4
Removing the Return Air Filters:
1. Grasp the bottom flange of the upper panel.
2. Lift up and swing the bottom out until the panel
disengages and pulls out.
3. Reach inside and remove filters from the filter rack.
4. Replace filters as required with similar replacement
filters of same size.
Re−installing the Access Panel:
1. Slide the top of the panel up under the unit 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 inlet 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.
DIVIDER
BAROMETRIC
RELIEF
CLEANABLE
ALUMINUM
FILTER
FILTER
HOOD
FILTER
CLIP
OUTSIDE
AIR
C08634
Fig. 3 − Filter Installation
To remove the filter, open the spring clips. Re−install the
filter by placing the frame in its track, then closing the
filter clips.
Manual Outside Air Hood Screen
The Manual Outside Air Hood Screen is secured by three
screws and a retainer angle across the top edge of the
hood. See Fig. 4.
C07156
Fig. 4 − Screens Installed on Outdoor−Air Hood
(Sizes A07, D08−09s Shown)
Remove the screen by loosening the three screws in the
top retainer and move the retainer up until the filter can be
removed.
Re−install the Manual Outside Air Hood Screen by
placing the screen frame in its track, rotating the retainer
back down. Tighten all screws.
SUPPLY FAN (BLOWER) SECTION
ELECTRICAL SHOCK HAZARD
Failure to follow this warning can cause personal
injury or death.
Before performing service or maintenance operations
on the fan system, disconnect all electrical power to
the unit and apply approved Lock−out/Tagout
procedures to the unit disconnect switch. Do not
reach into the fan section with power applied to unit.
!
WARNING
Supply Fan (Direct−Drive)
For unit sizes 04, 05 and 06, a direct−drive
forward−curved centrifugal blower wheel is an available
option. The motor has taps to provide the servicer with the
selection of one of five motor torque/speed ranges to best
match wheel performance with attached duct system. See
Fig. 5 (50TCQ Direct−Drive Fan Assembly) and Fig. 6
(ECM Motor Connectors).
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