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Equipment Selection Procedure - LG Multi IV Engineering Manual

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LATS Multi V Piping Design Software
The proper design and installation of the refrigerant piping system is a
critical element of a Multi V system. Multi V Heat Pump systems require
two pipes between components – a liquid line and a vapor line. Multi V
Heat Recovery systems require three pipes between the outdoor unit
and the heat recovery unit – a liquid line, a low-pressure vapor line,
and a high-pressure vapor line. A properly designed refrigerant piping
system ensures that refrigerant is delivered to the indoor unit coils for
optimal system performance and capacity.
LG Air Conditioner Technical Solution (LATS) software is a total design
solution for LG Multi V air conditioning systems. This
-based application assists the design engineer with
specifying and sizing outdoor and indoor units (by calculating
component capacity based on design conditions), laying out the refrig-
eration distribution pipe system, checking piping limitations, calculating
refrigerant charge, and generating equipment schedules and piping diagrams in (.dxf) format for use on CAD building design drawings.*
* Windows
is a registered mark of Microsoft
To ensure that the refrigerant piping design meets LG's quality standards, a LATS refrigerant piping design must be provided with
every Multi V order. Following the installation, if any changes or variations to the design are necessary, a new LATS file must be
created and provided to LG prior to system commissioning to ensure the proper pipe size has not changed.
Adjusting LATS Multi V Output for Altitude
When a system is installed at elevations significantly above sea level, consider the impact air density has on the capacity of the indoor and
air-source units. LATS does not de-rate indoor unit capacity for high altitude applications. Be sure to apply locally accepted correction factors
when calculating actual indoor unit capacities at that altitude.
Design Choices
LATS Multi V software is flexible, offering the HVAC system engineer an easy to use Tree mode.
Tree Mode
Using the Tree mode, the engineer can quickly create a one-line schematic drawing of a Multi V system. Integration of the engineered pipe
system into the building drawings is done at a later date by the
draftsperson using standard drafting software tools.
Import building loads from an external file (.xls format).
• System components selected using an easy drag and drop
• Automatically analyzes and checks the design complies with most
piping design limitations.
• Sizes refrigerant piping.
• Generates a system engineering report (.xls format).
• Generates an equipment schedule (.xls or .dxf format).
• Generates a system piping diagram (.dxf format).
LATS Report
LATS Multi V software generates a report file (.xls format) contain-
ing project design parameters, cooling and heating design day
system component performance, and capacity data. The report
calculates the system combination ratio, calculates the system
refrigerant charge, and provides detailed bill of material information
including a list of Multi V outdoor units, air handlers, control devices, accessories, refrigerant pipe sizes segregated by building, by system,
by pipe size, and by pipe segments.
102 |
Figure 10: Screenshot of LATS Pipe System Design Tool in Tree Mode.


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