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7. Connect the motor plug to the plug provided with the har-
ness. Be sure the wires will not interfere with any moving
parts. Secure the wires with wire ties if needed. (See
Fig. 5.)
8. Pass the harness wires through the plastic bushing in the
compressor section partition, and into the control box sec-
tion. Be sure to secure the wires so that they will not inter-
fere with any moving parts.
9. Install the insulated partition (block-off panel) by sliding
the panel into the unit from the side. The damper side of
the panel will slide along the top of the flange of the
damper assembly, between the return and outdoor air
damper blades. The panel should then be rotated upwards
so that the mounting holes align with the holes in the pan-
els at the end of the unit. Once in the correct position, the
partition will be horizontal inside the unit as shown in
Fig. 6.
Fig. 5 — Economizer Plug and Wiring
INSULATED
BLOCK-OFF
PANEL
Fig. 6 — Economizer Block-Off Panel Location
MOUNTING
HOLES
3
10. Secure the partition to the frame using the screws saved
from Step 3, at the edges of the partition as shown in
Fig. 7.
11. The installation of the damper assembly is now complete
and the outer unit panels can now be replaced using the
screws saved from the earlier steps. Be sure to inspect all
panel seals prior to re-assembly and replace any seals that
appear damaged.
IMPORTANT: If the return duct opening was covered
prior to installation, remember to remove the covering so
as not to block off the return air to the unit.
12. The control wiring can now be completed.
13. Open the hinged control box compartment on the unit and
remove the control box cover. Save the screws for use lat-
er. Be sure not to place sharp objects on any surface that
could be damaged.
14. Install the Economizer board (P/N 50TG000596) into the
control box using the no. 6
economizer board will mount into the pre-drilled holes on
the right side flange of the control box as shown in Fig. 8.
15. Connect the communications and power harness
(P/N 50TG400612) into the Economizer Control Board
(ECB) plugs J1 and J2 and to the Main Base Board plugs
J2 and J3. See Fig. 9 and 10. Be sure to connect the plugs
with the proper orientation such that the locking tabs cap-
ture the plug.
MOUNTING
HOLES
Fig. 7 — Secure Block-Off Panel to Frame
3
/
-in. screws provided. The
4
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