Bryant 548F - Manual (Page 14)

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Assembly
1. Determine if ventilation air is required in building. If
so, determine the minimum amount to be supplied by
each unit and record quantity of ventilation air
needed for use in Step 7.
2. Remove filter access panel by raising panel and
swinging panel outward. Panel is now disengaged
from track and can be removed. No tools are required
to remove filter access panel. Remove outdoor-air
opening panel. Save panels and screws. See Fig. 10.
Remove optional outdoor-air hood package from filter
section.
3. Assemble outdoor-air hood top and side plates as
shown in Fig. 11. Install seal strips on hoop top and
sides. Put aside screen retainer and retainer screw
for later assembly. Do not attach hood to unit at this
time.
4. Economizer comes factory-installed in unit and
secured with screws. See Fig. 12.
NOTE: Be sure rear economizer flange is engaged under tabs
in vertical return-air opening. See Fig. 24.
5. To convert to horizontal discharge application:
a. Rotate the economizer 90 degrees until the econo-
mizer motor faces the outdoor section (see Fig. 13).
b. Remove shipping screw and tape and then rotate
the barometric relief damper hinge 90 degrees.
Barometric relief damper should open vertically to
operate properly.
c. Install horizontal discharge block-off plate over the
opening on the access panel. (Block-off plate MUST
be installed before installing hood assembly.)
6. Remove existing 12-pin blue and yellow wire jumper
plug and store. Insert 12-pin economizer plug into
economizer harness. See Fig. 12.
7. If ventilation air is not required, proceed to Step 8. If
ventilation air is required, determine the minimum
position setting for required airflow. See Fig. 14.
Adjust minimum position setting by adjusting the
screws on the position setting bracket. Slide bracket
until the top screw is in the position determined by
Fig. 14. Tighten screws. See Fig. 15.
8. Remove tape from outdoor-air thermostat (OAT). Fas-
ten OAT to inside of hood using screws and speed
clips provided. See Fig. 16. Make sure OAT terminals
are positioned up.
9. Replace outdoor-air opening panel using screws from
Step 2. Replace filter access panel. Ensure the filter
access panel slides along the tracks and is securely
engaged.
10. Fasten hood top and side plate assembly (Fig. 11) to
outdoor-air opening panel with screws provided.
11. Place knob supplied with economizer on OAT. See
Fig. 16. Set for 3° F below indoor room thermostat
setting. If accessory enthalpy control (EC) is used in
place of OAT, see instructions shipped with EC for
installation and adjustment. See Fig. 16.
12. Connect OAT per Fig. 17.
13. Slide outdoor-air inlet screen into screen track on
hood side plate. While holding screen in place, fasten
screen retainer to hood using screws provided.
NOTE: Refer to Fig. 18 for economizer barometric relief
damper characteristics.
Fig. 10 — Typical Access Panel Locations
Fig. 11 — Outdoor-Air Hood Details
Fig. 12 — Durablade Economizer Installed in Unit
ECONOMIZER
CONTROL
BOARD
ECONOMIZER
PLUG ECONOMIZER
MOTOR TOP
SCREW
BAROMETRIC
RELIEF DAMPER
WIRING
HARNESS
POSITION SETTING
BRACKET
U-SHAPED
HOLE
(NOT
SHOWN)
SHIPPING
SCREW