Step 10 - Make Outdoor-Air Inlet Adjustments; Economizer And Fixed Outdoor Air Damper - Carrier WeatherMaker 48A020 Installation Instructions Manual

Step 10 — Make Outdoor-Air Inlet Adjustments

ECONOMIZER AND FIXED OUTDOOR AIR DAMPER

Hoods are used on all units with economizer or adjustable self-
closing fixed outdoor air damper.
NOTE: If accessory power exhaust or barometric relief packages
are being added to the unit, install power exhaust or barometric
relief before installing economizer hoods.
Economizer Hood Assembly
The economizer hood is shipped in a package secured to the out-
side of the unit. The hood assemblies must be field assembled.
The 48A4,A5,A8,A9 units are side supply and side return. The
return duct limits access to economizer filters from below.
The 48A020-050 units have two hoods on every unit. The 48A060
units have 3 hoods on every unit.
NOTE: Before assembly of the economizer hood, check along the
outer edges of the economizer assembly for any seal strip protrud-
ing past the flanges. Trim the excess seal strip so that it is flush
with the economizer assembly flanges.
Perform the following procedure to assemble economizer hood.
1. Apply black seal strip (provided) to outside top-edge of hood
sides. Wrap seal strip over edge to cover top flange (2 hood
sides per hood assembly). Make sure seal strip covers screw
holes. See Fig. 27.
2. Add gray foam strip (provided) to cross members on bottom
tray. See Fig. 28.
3. Assemble hood sides, top, and cross member with gasketed
screws provided. See Fig. 29.
4. Attach speed clips (provided) to hood top. Engagement sec-
tion of the clip faces inside hood. See Fig. 30.
5. Apply black seal strip (provided) to mounting flanges of hood
sides being sure to cover mounting holes. See Fig. 31.
6. Apply black seal strip (provided) to back of hood top mount-
ing flange. Seal strip of hood top mounting flange must press
tightly against seal strip of hood side mounting flanges. See
Fig. 31.
7. Attach gray foam strip (provided) to block-off baffle on outer
face of flange. See Fig. 32.
8. Remove the screws on each end and along top of the outdoor
air opening of unit. Set hood assembly in place and attach to
unit using gasketed screws. See Fig. 33.
9. Locate and mount block-off baffle using 3 screws. See
Fig. 34.
10. Assemble bottom filter tracks side by side with the mounting
angle together. The filter track assemblies must be installed
with the flange and mounting angle pointing down. See
Fig. 35-37.
11. Attach speed clips (provided) to hood side panels. Engage-
ment section of clip faces up and towards the outside of the
hood side panels. Attach mounting angles to hood with gas-
keted screws provided. See Fig. 38.
NOTE: Be sure the filters are installed with the airflow in
the correct direction.
12. Attach filter track under the hood assembly. See Fig. 39.
13. Attach black seal strip (provided) to filter cover. Seal strip
should be applied centered over the holes of the one flange,
making sure to fully cover holes and center over the other
large flange. See Fig. 40.
14. Slide two 20 x 25-in. filters into cross members of hood
assembly. Attach filter cover over filters with screws and
speed clips provided. See Fig. 41.
TOP
FLANGE
BLACK
SEAL
STRIP
Fig. 27 — Adding Seal Strip to Top of Hood Sides
GRAY FOAM STRIP
CROSS MEMBER
Fig. 28 — Adding Foam Strip to Cross Member
HOOD
SIDE
HOOD
TOP
CROSS
MEMBER
Fig. 29 — Economizer Hood Assembly
Fig. 30 — Top Hood with Speed Clips
28
HOOD SIDE
HOOD
SIDE