Payne PA1R Series Installation, Start-Up And Service Instructions Manual page 12

6. Remove and save 6 screws (3 on each side) from sides of
the manual outdoor-air damper assembly.
7. Align screw holes on hood with screw holes on side of
manual outdoor-air damper assembly. See Fig. 13 and
14. Secure hood with 6 screws from Step 6.
8. Adjust minimum position setting of the damper blade
by adjusting the manual outdoor-air adjustment screws
on the front of the damper blade. See Fig. 12. Slide blade
vertically until it is in the appropriate position deter-
mined by Fig. 15. Tighten screws.
9. Remove and save screws currently on sides of hood. In-
sert screen. Secure screen to hood using the screws. See
Fig. 14.
Fig. 14 — Outdoor-Air Damper
with Hood Attached
Fig. 15 — Position Setting
B. Durablade Economizer
NOTE: Horizontal discharge block-off plate is shipped with
the air hood package. If unit is to be used for vertical dis-
charge 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 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.
Save panels and screws. See Fig. 16. Remove optional
outdoor-air damper hood package from filter section.
Fig. 16 — Typical Access Panel Locations
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 retainer screw 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 de-
grees. Barometric relief damper should open verti-
cally 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 assembly.) See
Fig. 19.
5. Insert economizer plug into economizer harness. Re-
move tape from barometric relief damper. See Fig. 20.
6. If ventilation air is not required, proceed to Step 7. If
ventilation air is required, determine minimum posi-
tion setting for required airflow. See Fig. 21. Adjust mini-
mum 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.
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