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Assembly:
1. Determine quantity of ventilation required for building.
Record amount for use in Step 8.
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 the filter
access panel. Remove outdoor-air opening panel. Save
panels and screws. See Fig. 14.
3. Separate hood and screen from basepan by removing the
screws and brackets securing them. Save all screws and
discard brackets.
4. Replace outdoor air opening panel.
5. Place hood on front of outdoor air opening panel. See
Fig. 15 for hood details. Secure top of hood with the
6 screws removed in Step 3. See Fig. 16.
6. Remove and save 8 screws (4 on each side) from sides of
the manual outdoor-air damper.
7. Align screw holes on hood with screw holes on side of
manual outdoor-air damper. See Fig. 15 and 16. Secure
hood with 8 screws from Step 6.
8. Adjust minimum position setting of the damper blade by
adjusting the manual outdoor-air adjustment screws on
the front of the damper blade. See Fig. 14. Slide blade
vertically until it is in the appropriate position determined
by Fig. 17. Tighten screws.
9. Remove and save screws currently on sides of hood. In-
sert screen. Secure screen to hood using the screws. See
Fig. 16.
10. Replace filter access panel. Ensure filter access panel
slides along the tracks and is securely engaged.
OPTIONAL DURABLADE ECONOMIZER — The option-
al economizer hood assembly is packaged and shipped in the
filter section. Damper blades and control boards are installed at
the factory and the economizer is shipped in the vertical dis-
charge position.
NOTE: Horizontal discharge block-off plate is shipped with
the air hood package. If unit is to be used for vertical discharge
application, discard this plate.
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 8.
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. 18. Remove optional econo-
mizer to allow outdoor-air damper hood package to be
removed from filter section.
3. Assemble outdoor-air hood top and side plates as shown
in Fig. 19. Install seal strips on hood top and sides. Put
aside screen retainer and retainer screw for later assem-
bly. Do not attach hood to unit at this time.
4. On 012 and 014 units, install vertical discharge block-off
plate over duct openings. See Fig. 20.
5. Slide economizer into unit and secure with screws. See
Fig. 21.
NOTE: Be sure to engage rear economizer flange under tabs in
vertical return-air opening.
6. To convert to horizontal discharge application:
a. Rotate the economizer 90 degrees until the
economizer motor faces the condenser section
(see Fig. 22).
FILTER
ACCESS
PANEL
OUTDOOR AIR
OPENING
PANEL
SCREWS
(SIDE)
MANUAL
OUTDOOR-AIR
ADJUSTMENT
SCREWS
Fig. 14 — Damper Panel with Manual
Outdoor-Air Damper Installed
Fig. 15 — Outdoor-Air Hood Details
b. Remove retaining screw and tape from barometric
damper and discard. Rotate the barometric relief
damper hinge 90 degrees. Barometric relief
damper must 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 assem-
bly.) See Fig. 23.
7. Remove existing 12-pin, blue and yellow wire jumper
plug from factory wiring harness and save jumper. Insert
economizer plug into 12-pin economizer harness. See
Fig. 21.
8. If ventilation air is not required, proceed to Step 9. If ven-
tilation air is required, determine the minimum position
setting for required airflow. See Fig. 24. Adjust minimum
position setting by adjusting the screws on the position
setting bracket. See Fig. 25. Slide bracket until the top
screw is in the position determined by Fig. 24. Tighten
screws.
12
DAMPER
BLADE
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