LG AR-DE12-05A, Installation And Operation Manual

Page: 26 / 176

Installation
Lifting
1. Ensure that all shipping materials have been
removed from unit.
2. To assist in determining rigging requirements,
weights are provided in the Unit Weights &
Dimensions section of this manual.
3. Unit must be lifted by all lifting lugs provided at top
of unit.
4. Spreader bars must span the unit to prevent
damage to the cabinet by the lift cables.
5. Never rest the spreader bar on the unit
WARNING
Spreader bars are required to prevent damage to the
cabinet, failure to do so can result in damage that is
the installer’s responsibility.
6. Always test-lift the unit to check for proper balance
and rigging before hoisting to desired location.
7. Never lift unit by weatherhood.
8. Never lift units in windy conditions.
9. Preparation of curb and roof openings should be
completed prior to lifting unit to the roof.
10. Check to be sure that gasketing
(supplied by others) has been applied to the top of
the curb prior to lifting the unit and setting on the
curb.
11. Do not use fork lifts for handling unit on housing
sizes 12, 22, 32, or 35.
12. If using forklift on housing 02, use forks with 48-inch
length and ensure forks extend to opposite side of
the unit using factory-installed forklift pockets at unit
base.
Roof Curb Mounting
Roof curb details, including duct locations and
dimensions, are to be found in the roof curb assembly
instructions.
Rooftop units
require curbs to be mounted first. The
duct connections must be located so they will be clear
of structural members of the building.
1. Factory-Supplied Roof Curbs
Roof curbs are shipped in a knockdown kit (includes
duct adapters) and require field assembly (by others)
on all housing sizes except 35, which are shipped
assembled. Assembly instructions are included with
the curb kit.
2. Install Curb
Locate curb over roof opening and fasten in place.
Check that the diagonal dimensions are within ± 1/8
inch of each other and adjust as necessary. For
proper coil drainage and unit operation, it is important
that the installation be level. Shim the curb as
required to level. Install gasketing on top surface of
curb (provided by others).
3. Install Ductwork
Installation of all ducts should be done in accordance
with SMACNA and AMCA guidelines. Duct adapters
are provided to support ducts prior to setting the unit.
4. Set the Unit
Lift unit to a point directly above the curb and duct
openings. Guide unit while lowering to align with duct
openings. Roof curbs fit inside the unit base. Make
sure the unit is properly seated on the curb and level.
5. Install Vestibule
If unit was ordered with a vestibule and it has not yet
been attached to the unit, caulk and attach the
vestibule at this time.
Typical Unit with Condensing Section and
Factory-Supplied Curb Kit