4
Economizer Inlet Air Screen
This air screen is retained by filter clips under the top edge of
the hood. See Fig. 3.
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.
Fig. 4 — Screens Installed on Outdoor-Air Hood
Remove the screen by loosening the three screws in the top re-
tainer 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
Supply Fan (Direct-Drive)
For unit sizes 04, 05 and 06, a direct-drive forward-curved cen-
trifugal 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 (50KCQ Direct-Drive
Fan Assembly) and Fig. 6 (ECM Motor Connectors).
Fig. 5 — 50KCQ Direct-Drive Supply Fan Assembly
Fig. 6 — ECM Motor Connectors
DIVIDER
BAROMETRIC
RELIEF
CLEANABLE
ALUMINUM
FILTER
FILTER
HOOD
FILTER
CLIP
OUTSIDE
AIR
CAUTION
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could cause personal injury
or death.
Before performing service or maintenance operations on
the fan system, shut off all unit power and lockout/tag-out
the unit disconnect switch. DO NOT reach into the fan sec-
tion with power still applied to unit.
ECM Motor
Motor Plug Position
(95° from vertical)
95°
ECM Power
Transformer
(460, 575v)
L2
YEL
Gnd
GRN/YEL
L1
BLU
C
12345
LGN
Motor
Power
Connections
Speed
Taps
Com
BRN
VIO
Default Connection
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