4
Each of these filters and screens will need to be
periodically replaced or cleaned.
RETURN AIR FILTERS
EQUIPMENT DAMAGE HAZARD
Failure to follow this CAUTION can result in
premature wear and damage to equipment.
DO NOT OPERATE THE UNIT WITHOUT THE
RETURN AIR FILTERS IN PLACE.
Dirt and debris can collect on heat exchangers and
coils possibly resulting in a small fire. Dirt buildup on
components can cause excessive current used resulting
in motor failure.
CAUTION
Return air filters are disposable fiberglass media type.
Access t o the filters is through the small lift--out panel
loca ted on the rear side of the unit, above the
evaporator/return air access panel. (See Fig. 1.)
To remove the filters:
1. Grasp the bottom flange of t he upper panel.
2. Lift up and swing the bottom out until the panel dis-
engage s and pulls out .
3. Reach inside and extract the filters from the filter
rack.
4. Replace these filters as required with similar replace-
ment filters of same size.
To re--install the access panel:
1. Slide the top of the panel up under the uni t top panel .
2. Slide the bottom into the side channels.
3. Push the bottom flange down until it contacts the top
of the lower panel (or economizer top).
Outside Air Hood
Outside air hood inle t screens are permanent
aluminum--mesh type filters. Check these for cleanliness.
Remove the screens when cleaning is required. Clean by
washing with hot low--pressure water and soft detergent
and replace all screens before restarting the unit. Observe
the flow direction arrows on the side of each filter frame.
Economizer Inlet Air Screen
This air screen is retained by filter clips under the top
edge of the hood. (See Fig. 3.)
17 1/4”
DIVIDER
BAROMETRIC
RELIEF
CLEANABLE
ALUMINUM
FILTER
FILTER
HOOD
FILTE
CLIP
OUTSIDE
AIR
C06027
Fig. 3 -- Filter Installation
To remove the filter, open the filter clips. Re--install the
filter by placing the frame in its track, then closing the
filter clips.
Manual Outside Air Hood Screen
This inlet screen is secured by a retainer angle across the
top edge of the hood. (See Fig. 4.)
C07156
Fig. 4 -- Screens Installed on Outdoor --Air Hood
(Sizes 7 -- 1/2 to 8 --1/2 Tons Shown)
To remove the screen, loosen the screws in the top retainer
and slip the retainer up until the filter can be removed.
Re--install by placing the frame in its track, rotating the
retainer back down and tighten all screws.
SUPPLY FAN (BLOWER) SECTION
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could cause personal
injury or death.
Before performing service or maintenance ope rations
on unit, LOCK--OUT/TAGOUT the main power
switch to unit. Electrical shock and rotating
equipment could cause seve re injury.
!
WARNING
48HC
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