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Duct Connections
The unit is shipped in the vertical (bottom) duct
configuration. To convert to horizontal ducted
configuration, remove screws from the side duct
opening covers and remove the covers.
Using the same screws, install the covers on the
vertical duct openings. Seals around duct openings
must be tight
13.0
12.6
13.0
12.6
General Mounting - Curb
Roof
curb
details,
including
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
Factory-Supplied Roof Curbs
1.
Roof curbs are model GKD which are shipped in
a knockdown kit (includes duct adapters) and
require field assembly (by others). Assembly
instructions are included with the curb kit.
Install curb
2.
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 typical roof curb
is shown in figure 3.
[Unit : Inch]
10.9
25.7
10.9
25.7
duct
locations
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.
Install Duct Work
3.
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
Note:
• 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
Roof Ductwork Configuration
When the supply air discharge opening and/or the
return air intake opening are located on the bottom
of a unit, the ductwork must be connected to the
curb directly. The actual opening sizes in the floor
of the unit are not specified as they are
slightly undersized from the duct dimensions shown
on the following curb drawings.
Figure 3. Roof Curb Drawing
E
F
G
A
B
C
D
H
I
K
J
[Unit : Inch]
21
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