. This will prevent any water inside the
vent cap from running down the double-wall
pipe.
FIGURE 2 - STEP 2
Insert the collar on the vent cap inside
the inner wall of the double-wall pipe.
Insert as far as possible. Add additional
silicone sealant to fully close any gaps
between the vent cap and the double
wall pipe. This is necessary to prevent
water from entering the double-wall pipe.
Secure the vent cap to the double-wall
pipe by drilling and inserting
a 3/4” (19mm) long sheetmetal screw
into the vent cap collar.
Do not overtighten screw.
FIGURE 2 - STEP 3
FIGURE 3 - Follow STEPS to join Double-Wall (Type B) Pipe to a Single-Wall Vent Pipe Run
(NOTE: Comply with pipe requirements on page 3.)
Do STEP 2
immediately
following
STEP 1.
FIGURE 3 - STEP 1
On the single-wall pipe or
taper-type connector, place
a continual 1/4” bead of
silicone sealant around the
circumference.
Do STEP 2 immediately
following STEP 1.
FIGURE 3 - STEP 2
Insert the pipe prepared with sealant
into the inner pipe of the double-
wall pipe until the bead of sealant
contacts the inner pipe creating a
sealed joint.
FIGURE 3 - STEP 3
Spaced equally around the double-wall
pipe, drill three small holes below the
sealant ring. Insert 3/4 inch (19mm) long
sheetmetal screws to secure the joint. Do
not overtighten screws.
Double-
Wall Pipe
Single-Wall Pipe with
Sealant (STEP 1)
1.5 Support Support horizontal run every six feet (1.8M).
Support vertical run of Category III vent pipe in accordance with the requirements of
the pipe manufacturer.
Support vertical single-wall pipe in accordance with accepted industry practices.
Do not rely on the heater or the adapter box for support of either horizontal or vertical
pipes. Use non-combustible supports on vent pipe.
NOTE: The vertical vent terminal pipe does not attach to the concentric adapter box
and must be supported during installation.
1.6 Clearance
Do not enclose the vent pipe or place pipe closer than 6” (152mm) to combustible
material.