Page 11
Horizontal Applications
The G71MPP furnace can be installed in horizontal ap-
plications with either right− or left−hand air discharge.
The G71MPP may also be installed as a unit heater. Either
suspend the furnace as shown in figure 14, or install the
furnace on a field−fabricated raised platform. The unit
must be supported at both ends and beneath the blower
deck to prevent sagging.
Refer to figure 13 for clearances in horizontal applications.
Horizontal Application
Installation Clearances
Top
Left End Right End
Right−Hand Discharge
Left−Hand Discharge
Top
Bottom (Floor)**
Bottom (Floor)**
Left End Right End
Air
Flow
Air
Flow
Air
Flow
Air
Flow
Top 0
Front* 0
Back 0
Ends 0
Vent 0
Floor 0‡
*Front clearance in alcove installation must be 24 in. (610 mm).
Maintain a minimum of 24 in. (610 mm) for front service access.
**A 5−1/2 service clearance must be maintained below the unit to
provide for servicing of the condensate trap.
‡For installations on a combustible floor, do not install the furnace
directly on carpeting, tile or other combustible materials other
than wood flooring.
FIGURE 13
Suspended Installation of Horizontal Unit
NOTE − If unit is suspended, horizontal support kit (Catalog
No. 56J18, ordered separately), or equivalent, is recom-
mended to ensure proper unit support and coil drainage.
1 − Select location for unit keeping in mind service and
other necessary clearances. See figure 13.
2 − Provide service platform in front of unit.
3 − If unit is installed above finished space, fabricate a
drain pan fitted with a 1/2 inch or 3/4 inch N.P.T. fitting.
4 − Using 3/8 inch rods and support frame kit or field−fabri-
cated supports, fabricate suspension hangers, keep-
ing in mind front service access clearances.
5 − Mount unit on support frame as shown in figure 14.
6 − Continue with exhaust, condensate and intake line
piping instructions.
FIGURE 14
BLOWER ACCESS
PANEL
3/8 in. RODS
SUPPORT FRAME
DRAIN PAN
(to protect finished space)
INTAKE/EXHAUST
CONNECTION
TYPICAL HORIZONTAL APPLICATION
7 − If unit is suspended above finished space, hang the
field−provided drain pan below the support frame as
shown in figure 14. Leave 5−1/2 inches for service
clearance below unit for condensate trap.
8 − Route auxiliary drain line so that water draining from
this outlet will be easily noticed by the homeowner. If
necessary, run the condensate line into a condensate
pump to meet drain line slope requirements. The
pump must be rated for use with condensing furnaces.
Protect the condensate discharge line from the pump
to the outside to avoid freezing.
Platform Installation of Horizontal Unit
1 − Select location for unit keeping in mind service and
other necessary clearances. See figure 13.
2 − Construct a raised wooden frame and cover frame
with a plywood sheet. Provide a service platform in
front of unit. If unit is installed above finished space,
fabricate a drain pan to be installed under unit.
When installing the unit in a crawl space, a proper sup-
port platform may be created using cement blocks and
the horizontal support frame kit (ordered separately,
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