Adjustments; Economizer And Fixed Outdoor Air Damper - Carrier 50AJ/AK/AM020 Installation Instructions Manual

Step 7 — 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 pack-
ages are being added to the unit, install power exhaust or baro-
metric relief before installing economizer hoods.
Economizer Hood Assembly — The economizer hood is
shipped in a package secured to the outside of the unit, behind
the indoor access panel. The hood assemblies must be field-
assembled. The 50AW,AY units are side supply and side
return. The return duct limits access to economizer filters from
below. Filter tracks (mounting angle without tabs) must be
installed correctly to allow access to economizer filters from
each side.
The 50AJ,AK,AW,AY020-050 units have two hoods on ev-
ery unit. Each hood has two lower filter tracks, one slotted side
and one side without slots. Construct the assembly so that the
slotted side is adjacent to the other hood when mounted on the
unit.
The 50AJ,AK,AW,AY060 units have 3 hoods on every unit.
Each hood has two lower filter tracks, one slotted side and one
side without slots. Construct the two outer hood assemblies so
that the slotted sides are adjacent to the center hood when
mounted on the unit.
NOTE: Before assembly of the economizer hood, check along
the outer edges of the economizer assembly for any seal strip
protruding past the flanges. Trim the excess seal strip so that it
is flush with the economizer assembly flanges.
Perform the following procedure to assemble the economizer
hood.
1. Apply black seal strip (provided in package) to outside
top-edge of hood sides. Wrap seal strip over edge to cover
top flange (6 hood sides). Make sure seal strip covers
screw holes. Allow strip to overhang
opposite the mounting flange. See Fig. 26.
2. Assemble hood sides, top, and cross member with
gasketed screws provided. See Fig. 27.
3. Attach 15 green speed clips (provided) to hood top.
4. Apply black seal strip (provided) to mounting flanges of
hood sides being sure to cover mounting holes. See
Fig. 28.
NOTE: Each hood assembly has one hood side with slots and
one hood side without slots. On the 50AJ,AK,AW,AY020-050
units, the two outer hood assemblies must have the hood sides
with the slots located adjacent to each other when mounted on
the unit. On the 50AJ,AK,AW,AY060 units, the two outer
hood assemblies must have the hood sides with the slots
located adjacent to the center hood. The center hood assembly
should have hood side with slots located on the left side.
5. Apply black seal strip (provided) to back of hood top
mounting flange. Seal strip of hood top mounting flange
must press tightly against seal strip of hood side mount-
ing flanges. See Fig. 29.
6. Add gray foam strip (provided in package) to cross mem-
bers on bottom tray. See Fig. 30.
7. Place gray foam strip (provided) on inside of slotted hood
side between filter and cross member opposite the mount-
ing end. See Fig. 31.
8. Attach gray foam strip (provided) to block-off baffle on
outer face of flange. See Fig. 32.
9. Remove the screws on each end and along top of damper
assembly of unit. Remove top 4 screws on each side of
filter panel under damper assembly. Set hood assembly in
place and attach to unit using these screws.
10. Remove screws along bottom of damper assembly. Lo-
cate and mount blockoff baffle using these screws.
1
/ -in. past the end
8
42
TOP
FLANGE
BLACK
SEAL
STRIP
Fig. 26 — Adding Seal Strip to Top of Hood Sides
NOTE: Left side economizer hood has mounting angle without tabs
and filter rack assembled end on the opposite side.
Fig. 27 — Economizer Hood Assembly
(Right Side/Center Economizer Hood Shown)
MOUNTING
FLANGE
HOOD SIDE
Fig. 28 — Adding Seal Strip to Sides of Hood Top
Mounting Flange
HOOD SIDE