10 | PRODUCT DATA
MUL
TI V W
ater Mini Unit Engineering Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
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Quiet Operation and Integrated
Controls
Low Sound Levels
LG customers often ask if the unit is running after commissioning is
complete. When Multi V Water Mini units operate fully loaded, they
are one of the quietest levels in the industry. The sound is almost
undetectable during off-peak operation.
All rotating components are soft-started by the controller using a
digitally controlled inverter, which reduces undesirable noise caused
by compressors cycling on and off.
Comfort Control at its Best
Tight temperature control through precise load matching maximizes
the time that the indoor units remove moisture. This ensures
maximum comfort!
Precision Load Matching
Unlike traditional air conditioning control systems that use
thermostatic controls to maintain room temperatures, LG Multi V
controls continuously vary the indoor unit fan speed and
refrigerant flow. The water source unit responds by varying the
compressor speed as needed to meet the indoor unit’s demand. As
a result, the Multi V Water Mini system delivers precise space tem-
perature control without overshooting the set-point. Temperature drift
in the thermal zone is minimized, because the fan speed and
refrigerant volume are controlled together precisely matching the
load.
Advanced Compressor Technology
Oil Management
The oil injection mechanism ensures a reliable oil film on moving
parts even at the lowest speeds, which enables the inverter
compressor to safely operate at speeds as low as 30 Hz. The
following oil return system brings oil back to the compressor once
the oil leaves the compressor, so oil migration is no longer a
concern.
1. The compressor discharge is specially designed to minimize the
amount of oil leaving the compressor.
2. Oil return algorithms flush the oil from the system back to the
compressor.
Inverter Driven
The rotary compressor is optimized around the R410A model to
maximize compressor efficiency, which reduces power consumption
and lowers utility bills. The latest inverter technology allows the LG
Multi V Water Mini to precisely match the load, which prevents
constant cycling and results in tight temperature control and opti-
mized efficiency. Occupants remain comfortable while utility costs
are reduced.
Simplified Installation
Cooling and heating systems that use the LG Multi V Water Mini
simplify and reduce the mechanical and control system design time.
The designer no longer has to be concerned with interconnecting
chilled water piping or air distribution duct systems, or matching and
selecting chillers, fans, air handlers, or Variable Air Volume (VAV)
boxes.
System integration with existing building management systems
(based on BACnet
®
or LonWorks
®
) has never been easier. Because
all of the Multi V Water Mini system components are engineered and
provided by LG, the system components and controls come pre-
engineered and do not need any custom programming from third-
party contractors.
Operating Range and Size
Operating Range (4�4 Tons)
The water source unit can operate from 23°F–113°F entering water
temperature in cooling mode, and 23°F–113°F entering water
temperature in heating mode (if entering water temperature falls
below 42°F, glycol must be added to the system). Variable water flow
control kit [PRVC1] required for all entering water temperatures; one
kit per frame. The connected indoor unit combination ratio range is
30%–130%.
Compact Size
Water Mini units have a 20-5/8″ H x 13-1/8″ W cabinet. Multiple units
can be stacked using an independent racking system, giving back
valuable floor space.
PRODUCT FEATURES AND BENEFITS
Multi V™ Water Mini Units
Entering water temperatures below 42 require ...WIL MEN-
TION glycol here. SEE OTHER SECTIONS FOR TEXT. see
page 45.
