Sears 9MPD125L20B1 - Manual (Page 7)

This furnace can be installed in an upflow, horizontal (either left or
right) or downflow airflow position. DO NOT install this furnace on
its back. For the upflow position, the return air ductwork can be at­
tached to either the left or right side panel and/or the bottom. For
horizontal and downflow positions, the return air ductwork must be
attached to the bottom. The return air ductwork must never be at­
tached to the back of the furnace.
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 " 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
Horizontal Furnace Installation
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 4. Do not install furnace on its back or in
the reverse airflow positions as safety control operation will be ad­
versely affected.
Installation Positions 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 V
4 " 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, fhe vent and combustion air pipes
attach to the furnace through the top panel for the upflow and hori-
zonfal installafions. For fhe downflow installafion, the vent and
combustion air pipes attach to the furnace fhrough fhe alternate
locations on the furnace side panels.
Nof e: 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"sec\\on for further details.
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 fo rigidly attach the furnace fo prevenf
movement. These straps should be attached to the furnace with
sheet metal screws and to the rafters orjoists with bolts. The pre­
ferred method is to use an angle iron frame bolted to the rafters or
Joists. (Take caution to allowdoor 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 " bottom clearance required for condensate trap.
Thirty (30) inches between the front of the furnace and adjacent
construction or other appliances MUST be maintained for service
clearance.
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 mef. See Figure 4.
This furnace MUST NOT be insfalled 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.
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