Carrier 48TJD Specifications download pdf (Page 2)

INSTALLATION

Inspect unit for transportation dmnage. If &_mage is found,

file claim with transportation agency.

Step 1 -- Provide Unit Support

ROOF CURB -- Assemble and install accessory roof curb or

horizont_d a&tpter roof curb in accordance with instructions

shipped with this accessory. See Fig. 1 and 2. Install insulation,

cant strips, roofing, and counter flashing as shown. Ductwork

can be installed to roof curb or horizontal adapter roof curb be-

fore unit is set in place. Curb or a&tpter roof curb should be

level. This is necessary to permit unit drain to function proper-

ly. Unit leveling tolerance is + l/l(_ in. per linear fl in any direc-

tion. Refer to Accessory Roof Curb or Horizontal A&_pter

Roof Curb Installation Instructions for additional information

as required. When accessory roof curb or horizontal adapter

roof curb is used, unit may be installed on class A, B, or C roof

covering material.

IMPORTANT: The gasketing of the unit to the roof curb

or adapter roof curb is critical for a watertight se_d.

Inst_fll gasket with the roof curb or adapter as shown in

Fig. 2. Improperly applied gasket can _dso result in air

leaks and poor unit performance.

ALTERNATE UNIT SUPPORT -- When the curb or adapter

cannot be used, install unit on a noncombustible surface. Sup-

port unit with sleepers, using unit curb support area. If sleepers

cannot be used, support long sides of unit with a minimum of 3

equally spaced 4-in. x 4-in. pads on each side.

Step 2 -- Rig and Place Unit -- Do not diop unit;

keep upright. Use spreader bras over unit to prevent sling or

cable &image. Rollers may be used to move unit across a roof.

Level by using unit frame as a refelence; leveling tolerance is

_+1/1_in. per linear fl in any direction. See Fig. 3 for additiomfl

information. Unit operating weight is shown in Table 1.

Four lifting holes are provided in ends of unit base rails as

shown in Fig. 3. Refer to rigging instructions on unit.

POSITIONING- Maintain clearance, per Fig. 4 and 5,

around and above unit to provide minimum distance from

combustible materials, proper airflow, and service access.

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

air inlets near exhaust vents or other sources of contmninated

all: For proper unit operation, adequate combustion and venti-

lation air must be provided in accordance with Section 5.3 (Air

for Combustion and Ventilation) of the National Fuel Gas

Code, ANSI Z223.1 (American National Stan&_rds Institute).

Although unit is weatherproof, guard against water from

higher level runoff and overhangs.

Ix)cate mechanical diaft system flue assembly at least 4 ft

from any opening through which combustion products could

enter the building, and at least 4 ft from any adjacent building.

When unit is located adjacent to public walkways, flue assem-

bly must be at least 7 ft above grade.

ROOF MOUNT-- Check building codes for weight distri-

bution requirements. Unit operating weight is shown in

Table 1.

hlstructions continued on page 9.

14-3/4_

NOTE: CRRFCURB013A00 is a fully factory preassembled hori-

zontal adapter and includes an insulated transition duct. The pres-

sure drop through the adapter curb is negligible.

For horizontal return applications: The power exhaust and baro-

metric relief dampers must be installed in the return air duct.

25% VENT AIR//

ECONOMIZER

HOOD

BLOCK-OFFJ___ i

PAN

A,R

OUT

HORIZONTALSUPPLY/

CURB (CRRFCURB013A00)

TRANSITION DUCT

FULLY INSULATED

SUPPLY PLENUM

1 1/2 # DENSITY,

STICK PINNED & GLUED

12" WIDE STANDING--

SEAM PANELS

ACCESSORY CURB

PACKAGE NO. HEIGHT

1'-11"

CRRFCURB013A00 (584

DESCRIPTION

Pre-Assembled, Roof Curb,

Horizontal Adapter

Fig. 1 -- Horizontal Supply/Return Adapter Installation

1 2 3 4 5 6 7 ... 55 56

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Carrier 48TJD Specifications Page 2

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