Carrier 50TFQ008 Installation, Start-Up And Service Instructions Manual page 12

d. 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. 18.
7. Remove 12-pin blue and yellow jumper wire plug from
the factory harness located in the top left return-air sec-
tion and save. Insert economizer plug into economizer
harness. Remove tape and screw from barometric relief
damper. See Fig. 16.
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. 19. Adjust minimum
position setting by adjusting the screws on the position
setting bracket. See Fig. 20. Slide bracket until the top
screw is in the position determined by Fig. 19. Tighten
screws.
9. Remove tape from outdoor-air thermostat (OAT). Fasten
OAT to inside of hood using screws and speed clips pro-
vided. See Fig. 21. Make sure OAT terminals are posi-
tioned up.
10. 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.
11. Fasten hood top and side plate assembly to outdoor-air
opening panel with screws provided.
12. Place knob supplied with economizer on OAT. See
Fig. 21. Set for 2° C (3° F) below indoor room thermostat
setting. If accessory enthalpy control (EC) is used in
place of OAT, see instructions shipped with EC for instal-
lation and adjustment. See Fig. 21.
13. Connect OAT per Fig. 22.
14. 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. 23 for economizer barometric relief
damper characteristics.
Fig. 14 — Outdoor-Air Hood Details
Fig. 15 — Vertical Discharge Block-Off Plate
(Size 012 Only)
Fig. 16 — Durablade Economizer Installation
Fig. 17 — Horizontal Discharge Durablade
Economizer Installation
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SHIPPING
SCREW
SHIPPING
SCREW