Reznor LDAP Unit Installation Manual - Manual (Page 18)

Form I-LDAP, P/N 207733R6, Page 18
Support horizontal vent 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 pipe in accordance with accepted
industry practices. Do not rely on the heater for support of either horizontal or
vertical vent pipe. Use non-combustible supports on vent pipe.
5) Vent System
Support
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.
FIGURE 10C -
Attaching Double-
Wall (Type B)
Terminal Pipe to
a Single Wall or
Category III Vent Pipe
Run
Figure 10C - STEP 1
On the single-wall pipe or Cat-
egory III pipe, place a continual
1/4 inch bead of silicone sealant
around the circumference.
Do STEP 2 immediately after
STEP 1.
Figure 10C - 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 10C - 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.
Vent
Pipe
with
Sealant
Double-
Wall
Pipe
Single-
Wall or
Category
III Vent
Pipe
Figure 10B - 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 10B - 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 addi-
tional 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.
Figure 10B - STEP 3
Do STEP 2
immediately
following
STEP 1.
FIGURE 10B - Attaching Double-Wall (Type B) Pipe to a Vent Cap
4) Joints and Sealing (cont’d)
6.0 Mechanical
(cont’d)
6.3 Venting (cont’d)