Reznor LDAP Unit Installation Manual - Manual (Page 17)

Form I-LDAP, P/N 207733R6, Page 17
2) Vent Pipe Diameter
and Length
• Use only one diameter of vent pipe on an installation.
• Minimum vent length is 3 feet (1M).
• Minimum of 1 ft (0.3M) of vertical vent required on venter outlet before
installing an elbow.
Vent pipe diameters and maximum vent lengths in the table apply to both Hori-
zontal and Vertical vents. Add all straight sections and equivalent lengths
for elbows. The total combined length must not exceed the Maximum Vent
Length.
Model
LDAP
Size
Venter
Outlet
Diameter
Vent Pipe
Diameter
Maximum
Vent
Length 1
Equivalent
Straight Length
for 90° Elbow
Equivalent
Straight Length
for 45° Elbow
Field-Supplied Taper Type
Connection Required at the
Venter Outlet
inches mm inches mm feet M feet M feet M
400 6 152
6 152 45 13.7 15 4.6 7.5 2.3 None
7 178 60 18.3 8 2.4 4 1.2 6” to 7” (152 to 178mm) Increaser
800 8 203
8 203 50 15.2 15 4.6 7.5 2.3 None
10 254 45 13.7 5 1.5 2.5 0.8 8” to 10” (203 to 254mm) Increaser
1200 8 203
8 203 50 15.2 15 4.6 7.5 2.3 None
10 254 45 13.7 5 1.5 2.5 0.8 8” to 10” (203 to 254mm) Increaser
1 Includes one 90° elbow at venter outlet.
3) Venter (Flue) Outlet Venter Outlet Attachment Requirements:
Depending on the size of vent
pipe as determined in Require-
ment 2), attach either the vent
pipe directly to the venter col-
lar or a taper-type enlarger.
4) Joints and Sealing
Provide field-supplied vent pipe as specified in Requirement No. 1.
• If using single wall, 26-gauge or heavier galvanized pipe, secure slip-fit
connections using sheetmetal screws or rivets. Seal pipe joints either with
tape suitable for 550°F (such as Option FA1, P/N 98266) or high-tempera-
ture silicone sealant.
• If using Category III vent pipe, follow pipe manufacturer’s instructions for
joining pipe sections. When attaching Category III pipe to the venter outlet
or the vent cap, make secure, sealed joints following a procedure that best
suits the style of Category III pipe being used.
• If installing a double-wall (Type B) terminal pipe, follow the instructions
in FIGURE 10C to join the double-wall pipe to a single-wall or Category III
vent pipe run. To attach the vent cap, follow instructions in FIGURE 10B.
• If using double-wall (Type B) vent pipe in the vent pipe run (at least 75%
of the equivalent vent length must be vertical), follow the pipe manufactur-
er’s instructions for joining pipe sections. For attaching double-wall pipe to
the heater, see FIGURE 10A. To attach the vent cap, see FIGURE 10B.
Taper-type
Pipe Diameter
Increaser Airflow
Follow instructions in Requirement 4). below to make
the connection for the type of pipe being used.
Model
LDAP
Size
Venter Outlet
Diameter
inches mm
400 6 152
800 8 203
1200 8 203
FIGURE 10A -
Attaching
Double-Wall
(Type-B) Vent
Pipe to the
Venter Outlet
A double-wall
pipe run is
allowed only if
at least 75% of
the vent length is
vertical.
Figure 10A - STEP 1
To secure the connection,
spaced equal distance
around the pipe, drill and
insert three 3/4” long sheet-
metal screws through the
pipe and into the collar. Do
not over tighten the screws.
Venter
Collar
Double-
Wall
Pipe
Slide the
double-
wall pipe
over the
collar so
that the
collar is
inside the
inner pipe.
Figure 10A - STEP 2
Fill inside the pipe, around the collar, with sili-
cone sealant being sure there are no gaps.