User`s manual

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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. 20.
Remove optional outdoor-air damper hood package
from filter section.
3. Assemble outdoor-air hood top and side plates as
shown in Fig. 21. 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. On 120 and 150 units, install vertical discharge
block-off plate on right side over return air duct open-
ing. See Fig. 22.
Remove screw and discard from barometric relief
damper.
NOTE: Be sure to engage rear economizer flange under tabs
at rear of vertical return-air opening.
5. To convert to horizontal discharge application:
a. Rotate the economizer 90 degrees until the econo-
mizer motor faces the condenser section (see
Fig. 23).
b. 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 assem-
bly.) See Fig. 24.
6. Insert economizer plug into economizer harness.
Remove tape and screw from barometric relief
damper. See Fig. 25.
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. 26.
Adjust minimum position setting by loosening the
screws on the position setting bracket. See Fig. 27.
Slide bracket until the top screw is in the position
determined by Fig. 26. Tighten screws.
8. Remove tape from outdoor-air thermostat (OAT). Fas-
ten OAT to inside of hood using screws and speed
clips provided. See Fig. 28. 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.
Fig. 19 — Position Setting
Fig. 20 — Panel Locations
Fig. 21 — Outdoor-Air Hood Details