Reznor CAUA Unit Installation Manual - Manual (Page 22)

Form I-CAUA, P/N 164771 R8, Page 22
Use non-combustible supports on vent pipe. Support horizontal runs every six feet
(1.8M). Support vertical runs of Type "B" double-wall or Category III vent pipe in accor-
dance with the requirements of the pipe manufacturer. Support vertical single-wall pipe
in accordance with accepted industry practices. Do not rely on the heater for support
of either horizontal or vertical vent pipe.
5) Vent System
Support
FIGURE 16B - Attaching
Double-Wall (Type
B) Terminal Pipe to a
Single Wall or Category
III Vent Pipe Run
Figure 16B - STEP 1
On the single-wall pipe or Category
III pipe, place a continual 1/4 inch
bead of silicone sealant around the
circumference.
Figure 16B - STEP 2
Insert the pipe with the sealant into
the inner pipe of the double-wall pipe
until the bead of sealant contacts the
inner pipe creating a sealed joint.
Figure 16B - 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 over tighten screws.
FIGURE 16C - Attaching
Double-Wall (Type B)
Pipe to a Vent Cap
Figure 16C - 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 16C - STEP 2
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 over
tighten screw.
Insert the collar on the vent cap
inside the inner wall of the double-wall pipe.
Insert as far as possible. Add additional sili-
cone 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.
Figure 16C - STEP 3
Vent
Pipe
with
Sealant
from
STEP 1
Double-
Wall Pipe
Do STEP 2
immediately
following
STEP 1.
4) Joints and Sealing (cont'd)
Single-Wall
or Category
III Vent Pipe
Do STEP 2
immediately
after STEP 1.
6) Condensation Any length of single-wall vent pipe exposed to cold air or run through an unheated
area or an area with an ambient temperature of 45°F or less must be insulated along
its entire length with a minimum of 1/2" foil-faced fiberglass, 1-1/2# density insulation.
Where extreme conditions are anticipated, install a means of condensate disposal.
6. Mechanical
(cont'd)
6.2 Venting and
Combustion Air
(cont'd)
6.2.2 Venting and
Combustion Air
Requirements for
Power Vent (cont'd)
7) Vent Terminal (Pipe
and Vent Cap)
The vent system must be terminated with the type of vent cap approved for use with
this heater. The vent cap must be the same size as the vent pipe. Use of the vent cap