Installation Clearances; Return Air Upflow Units; Upflow Applications - Lennox G71MPP-36B-070 Installation Instructions Manual

NOTE - G71MPP-36B and -36C units with 1/2 hp blower
motors are equipped with three flexible legs and one rigid
leg, The rigid leg is equipped with a shipping bolt and a flat
white plastic washer (rather than the rubber mounting
grommet used with a flexible mounting leg), The bolt and
washer must be removed before the furnace is placed
into operation. After the bolt and washer have been re-
moved, the rigid leg will not touch the blower housing.
NOTE - G 71MPP-60D-135 units are equipped with a ship-
ping pad under the blower housing. Remove the shipping
pad prior to operation.
Allow for clearances to combustible materials as indicated
on the unit nameplate, Minimum clearances for closet or al-
cove installations are shown in figures 4, 9 and 13,
WARNING
WARNING
Upflow Applications
The G71MPP gas furnace can be installed as shipped in
the upfiow position, Refer to figure 4 for clearances,
Installation Clearances
Top
Left Side . _ Right Side
Bottom (Floor)
Top/Plenum 1 in. (25 ram)
*Front 0
Back 0
Sides 0-_
Vent 0
Floor 05
*Front clearance in alcove installation must be 24 in. (610 ram).
Maintain a minimum of 24 in. (610 ram) for front service access.
tAllow proper clearances to accommodate condensate trap and
vent pipe installation.
SFor installations on a combustible floor, do not install the fur-
nace directly on carpeting, tile or other combustible materials oth-
er than wood flooring.
FIGURE 4
Return Air -- Upflow Units
Return air can be brought in through the bottom or either
side of the furnace installed in an upfiow application. If the
furnace is installed on a platform with bottom return, make
an airtight seal between the bottom of the furnace and the
platform to ensure that the furnace operates properly and
safely. The furnace is equipped with a removable bottom
panel to facilitate installation,
Markings are provided on both sides of the furnace cabinet
for installations that require side return air. Cut the furnace
cabinet at the maximum dimensions shown on page 2,
NOTE - When air volumes over 1800 cfm (850 L/s) are
required with 60C or 60D models in an upflow applica-
tion, the following return air options are available:
1 - Return air from single side with transition which will
accommodate 20 x 25 x I in. (508x 635 x 25 ram) air filter.
(Required
to maintain proper air
velocity.) See figure
5.
Page 7