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To re-install 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.)
17 1/4"
DIVIDER
CLEANABLE
ALUMINUM
FILTER
BAROMETRIC
RELIEF
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.)
SCREWS
Fig. 4 — Screens Installed on Outdoor-Air Hood
(Sizes 7
/
to 8
1
2
OUTSIDE
AIR
HOOD
FILTER
FILTER
CLIP
/
Tons Shown)
1
2
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 tightening all screws.
SUPPLY FAN (BLOWER) SECTION
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal inju-
ry or death.
Before performing service or maintenance operations on
unit, LOCKOUT/TAGOUT the main power switch to unit.
Electrical shock and rotating equipment could cause severe
injury.
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 and 6.
Motor Plug Position
(95° from vertical)
ECM Motor
Fig. 5 — Direct-Drive Supply Fan Assembly
Gnd
GRN/YEL
L1
BLU
C
Com
BRN
1 2 3 4 5
Speed
Taps
Fig. 6 — ECM Motor Connectors
ECM MOTOR
The direct-drive motor is an X13 Electronically Commutated
Motor (ECM). An ECM motor contains electronic circuitry
used to convert single-phase line AC voltage into 3-phase DC
voltage to power the motor circuit. The motor circuit is a DC
4
WARNING
95°
ECM Power
Transformer
(460, 575v)
L2
YEL
Motor
Power
Connections
L G N
VIO
Default Connection
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Troubleshooting
