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12
OPTIONAL DURABLADE ECONOMIZER — The op-
tional economizer hood assembly is packaged and shipped in
the filter section. Damper blades and control boards are in-
stalled at the factory and the economizer is shipped in the verti-
cal discharge 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 minimum amount to be supplied by each unit
and record quantity of ventilation air needed for use in
Step 6.
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. 16. Remove optional
outdoor-air damper hood package from filter section.
3. Assemble outdoor-air hood top and side plates as shown
in Fig. 17. Install seal strips on hood top and sides. Put
aside screen retainer and screws for later assembly. Do
not attach hood to unit at this time.
4. To convert to horizontal discharge application:
a. Rotate economizer 90 degrees until the
economizer motor faces the condenser section
(see Fig. 18).
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. 19.
5. Insert economizer plug into economizer harness. Remove
tape from barometric relief damper. See Fig. 20.
6. If ventilation air is not required, proceed to Step 7. If ven-
tilation air is required, determine minimum position set-
ting for required airflow. See Fig. 21. 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. 21. Tighten screws.
7. Remove tape from outdoor-air thermostat (OAT). Fasten
OAT to inside of hood using screws and speed clips pro-
vided. See Fig. 22. Make sure OAT terminals are posi-
tioned up.
8. Replace outdoor-air opening panel using screws from
Step 2. Replace filter access panel. Ensure the filter ac-
cess panel slides along the tracks and is securely engaged.
9. Fasten hood top and side plate assembly (Fig. 17) to
outdoor-air opening panel with screws provided.
10. Place knob supplied with economizer on OAT. See
Fig. 22. Set for 3° F below indoor room thermostat set-
ting. If accessory enthalpy control (EC) is used in place of
OAT, see instructions shipped with EC for installation
and adjustment. See Fig. 22.
11. Connect OAT per Fig. 23.
12. Slide outdoor-air inlet screen into screen track on hood
side plate. While holding screen in place, fasten screen re-
tainer to hood using screws provided.
NOTE: Refer to Fig. 24 for economizer barometric relief
damper characteristics.
ECONOMIZER
CONTROL
BOARD
BAROMETRIC
RELIEF
DAMPER
ECONOMIZER
PLUG
ECONOMIZER
MOTOR
SHIPPING
SCREW
Fig. 16 — Typical Access Panel Locations
Fig. 17 — Outdoor-Air Hood Details
Fig. 18 — Horizontal Durablade Economizer
Installation