Engineering Manual

Installation and Best Layout Practices
Selecting the Best Location
Do’s
• Place the unit where air circulation will not be blocked.
• Place the unit where drainage can be obtained easily.
• Place the unit where noise prevention is taken into consideration.
• Ensure there is sufcient strength to bear the load of the indoor unit.
• Ensure there is sufficient maintenance space.
• Locate the indoor unit in a location that is level, and where it can be easily connected
to the outdoor unit / branch distribution unit.
DUCT (LOW STATIC) INDOOR UNITS
Figure 129:General Installation Guidelines.
Model / Capacity (Btu/h)
Dimensions (in.)
A B
LMDN096HV / 9,000
31-1/2
31-1/2
LMDN126HV / 12,000
39-3/8
LMDN186HV / 18,000
Table 52:General Access Panel Dimensions.
If the unit is installed near a body of water, certain components are at risk of being
corroded. Appropriate anti-corrosion methods should be taken for the unit and all
components.
Installing in an Area Exposed to Unconditioned Air
In some installation applications, areas(floors, walls) in some rooms may be ex-
posed to unconditioned air (room may be above or next to an unheated garage
or storeroom). To countermeasure:
• Verify that carpet is or will be installed (carpet may increase the temperature
by three degrees).
• Add insulation between the floor joists.
• Install radiant heat or another type of heating system to the floor.
Installing in an Area with High Humidity Levels
If the environment is prone to humidity levels of 80% or more (near the ocean,
lakes, etc.) or where steam could collect in the plenum:
• Install additional insulation to the indoor unit (glass wool insulation >13/32
inches thick).
• Install additional insulation to the refrigerant piping (insulation >13/16 inches
thick).
• Seal all gaps between the indoor unit and the ceiling tiles (make the area air
tight) so that humidity does not transfer from the plenum to the conditioned
space. Also, add a ceiling grille for ventilation.
Don’ts
• The unit should not be installed near a heat or steam source, or where considerable
amounts of oil, iron powder, or flour are used.
• The unit should not be installed where sulfuric acid and flammable or corrosive gases
are generated, vented into, or stored.
• Avoid installing the unit near high-frequency generators or near any equipment that gen-
erates an electromagnetic field (minimum 3-1/3 feet away).
• Do not install the unit near a doorway.
The unit may be damaged, may malfunction, and / or will not operate as
designed if installed in any of the conditions listed.
Access Opening
(
23-5/8
x
23-5/8
)
Control box
H = ≤25/32
• "H" dimension is necessary to ensure a slope is included for
condensate drainage.
Side view
23-5/8
23-5/8
(Unit : Inch)
(Unit : Inch)
Top view
A (Min)
Ceiling
Service Space
A
B
B (Min)
Figure 130:Service / Access Panel Dimensions.
Due to our policy of continuous product innovation, some specications may change without notication.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
102 | DUCT (LOW STATIC)
Multi F and Multi F MAX Indoor Unit Engineering Manual
MULTI
F
MAX
MULTI
F