Horizontal Installation - LG MULTI F Engineering Manual

VERTICAL-HORIZONTAL INDOOR UNITS
Installation and Best Layout Practices
Vertical-Horizontal Air Handling Units can be installed in a choice of vertical (upflow) or horizontal (left side) configurations.
Vertical (Upflow) Installation
• Unit must be positioned properly for plenum / duct installation.
• To maintain proper air flow, minimum height clearance is 14 inches.
• Plenum must be strong and secure enough to support the installation of adapter collars to accommo-
date duct work.
• Air handler platform should be sturdy enough to support the frame, plus any accessories (i.e., filter
box).
• To prevent air leaks, seal all duct work according to local codes, but make sure that filter access is still
unobstructed.
• Vibration isolators (field supplied) must be installed between the unit frame and the platform. If neces-
sary, provide the installing contractor with an illustration of where the vibration isolator should be added
and how it should be positioned.
Do not install the screws on the front and back of the unit, doing so may block filter installation.

Horizontal Installation

• Units must be installed so that the access panels face to the side,
not facing up or down.
• Installation must be in accordance with all relevant building codes,
which may necessitate the installation of an external condensate
pan (position the unit in or above the external condensate pan).
• If the units are going to be suspended, use angled steel support
brackets with threaded rods to provide support from the bottom.
The brackets / threaded rods should be comparatively bigger /
longer than the unit, and each must be centered on the part of the
frame it supports.
• If the unit will not be suspended, still use angled steel support
brackets, but also add vibration isolators (field supplied) to avoid
sound transmission. If necessary, provide the installing contractor
with an illustration of where the vibration isolator should be added
and how it should be positioned.
• Unit must be positioned properly for plenum / duct installation.
• Plenum must be strong and secure enough to support the installa-
tion of adapter collars to accommodate duct work.
To ensure proper drainage for horizontal installations, unit must be installed within ±1/8 inches level of the unit's length and width.
166 | VERTICAL-HORIZONTAL Due to our policy of continuous product innovation, some specifications may change without notification.
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Figure 229:Horizontal Installation.
Field-Supplied
Supply Air Duct
>1-1/2 inch x 1-1/2 inch Angle
Recommended length >26 inches
with a 2-inch clearance on both
sides of the unit
Suspension Bolt Locations
Table 96:Bracket / Bolt Position Dimensions.
Capacity
(Btu/h)
A
24,000
4
36,000
F
MULTI
F
MULTI
Figure 228:Vertical Installation /
Attaching the Bottom Duct.
Field Supplied
Supply Air Duct
Field Supplied
Return Air Duct /
Plenum
Use > 6 Screws (M4*25L)
Field Supplied
>3/8 inch Threaded Rod
Return Air Duct / Plenum
A
B
C
Dimensions (inches)
B C
23 41-11/32
MAX
>1 inch