Carrier 48TJ016-028 - Manual (Page 2)

INSTALLATION
Inspect unit for transportation danage. If cktmage is found,
file claim with transportation agency.
Step 1 — Provide Unit Support
ROOF CURB — Assemble and install accessoiy roof curb or
horizontiil adapter roof cuifi in accordance witli instinctions
shipped with this accessoiy. 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 adapter roof curb should be
level. Tills is necessaiy to permit unit drain to function proper­
ly. Unit leveling tolerance is ± Vu, in. per linear ft in any direc­
tion. Refer to Accessoiy Roof Curb or Horizontal Adapter
Roof Curb Installation Instmctions for additional information
as required. When accessoiy 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 setil.
InstiJI gasket with the roof curb or adapter as shown in
Fig. 2. Improperly applied gasket can also 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 di'op unit;
keep upright. Use spreader biu's over unit to prevent sling or
cable diimage. Rollers may be used to move unit across a roof.
Level by using unit frame as a reference; leveling tolerance is
±V](i in. per linear ft in any direction. See Fig. 3 for additional
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 instmctions 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 contaminated
air. For proper unit operation, adequate combustion and venti­
lation ail' 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 Standards Institute).
Although unit is weatlierproof, guard against water from
higher level mnoff and overhangs.
Locate mechanical di'aft 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.
Instructions continued cm page 9.
NOTE: CRRFCURB013A00 is a fuliy factory prsassembied 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. ACCESSORY
PACKAGE NO.
CRRFCURB013AOO
CURB
HEIGHT
(584)
DESCRIPTION
Pre-Assembled, Roof Curb,
Horizontal Adapter
Fig. 1 — Horizontal Supply/Return Adapter Installation