Carrier 50HJ008-014, Installation, Start-Up And Service Instructions Manual, Page: 14 / 40

OPTIONAL PARABLADE ECONOMIZER — The op-
tional Parablade economizer hood assembly is packaged and
shipped in the filter section. Damper blades and control boards
are installed at the factory and the economizer is shipped in
the vertical discharge position.
NOTE: Horizontal discharge block-off plate is shipped with
the air hood package. The Parablade economizer can only
be used for vertical discharge applications. Discard this plate.
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 swing-
ing 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.
See Fig. 13. Save panels and screws. Remove optional
economizer so the outdoor-air damper hood package can
be removed from the filter section.
3. Assemble outdoor-air hood top and side plates as shown
in Fig. 14. Install seal strips on the hoop top and sides.
Put aside screen retainer and retainer screw for later as-
sembly. Do not attach hood to unit at this time.
4. On 012 and 014 units, install vertical discharge block-
off plate over duct openings. See Fig. 15.
5. Slide economizer into unit and secure with screws. See
Fig. 24.
NOTE: Be sure to engage rear economizer flange under
tabs in vertical return-air opening.
6. Insert economizer plug into economizer harness. Re-
move tape from barometric relief damper. See Fig. 24.
7. If ventilation air is not required, proceed to Step 8. If
ventilation air is required, perform the following:
a. Make sure the factory-installed jumper is in place across
terminals P and P1 on the economizer logic module.
T and T1 should be disconnected during adjustment.
b. The 2 potentiometers with slots for adjustment are
located on the face of the economizer logic module.
Turn the lower potentiometer fully clockwise. The
ECONOMIZER CONTROL BOARD
WIRING HARNESS ECONOMIZER MOTOR
Fig. 17 — Horizontal Durablade Economizer
Installation (90 Degree Rotation)
BLOCK-OFF PLATE
Fig. 18 — Horizontal Discharge Block-Off Plate
EXAMPLE:
Given — Negative Pressure . . . . . . . . . . . . . . . . . . 0.1 in. wg
Outdoor Air . . . . . . . . . . . . . . . . . . . . . . . . 1100 cfm
Determine — Setting = 6
Fig. 19 — Durablade Economizer Minimum
Position Setting
4
3
2
1
0
5
6
7
8
9
Fig. 20 — Durablade Economizer Minimum
Position Damper Setting
14