Reznor SCE Unit Installation Manual - Manual (Page 9)

Form RZ-NA I-SCE, Mfg #207697 Rev 7, Page 9
FIGURE 8 - Follow STEPS to
join Double-Wall (Type B)
Pipe and the Vent Terminal
Cap (horizontal or vertical)
Figure 8 - STEP 1
Place a continual 3/8” bead of silicone sealant
around the circumference of the vent cap col-
lar. This will prevent any water inside the vent
cap from running down the double-wall pipe.
Do STEP 2 immediately following STEP 1.
Figure 8 - 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” long
sheetmetal screw into the vent cap collar. Do not overtighten screw.
Figure 8 - STEP 3
(NOTE: Pipes and vent caps may
not look exactly as shown in the
illustrations. Instructions apply to
both horizontal and vertical vent
kits.)
FIGURE 9 - Follow STEPS
to join the Double-Wall (Type
B) Pipe to the Taper-type
Reducer that Joins it to the
Single-Wall or Category III
Vent Run
Figure 9 - STEP 1
On the taper-type reducer, place a con-
tinual 1/4” bead of silicone sealant
around the circumference.
Figure 9 - STEP 2
Insert the collar of the reducer into the
inner pipe of the double-wall pipe until
the bead of sealant contacts the inner
pipe creating a sealed joint.
Figure 9 - STEP 3
Spaced equally around the double-wall
pipe, drill three small holes below the
sealant ring. Insert 3/4 inch long
sheetmetal screws to secure the joint. Do
not overtighten screws.
Make this connection a maximum of 6" (152mm) from the concentric adapter box.
5" I.D.
Double-
Wall
Pipe
6" to 5" or
7" to 5"
Taper-
Type
Reducer
Do STEP 2
immediately
following
STEP 1.
• To seal joints in the single-wall combustion air pipe, secure slip fit pipe connections
using sheetmetal screws or rivets. Seal all joints with aluminum tape or silicone sealant.
• To seal joint in the terminal section of double-wall vent pipe (allowed ONLY ABOVE
the concentric pipes on a VERTICAL vent, follow the pipe manufacturer’s instructions
for joining and sealing double-wall vent pipe sections.
• When joining the terminal section of double-wall vent pipe to the vent cap, follow the
illustrated step-by-step instructions in FIGURE 8.
When joining the terminal section of double-wall vent pipe to a single-wall or Cat-
egory III vent pipe run, follow the illustrated step-by-step instructions in FIGURE 9.
5) Support
Support horizontal runs every six feet (1.8M). Support vertical runs of type "B" double-wall
or Category III vent pipe in accordance with the requirements of the pipe manufacturer.
Support single-wall vertical 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 double-wall vent
terminal pipe does not attach to the
concentric adapter box and must be
supported during installation.