Reznor SC Duct Furnace Unit Installation Manual - Manual (Page 16)

Form I-SC, P/N 207696 R11, Page 16
HORIZONTAL VENT INSTRUCTIONS (cont’d)
16” (406mm)
minimum
24” (610mm)
maximum
Concentric
Adapter
Box
Wall
Screened
Exhaust
Cap
Inlet Air
Guard Combustion Air to Heater (seal joints)
Vent (Flue Exhaust) Pipe
from heater (seal joints)
Heater
Distance between the
Concentric Adapter Box
and the Heater
For Maximum Length,
see Table on page 11.
Minimum length is 5 ft (1.5M).
Attach double-vent pipe to vent run no
more than 6” (152mm) from the box. A
taper-type reducer is required.
2” (51mm) if wall is combustible
Attach box to wall with brackets.
One piece of
Double-Wall
Vent Pipe
2” (51mm)
6”
(152
mm)
1” (25mm)
minimum
48”
(1219mm)
maximum
Top View
FIGURE 12 - Installation
of a Typical Separated-
Combustion Unit with
Horizontal Vent and
Combustion Air Pipes
(Option CC6)
6.3 Venting and
Combustion Air
(cont'd)
6.0 Mechanical
(cont'd)
between 16" (406mm) and 24” (610mm) past the end of the combustion air pipe and
no more than 6” (152mm) out of the box toward the heater.
Use a taper-type reducer to attach the 5" double-wall vent pipe to the 6" or 7" single-
wall or Category III vent pipe run. Follow the instructions in FIGURE 7, page 11.
8. Attach the exhaust (vent) cap to the end of the vent pipe. Align the cap so that
its baffle strips are positioned on the horizontal and vertical centerlines (See FIGURE
12). Follow the instructions in FIGURE 6, page 11, to attach the exhaust cap. (NOTE:
If vent pipe is inserted from outside, cap may be attached before the double-wall vent
pipe is installed. If cap is attached first, be sure the baffle strips are positioned cor-
rectly when attaching the vent terminal pipe to the vent run.)
9. Seal the vent pipe. Verify that the double-wall section of vent pipe has a slight
downward drop (1/4” per foot/6mm per 305mm) toward the vent terminal end. Use sili-
cone sealant and seal the circumference of the pipe and the opening of the box. Seal
the area around the pipe completely.
6-15/16” (176mm)
Concentric Adapter Box
Double-Wall
Vent Pipe -
Pitch to
Drain
Thimble
Combustion Air Pipe - Pitch to Drain
3 ft (1M)
minimum
3 ft (1M)
minimum
6 ft (1.8M) minimum
Adjoining Building
Building Projection
Building Overhang
W a l l
Inlet Air
Guard
Exhaust (Vent) Cap
IMPORTANT: Install exhaust cap so the baffles
are positioned at 12:00, 3:00, 6:00, and 9:00 o’clock.
Side View