Engineering Manual
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52 | STD. WALL-MOUNTED
Multi F and Multi F MAX Indoor Unit Engineering Manual
MULTI
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MAX
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STANDARD WALL-MOUNTED INDOOR UNITS
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Figure 67: Multi F Standard Wall-Mounted Indoor Unit.
Standard Wall-Mounted Indoor Units
General
All LG indoor units are factory assembled, wired, piped, and pro-
vided with a control circuit board, fan, and motor. Standard Wall-
Mounted units have a sound rating no higher than 42 dB(A) as tested
per KSA0701 ISO Standard 3745.
Coil
Indoor unit coils are comprised of a minimum of two rows of
aluminum fins mechanically bonded to copper tubing. The coils are
pressure tested at the factory. Each unit is provided with a factory
installed condensate drain pan below the coil.
Refrigerant System
The system is designed for use with R410A refrigerant. The refrig-
eration circuit is pressure-tested at the factory and shipped with a
holding charge of helium gas. Refrigerant pipe connections are 45°
flare. All refrigerant lines from the outdoor unit to the indoor units
must be field insulated.
Electrical
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variance of no more than ±10%.
Casing
The units mount on a vertical surface. They are shipped with a sepa-
rate back plate that secures the unit to the wall, protruding no more
than ten (10) inches. Refrigerant piping can be installed in one (1) of
four (4) different directions.
Finish
The Standard Wall-Mounted unit has a curved architectural panel
with a pearl white finish. Unit casing has a pearl white or dark gray
finish and is manufactured of heavy-duty acrylonitrile butadiene
styrene (ABS) and high impact polystyrene (HIPS) plastic.
Fan Assembly and Control
The unit has a single, direct-drive, crossflow fan made of high
strength ABS plastic. The fan motor is brushless digitally controlled
(BLDC) with permanently lubricated and sealed ball bearings. The
fan / motor assembly is mounted on vibration attenuating rubber
grommets. Fan speed is controlled using a microprocessor-based
direct digitally controlled algorithm that provides pre-programmed,
field-selectable fixed or auto fan speeds in the Heating and Cooling
modes. For Standard Wall-Mounted units, the indoor fan has Low,
Med, High, Power Cool and Auto settings for Cooling mode; and
has Low, Med, High, and Auto settings for Heating mode. The Auto
setting adjusts the fan speed based on the difference between the
controller setpoint and space temperature. Also, the separate Chaos
setting provides a simultaneous and random change in fan speed
and flow direction at the discharge, simulating a natural outdoor
breeze.
Air Filter
The return air inlet has a factory-supplied primary removable, wash-
able filter. The unit is also equipped with a secondary 3M filter. Fil-
ters are accessed from the front of the unit without the use of tools.
Airflow Guide Vanes
A factory-installed motorized guide vane controls the direction of
airflow from side to side. A motorized louver provides an automatic
change in airflow by directing the air up and down for uniform air
distribution.
Microprocessor Control
The indoor unit has an integrated control panel to communicate with
the outdoor unit. All unit operation parameters are stored in non-
volatile memory resident on the unit microprocessor. The micropro-
cessor controls space temperature through using the value provided
by the temperature sensor within the indoor unit. The microprocessor
control will activate indoor unit operation when the indoor room tem-
perature falls below or rises above a setpoint temperature, at which
point, a signal is sent to the outdoor unit to begin the appropriate
mode. The microprocessor also provides self-diagnostics and auto
restart functions. A field-supplied four-wire power / communications
cable must be installed to connect the indoor unit(s) to the outdoor
unit.
Controls
The indoor unit casing has a factory-standard, integral infrared sen-
sor to communicate with the supplied LG wireless handheld remote
controller. An optional LG supplied wired controller is available as
an additional accessory. Communication between the indoor units
and the outdoor unit is accomplished through 18 AWG, four-core,
stranded and shielded power / communication cable.
Condensate
The unit is designed for gravity draining of condensate and includes
a flexible drain hose capable of installation in one of two directions.
The unit also includes a connection that is compatible with the Aqua-
Guard
®
AG-9300-LG condensate sensor.
• Inverter (Variable speed fan)
• Chaos swing
• Secondary filter (3M)
• Jet cool
• Group control
• Self-cleaning indoor coil
• Auto operation
• Auto restart operation
• Dehumidifying function
• Self-diagnostic function
• Wireless LCD remote control included; wired
thermostat available (sold separately)
Features