Carrier 48AJ Adding Seal Strip to Top of Hood Sides, a48-8498, Economizer Hood Assembly

Step 9 — 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. The hood assemblies must be field-assembled. The 48AW,AY units are side supply and side return. The return duct limits access to economizer filters from below.

The 48AJ,AK,AW,AY020-050 units have two hoods on ev- ery unit. The 48AJ,AK,AW,AY051 and 060 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 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) 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 1/8-in. past the end opposite the mounting flange. See Fig. 23.

2.Assemble hood sides, top, and cross member with gasketed screws provided. See Fig. 24.

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. 25.

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. 26.

6.Add gray foam strip (provided) to cross members on bot- tom tray. See Fig. 27.

7.Attach gray foam strip (provided) to block-off baffle on outer face of flange. See Fig. 28.

8.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.

9.Remove screws along bottom of damper assembly. Locate and mount block-off baffle using these screws.

10.Assemble 2 filter tracks side-by-side with the assembled ends together.

11.Attach one mounting angle to the assembled end of the filter track. See Fig. 29.

12.Attach 9 green speed clips (provided) to hood side panels. Engagement section of clip faces up and towards the out- side of the hood side panels.

13.Attach remaining mounting angle to other end of the filter track with no. 10 screws provided.

14.Place filter track assembly in bottom of hood by attaching to hood with speed clips and gasketed screws provided.

NOTE: Be sure the filters are installed with the airflow in the correct direction.

15.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 centered over the other large flange. See Fig. 30.

16.Slide two 20 x 25-in. filters into cross members of hood assembly. Attach filter cover over filters with screws and speed clips provided.

TOP

FLANGE

BLACK

SEALHOOD SIDE STRIP

Fig. 23 — Adding Seal Strip to Top of Hood Sides

a48-8498

Fig. 24 — Economizer Hood Assembly

(Right Side/Center Economizer Hood Shown)

MOUNTING

FLANGE

HOOD SIDE

Fig. 25 — Adding Seal Strip to Sides of Hood Top

Mounting Flange

32