Four-Way Ceiling Cassette Indoor Units; Mechanical Specifications And Features - LG MULTI F Engineering Manual

FOUR-WAY CEILING CASSETTE INDOOR UNITS

Mechanical Specifications and Features

Four-Way Ceiling-Cassette Indoor Units
General
All LG indoor units are factory assembled, wired, piped, and pro-
vided with a control circuit board, fan, and motor. Four-way ceiling-
cassette units have a sound rating no higher than 38 dB(A) as tested
per KSA0701 ISO Standard 3745.
Coil
Indoor unit coils are factory built and are comprised of aluminum fins
mechanically bonded to copper tubing. Each unit has 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 case is constructed of a galvanized steel plate designed to recess
in the ceiling, and has a surface mounted concentric grille on the bot-
tom of the unit. Unit has four supply air outlets and one return air inlet.
Ventilation Air
The case has a factory designated knockouts to connect a field-
supplied, pressurized, and filtered outside air duct.
Fan Assembly and Control
All indoor units have a single, direct-drive turbo fan. Fans are manu-
factured of high-strength ABS HT-700 polymeric resin that is stati-
cally and dynamically balanced. The fan motor is brushless digitally
controlled (BLDC) with permanently lubricated and sealed ball bear-
ings. The fan / motor assembly is mounted on vibration-attenuating
rubber grommets. Fan speed is controlled using a microprocessor-
based direct digital control algorithm that provides pre-programmed,
field-selectable fixed or auto fan speeds in the Heating and Cooling
modes.
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. Auto setting adjusts the fan speed based on the dif-
ference between the controller setpoint and space temperature.
Air Filter
Return air is filtered with a factory-supplied, removable, washable
Features
• Inverter (Variable speed fan)
• Internal drain pump
• Jet cool
• Control lock function
• Auto operation
130 | CEILING-CASSETTE
• Auto restart operation
• 24-Hour on/off timer
• Two thermistor control
• Required accessory grille (PT-UQC)
sold separately
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.
filter accessible from the bottom
of the unit. A plasma filter is
also available as an optional
accessory.
Architectural Grille
An architectural grille is sold as
a separate required accessory.
The four-way grille is off-white
acrylonitrile butadiene styrene
(ABS) polymeric resin with a
tapered trim edge.
Airflow Guide Vanes
The supply air outlet has four-directional slot diffusers, each equipped
with an independent oscillating motorized guide vane to change
airflow direction. A guide vane algorithm sequentially changes the
predominant discharge airflow direction in counterclockwise pattern,
or can be used to lock each guide vane independently in a field-
adjusted fixed position. The four vanes can be individually adjusted
from the wired remote controller to customize the airflow pattern for
the conditioned space. A setting in the cooling and heating modes can
cycle the vanes up and down for uniform / random air distribution.
Microprocessor Control
The indoor unit is provided with an integrated control panel to com-
municate with the outdoor unit. All unit operation parameters are
stored in non-volatile memory residing on the unit microprocessor. The
microprocessor controls space temperature through using the value
provided by the temperature sensor within the indoor unit. The micro-
processor control will activate indoor unit operation when the indoor
room temperature 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 will also provide 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
sensor designed to communicate with the supplied LG wireless
handheld remote controller. An optional 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 Lift/Pump
The indoor unit is provided with a factory installed and wired internal
condensate lift/pump capable of providing a minimum 27.5 inch lift
from the bottom surface of the unit. Drain pump has a safety switch
to shut off the indoor unit if the condensate rises too high in the drain
pan.
• Group Control
• Plasma kit (PTPKQ0) sold separately
• Wireless LCD remote control included;
wired thermostat available (sold
separately)
F
MULTI
F
MULTI MAX
Figure 185: Multi F Four-Way
Ceiling-Cassette Indoor Unit.