LG Multi V mini Engineering Manual page 95

MECHANICAL SPECIFICATIONS
VRF Multi V™ Mini Air Source Units—ARUN 036, 047, 053
and ambient control. The unit is designed to provide continuous
compressor operation from -4°F to 118°F. When the system is
started, the connected indoor units are automatically assigned an
electronic address by the outdoor unit's microprocessor. Addition-
ally, each indoor unit is capable of accepting a manual assignment
of a secondary electronic address that, if used, provides unit tag
identification when integrating with LG VNet control devices. While
operating in the Heating mode, the outdoor unit has a demand-
based defrost control algorithm and a refrigeration system pump-
down cycle designed to store up to 6.6 lbs of the system refrigerant
charge in the outdoor unit. In Heating mode, a cooperative-control
algorithm automatically balances, in real-time, the distribution of
refrigerant to the indoor units when the system's refrigerant mass
flow is insufficient to satisfy the demand of all indoor units when the
system is called on to operate outside the system design param-
eters. In 10-second intervals, the outdoor unit microprocessor will
record the last three minutes of system run-time data in non-volatile
memory. Upon unit malfunction, or a power outage that results in
a system shutdown, the stored system operational data may be re-
trieved and analyzed to assist in diagnosing a system malfunction.
The outdoor unit microprocessor is provided with a three-digit, LED
display that communicates active system information and/or mal-
function codes. The microprocessor has an algorithm that actively
verifies the operational condition of system sensors and thermis-
tors. A refrigerant auto-trim-charge algorithm assists the installer
with properly charging the system. A power conditioning circuit is
provided and designed to protect the unit's inverter compressor and
outdoor unit fan motors from phase failure, phase reversal, sense
an under-voltage or over-voltage condition, and to prevent trans-
mission of power irregularities to the supply power source. A snow
throw algorithm is provided designed to reduce snow buildup on the
discharge side louvers grille at regular intervals.
Due to our policy of continuous product innovation, some specifications may change without notification.
SPECIFICATIONS 97
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