33
FIGURE 25
FILTER RETAINING ROD
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
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.
TABLE 9 FILTER SIZES
MAINTENANCE
WARNING
!
*NOTE: Some filters must be
ordered or resized to fit certain
units and applications.
UPFLOW FILTER SIZES AS SHIPPED
FURNACE INPUT BOTTOM SIDE
QUANTITY
WIDTH BTUH SIZE SIZE
14 50 12
1
/4" X 25" 15
3
/4" X 25" 1
17
1
/2" 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
24
1
/
2" 125 & 150 22
3
/
4" X 25" 15
3
/
4" X 25" 1
FILTER
ROD
45-24095-01
If high efficiency filters or electronic air
cleaners are used in the system, it is
important that the airflow is not
reduced to maximize system
performance and life. Always verify that
the systems airflow is not impaired by
the filtering system that has been
installed, by performing a temperature
rise and temperature drop test.
Keep the air filters clean at all times.
Vacuum dirt from filter, wash with
detergent and water, air dry thoroughly
and reinstall.
See Table 9 and Figures 26 and 27 for
proper filter sizes and locations.
1. 14”- 50,000 BTUH unit requires
removal of 3
1
/2” segment of filter and
frame to get proper width for a
bottom filter.
2. 21”-100,000 BTUH unit requires
removal of 3
1
/
2” segment of filter and
frame to get proper width for a side
filter.
3. 24
1
/
2”-125,000 and 150,000 BTUH
units require removal of 7” segment
of filter and frame to get proper
width for a side filter.
NOTE: (-)GPP models are not
factory equipped with filters or filter
rods. Filters must be field installed.
IMPORTANT: Do not operate the
system for extended periods without
filters. A portion of the dust entrained
in the air may temporarily lodge in the
air duct runs and at the supply
registers. Any circulated dust particles
will be heated and charred by contact
with the furnace heat exchanger. This
sooty residue will soil ceilings, walls,
drapes, carpets, and other household
articles. Soot damage may also result
with, or without, filters in place, when
certain types of candles are burned, or
candlewicks are left untrimmed.
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