LG LD097HV4 Engineering Manual page 9

Compressors
The 9,000 ~ 24,000 Btu/h outdoor units are equipped with one
hermetically sealed, digitally controlled, inverter-driven twin rotary
compressor to modulate capacity (modulation in 1 Hz increments).
The 36,000 Btu/h outdoor unit is equipped with one hermetically
sealed, digitally controlled, inverter-driven scroll compressor to
modulate capacity (modulation in 1 Hz increments). Teflon coated
bearings, overcurrent protection, and vibration isolation are
integrated with the compressor.
Frequency ranges for the 9,000 ~ 36,000 Btu/h outdoor units are:
9k Btu/h = 20 Hz to 100 Hz
12k Btu/h = 20 Hz to 100 Hz
18 Btu/h = 15 to 80 Hz Cooling; 15 to 100 Hz Heating
24k Btu/h = 15 to 80 Hz Cooling; 15 to 100 Hz Heating
36k Btu/h = 15 to 120 Hz Cooling; 15 to 130 Hz Heating
Coil
Outdoor Unit
Heat pump outdoor unit coils are made of nonferrous louvered
aluminum fins protected with an integral coil guard. The coil for each
outdoor unit has a minimum of 14 fins per inch (FPI); heat exchanger
has two rows. The coil fins have a factory applied corrosion resistant
GoldFin™ material with hydrophilic coating tested in accordance with
ASTM B-117 salt spray test procedure for a minimum of 1,000 hours.
Coils are factory tested to a pressure of 551 psig.
Indoor Unit
Indoor unit coils are factory built and are comprised of aluminum fins
mechanically bonded to copper tubing. Each indoor unit has a mini-
mum of three rows of coils, which are pressure tested to 551 psig at
the factory. Each unit is provided with a factory installed condensate
drain pan below the coil.
Fans and Motors
Outdoor Unit
The 9,000 Btu/h (LUU097HV), 12,000 Btu/h (LUU127HV), 18,000
Btu/h (LUU189HV), and 24,000 Btu/h (LUU249HV) outdoor units
include one direct drive, variable speed axial / propeller type fan
with a horizontal air discharge; the 36,000 Btu/h outdoor unit
(LUU369HV) includes two fans. Fan blades are made of Acrylonitrile
Butadiene Styrene (ABS) material, and have a Brushless Digitally
Controlled (BLDC) fan motor. The fan motor has inherent
protection, permanently lubricated bearings, and variable speed with
a maximum speed up to 950 rpm. Raised guards are provided to limit
contact with moving parts.
Indoor Unit
The 9,000 Btu/h (LDN097HV4) indoor unit has 2 direct-drive
Sirocco fans. The 12,000 Btu/h (LDN127HV4) and 18,000 Btu/h
(LDN187HV4) indoor units have three direct-drive Sirocco fans. The
24,000 Btu/h (LHN248HV) indoor unit has one direct-drive Sirocco
fan.
MECHANICAL SPECIFICATIONS
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.
Ceiling-Concealed Ducted System
The 36,000 Btu/h (LHN368HV) indoor unit has two direct-drive,
Sirocco fans made of high strength ABS GP-2200 polymeric resin.
The fans are statically and dynamically balanced, mounted on a
common brushless digitally controlled (BLDC) motor, and 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. The
Auto setting adjusts the fan speed based on the difference between
the controller set-point and space temperature.
Air Filter - Indoor Unit
The return air inlet on the indoor unit includes a factory-supplied
removable, washable filter that is accessible from the back of the
unit. Options include a return filter box that holds a field-provided
high efficiency one or two inch MERV-rated filters, and a LG-supplied
air cleaner (each sold separately).
Electrical
The system is designed to operate using 208–230 / 60 /1 power with
voltage variances of ±10% and includes overcurrent protection. The
indoor unit is powered through the outdoor unit.
Controls
Indoor and outdoor units are factory wired with necessary electrical
control components, printed circuit boards, thermistors, sensors,
terminal blocks, and lugs for power wiring. Factory installed
microprocessor controls in the outdoor unit and indoor unit perform
functions to efficiently operate the single zone system,
communicating via an 14 AWG four stranded and shielded conductor
power/transmission cable. Microprocessor-based algorithms provide
component protection, soft-start capability, refrigeration system
pressure, temperature, defrost, and ambient control. System can be
operated through a simple wired remote controller (required, but sold
separately).
Condensate Lift/Pump
Figure 4: Ceiling-Concealed Ducted
The indoor unit is
System (LD187HV4 Low Static Model).
provided with a factory
installed and wired
condensate lift/pump
capable of providing
a minimum 27-9/16 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.
DUCTED | 9