LG AR-DE12-05A, Installation And Operation Manual

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Subassemblies
Blower -
Either one or two plenum-type fans. All units
are equipped with a plenum fan for Supply Air and a
second may be selected for Exhaust (Relief) Air.
Coils -
Evaporator coil (optional)
Condenser coil (optional, packaged DX only)
Indoor coil (optional, air-source heat pump only)
Outdoor coil (optional, air-source heat pump only)
Water coil (optional)
Reheat coil (optional)
Compressors -
Each unit having packaged DX will
have either one, two or four refrigerant compressors.
Optionally, one of the compressors may be a digital
scroll type compressor. Air-source heat pump units will
have one inverter scroll compressor and may contain a
second staged compressor.
Dampers -
Motorized intake air damper, optional
motorized recirculating damper, optional return air
damper. Optional gravity-type exhaust damper.
Optional Barometric Relief Damper -
Used during
the unit’s economizer mode for when building pressure
increases, the relief damper will open due to over-
pressurization.
Electric Heater -
An SCR controlled electric heater (not
shown) is available on the units. It requires a separate
power supply and has its own control panel. See unit-
specific wiring diagram.
Supply
Filters
–
All housings are available with a filter
bank depth of either 2 or 4-inch.
Indirect Gas-Fired Furnace -
Furnace model PVG is
available on AR-DR02, AR-DR12, AR-DE12, AR-
DR22, and AR-DE22. Models AR-DR32 and AR-DE32
use furnace model PVG 600-800 or model HMA 1000-
1200. Models AR-DR35 and AR-DE35 use furnace
model HMA 600-1200.
Packaged DX System -
Any unit may be ordered
with a packaged DX system. Housing size 02 will
include one compressor; housing size
12 will include one or two compressors; housing size 22
will include two compressors; housing size 32 will
include three compressors; housing size 35 will include
four compressors; a condenser coil(s) and evaporator
coil(s) and all required components. Units that have
packaged DX are charged with R410A refrigerant. Do
not use tools or parts designed for other refrigerants on
these units.
Air-source Heat Pump
– Units having an air-source heat
pump will include either one or two compressors, an
indoor and outdoor coil, and all required components.
Air-source heat pump units are charged with R410A
refrigerant. Do not use tools or parts designed for other
refrigerants on these units. Not currently available on
housing sizes 02, 32, 35.
Split DX
– The unit may be ordered with a split DX
system for connection to a building cooling system.
Thermal expansion valve (TXV) is field-provided.
Vestibule -
Some units may be ordered with a factory-
assembled vestibule that is to be field-attached to the
side of the unit. See lifting instructions.