Mechanical Specifications - LG Multi V mini Engineering Manual

MECHANICAL SPECIFICATIONS

VRF Multi V™ Mini Air Source Units—ARUN 036, 047, 053
VRF Multi V™ Mini Air Source Units
(036, 047, 053)
General
The LG Multi V Mini heat pump system consists of an outdoor
unit, one or more indoor units, integrated system controls, and
interconnecting field-provided refrigerant pipe containing vari-
ous fittings including Y-Branch kits and Header kits supplied by
LG. LG components are manufactured in a facility that meets or
exceeds International Organization for Standardization (ISO) 9001
and 14001. The units are listed by Intertek (ETL) and bear the
ETL listed mark.
Casing
The outdoor unit case is constructed from 22-gauge coated
metal. Exterior panels are cleaned and finished with a weather
resistant baked enamel finish. An easily removable front corner
panel is provided to allow access to major components and control
devices. Outdoor unit fans are covered with guards made of
heavy gauge, heavy duty polymeric resin. The outdoor unit coil is
protected with a heavy gauge steel wire guard finished with baked
enamel. Paint color is "warm gray."
Refrigeration System
The refrigeration system consists of a single refrigeration circuit
and uses refrigerant R410A. The outdoor unit is provided with fac-
tory installed components, including a refrigerant strainer, check
valves, oil separator, accumulator, hot gas bypass valve, liquid
injection valve, 4-way reversing valve, electronic controlled expan-
sion valve (EEV), high and low side charging ports, service valves,
and interconnecting piping. Also included is an integral subcooler
assembly consisting of a double spiral tube type heat exchanger
and EEV providing refrigerant subcooling modulation up to 23°F.
The unit comes factory charged with 6.6 pounds of refrigerant.
Refrigeration Oil Control
The refrigeration oil level in the compressor is maintained using
a two-stage oil control system. The compressor discharge port
is equipped with an oil filtering device designed to restrict oil
loss from the compressor. The high-pressure discharge vapor
leaves the compressor and immediately enters a centrifugal oil
separator that has no moving parts designed to extract oil from
the refrigerant gas stream. A gravity drain returns captured oil
back to the compressor sump. The outdoor unit microprocessor is
programmed to flush the refrigerant piping system for a minimum
period of three minutes after six hours of compressor operation.
Single Inverter/Compressor
The outdoor unit is equipped with one hermetic, digitally-con-
96 SPECIFICATIONS
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trolled, inverter driven, rotary compressor. The compressor is spe-
cifically designed for the refrigerant provided and is manufactured
by LG. The frequency inverter is designed by LG and is capable
of providing a modulation range from 25Hz–90Hz in Cooling mode
and 25Hz–100Hz in Heating mode. The compressor motor is suc-
tion gas-cooled and has an acceptable voltage range of ±10% of
nameplate voltage. The compressor is equipped with a crankcase
heater and back seated service valves.
External suction and discharge temperature and pressure sensors
are provided to protect the compressor from damage caused by
over/under temperature or over/under pressure conditions. The
compressor is provided with a positive displacement oil pump
providing sufficient oil film on all bearing surfaces across the entire
inverter modulation range. The compressor is factory charged
with Polyvinylether (PVE) refrigeration oil having no hygroscopic
properties. Compressor bearings are Teflon® coated. The
compressor is wrapped with a heat resistant, sound attenuating
blanket and mounted on rubber isolation grommets.
Outdoor Unit Coil
Outdoor unit coils are a minimum of two rows, 17 fins per inch,
and manufactured using copper tubes with mechanically bonded
aluminum louvered fins. Fin surfaces are coated with Gold-Fin™
corrosion resistant hydrophilic silica gel coating. Coils are pres-
sure tested at a minimum of 551 psig.
Fans & Motors
Units are furnished with two direct-drive propeller fans providing
horizontal airflow from the rear and discharging from the front of
the unit. Fan blades are 20-½ inch diameter, balanced, and made
of durable Lupos (ABS) polymeric resin. Motors are designed to
operate between 430 and 700 RPM in Cooling mode and be-
tween 500 and 750 RPM in Heating mode. Both fans are driven
by digitally-controlled inverters that vary the fan speed. Motors
are brushless, digitally-controlled (BLDC) and have permanently
lubricated and sealed ball bearings. All outdoor unit fans are con-
trolled by an inverter drive mounted near the main microprocessor.
The outdoor unit fan speed is controlled using an algorithm that
provides three pre-programmed fan speeds. DIP switch adjust-
able settings limit night time (off peak) fan speed to reduce fan
generated noise by up to 10 dB(A).
Outdoor Unit Controls
Outdoor units are factory wired with necessary electrical control
components, printed circuit boards, thermistors, sensors, terminal
blocks, and lugs for power wiring. The control wiring circuit is low
voltage and includes a control power transformer, fuses, and inter-
connecting wiring harness with plug connectors. Microprocessor-
based algorithms provide component protection, soft-start capabil-
ity, refrigeration system pressure and temperature control, defrost,