General; Receiving And Installation; Check Equipment; Identify Unit - Carrier 50GL030 Installation, Start-Up, And Operating Instructions Manual

injury or product and property damage. NOTE and IMPORTANT
are used to highlight suggestions which will result in enhanced
installation, reliability, or operation.
The power supply (volts, phase, and hertz) must correspond to that
specified on unit rating plate.
The electrical supply provided by the utility must be sufficient to
handle load imposed by this unit.
This installation must conform with local building codes and with
NEC (National Electrical Code) and NFPA 70, NFPA 54/ANSI
Z223.1 latest revision, and NFGC (National Fuel Gas Code). Refer
to provincial and local plumbing or waste water codes and other
applicable local codes.
Approved for outdoor installation on wood flooring or on class A,
B or C roof covering materials.
These instructions cover minimum requirements and conform to
existing national standards and safety codes. In some instances,
these instructions exceed certain local codes and ordinances,
especially those that may not have kept up with changing residen-
tial construction practices. We require these instructions as a
minimum for a safe installation.
GENERAL — The 50GL units are fully self-contained, and de-
signed for outdoor installation (See Fig. 1). See Fig. 2 and 3 for
unit dimensions. All unit sizes have discharge openings for both
horizontal and downflow configurations, and are factory shipped
with all duct openings covered . Units may be installed either on
a rooftop, ground-level cement slab, or directly on the ground if
local codes permit. See Fig. 4 for roof curb dimensions.

RECEIVING AND INSTALLATION

Step 1—Check Equipment
IDENTIFY UNIT — The unit model number and serial number
are stamped on unit identification plate. Check this information
against shipping papers and job data.
INSPECT SHIPMENT — Inspect for shipping damage while unit
is still on shipping pallet. If unit appears to be damaged or is torn
loose from its anchorage, have it examined by transportation
inspectors before removal. Forward claim papers directly to
transportation company. Manufacturer is not responsible for any
damage incurred in transit. Check all items against shipping list.
Immediately notify the nearest Carrier Air Conditioning office if
any item is missing. To prevent loss or damage, leave all parts in
original packages until installation.
Step 2—Provide Unit Support
ROOF CURB — Install accessory roof curb in accordance with
instructions shipped with curb (See Fig. 4 for roof curb dimen-
sions). Install insulation, cant strips, roofing, and flashing. Duct-
work must be attached to curb.
IMPORTANT: The gasketing of the unit to the roof curb is critical
for a watertight seal. Install gasketing material supplied with the
roof curb. Improperly applied gasketing can also result in air leaks
and poor unit performance. Curb should be level to within 1/4 in.
(See Fig. 7). This is necessary for unit drain to function properly.
Refer to accessory roof curb installation instructions for additional
information as required.
SLAB MOUNT — Place the unit on a solid, level concrete pad
that is a minimum of 4 in. thick with 2 in. above grade. The slab
should extend 2 in. on sides of the unit. Do not secure the unit to
the slab except when required by local codes.
GROUND LEVEL — If local codes permit, the unit can be placed
directly on the ground. Prepare a level gravel foundation for proper
drainage.
Step 3—Field Fabricate Ductwork
Secure all ducts to roof curb and building structure on vertical
discharge units. Do not connect ductwork to unit. For horizontal
applications, unit is provided with flanges on the horizontal
openings. All ductwork should be secured to the flanges. Insulate
and weatherproof all external ductwork, joints, and roof openings
with counter flashing and mastic in accordance 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 applicable fire codes. A minimum clearance is not
required around ductwork. Cabinet return-air static shall not
exceed -.25 in. wg.
Step 4—Provide Clearances
The required minimum operating and service clearances are shown
in Fig. 2 and 3. Adequate ventilation and condenser air must be
provided.
Do not restrict condenser airflow. An air restriction at either
the outdoor-air inlet or the fan discharge can be detrimental to
compressor life.
The condenser fan draws air through the condenser coil and
discharges it through the top fan grill. Be sure that the fan
discharge does not recirculate to the condenser coil. Do not locate
the unit in either a corner or under an overhead obstruction. The
minimum clearance under a partial overhang (such as a normal
house overhang) is 36-in. above the unit top. The maximum
horizontal extension of a partial overhang must not exceed 48 in.
Do not place the unit where water, ice, or snow from an overhang
or roof will damage or flood the unit. Do not install the unit on
carpeting, tile, or other combustible materials.
Step 5—Rig and Place Unit
Rigging and handling of this equipment can be hazardous for many
reasons due to the installation location (roofs, elevated structures,
etc.)
Only trained, qualified crane operators and ground support staff
should handle and install this equipment.
When working with this equipment, observe precautions in the
literature, on tags, stickers and labels attached to the equipment,
and any other safety precautions that might apply.
Follow all applicable safety codes. Wear safety shoes and work
gloves.
INSPECTION — Prior to initial use, and at monthly intervals, all
rigging brackets and straps should be visually inspected for any
damage, evidence of wear, structural deformation, or cracks.
Particular attention should be paid to excessive wear at hoist
hooking points and load support areas. Brackets or straps showing
any kind of wear in these areas must not be used and should be
discarded.

INSTALLATION

1. Remove unit from shipping carton. Leave top shipping skid on
the unit as a spreader bar to prevent the rigging straps from
damaging the unit. If the wood skid is not available, use a
spreader bar of sufficient length to protect unit from damage.
2. Position the lifting bracket assembly around the base of the
unit. Be sure the strap does not twist.
3. Place each of the 4 metal lifting brackets into the handholds in
the composite pan.
2