Carrier 48TJ016-028 Make Outdoor-Air Inlet Adjust- ments, Securing Screws, Panel, Seal

Step 10 --Make Outdoor-Air Inlet Adjust- ments

MANUAL OUTDOOR-AIR DAMPER -- All units (except

those equipped with a factory-inst_dled economizer) have a manual outdoor-air &tmper to provide ventilation ail:

Damper can be preset to admit up to 25% outdoor air into return-tdr compartment. To adjust, loosen secunng screws and move &tmper to desired setting, then retighten screws to secure dmnper (see Fig. 17).

25% ADJUSTABLE AIR DAMPER

/

		ol
\	/I	BASE
	/	UNIT

o g

÷I /

SECURING SCREWS

Fig. 17 --Standard 25% Outdoor-Air

Section Details

Step 11 --Install Outdoor-Air Hood

IMPORTANT: If the unit is equipped with the optional I

EconoMiSerIV. move the outdoor air temperature sensor I prior to installing the outdoor air hood. See the Optional EconoMiSerIV and EconoMiSer2 section for more details.

The outdoor- air hood is common to 25% air ventilation and

economizel: If EconoMiSerIV is used, all electrical connec-

tions have been made and adjusted at the factoly. Assemble and install hood in the field.

NOTE: The hood top panel, upper and lower filter retainel_, hood drain pan, baffle (size 024 and 028), and filter support bracket me secured opposite the condenser end of the unit. The screens, hood side panels, remaining section of tilter support bracket, seal strip, and hmdware are in a package located inside the return-air filter access panel (Fig. 18).

1.Attach seal strip to upper filter retainer. See Fig. 19.

2.Assemble hood top panel, side panels, upper filter retain- el: and dnun pan (see Fig. 20).

3.Secure lower filter rettuner and support bracket to unit.

See Fig. 20. Leave screws loose on size 024 and 028 units.

4.Slide bafile (size 024 and 028) behind lower filter retainer and tighten screws.

5.Ix_osen sheet metal screws for top panel of base unit

located above outdoor-air inlet opening, and remove screws for hood side panels located on the sides of the outdoor-air inlet opening.

6.Match notches in hood top panel to unit top panel screws. nsert hood flange between top panel fange and unit. Tighten screws.

7.Hold hood side panel flanges flat against unit, and install screws removed in Step 5.

8.Insert outdoor-air inlet screens and spacer in channel cre- ated by lower filter retainer and filter support bracket.

OUTDOOR-AIR HOOD AND

MOUNTING BRACKETS

F[_ER

PACKAGEAN[

HOOD

COMPONENTS

RETURN-AIRFILTE}

ACCESS PANEL

Fig. 18- Outdoor-Air Hood Component Location

PANEL

UPPER
RETAINER	PAN

SEAL;

Fig. 19- Seal Strip Location

BAFFLE

/

\

LOWER FILTER

RETAINER

HOOD SIDE

PANELS (2)

BAFFLE

. (024 TO 028 ONLY)

LOWER

FILTER

RETAINER

FILTER SUPPORT

BRACKET

HOOD DRAIN PAN

UPPER FILTER RETAINER

Fig. 20 --Outdoor-Air Hood Details

14