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CARBON MONOXIDE POISONING HAZARD.
FaiIure to follow this warning could result in death or
personal injury.
Do NOT operate furnace in a corrosive atmosphere
containing chlorine, fluorine or any other damaging
chemicals, which could shorten furnace life.
Refer to 3
. Combustion & Ventilation Air
section,
Contaminated Combustion Air
for combustion air
evaluation and remedy.
!
WARNING
Furnace Installation Considerations
The installation of the furnace for a given application will dictate the
position of the furnace, the airflow, ductwork connections, vent and
combustion air piping. Consideration must be given to the follow-
ing:
Condensate Trap and Drain Lines
The supplied condensate trap must be attached to the furnace
side panel on either the left or right side. For horizontal installa-
tions, the drain trap is vertically attached to the side panel below
the furnace. A minimum clearance of 6
²
below the furnace is re-
quired for the condensate trap. Downward slope of the conden-
sate drain line from the condensate trap to the drain location must
be provided. Adequate freeze protection of the drain trap and the
drain line must be provided. See “
Condensate Drain Trap”
section
for further details.
Leveling
Proper leveling of the furnace must be provided to insure proper
drainage of the condensate from the furnace. The furnace must be
level to within
1
/
4
²
from front to back and from side to side for upflow
and downflow installations or top to bottom for horizontal installa-
tions.
Vent and Combustion Air Connections
On the Dual Certified furnace, the vent and combustion air pipes
attach to the furnace through the top panel for the upflow and hori-
zontal installations. For the downflow installation, the vent and
combustion air pipes attach to the furnace through the alternate
locations on the furnace side panels.
Note: On the Direct Vent furnace, the vent pipe attaches to the fur-
nace through the side panels. The combustion air pipe attaches to
the top panel or to the alternate location on the side panel.
On the Single Pipe furnace, the vent pipe attaches to the furnace
through the furnace side panels.
Note: Repositioning of the combustion blower is required for the
vent pipe connection to the furnace through the “right side” panel.
See “
Vent and Combustion Air Piping”
section for further details.
Horizontal Furnace Installation
Inlet Pipe
(not used on Single Pipe model)
Typical Horizontal Installation
Figure 3
Vent
Pipe
Condensate
Trap
NOTE: 5
²
bottom clearance required for condensate trap.
25--23--34
This furnace can be installed horizontally in an attic, basement,
crawl space, alcove, or suspended from a ceiling in a basement or
utility room (See
Figure 3
).
Do not
install furnace on its back or in
the reverse airflow positions as safety control operation will be ad-
versely affected.
If the furnace is to be suspended from the floor joists in a crawl
space or the rafters in an attic, it is necessary to use steel pipe
straps or an angle iron frame to rigidly attach the furnace to prevent
movement. These straps should be attached to the furnace with
sheet metal screws and to the rafters or joists with bolts. The pre-
ferred method is to use an angle iron frame bolted to the rafters or
joists. (Take caution to allow door panels to be removed for mainte-
nance)
If the furnace is to be installed in a crawl space, consult local
codes. A suitable concrete pad or blocks are recommended for
crawl space installation on the ground.
NOTE: 6
²
bottom clearance required for condensate trap.
Twenty four (24) inches between the front of the furnace and adja-
cent construction or other appliances
MUST
be maintained for ser-
vice clearance. (Thirty (30) inches is required to remove furnace).
Keep all insulating materials clear from louvered door. Insulating
materials may be combustible.
The horizontal furnaces may be installed directly on combustible
wood flooring or supports as long as all required furnace clear-
ances are met. See
Figure 3.
This furnace
MUST NOT
be installed directly on carpeting or tile or
other combustible material other than wood flooring or supports.
For horizontal installation over a finished living space. A field fabri-
cated auxiliary drain pan with drain pipe is required to prevent
damage by overflow due to blocked condensate drain.
Summary of Contents for *9MPT050F12
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