Carrier 48TJD008-014 User Manual download pdf (Page 2)

SLAB MOUNT (Horizontal Units Only) — Provide a level

concrete slab that extends a minimum of 6 in. beyond unit

cabinet. Install a gravel apron in front of condenser coil air

inlet to prevent grass and foliage from obstructing airﬂow.

NOTE: Horizontal units may be installed on a roof curb if

required.

Step 2 — Field Fabricate Ductwork — Secure all

ducts to roof curb and building structure on vertical units.

Do not connect ductwork to unit. For horizontal applica-

tions, ﬁeld-supplied ﬂanges should be attached to horizontal

discharge openings and all ductwork secured to the ﬂanges.

Insulate and weatherproof all external ductwork, joints, and

roof openings with counter ﬂashing and mastic in accor-

dance with applicable codes.

Ducts passing through an unconditioned space must be

insulated and covered with a vapor barrier.

If a plenum return is used on a vertical unit, the return

should be ducted through the roof deck to comply with ap-

plicable ﬁre codes.

A minimum clearance is not required around ductwork.

Cabinet return-air static shall not exceed −.35 in. wg with

Durablade or PARABLADE economizer or .45 in. wg with-

out economizer.

These units are designed for a minimum continuous return-

air temperature of 50 F (dry bulb), or an intermittent opera-

tion down to 45 F (dry bulb), such as when used with a night

set-back thermostat.

Step 3 — Install External Trap for Condensate

Drain —

The unit’s

⁄

-in. condensate drain connections

are located at the bottom and side of the unit. Unit discharge

connections do not determine the use of drain connections;

either drain connection can be used with vertical or hori-

zontal applications.

When using the standard side drain connection, make sure

the plug in the alternate bottom connection is tight before

installing the unit.

To use the bottom drain connection for a roof curb in-

stallation, relocate the factory-installed plug from the

bottom connection to the side connection. See Fig. 4. The

piping for the condensate drain and external trap can be com-

pleted after the unit is in place.

All units must have an external trap for condensate drain-

age. Install a trap at least 4-in. deep and protect against freeze-

up. See Fig. 5. If drain line is installed downstream from the

external trap, pitch the line away from the unit at 1 in. per

10 ft of run. Do not use a pipe size smaller than the unit

connection.

Step 4 — Rig and Place Unit — Inspect unit for trans-

portation damage. File any claim with transportation agency.

Keep unit upright and do not drop. Spreader bars are not

required if top crating is left on unit. Rollers may be used to

move unit across a roof. Level by using unit frame as a ref-

erence. See Table 1 and Fig. 6 for additional information.

Operating weight is shown in Table 1 and Fig. 6.

Lifting holes are provided in base rails as shown in

Fig. 6 and 7. Refer to rigging instructions on unit.

All panels must be in place when rigging.

POSITIONING — Maintain clearance around and above unit

to provide minimum distance from combustible materials,

proper airﬂow, and service access. See Fig. 7.

Do not install unit in an indoor location. Do not locate

unit air inlets near exhaust vents or other sources of con-

taminated air.

Be sure that unit is installed so that snow will not block

the combustion intake or ﬂue outlet.

Unit may be installed directly on wood ﬂooring or on Class

A, B, or C roof-covering material when roof curb is used.

Although unit is weatherproof, guard against water from

higher level runoff and overhangs.

Position unit on roof curb so that the following clearances

are maintained:

⁄

-in. clearance between roof curb and base

rails on each side and front of unit; 1

⁄

-in. clearance be-

tween roof curb and rear of unit. (See Fig. 2, section C-C.)

Fig. 1 — Horizontal Conversion Panels

1 2 3 4 5 6 7 ... 39 40

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Carrier 48TJD008-014 User Manual Page 2

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