33
FIGURE 25
BOTTOM RETURN
DISCONNECT MAIN ELECTRICAL
POWER TO THE UNIT BEFORE
ATTEMPTING ANY MAINTENANCE.
FAILURE TO DO SO CAN CAUSE
ELECTRICAL SHOCK RESULTING
IN SEVERE PERSONAL INJURY OR
DEATH.
FILTERS
NOTE: 80PJ and 80LJ models are not
factory equipped with filters. Filters
must be field installed.
Filter application and placement are
critical to airflow, which may affect the
heating and cooling system
performance. Reduced airflow can
shorten the life of the systems major
components, such as motor, limits,
elements, heat exchanger, evaporator
coil or compressor. Consequently, we
recommend that the return air duct
system have only one filter location.
The most common location will be
inside the furnace or air handler or a
filter base. For systems with a return
air filter grill or multiple filter grills, can
have a filter installed at each of the
return air openings. DO NOT DOUBLE
FILTER THE RETURN AIR DUCT
SYSTEM. DO NOT FILTER THE
SUPPLY AIR DUCT SYSTEM.
If high efficiency filters or electronic air
cleaners are used in the system, it is
TABLE 8 FILTER SIZES
MAINTENANCE
WARNING
!
FIGURE 24
RESIZING FILTERS & FRAME
*NOTE: Some filters must be
resized to fit certain units and
applications.
SOLID BOTTOM MAY BE ORDERED AS AN OPTION FROM THE FACTORY.
UPFLOW FILTER SIZES
FURNACE INPUT BOTTOM SIDE
QUANTITY
WIDTH BTUH SIZE SIZE
14 45 & 50 12
1
/
4" X 25" 15
3
/
4" X 25" 1
171/2" 67, 75 & 100 15
3
/4" X 25" 15
3
/4" X 25" 1
21" 100 19
1
/
4" X 25" 15
3
/
4" X 25" 1
241/2" 125 & 150 22
3
/4" X 25" 15
3
/4" X 25" 1
DOWNFLOW FILTER SIZES
FURNACE INPUT
SIZE QUANTITY
WIDTH BTUH
14" 45 & 50 14" X 20" 1
17
1
/
2" 67, 75 & 100 12" X 20" 2
21" 100 12" X 20" 2
24
1
/
2" 125 & 150 14" X 20" 2
FILTER
ROD
45-24095-01
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