35
FIGURE 26
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 10 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
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
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.
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 10 and Figures 27 and 28 for
proper filter sizes and locations.
1. 21”-100,000 BTUH unit requires
removal of 3
1
/
2
” segment of filter and
frame to get proper width for a side
filter.
2. 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.
