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FOUR-WAY VAHU INDOOR UNITS
Mechanical Specications and Features
Four-way Vertical-Horizontal Air
Handing Indoor Unit
General
All LG indoor units are factory assembled, wired, piped, and provided
with a control circuit board, and constant CFM ECM fan. Vertical-
Horizontal Air Handling units are designed for high-speed air volume
against an external static pressure up to 0.7″WG. Supply air opening
is flanged to accept field-installed ductwork that cannot exceed the
external static pressure limit of the unit.
Coil
Indoor unit coils are factory built and are comprised of aluminum ns
mechanically bonded to copper tubing. Each unit has a minimum of
two rows of coils, which are pressure tested at the factory. Each unit is
provided with a factory installed condensate drain pan below the coil.
Refrigerant System
System is designed for use with R410A refrigerant. The refrigeration
circuit is pressure-tested at the factory and shipped with a holding
charge of helium gas. Refrigerant pipe connections are 45° flare,
and all refrigerant lines from the outdoor unit to the indoor units must
be field insulated.
Electrical
Each indoor unit is designed to operate using 208–230/60/1 power
with voltage variances of ±10%.
Casing
The casing is designed to mount fully concealed behind a wall or
above a finished ceiling. Casing is manufactured of 22-gauge metal
and finished with a high-gloss baked enamel finish. Cold surfaces of
the unit are covered internally with 1/2-inch polystyrene fiber insula-
tion; inside surface of the pan assembly door access panel is treated
with 1/2-inch polystyrene fiber insulation, encapsulated on both
sides. The access panel is sealed along the edges with reinforced
foil-faced covering, all access panels also have gasket seals to
minimize air leaks.
The vertical-horizontal air handling unit can operate in one of four
airflow configurations: vertical upflow, vertical downflow, horizon-
tal left discharge, or horizontal right discharge. Vertical downflow
operation requires an optional conversion kit. In the vertical position,
the unit has an opening for supply air from top (or bottom) with a
dedicated bottom (or top) vertical return. In the horizontal position,
supply air is from the left (or right) end with the return air from the
right (or left) end. Unit can also accept an internal, optional LG
electrical strip heater.
Fan Assembly and
Control
The units have an integral
fan assembly consisting of
galvanized steel housing and a
forward curve fan wheel. The ECM
(electronically commutated motor)
fan is programmed to deliver con-
stant CFM regardless of permitted
ESP (external static pressure),
and has 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 digital control algorithm. The
indoor fan has Low, Med, High,
and Auto settings for Cooling
mode; and has Low, Med, High,
and Auto settings for Heating
mode. Low, Med and High fan
speeds maintain published airow
as the ECM motor adjusts to ESP. The Auto setting adjusts the fan
speed to most effectively achieve setpoint.
Filter Assembly
The unit comes with a filter rack sized to hold a field-provided 16”
x 20” x 1” filter cartridge. The filter rack has a guide to assist in
centering the filters, and can be accessed from the front.
Microprocessor Control
The indoor unit is provided with an integrated control board to
communicate with the outdoor unit. All unit operation parameters
are stored in non-volatile memory resident on the unit microproces-
sor. The microprocessor controls space temperature through using
the value provided by temperature sensors within the indoor unit. A
field-supplied communication cable must be installed to connect the
indoor unit(s) to the outdoor unit.
Controls
The indoor unit controller of choice must be ordered separately.
Communication between the indoor units and the outdoor unit is ac-
complished through 14 AWG, four-core, stranded and shielded power
/ communication cable. The indoor unit has a built-in dry contact for a
eld supplied 3rd party thermostat. An optional Wi-Fi module is avail-
able as an additional accessory for use with LG’s Smart ThinQ app on
a smart device.
Condensate
The unit is designed for gravity draining of condensate.
• Inverter (Variable speed fan)
• Control lock function
• Auto operation
• Dehumidifying function
• Two thermistor control
• Group control
• Optional accessory electric heater
• Self-diagnostics function
• Built-in dry contact for third party
thermostat
• Wired controller ordered separately
• Constant CFM ECM fan
Features
Figure 243: Multi F Vertical-Horizontal
Air Handling Indoor Unit.
Due to our policy of continuous product innovation, some specications may change without notication.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
180 | VERTICAL-HORIZONTAL
Multi F and Multi F MAX Indoor Unit Engineering Manual
MULTI
F
MAX
MULTI
F
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