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Multi V Iv Heat Pump And Heat Recovery Outdoor Units; Mechanical Specifications; Refrigerant System - LG Multi IV Engineering Manual

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MECHANICAL SPECIFICATIONS

VRF Multi V IV Outdoor Units
Multi V IV Outdoor Units
General
LG Multi V IV Variable Refrigerant Flow
(VRF) comprises of a Heat Pump system or
a Heat Recovery System with a single, dual
or triple frame outdoor unit connected to
indoor units or heat recovery units (for heat
recovery systems only) with a single refriger-
ant piping system connectable using factory
designed and supplied Y-branches and
Headers, and having integrated controls.
An LG Multi V IV Heat pump system is a
VRF system that can operate in either cool-
ing or heating mode, whereas an LG Multi V
IV Heat Recovery system is a VRF system
that can operate with its indoor units in
different modes (heating or cooling) simulta-
neously. The Heat Recovery unit is capable
of being designed for minimum piping and
maximum design flexibility. Individual indoor
units or zones can change modes (cooling to
heating or heating to cooling).
LG components are manufactured in a facil-
ity registered to ISO 9001 and ISO 14001,
which is a set of standards applying to envi-
ronmental protection set by the International
Organization for Standardization (ISO). The
units are listed by Intertek Electrical Testing
Laboratories (ETL) and bear the ETL label.
Wiring in these units are in accordance with
the National Electrical Code (NEC).
Temperature Ranges
Heat Pump Systems
Air-cooled heat pump systems can operate
continuously in outdoor ambient conditions
while in heating mode from -13.0°F to 61°F
and in cooling mode from 14°F to 122°F.
Beyond these continuous operating ranges,
heating or cooling can be delivered but
cycling may occur. (When the optional low
ambient cooling baffle [sold separately] has
been installed, system minimum cooling op-
eration range is extended [-9.9°F to 122°F]).
Heat Recovery Systems
Air-cooled heat recovery systems can oper-
ate with continuous compressor operation in
outdoor ambient conditions while all indoor
units are in heating mode from -13.0°F to
61°F; with some indoor units in cooling and
some in heating from 14°F to 61°F; and
when all indoor units are in cooling mode
from 14°F1 to 122°F. Beyond these continu-
8 | PRODUCT DATA
ous operating ranges, heating or cooling can
be delivered but cycling may occur. (When
the optional low ambient cooling baffle [sold
separately] has been installed, system mini-
mum cooling operation range is extended
[9.9°F to 122°F]) when all indoor units are in
cooling mode.
Casing / Frame
Heat Pump and Heat Recovery outdoor
units are constructed with galvanized steel,
bonderized and finished with a baked
enamel paint. Each frame has a removable
inspection panel to allow access to service
tool connection, DIP switches, auto address-
ing, and error code display without removing
the entire front panel. The entire front panel
of the outdoor unit is removable for mainte-
nance.
Outdoor unit frames are completely factory
assembled, piped and wired. Dual and triple
frame outdoor units need to be field piped
with factory designed and supplied Y-branch
kits to manifold them together into a single
refrigerant circuit.

Refrigerant System

The refrigeration system consists of a single
refrigeration circuit and uses R410A refriger-
ant. The outdoor unit is provided with factory
installed components, including a refrigerant
strainer, check valves, oil separator, accu-
mulator, four-way reversing valve, electronic
controlled expansion valve (EEV), high
and low side charging ports, high pressure
safety switch, service valves, and intercon-
necting piping. Also included is an integral
subcooler assembly consisting of a double
spiral tube-type subcooling heat exchanger
and EEV providing refrigerant subcooling
modulation up to 23ºF.
Refrigeration Oil Control
Oil return system utilizes the following
technologies:
HiPOR™ (High Pressure Oil Return)
Oil is captured from compressor discharge
by the centrifugal oil separator and then
returned to the compressor through a sepa-
rator oil injection pipe, preventing mixing of
oil and refrigerant on the suction side of the
compressor.
©
Smart Oil Control
Monitors the oil level inside the compressor
and only initiates oil return cycle to flush
oil in pipe system back to the compressor,
when the oil level is too low. Timed oil return
cycles are not necessary and compressor is
protected from running at oil levels that are
too low.
Compressors
are equipped with one hermetic digitally
controlled inverter driven scroll compressor
to modulated capacity (variable from 15 to
150Hz, modulate in 0.5Hz increments). All 3
nal capacity are equipped with two digitally
controlled inverter-driven hermetic scroll
compressors to modulated capacity (variable
from 15 to 150Hz. An internal thermal over-
load and a factory-mounted 60 watt crank-
case heater is included on all compressors.
Outdoor Unit Coil
Heat Pump and Heat Recovery outdoor
unit coils are of a nonferrous construction
with louvered aluminum fins on copper
tubing, and are protected with an integral
metal guard. Coil fins have a factory applied
corrosion resistant GoldFin™ material with
hydrophilic coating.
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