56
THESE INSTRUCTIONS ARE
INTENDED AS AN AID TO
QUALIFIED SERVICE
PERSONNEL FOR PROPER
INSTALLATION, ADJUSTMENT
AND OPERATION OF THIS UNIT.
READ THESE INSTRUCTIONS
THOROUGHLY BEFORE
ATTEMPTING INSTALLATION
OR OPERATION. FAILURE TO
FOLLOW THESE INSTRUCTIONS
MAY RESULT IN IMPROPER
INSTALLATION, ADJUSTMENT,
SERVICE OR MAINTENANCE,
POSSIBLY RESULTING IN FIRE,
ELECTRICAL SHOCK, CARBON
MONOXIDE POISONING,
EXPLOSION, PROPERTY
DAMAGE, PERSONAL INJURY
OR DEATH.
DISCONNECT MAIN ELECTRICAL
POWER TO THE UNIT BEFORE
ATTEMPTING ANY MAINTE-
NANCE. FAILURE TO DO SO CAN
CAUSE ELECTRICAL SHOCK
RESULTING IN PERSONAL
INJURY OR DEATH.
!
WARNING
FILTERS
NOTE:
These models do not come
from the factory with filters installed.
Filters must be field installed. See
Table 11.
Keep the filters clean at all times.
Vacuum dirt from filter, wash with
detergent and water, air dry
thoroughly and reinstall.
Keep the filters clean at all times.
Vacuum dirt from filter, wash with
detergent and water, air dry
thoroughly and reinstall.
NOTE:
Some filters must be resized
to fit certain units and applications.
See Table 11 and Figure 50.
1. 21” - 90,000 & 105,000 BTUH
units require removal of a
3.5-in. segment of filter and
frame to get the proper width
for a side filter.
2. 24.5” - 120,000 BTUH unit
requires removal of a 7" segment
of filter and frame to get the
proper width for a side filter.
TABLE 11
FILTER SIZES
UPFLOW FILTER SIZES
PART
FURNACE
INPUT
BOTTOM
SIDE
QUANTITY
NO.
WIDTH
MBTUH
SIZE
SIZE
54-24094-01
17
1
/
2
"
45, 60, 75A
15
3
/
4
" X 25"
15
3
/
4
" X 25"
1
54-24094-02
21"
75B, 90, 105
19
1
/
4
" X 25"
15
3
/
4
" X 25"
1
54-24094-03
24
1
/
2
"
120
22
3
/
4
" X 25"
15
3
/
4
" X 25"
1
DOWNFLOW FILTER SIZES
PART
FURNACE
INPUT
SIZE
QUANTITY
NO.
WIDTH
MBTUH
54-22699-01
17
1
/
2
"
45, 60, 75
12" X 20"
2
54-22699-01
21"
90, 105
12" X 20"
2
54-22699-02
24
1
/
2
"
120
14" X 20"
2
MAINTENANCE
