Filters - Lennox MERIT Series Installation Instructions Manual

FURNACE
PROPERLY
SIZED FLOOR
OPENING
Figure 15
2 - After opening is cut, set the combustible flooring
base into opening.
3 - Check fiberglass strips on the combustible flooring
base to make sure they are properly glued and
positioned.
4 - Lower supply air plenum into the combustible flooring
base until plenum flanges seal against fiberglass
strips.
NOTE - Be careful not to damage fiberglass strips.
Check for a tight seal.
5 - Set the furnace over the plenum.
6 - Ensure that the seal between the furnace and plenum
is adequate.
Installation on Cooling Coil Cabinet Figure 16
NOTE - Downflow combustible flooring kit is not
used.
1 - Refer to reverse-flow coil installation instructions for
correctly sized opening in floor and installation of
cabinet.
2 - When cooling cabinet is in place, set and secure
the furnace according to the instructions that are
provided with the cooling coil. Secure the furnace to
the cabinet.
3 - Seal the cabinet and check for air leaks.
Return Air Opening -- Downflow Units
Return air may be brought in only through the top opening
of a furnace installed in the downflow position. The follow-
ing steps should be taken when installing plenum:
1 - Bottom edge of plenum should be flanged with a
hemmed edge (See Figure 17 or Figure 18).
2 - Sealing strips should be used to ensure an airtight
seal between the cabinet and the plenum.
3 - In all cases, plenum should be secured to top of
furnace using sheet metal screws.
4 - Make certain that an adequate seal is made.
SUPPLY AIR
PLENUM
COMBUSTIBLE
FLOORING BASE
Page 11
PROPERLY
SIZED FLOOR
OPENING
Figure 16
PLENUM
(Field Provided)
SEALING STRIP
(Field Provided)
Side View
Figure 17
PLENUM
(Field Provided)
SECURE FROM
INSIDE CABINET Side View
Figure 18

Filters

This unit is not equipped with a filter or rack. A field-provid-
ed filter is required for the unit to operate properly. TABLE
3 lists recommended minimum filter size.
A filter must be in place whenever the unit is operating.
TABLE 3
Furnace Cabinet Width
17-1/2"
21"
FURNACE
COOLING COIL
PLENUM
SECURE FROM
OUTSIDE CABINET
CABINET
SIDE PANEL
SEALING STRIP
(Field Provided)
CABINET
SIDE PANEL
Minimum Filter Size
16 x 25 x 1 (1)