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
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 Figures 54 and 55.
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” - 105,000 BTUH unit
requires removal of a 7" segment
of filter and frame to get the
proper width for a side filter.
DO NOT OPERATE THE SYSTEM
FOR EXTENDED PERIODS
WITHOUT FILTERS.
A PORTION OF THE DUST
TABLE 9
FILTER SIZES
UPFLOW FILTER SIZES
FURNACE INPUT BOTTOM SIDE
QUANTITY
WIDTH MBTUH SIZE SIZE
17
1
⁄2" 45, 60, 75 15
3
⁄4" X 25" 15
3
⁄4" X 25" 1
21" 90, 105 19
1
⁄4" X 25" 15
3
⁄4" X 25" 1
DOWNFLOW FILTER SIZES
FURNACE INPUT
SIZE QUANTITY
WIDTH MBTUH
17
1
⁄2" 45, 60, 75 12" X 20" 2
21" 90 12" X 20" 2
24
1
⁄2" 105 14" X 20" 2
MAINTENANCE
FIGURE 54
BOTTOM PANEL REMOVAL
JACKET ASSEMBLY
SOLID BOTTOM
NOTE:
BACK FLANGE OF SOLID BOTTOM FITS
UNDERNEATH JACKET. SIDES AND FRONT
FLANGES FIT OVER FLANGES ON JACKET.
SCREW
(2) REQ’D.
JACKET ASSEMBLY
FILTER
FILTER
ROD
SOLID BOTTOM REMOVAL
FILTER & ROD LOCATION
!
CAUTION
51
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