LG Multi V ARNU093TUD4 Engineering Manual page 55

AWG, 2 conductor, stranded, and shielded cable (RS-485), terminat-
ed via screw terminals on the control boards. The microprocessor
control algorithms provide the following functions: auto addressing,
self-diagnostics, auto restart following power restoration, test run,
and will operate the indoor unit using one of five operating modes:
1. Auto Changeover (Heat Recovery only)
2. Heating
3. Cooling
4. Dry
5. Fan Only
For Heat Recovery systems the Auto Changeover setting automati-
cally switches control of the indoor unit between cooling and heating
modes based on space temperature conditions.
For Heat Pump systems, heated or cooled air delivery is dependent
upon outdoor unit operating mode.
In Heating mode, the microprocessor control will activate indoor unit
operation when the indoor room temperature falls below setpoint
temperature. At which point, a signal is sent to the outdoor unit to
begin the heating cycle. The indoor unit fan operation is delayed until
coil pipe temperature reaches 76°F. Significant airflow is generated
when pipe temperature reaches 80°F. The unit is equipped with
an infrared receiver designed to communicate with an LG wireless
remote controller. In lieu of wireless remote or factory return air
thermistor, screw terminals on the microprocessor circuit board ac-
commodate various models of wall-mounted local controllers and/or
a wall-mounted remote temperature sensor. The unit microprocessor
is capable of accepting space temperature readings concurrently or
individually from either:
1. Wall-mounted wired controller(s)
2. Factory mounted return air thermistor or the optional wall-
mounted wired remote temperature sensor.
A single indoor unit has the capability of being controlled by up to
two local wired controllers. The microprocessor controls space tem-
perature using the value provided by the temperature sensor sensing
a space temperature that is farthest away from the temperature
set-point. The microprocessor control provides a cooling or heating
mode test cycle that operates the unit for 18 minutes without regard
to the space temperature. If the system is provided with an optional
wall-mounted, local, or central controller, displayed diagnostic codes
are specific, alpha numeric, and provide the service technician with
the reason for the code displayed.
FOUR-WAY CEILING CASSETTE
©
Mechanical Speci cations
The indoor units are Wi-Fi compatible with the addition of an LG Wi-
Fi module accessory, and can be controlled by LG's Smart ThinQ™
app on a smart device. A field-supplied Wi-Fi network and smart
device are required. The Smart ThinQ app is free, and is available
for Android™ and iOS. (Android is a trademark of Google LLC.)
Condensate Lift/Pump
The indoor unit is provided with a factory installed and wired conden-
sate lift/pump capable of providing a maximum 27-1/2 inch lift from
the bottom surface of the unit. The lift pump comes with a safety
switch that shuts off the indoor unit if condensate rises too high in
the drain pan.
Condensate Drain Pan
The condensate drain pan is constructed of EPS (expandable poly-
styrene resin).
Coil
The indoor unit coil is constructed with grooved design copper tubes
with slit coil fins, one (1) to two (2) rows, eighteen (18) to nineteen
(19) fins per inch.
Controls Features
• Auto changeover (Heat Recovery only)
• Auto operation
• Auto restart
• External on/off control
• Dual thermistor control
• Dual set-point control
• Filter life display
• Multiple auxiliary heater applications
• Group control
• High ceiling
• Hot start
• Self diagnostics
• Timer (on / off)
• Weekly schedule
• Auto direction / swing (up / down)
• Fan speed control
• Swirl wind (alternating vanes)
• Jet cool (fast cooling)
• Wi-Fi compatible
• Auto fan
• Leak detection
FOUR-WAY | 55