Reznor SCE Unit Installation Manual - Manual (Page 7)

Form RZ-NA I-SCE, Mfg #207697 Rev 7, Page 7
(1) Flanges on the furnace (heat exchanger) turn out as shown. ( 2) Shape duct connection as
shown -- "U" on top and bottom; "L" on sides. (3) Slide "U" channels over furnace top and
bottom flanges making connection. ( 4) Form "U" channels to seal sides. Drill and lock with
sheetmetal screws.
FIGURE 7B - Install "U"
Channel on Sides of Duct
Connection
FIGURE 7A - Connecting
Ductwork to the Furnace
9. Venting and
Combustion Air
All separated combustion, power vented units MUST BE equipped with both combustion air
and exhaust piping to the outdoors. The unique concentric adapter box designed for use
with this heater allows for both combustion air and exhaust piping with only one horizontal
or vertical penetration hole in the building.
These instructions apply to installation and use of the concentric adapter and vent/combus-
tion air kit (Option CC2 or CC6) designed for use with all Reznor separated-combustion
products. The systems illustrated in this manual are the only venting/combustion air sys-
tems approved for these separated combustion units. Do not use this concentric adapter box
with any other products.
WARNING: Do not use an
existing venting system.
This heater requires
installation of the
combustion air/vent system
ordered with the unit (either
Option CC2 or Option
CC6).
Installation should be done by a qualified agency in accordance with these instructions. The
qualified service agency installing this separated-combustion system is responsible for the
installation.
Hazards of Chlorine - The presence of chlorine vapors in the combustion air of gas-fired
heating equipment presents a potential corrosion hazard. Chlorine found usually in the form
of freon or degreaser vapors, when exposed to flame, will precipitate from the compound, and
go into solution with any condensation that is present in the heat exchanger or associated
parts. The result is hydrochloric acid which readily attacks all metals including 300 grade
stainless steel. Care should be taken to separate these vapors from the combustion process.
This may be done by wise location of unit vent terminal and combustion air inlet with regard
to exhausters or prevailing wind directions. Remember, chlorine is heavier than air. This fact
should be kept in mind when determining installation location of these heaters and building
exhaust systems.
WARNING: SC Series separated combustion units are not designed or
approved for use in atmospheres containing flammable vapors or
atmospheres highly laden with chlorinated vapors. See Hazard Levels,
page 2.
CAUTION: Joint where supply air duct attaches to the furnace must
be sealed securely to prevent air leakage into drafthood or burner
rack area. Leakage can cause poor combustion, pilot problems, shorten
heat exchanger life, and cause poor performance. See Hazard levels,
page 2.
• Return Air Duct/Furnace Connection - All return air ducts should be attached and
sealed to return air flanges to provide airtight connection.
• Return Air Duct/Grill Size - Make certain that return air ducting or grills have a free
area equal to the return duct size connection.