Reznor SFT Unit Installation Manual - Manual (Page 9)

Form RZ -NA-I-SFT, Page 8
9. Venting and Combustion Air (cont'd)
Installation Requirements for Option CC6 (cont'd)
2” (51mm)
approx plus
wall thickenss
Vent Pipe - if a
reducer is required
in the vent pipe;
the connection
must be no more
than 6” (152mm)
from the box.
Collar for combustion
air pipe.
Seal the seam in the vent pipe.
16” (406mm) minimum
Combustion air pipe
Field-supplied mounting brackets
Concentric
Adapter Box
Install rubber seal in
vent pipe opening.
Vent Flow
Combustion
Air Flow
Installation Instructions for Option CC6
1. Determine the location on the outside wall for the vent terminal.
In most applications, the terminal would be on a level with the heater
mounting height as shown in Figure 6D. Allow 1/4" per foot down-
ward pitch for condensate drain.
The distance of the termination of the horizontal vent from adjacent
public walkways, adjacent buildings, openable windows, and building
openings must be in accordance with local codes or, in the absence of
local codes, must conform with National Fuel Gas Code Z223.2. Local
codes supersede all provisions in these instructions and in the National
Fuel Gas Code. Minimum clearances for the horizontal vent terminal
are shown in the table below.
Field-supplied installation requirements:
•
Thimble (a thimble is not required if wall is of non-combustible
construction)
• Flashing
• Vent pipes (see requirements on pages 6-7)
• Combustion air pipes (see requirements on page 7)
• Mounting brackets for concentric adapter box (or box may be
mounted flush, depending on building construction)
• Taper-type reducers and/or enlargers as required (see require-
ments on page 7)
S tructure
Forced air inlet within 10
ft (3.1m)
3 ft (0.9m) above
Combustion air inlet of
another app liance
6 ft (1.8m)
4 ft (1.2m) horizontally
4 ft (1.2m) below
1 ft (30cm) above
Electric meter, gas meter *
and relief equipment 4 ft (1.2m)
horizontally
Gas regulator * 3 ft (0.9m)
Adjoining building or
p arap et
6 ft (1.8m)
Adjacent public walkway s 7 ft (2.1m) above
Grade (ground level)
7 ft (2.1m) above
Door, window, or gravity
air inlet (any building
opening)
Minimum Clearances for Vent Termination
Location (all directions unless specified)
*Do not terminate the vent
directly above a gas meter or
service regulator.
Products of combustion can cause discoloring of some building fin-
ishes and deterioration of masonry materials. Applying a clear silicone
sealant that is normally used to protect concrete driveways can protect
masonry materials. If discoloration is an esthetic problem re-locate the
vent or install a vertical vent.
2. Prepare clearance hole through the outside wall for a 6" diameter
pipe (Sizes 45-250) or an 8" diameter pipe (Size 300). Outside wall
construction thickness should be between 1" (25mm) minimum and
30" (762mm) maximum. The larger diameter combustion air pipe serves
as clearance for the vent pipe on non-combustible construction. A
thimble may or may not be required depending on wall construction
and/or local codes.
3. Prepare the concentric adapter box.
3a) Determine whether field-supplied brackets are required. The
box must be positioned so that the distance from the outside of the
wall to the box is a minimum of 12" (305mm). Maximum distance
is 60" (1524mm). If brackets are used, box should be angled slightly
to allow for downward pitch of pipes. If used, attach brackets se-
curely; do not leave any unsealed holes in the adapter box. If brackets
are not used, when the box is installed, it should be against the
wall.
3b) Install the rubber seal and the vent pipe. Locate the vent pipe
opening and place the rubber seal around and over the edge of the
metal.
Determine the length of the sec-
tion of vent pipe by adding the
requirements. The vent pipe
must extend a maximum of 6"
(152mm) on the heater side (if
a reducer is required); plus 6"
(152mm) through the box; plus
bracket length; plus the width
of the wall; plus a minimum of
18" (457) on the outside (if the
inlet pipe extends 2" (51mm)
beyond the wall).
Lubricate the seal and pipe with liquid soap or a rubber lubricant.
(Installation Tip: Spray cooking oil works well as a lubricant for
this task.)
Being sure the pipe is in the proper flow direction, slide the end
through the box and push it out through the rubber seal. Push evenly
using caution not to displace the seal from its position on the edge
of the hole. If the rubber seal moves, slide the pipe back slightly,
re-position the seal, and slide the pipe through again.
Worksheet - Determine Length of
Vent Pipe through the Box
inches mm
Heater Side (max if + 6 152
different diameters)
Width of Box
+ 6 152
Bracket Length + __ ___
Width of Wall + __ ___
Terminal Side (min) + 18 457
Length of Pipe =
6A
WARNING: All vent terminals must be positioned
or located away from fresh air intakes, doors and
windows to preclude combustion products from
entering occupied space. See Hazard Levels, page 2.
Install the vent pipe
by inserting it into the
terminal side of the
box and pushing it out
through the seal on
the heater side.
NOTE: Be sure flow
direction of vent pipe
is correct.