Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
20
Roof Curb Mounting
WARNING
•
Mold can cause personal injury. Some materials such as
gypsum wall board can promote mold growth when damp.
Such materials must be protected from moisture that can
enter units during maintenance or normal operation.
•
The bottom of the unit must be field-insulated if outdoor air
can contact the bottom of the unit. To avoid leakage,
Do not
drill or punch holes in the floor of the unit
•
Gasket material must be applied to all surfaces of the curb
which contact the unit to create proper seal between the unit
and the curb
•
If wind load restraints are needed, hire local engineer to
design wind load restraints
Locate the roof curb and unit on a portion of the roof that
can support the weight of the unit. The unit must be
supported to prevent bending or twisting of the machine.
If building construction allows sound and vibration into
the occupied space, locate the unit over a non-critical
area. It is the responsibility of the system designer to
make adequate provisions for noise and vibration in the
occupied space.
Install the curb and unit level to allow the condensate
drain to flow properly and allow service access doors to
open and close without binding. 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. 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 gasket on top surface of curb
(provided by others). Assembly of a roof curb is
shown in figure 4.
2. Install Duct Work
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
3. 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.
Figure 4: Roof Curb Assembly (For Reference Only)
