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ATTIC INSTALLATION
Line contact is permissible for furnaces installed in
horizontal positions. The intersection of furnace top and
sides forms a line as shown in Figure 6. This line may be in
contact with combustible material.
Figure 6. Typical Attic Installation.
Install a platform under furnace that extends a minimum 30
inches in front of furnace. This provides a work area and
keeps insulating materials away from combustion air
openings. Secure platform to joists.
Note: In horizontal position, condens ate trap hangs as low
as 5 inches below furnace. Provisions must be made for
condensate trap and drain lines. See Section 5 for details
on condensate trap installation.
WARNING:
Some insulating materials are
combustible. When a furnace is installed in an attic or other
insulated space, keep all insulating materials at least 12
inches away from furnace and all burner combustion air
openings. Failure to do so could cause fire.
CRAWL SPACE INSTALLATION
Furnace can be hung from floor joists or installed on
suitable blocks or pad. Pad or blocks must provide enough
height to eliminate potential for water damage. Maintain
clearances listed in Figure 5.
SUSPENDING FURNACE
Some installations require that the furnace be suspended
from rafters or floor joists. A common way to do this using
threaded rods is shown in Figure 7. Consider this means
when people may walk underneath furnace. Other means
that provide adequate support may be used.
Level furnace from front to back and from left to right and
maintain clearances as described previously.
Page 6
Figure 7. Suspending Using Threaded Rod.
SECTION 4. PROVIDING VENTING
AND COMBUSTION AIR
This furnace must be connected to a plastic venting system
adequate to remove flue gases to the outside atmosphere.
It must be vented in accordance with these instructions and
local building codes.
The furnaces covered by this manual are design-certified
as Category IV appliances. Category IV appliances operate
with a positive vent static pressure and with a flue-gas
temperature that will produce significant condensate in the
vent. The vent system for this furnace must be installed so
as to prevent leakage of flue gases into the building. This
furnace may be installed using either direct venting or non-
direct venting.
WARNING: Do not connect this furnace to a vent
system shared by any other appliance. Do not connect it to
any other type of vent system other than described by these
instructions.
Improper venting could allow com bustion
products to collect in building during use resulting in nausea
or death by asphyxiation.
GENERAL VENTING GUIDELINES
??
Vent system and combustion air supply components
must be constructed of schedule 40 PVC, PVC-DWV,
SDR26, SDR21 or ABS plastic. Use pipe, fittings,
sealants, and installation procedures that conform to
the following ANSI/ASTM standards:
PVC
SDR26, SDR21
PVC-DWV
PVC-DWV CELLULAR CORE
PVC Primer And Solvent Cement
ABS Pipe And Fittings
Procedure For Cementing Joints
??
All condensate formed in the vent must run back
toward furnace for proper drainage. Install vent pipe
with no less than a 1/4 inch per foot slope toward
furnace from vent terminal.
ASTM D-1785
ASTM D-2241
ASTM D-2665
ASTM F-891
ASTM D-2564
ASTM D-2235
ASTM D-2855
Installer's Information Manual
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