Multi F Engineering Manual

FOUR-WAY CEILING CASSETTE INDOOR UNITS
0HFKDQLFDO6SHFL¿FDWLRQVDQG)HDWXUHV
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 statically
and dynamically balanced. The fan motor is brushless digitally con-
trolled (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 di-
UHFWGLJLWDOFRQWURODOJRULWKPWKDWSURYLGHVSUHSURJUDPPHG¿HOGVH-
OHFWDEOH¿[HGRUDXWRIDQVSHHGVLQWKH+HDWLQJDQG&RROLQJPRGHV
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, 14" x 14" x 1", remov-
able, washable 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 acry-
lonitrile butadiene styrene (ABS)
polymeric resin with a tapered trim
edge.
Airflow Guide Vanes
The supply air outlet has four-di-
rectional slot diffusers, each equipped with an independent oscillat-
LQJPRWRUL]HGJXLGHYDQHWRFKDQJHDLUÀRZGLUHFWLRQ$JXLGHYDQH
DOJRULWKPVHTXHQWLDOO\FKDQJHVWKHSUHGRPLQDQWGLVFKDUJHDLUÀRZ
direction in counterclockwise pattern, or can be used to lock each
JXLGHYDQHLQGHSHQGHQWO\LQD¿HOGDGMXVWHG¿[HGSRVLWLRQ7KHIRXU
vanes can be individually adjusted from the wired remote controller to
FXVWRPL]HWKHDLUÀRZSDWWHUQIRUWKHFRQGLWLRQHGVSDFH$VHWWLQJLQ
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 microprocessor 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.
7KHLQGRRUXQLWVDUH:L)LFRPSDWLEOHZLWKWKHDGGLWLRQRIDQ/*:L
)LPRGXOHDFFHVVRU\DQGFDQEHFRQWUROOHGE\/*¶V6PDUW7KLQ4
DSSRQDVPDUWGHYLFH$ILHOGVXSSOLHG:L)LQHWZRUNDQGVPDUW
device are required. The Smart ThinQ app is free, and is available
IRU$QGURLGDQGL26$QGURLGLVDWUDGHPDUNRI*RRJOH//&
Controls
The indoor unit casing has a factory-standard, integral infrared
sensor designed to communicate with the supplied LG wireless
handheld remote controller. An optional wired controller is available
as an additional accessory. Communication between the indoor units
DQGWKHRXWGRRUXQLWLVDFFRPSOLVKHGWKURXJK$:*IRXUFRUH
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.
• Inverter (Variable speed fan)
• Internal drain pump
• Jet cool
• Control lock function
• Auto operation
• Auto restart operation
• 24-Hour on/off timer
• Two thermistor control
• 5HTXLUHGDFFHVVRU\JULOOH374&+:RU
PT-UQC) sold separately
• Group Control
• Plasma kit (PTPKQ0) sold separately
• :LUHOHVV/&'UHPRWHFRQWUROLQFOXGHG
wired thermostat available (sold separately)
• :L)LFRPSDWLEOH
Features
)LJXUH0XOWL))RXU:D\
Ceiling-Cassette Indoor Unit.
'XHWRRXUSROLF\RIFRQWLQXRXVSURGXFWLQQRYDWLRQVRPHVSHFL¿FDWLRQVPD\FKDQJHZLWKRXWQRWL¿FDWLRQ
©/*(OHFWURQLFV86$,QF(QJOHZRRG&OLIIV1-$OOULJKWVUHVHUYHG³/*´LVDUHJLVWHUHGWUDGHPDUNRI/*&RUS
114 | CEILING-CASSETTE
Multi F and Multi F MAX Indoor Unit Engineering Manual
MULTI
F
MAX
MULTI
F