Carrier 48LJD - Manual (Page 12)

d. Install horizontal discharge block-off plate over
opening on the access panel. Block-off plate
MUST be installed before installing hood assembly
(see Fig. 21).
NOTE: Install spacers at the same time as the hori­
zontal block-off plate using same screws. The spac­
ers are used to cover gaps between the economizer
assembly and the unit.
ECONOMIZER
WIRE
HARNESS
PLUGS
BAROMETRI!
RELIEF
DAMPER^
Fig. 19 — Economizer Installed in Unit
BAROMETRIC
RELIEF DAMPER
BLOCK-OFF PLATE
Fig. 21 — Horizontal Discharge Block-Off Plate
7. Insert economizer plug from the wiring harness (sup­
plied with the unit) into the wiring harness plug (sup­
plied with the economizer). See Fig. 19.
8. Determine economizer damper position setting (see
Fig. 22). Adjust damper setting by adjusting screws on
the position setting bracket (see Fig. 23). Slide posi­
tion setting bracket until top screw (see Fig. 23) is in
the position determined by Fig. 22. Tighten screws.
9. Install evaporator coil access panel with screws saved
from Step 2.
10. Fasten hood top and side plate assembly to unit with
screws saved from the block-off panel removal (see
Fig. 18).
11. Remove tape from outdoor-air thermostat (OAT). Fas­
ten OAT to inside of hood using screws and speed clips
provided (see Fig. 24). Make sure OAT terminals are
up.
12. Place knob, supplied with economizer, on OAT. Set it
for 3 F below indoor room thermostat setting. If ac­
cessory solid-state enthalpy control (EC) is used in­
stead of the OAT, see instructions shipped with EC for
installation and adjustment (see Fig. 24).
13. Connect OAT per Fig. 25.
14. Slide outdoor-air inlet screens into screen track on hood
side plates. While holding screens in place, fasten screen
retainer to hood using screws provided.
15. Turn on base unit power.
Fig. 20 — Horizontal Economizer Installation
(90 Degree Rotation)
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