Bryant 548J - Manual (Page 4)

4
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 spring 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
spring 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 08D--09D 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 operations
on the fan system, shut off all unit power and tag--out
the unit disconnect switch. Do not reach into the fan
section with power still applied to unit.
! WARNING
Supply Fan (Direct--Drive)
For unit sizes 04, 05 and 06, the Standard Static supply
fan system consists of a direct--drive forward--curved
centrifugal blower wheel attached to the motor shaft. 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 (548J
Direct--Drive Fan Assembly) and Fig. 6 (EMC Motor
Connectors).
EMC Motor
Motor Plug Position
(95° from vertical)
95°
EMC Power
Transformer
(460, 575v)
C09260
Fig. 5 -- 548J Direct--Drive Supply Fan Assembly
L2
YEL
Gnd
GRN/YEL
L1
BLU
C
1 2 3 4 5
L G N
Motor
Power
Connections
Speed
Taps
Com
BRN
VIO
Default Connection
C09261
Fig. 6 -- EMC Motor Connectors
548J