LG Multi V Water V ARWM072CAS5 Installation and operation manual

ENGINEERING MANUAL
Variable Refrigerant Flow Water
Source Outdoor Units
6.0 to 48.0 Tons

For continual product development, LG Electronics Canada Inc. reserves the right to change specifications without notice.
© LG Electronics Canada Inc.
This document, as well as all reports, illustrations, data, information,
and other materials are the property of LG Electronics Canada, Inc., and are
disclosed by LG Electronics Canada, Inc. only in confidence.
This document is for design purposes only.
A summary list of safety precautions is on page 3.
To access additional technical documentation such as submittals, indoor
unit engineering manuals, installation, service, product data performance,
general best practice, and building ventilation manuals, as well as white
papers, catalogs, LATS software programs, and more, visit www.lgvrf.ca.
TABLE OF CONTENTS
TABLE OF SYMBOLS
PROPRIETARY DATA NOTICE
DANGER
This symbol indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.
WARNING
This symbol indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.
CAUTION
This symbol indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury.
This symbol indicates situations that may result in equipment or property damage accidents only.
This symbol indicates an action that must not be performed.
Unit Nomenclature........................................................................................................................................................................................ 4
LG Air Conditioner Technical Solution (LATS).........................................................................................................................................5-6
Refrigerant Charge Worksheet..................................................................................................................................................................... 7
Water Source Unit Product Data .............................................................................................................................................................8-66
Mechanical Specifications...................................................................................................................................................................... 9-10
Product Features and Benefits............................................................................................................................................................. 11-12
General Data ....................................................................................................................................................................................... 13-15
Electrical Data .......................................................................................................................................................................................... 16
Connection Limitations.............................................................................................................................................................................. 17
Dimensions.......................................................................................................................................................................................... 18-20
Wiring Diagrams ....................................................................................................................................................................................... 21
Refrigerant Flow Diagrams................................................................................................................................................................... 22-29
Acoustic Data ...................................................................................................................................................................................... 30-32
Head Loss by Water Flow ......................................................................................................................................................................... 33
Accessories ......................................................................................................................................................................................... 34-40
Electrical Connections .......................................................................................................................................................................... 41-44
System for Heat Pump Configuration ........................................................................................................................................................ 42
System for Heat Recovery Configuration................................................................................................................................................... 43
DIP Switch Settings For Use With Gen 4 Indoor Units............................................................................................................................... 44
Water Loop Circuit Design .................................................................................................................................................................... 45-57
Water Design Guide............................................................................................................................................................................. 46-49
Water Circuit Installation ...................................................................................................................................................................... 50-57
Piping Limitations and Placement Considerations.............................................................................................................................. 58-74
Piping Limitations................................................................................................................................................................................. 59-68
Refrigerant Piping for Separated Water Source Units........................................................................................................................... 69-70
Placement Considerations for Water Source Unit(s)...................................................................................................................................71
Transporting / Lifting Water Source Unit(s).................................................................................................................................................72
Installation Considerations................................................................................................................................................................... 73-74

4 | INTRODUCTION INTRODUCTION |5
Introduction
MULTI V Water V Water Source Unit Engineering Manual
© LG Electronics Canada, Inc., North York, ON Canada. All rights reserved. “LG” is a registered trademark of LG Corp. © LG Electronics Canada, Inc., North York, ON Canada. All rights reserved. “LG” is a registered trademark of LG Corp.
Water Source Units
ARW M072 C A S
Generation
5 = Fifth
Airflow Configuration
A = Not Applicable
T = Top Discharge
Electrical Ratings
C = 575V/60Hz/3Phase
Capacity (Mbh)
Type
M = Inverter Heat Pump & Heat Recovery
Family
ARW = MULTI V Water V Water Source Unit (Refrigerant R410A)
5
System Efficiency
E = High Efficiency
S = Standard Efficiency
072 = 72
096 = 96
121 = 120
144 = 144
192 = 192
240 = 240
288, 289 = 288
336, 337 = 336
432 = 432
480 = 480
576 = 576
UNIT NOMENCLATURE
LG Air Conditioner Technical Solution (LATS) Software
A properly designed and installed refrigerant piping system is critical to the optimal performance of LG air-conditioning systems. To assist
engineers, LG offers, free of charge, LG Air Conditioner Technical Solution (LATS) software—a total design solution for LG air conditioning
systems.
To reduce the risk of designing an improper applied system or one that will not operate correctly, LG requires that LATS software be used on all
projects.
Formats
LATS is available to LG customers in three user interfaces: LATS HVAC, LATS CAD2, and LATS REVIT. All three LATS formats are available
through an LG Sales Representative.
LATS HVAC is a Windows®-based application that aids engineers in designing LG Variable Refrigerant Flow (VRF), Multi F / Multi F MAX,
Single-Zone, and Energy Recovery Ventilator (ERV) systems.
*Windows®is a registered mark of Microsoft®Corporation.
LATS CAD2 combines the LG LATS program with AutoCAD®
software**. It permits engineers to layout and validate LG Multi V
Variable Refrigerant Flow (VRF), Multi F / Multi F MAX, Single-Zone,
and Energy Recovery Ventilator (ERV) systems directly into CAD
drawings.
LATS Revit integrates the LG LATS program with Revit®software**.
It permits engineers to layout and validate Multi V VRF systems
directly into Revit drawings.
**AutoCAD®and Revit®are both registered marks of Autodesk, Inc.
Features
All LG product design criteria have been loaded into the program,
making LATS simple to use: double click or drag and drop the com-
ponent choices. Build systems in Tree Mode where the refrigerant
system can be viewed. Switch to a Schematic diagram to see the electrical and communications wiring.
LATS software permits the user to input region data, indoor and outdoor design temperatures, modify humidity default values, zoning, specify
type and size of outdoor units and indoor units, and input air flow and external static pressure (ESP) for ducted indoor units.
The program can also do the following:
LG AIR CONDITIONER
TECHNICAL SOLUTION (LATS)
• Import building loads from a separate Excel file.
• Present options for outdoor unit auto selection.
• Automatically calculate component capacity based on design
conditions for the chosen region.
• Verify if the height differences between the various system
components are within system limits.
• Provide the correct size of each refrigerant piping segment and LG
Y-Branches and Headers.
• Adjust overall piping system length when elbows are added.
• Check for component piping limitations and flag if any parameters
are broken.
• Factor operation and capacity for defrost operation.
• Calculate refrigerant charge, noting any additional trim charge.
• Suggest accessories for indoor units and outdoor units.
• Run system simulation.
Features depend on which LATS program is being used, and the type of system being designed.
Figure 1: Example of LATS CAD2.
For Heat Recovery Unit information, refer to the applicable Engineering Manual on www.lgvrf.ca

6 | INTRODUCTION INTRODUCTION |7
Introduction
MULTI V Water V Water Source Unit Engineering Manual
© LG Electronics Canada, Inc., North York, ON Canada. All rights reserved. “LG” is a registered trademark of LG Corp. © LG Electronics Canada, Inc., North York, ON Canada. All rights reserved. “LG” is a registered trademark of LG Corp.
LATS Generates a Complete Project Report
LATS software also generates a report containing project design parameters, cooling and heating design data, system component perfor-
mance, and capacity data. The report includes system combination ratio and refrigerant charge calculations; and provides detailed bill of
material, including outdoor units, indoor units, control devices, accessories, refrigerant pipe sizes segregated by building, by system, by pipe
size, and by pipe segments. LATS can generate an Excel GERP report that can imported into the LG SOPS pricing and ordering system.
Proper Design to Install Procedure
LG encourages a two report design-to-install-procedure. After the design engineer determines building / zone loads and other details, the
engineer opens the LATS program and inputs the project’s information. When the design is complete, the “Auto Piping” and “System Check”
functions must be used to verify piping sizes, limitations, and if any design errors are present. If errors are found, engineers must adjust the
design, and run Auto Piping and System Check again. When the design passes the checks, then the engineer prints out a project “Shop
Drawing” (LATS Tree Diagram) and provides it to the installing contractor. The contractor must follow the LATS Tree Diagram when building
the piping system, but oftentimes the design changes on the building site:
• Architect has changed location and/or purpose of room(s).
• Outdoor unit cannot be placed where originally intended.
• Structural elements prevent routing the piping as planned.
• Air conditioning system conflicts with other building systems (plumbing, gas lines, etc.).
The contractor must mark any deviation from the design on the Shop Drawing, including as-built straight lines and elbows. This “Mark Up”
drawing must be returned to the design engineer or Rep, who must input contractor changes into the LATS file. (Copy the original LATS soft-
ware file, save and rename as a separate file, and modify all piping lengths by double-clicking on each length and editing information.) Like
the shop drawing, the Auto Piping and System Check must also be run on this new “As Built” drawing. The design engineer or Rep must then
provide the final As Built file to the contractor. The Mark Up version must be compared to the As Built version for:
• Differences in pipe diameter(s). If incorrect diameters have been installed, the piping must be changed out. If pipe diameters have changed,
check to see if Y-Branches will also need to be changed.
• Changes to outdoor unit and indoor unit capacities. Capacities changes may impact line length changes.
• Additional refrigerant charge quantity (“Trim Charge”). Trim charge will change if piping lengths and diameters change. The As Built version
must reflect installed piping lengths to ensure correct trim charge.
All documents submitted by the contractor, as well as the Shop Drawing and the As Built Drawing files must be provided for commissioning
purposes. Model and serial numbers for all system components must also be submitted. If the steps previously detailed are not followed,
and all documents are not provided to the commissioning agent, the project runs the risk of not being commissioned and voiding any limited
warranty LG offers on the equipment.
LG AIR CONDITIONER
TECHNICAL SOLUTION (LATS) System R410A Refrigerant Charge Calculator (lbs.)
REFRIGERANT CHARGE WORKSHEET
1CF (Ref.) = Correction Factor for Refrigerant Charge. 2For refrigerant charge purposes, consider only the liquid line; ignore the vapor line(s).
System Tag or ID:
Job Name: __________________________________________
Project Manager: ____________________________________ Date: ______________
Line # Description Chassis I.D. Size Quantity CF (Ref.)1Total (lbs.)
1 Linear feet of 1/4" liquid line tubing2—— 0.015
2 Linear feet of 3/8" liquid line tubing2—— 0.041
3 Linear feet of 1/2" liquid line tubing2—— 0.079
4 Linear feet of 5/8" liquid line tubing2—— 0.116
5 Linear feet of 3/4" liquid line tubing2—— 0.179
6 Linear feet of 7/8" liquid line tubing2—— 0.238
7 Linear feet of 1" liquid line tubing2—— 0.323
8 Standard + Art Cool Mirror SJ, SK 5k to 15k 0.53
9 Standard + Art Cool Mirror SJ, SK 18k to 24k 0.62
10 Standard SV 30k to 36k 1.01
11 Art Cool Gallery SF 9k to 12k 0.22
12 1-Way Cassette TU 7k to 12k 0.44
13 1-Way Cassette TT 18k to 24k 0.64
14 2-Way Cassette TS 18k to 24k 0.75
15 4-Way 2' x 2' Cassette TR 5k to 7k 0.40
16 4-Way 2' x 2' Cassette TR 9k to 12k 0.55
17 4-Way 2' x 2' Cassette TQ 15k to 18k 0.71
18 4-Way 3' x 3' Cassette TN 7k to 24k 0.88
19 4-Way 3' x 3' Cassette TM 28k to 36k 1.08
20 4-Way 3’ x 3’ Cassette TM 42k to 48k 1.41
21 High Static Ducted M1 7k to 24k 0.57
22 High Static Ducted M2 7k to 24k 0.77
23 High Static Ducted M2 28k to 42k 1.15
24 High Static Ducted M3 28k to 54k 1.35
25 High Static Ducted B8 36k to 96k 2.20
26 Low Static Ducted, Low Static Ducted Bottom Return L1 5k to 9k 0.31
27 Low Static Ducted, Low Static Ducted Bottom Return L2 12k to 18k 0.42
28 Low Static Ducted, Low Static Ducted Bottom Return L3 21k to 24k 0.55
29 Vertical / Horizontal Air Handling Unit NJ 12k to 30k 1.04
30 Vertical / Horizontal Air Handling Unit NJ 36k 1.57
31 Vertical / Horizontal Air Handling Unit NK 42k to 54k 2.00
32 Floor Standing CE (U) 7k to 15k 0.37
33 Floor Standing CF (U) 18k to 24k 0.82
34 HRU: PRHR022A/023A, 032A/033A, 042A/043A, 063A, 083A —— 1.1
35 TOTAL SYSTEM CHARGE
Figure 2: Example of LATS Tree Diagram

WSU PRODUCT DATA | 9
Water Source Unit Product Data
© LG Electronics Canada, Inc., North York, ON Canada. All rights reserved. “LG” is a registered trademark of LG Corp.
WATER SOURCE
UNIT PRODUCT
DATA
Mechanical Specifications on page 9
Product Features and Benefits on page 11
General Data on page 13
Electrical Data on page 16
Connection Limitations on page 17
Dimensions on page 18
Wiring Diagrams on page 21
Refrigerant Flow Diagrams on page 22
Acoustic Data on page 30
Head Loss by Water Flow on page 33
Accessories on page 34
MECHANICAL SPECIFICATIONS
General
An LG Multi V Water V 575V variable refrigerant flow (VRF) water source unit (WSU) oper-
ates as a Heat Pump system or a Heat Recovery System. Single, dual, or triple frame outdoor
unit combinations are connected to indoor units with a single refrigerant piping system using
factory designed and supplied Y-branches, Headers, and/or Heat Recovery Units and have
integrated controls.
The system is capable of being designed for minimum piping and maximum design flexibility.
Each Heat Recovery Unit piping port is independently capable of operating in either heating
or cooling mode regardless of the mode of other piping ports on the same heat recovery unit
or in the system. The Heat Recovery Unit is capable of changing mode of individual indoor
units or zones (cooling to heating or heating to cooling) within a maximum time frame of three
(3) minutes to ensure indoor temperature can be properly maintained.
LG components are manufactured in a facility meeting International Organization for Stan-
dardization (ISO) 9001 and ISO 14001 standards. ISO 9001 defines quality management and
ISO 14001 defines environmental management. 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 Configuration
In Heat Pump conguration, the system can operate in heating only mode with an entering water
temperature (EWT) of 14°F to +113°F. Heat pump units can operate in cooling only mode with an
EWT of 23°F to +113°F.
Heat Recovery Configuration
In Heat Recovery conguration, the system can operate in heating only mode with an entering water temperature (EWT) of 14°F to +113°F. Heat
recovery units can operate in cooling only mode with an EWT of 23°F to +113°F.
Casing / Frame
Multi V Water V 575V units are constructed with galvanized steel, bonderized and finished with powder coat baked enamel paint. Each frame
has a removable inspection panel to allow access to service tool connection, DIP switches, auto addressing, and error code display without
removing the entire front panel. The entire front panel of the WSU is removable for maintenance.
WSU frames are completely factory assembled, piped and wired. Dual and triple frame WSUs must 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 is a single refrigeration circuit using R410A refrigerant. The WSU is provided with factory-installed components
including a refrigerant strainer, check valves, oil separator, accumulator, hot gas bypass valve, four-way reversing valve, electronic con-
trolled expansion valve (EEV), high and low side charging ports, high pressure safety switch, service valves, and interconnecting 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 25ºF.
Multi V Water V 575V Water Source Outdoor Units
Figure 3: Single-Frame Multi V Water V 575V
Water Source Unit.

10 |WSU PRODUCT DATA WSU PRODUCT DATA | 11
Water Source Unit Product Data
MULTI V Water V Water Source Unit Engineering Manual
© LG Electronics Canada, Inc., North York, ON Canada. All rights reserved. “LG” is a registered trademark of LG Corp. © LG Electronics Canada, Inc., North York, ON Canada. All rights reserved. “LG” is a registered trademark of LG Corp.
MECHANICAL SPECIFICATIONS
Refrigeration Oil Control
The oil return system uses the following technologies:
High Pressure Oil Return (HiPOR)
Oil is captured from compressor discharge by the centrifugal
oil separator and then returned to the compressor through
a separator oil injection pipe, preventing mixing of oil and
refrigerant on the suction side of the compressor.
Smart Oil Control
Smart oil control monitors the oil level inside the compressor
and initiates an oil return cycle to flush oil in the pipe system
back to the compressor only when the oil level is too low.
Timed oil return cycles are not necessary and the compressor
is protected from operating at oil levels that are too low.
Compressors
Each WSU frame is equipped with one hermetic, digitally-con-
trolled, inverter-driven scroll compressor to modulate capacity
(variable from 20 to 140Hz. The compressor has a built-in oil
level sensor to provide real-time oil control.
Heat Exchanger
The water heat exchanger is a stainless steel, type SUS316, refrigerant/water plate heat exchanger. The heat exchanger requires a
field-provided 50 mesh strainer and water treatment to prevent scaling inside the heat exchanger. Closed loop condenser water systems are
recommended to protect the factory-mounted heat exchanger.
Electrical
Multi V Water V 575V units are available in 575V, 60Hz, 3 Phase input power supply. All WSUs are capable of operating within voltage limits
of ±10% rated voltage, and include overcurrent protection.
Controls
Multi V Water V 575V units are factory wired with the necessary electrical control components, integral microprocessors, printed circuit
boards, thermistors, sensors, terminal blocks, and power lugs.
The control circuit between the indoor units, heat recovery units (Heat Recovery configuration only) and the WSU is an RS-485 daisy chain
communication bus. The cable is two conductor, stranded and shielded, 18 AWG.
Microprocessor-based algorithms provide component protection, soft-start capability, refrigeration system pressure and temperature control.
The variable water flow control kit allows condenser water temperatures below 59°F and works with condenser water pumps equipped with
variable frequency drive to save pumping energy.
For Heat Recovery Unit information, refer to the applicable Engineering Manual on www.lgvrf.ca
MULTI V Water V Water Source Outdoor Units
Figure 4: Dual Frame MULTI V Water V Water Source Unit. Multi V Water V 575V
Multi V Water V 575V water source units (WSU), equipped with an inverter compressor, offer superior load matching and long piping instal-
lation. The product optimizes power consumption in high-rise buildings. Add on features make it easy to upgrade the existing capacity at any
time. Sophisticated electronic control and unique refrigerant flow gives these systems the capability to perform in extreme/unusual working
conditions.
Generation 4 Equipment
The latest versions of LG’s indoor units and water source units are designated Generation 4 (Gen 4). For Gen 4 units to operate with Gen 4
features, the air conditioning system must meet the following requirements:
• All indoor units, heat recovery units, and water source units must be Gen 4.
• All water source units must have Gen 5 software installed.
• Water source units DIP switch 3 must be set to ON (factory default setting is OFF).
• All controllers must support Gen 4 features.
Low Sound Levels
When Multi V Water V 575V water source units operate fully loaded, they have one of the quietest sound levels in the industry. Sound is
almost undetectable during off-peak operation. To promote a quiet, comfortable environment, LG Multi V water source units operate at sound
levels as low as 47 dB(A) in cooling mode and 51 dB(A) in heating mode. LG customers often ask if the water source unit is running after
commissioning is complete.
All rotating components are soft-started by the controller using digitally controlled inverters, 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 and delivers the industry’s best indoor humidity levels.
Precision Load Matching
Unlike traditional air conditioning control systems, which use thermostatic controls to maintain room temperatures, LG Multi V Water V 575V controls
continuously vary the indoor unit fan speed and refrigerant ow, indirectly providing lower and more consistent humidity levels in the conditioned space.
The longer the indoor coil temperature is below the dew-point of the room with air moving across the coil, the less the space humidity level varies,
compared to technologies that cycle fans and compressors on and off multiple times per hour.
The water source unit varies the compressor speed as needed to maintain system operating pressure. As a result, the Multi V Water V 575V
system delivers precise space temperature control.
Advanced Compressor Technology
Oil Management
Oil migration is no longer a concern when choosing Multi V Water V 575V. An oil management system ensures a safe level of oil in the com-
pressor sump.
1. Smart oil system monitors oil sump levels to know when to inject oil into the compressor, eliminating the need for oil return cycles.
2. HiPOR™ oil return system minimizes oil mixing with refrigerant by separating oil at compressor discharge with an oil separator and
injecting oil back to the lower section of the compressor shell. Energy is saved by compressing the refrigerant without the oil mixed at the
compression chamber.
3. Oil injection system provides a consistent film of oil to moving parts, even at low speeds, ensuring compressor operation down to 20 Hz.
Inverter Driven
The scroll compressor is optimized to maximize compressor efficiency, which reduces power consumption and monthly utility bills. This
latest inverter technology allows the LG Multi V Water V 575V to vary the compressor motor shaft speed to deliver an appropriate amount of
cooling to all indoor units. Precise refrigerant volume delivery translates into long periods with coil surface temperatures below dew point and
minimizes compressor component run time. Occupants remain comfortable while utility costs are reduced.
PRODUCT FEATURES AND BENEFITS
MULTI V Water V Water Source Outdoor Units

12 |WSU PRODUCT DATA WSU PRODUCT DATA | 13
Water Source Unit Product Data
MULTI V Water V Water Source Unit Engineering Manual
© LG Electronics Canada, Inc., North York, ON Canada. All rights reserved. “LG” is a registered trademark of LG Corp. © LG Electronics Canada, Inc., North York, ON Canada. All rights reserved. “LG” is a registered trademark of LG Corp.
Simplified Installation
Cooling and heating systems that use the
LG MULTI V Water V simplify and reduce the mechanical and control system design time. The designer no longer has to be concerned with
interconnecting chilled and condenser water piping, air-distribution duct systems, matching and selecting chillers, towers, pumps, coils, fans,
air handlers, or Variable Air Volume (VAV) boxes.
System integration with existing building management systems has never been easier. Because all of the MULTI V Water V system compo-
nents are engineered and provided by LG, the system components and controls come pre-engineered and do not need custom programming
from third-party contractors.
Operating Range
The MULTI V Water V product line includes capacities from six (6.0) to forty-eight (48.0) tons, and features a connected indoor unit combina-
tion ratio of 50% to 130%. Operating ranges include:
Entering Water Temperatures
• 23–113 °F for cooling mode
• 14–113 °F for heating mode
• 23–113 °F for synchronous mode (heat recovery systems only)
Compact Size
All Multi V Water V 575V water source unit frames have the same physical footprint: 30-3/8” wide by 21-1/2” deep. Systems can be designed
with one, two, or a maximum of three water source unit frames.
Other Features
• Inverter Scroll Compressors
• Elevation Advantage
• Smaller Footprint
• Precision Load Matching
• AHRI 1230 Certification
PRODUCT FEATURES AND BENEFITS
MULTI V Water V Water Source Outdoor Units
Figure 5: Triple Frame MULTI V Water V Water Source Unit.
Table 1: Multi V Water V 575V Units
Combination Unit Model Number 6.0 Ton
ARWM072CAS5
8.0 Ton
ARWM096CAS5
10.0 Ton
ARWM021CAS5
12.0
ARWM144CAS5
16.0 Ton
ARWM192CAS5
Individual Component Model Numbers – – – – –
Cooling Performance
Nominal Cooling Capacity (Btu/h)172,000 96,000 119,700 144,000 192,000
Heating Performance
Nominal Heating Capacity (Btu/h)181,000 108,000 135,000 162,000 216,000
Operating Range (Entering Water Temperature)
Cooling (°F)223 – 113 23 – 113 23 – 113 23 – 113 23 – 113
Heating (°F) 14 – 113 14 – 113 14 – 113 14 – 113 14 – 113
Synchronous Operation (°F) 23 – 113 23 – 113 23 – 113 23 – 113 23 – 113
Compressor
Inverter Quantity
HSS DC Scroll x 1
Oil/Type PVE/FVC68D
Unit Data
Refrigerant Type R410A
R410A Refrigerant Factory Charge (lbs) 9.9 9.9 9.9 9.9 9.9
Refrigerant Control/Location EEV/Indoor Unit
Max. Number Indoor Units/System213 16 20 23 32
Sound Press dB(A)3 Cooling/Heating 46 48 54 54 58
Net Unit Weight (lbs.) 348 348 348 348 348
Shipping Weight (lbs.) 370 370 370 370 370
Communication Cables5,6 2 x 18 AWG
Heat Exchanger (Stainless Steel Plate)
Maximum Pressure Resistance (psi) 640 640 640 640 640
Flow at Rated Condition (GPM) 20.3 25.4 30.4 35.5 50.7
Range of Flow (GPM) 10.2 – 30.5 12.7 – 38.1 15.2 – 45.6 17.8 – 53.3 25.4 – 76.1
Total Heat of Rejection (Btu/h) 94,100 125,900 157,900 190,100 253,500
Total Heat of Absorption (Btu/h) 74,200 98,600 122,700 146,800 193,600
Pressure Drop (ft-wg) 2.34 3.51 4.94 6.50 12.61
Δt4(°F) 9.3 9.9 10.4 10.7 10.0
Piping for Heat Recovery Operation7
Liquid Line Connection (in., OD) 3/8 Braze 3/8 Braze 1/2 Braze 1/2 Braze 5/8 Braze
Low Press Vapor Line Conn (in., OD) 3/4 Braze 7/8 Braze 1-1/8 Braze 1-1/8 Braze 1-1/8 Braze
High Press Vapor Line Conn (in., OD) 5/8 Braze 3/4 Braze 3/4 Braze 7/8 Braze 1-1/8 Braze
Piping for Heat Pump Operation7
Liquid Line Connection (in., OD) 3/8 Braze 3/8 Braze 1/2 Braze 1/2 Braze 5/8 Braze
Low Pressure Vapor Line Conn (in., OD) 3/4 Braze 7/8 Braze 1-1/8 Braze 1-1/8 Braze 1-1/8 Braze
Piping for Water7
Water Inlet/Outlet Connection (in) 1-1/2 Fem 1-1/2 Fem 1-1/2 Fem 1-1/2 Fem 1-1/2 Fem
Condensate Drain (in) 3/4 Female 3/4 Female 3/4 Female 3/4 Female 3/4 Female
Multi V Water V 575V Unit Specications
GENERAL DATA
1 Rated capacity is certified under AHRI Standard 1230. Ratings are subject to change without notice. Current certified ratings are
available at www.ahridirectory.org.
2 When entering water temperature is lower than 59ºF, variable water flow control kit PWFCKN000 is required.
3 Sound pressure levels are tested in an anechoic chamber under ISO 3745 standard.
4 Value is calculated as follows: Δt = Total Heat of Rejection/(Nominal Flow Rate x 500).
5 Communication cable between Master ODU to Slave ODU(s), and Master ODU to IDUs / HRUs to be 18 AWG, 2-conductor,
twisted, stranded, shielded. Ensure the communication cable shield is properly grounded to the Master ODU chassis only.
Do not ground the ODU to IDUs / HRUs communication cable at any other point. Wiring must comply with all applicable local and
national codes.
6 Power wiring is field provided, solid or stranded, and must comply with the applicable local and national codes.
7 LG requires that LATS software be used on all projects to ensure correct line sizing. Designer must verify the shop drawing design
against the as built design using LATS. Contractor must also use LG manufactured Y-Branch and Header Kits only.

14 |WSU PRODUCT DATA WSU PRODUCT DATA | 15
Water Source Unit Product Data
MULTI V Water V Water Source Unit Engineering Manual
© LG Electronics Canada, Inc., North York, ON Canada. All rights reserved. “LG” is a registered trademark of LG Corp. © LG Electronics Canada, Inc., North York, ON Canada. All rights reserved. “LG” is a registered trademark of LG Corp.
Table 2: Multi V Water V 575V Units
Combination Unit Model Number 20.0
ARWM240CAS5
24.0
ARWM288CAS5
28.0 Ton
ARWM336CAS5
Individual Component Model Numbers ARWM096CAS5 x 1
ARWM144CAS5 x 1 ARWM144CAS5 x 2 ARWM144CAS5 +
ARWM192CAS5
Cooling Performance
Nominal Cooling Capacity (Btu/h)1239,400 287,700 336,000
Heating Performance
Nominal Heating Capacity (Btu/h)1269,000 324,000 378,000
Operating Range (Entering Water Temperature)
Cooling (°F)223 – 113 23 – 113 23 – 113
Heating (°F) 14 – 113 14 – 113 14 – 113
Synchronous Operation (°F) 23 – 113 23 – 113 23 – 113
Compressor
Inverter Quantity HSS DC Scroll x 2
Oil/Type PVE/FVC68D
Unit Data
Refrigerant Type R410A
R410A Refrigerant Factory Charge (lbs) 9.9 + 9.9 9.9 + 9.9 9.9 + 9.9
Refrigerant Control/Location EEV/Indoor Unit
Max. Number Indoor Units/System239 45 55
Sound Pressure dB(A)3 Cooling/Heating 55 57 59
Net Unit Weight (lbs.) 348 + 348 348 + 348 348 + 348 309 + 309
Shipping Weight (lbs.) 370 + 370 370 + 370 370 + 370
Communication Cables5,6 2 x 18 AWG
Heat Exchanger (Stainless Steel Plate)
Maximum Pressure Resistance (psi) 640 640 640
Flow at Rated Condition (GPM) 25.4 + 35.5 35.5 + 35.5 35.5 + 50.7
Range of Flow (GPM) 30.5 – 91.4 35.5 - 106.5 43.1 - 129.3
Total Heat of Rejection (Btu/h) 316,000 380,200 443,600
Total Heat of Absorption (Btu/h) 245,400 293,600 340,400
Pressure Drop (ft-wg) 3.51 + 6.50 6.50 + 6.50 6.50 + 12.61
Δt4(°F) 10.4 10.7 10.3
Piping for Heat Recovery Operation7
Liquid Line Connection (in., OD) 3/8 + 1/2 Braze 1/2 + 1/2 Braze 1/2 + 5/8 Braze
Low Pressure Vapor Line Conn (in., OD) 7/8 + 1-1/8 Braze 1-1/8 + 1-1/8 Braze 1-1/8 + 1-1/8 Braze
High Pressure Vapor Line Conn (in., OD) 3/4 + 7/8 Braze 7/8 + 7/8 Braze 7/8 + 1-1/8 Braze
Piping for Heat Pump Operation7
Liquid Line Connection (in., OD) 3/8 + 1/2 Braze 1/2 + 1/2 Braze 5/8 + 5/8 Braze
Low Pressure Vapor Line Conn (in., OD) 7/8 + 1-1/8 Braze 1-1/8 + 1-1/8 Braze 1-1/8 + 1-1/8 Braze
Piping for Water7
Water Inlet/Outlet Connection Size (in) (1-1/2 + 1-1/2 Fem) x2 (1-1/2 + 1-1/2 Fem) x2 (1-1/2 + 1-1/2 Fem) x2
Condensate Drain (in) 3/4 Female 3/4 Female 3/4 Female
Multi V Water V 575V Unit Specications
GENERAL DATA
1 Rated capacity is certified under AHRI Standard 1230. Ratings are subject to change without notice. Current certified ratings are
available at www.ahridirectory.org.
2 When entering water temperature is lower than 59ºF, variable water flow control kit PWFCKN000 is required.
3 Sound pressure levels are tested in an anechoic chamber under ISO 3745 standard.
4 Value is calculated as follows: Δt = Total Heat of Rejection/(Nominal Flow Rate x 500).
5 Communication cable between Master ODU to Slave ODU(s), and Master ODU to IDUs / HRUs to be 18 AWG, 2-conductor,
twisted, stranded, shielded. Ensure the communication cable shield is properly grounded to the Master ODU chassis only.
Do not ground the ODU to IDUs / HRUs communication cable at any other point. Wiring must comply with all applicable local and
national codes.
6 Power wiring is field provided, solid or stranded, and must comply with the applicable local and national codes.
7 LG requires that LATS software be used on all projects to ensure correct line sizing. Designer must verify the shop drawing design
against the as built design using LATS. Contractor must also use LG manufactured Y-Branch and Header Kits only.
Table 3: Multi V Water V 575V Units
Combination Unit Model Number 36.0 Ton
ARWM432CAS5
40.0 Ton
ARWM480CAS5
48.0
ARWM576CAS5
Individual Component Model Numbers ARWM144CAS5 x 3 ARWM144CAS5 x 2
+ARWM192CAS5 x 1 ARWM192CAS5 x 3
Cooling Performance
Nominal Cooling Capacity (Btu/h)1430,500 472,500 571,200
Heating Performance
Nominal Heating Capacity (Btu/h)1486,000 536,000 642,000
Operating Range (Entering Water Temperature)
Cooling (°F)223 – 113 23 – 113 23 – 113
Heating (°F) 14 – 113 14 – 113 14 – 113
Synchronous Operation (°F) 23 – 113 23 – 113 23 – 113
Compressor
Inverter Quantity HSS DC Scroll x 3
Oil/Type PVE/FVC68D
Unit Data
Refrigerant Type R410A
R410A Refrigerant Factory Charge (lbs) 9.9 + 9.9 + 9.9 9.9 + 9.9 + 9.9 9.9 + 9.9 + 9.9
Refrigerant Control/Location EEV/Indoor Unit
Max. Number Indoor Units/System264 64 64
Sound Pressure dB(A)3 Cooling/Heating 59 61 63
Net Unit Weight (lbs.) 348 + 348 + 348 348 + 348 + 348 348 + 348 + 348
Shipping Weight (lbs.) 370 + 370 + 370 370 + 370 + 370 370 + 370 + 370
Communication Cables5,6 2 x 18 AWG
Heat Exchanger (Stainless Steel Plate)
Maximum Pressure Resistance (psi) 640 640 640
Flow at Rated Condition (GPM) 35.5 + 35.5 + 35.5 35.5 + 35.5 + 50.7 50.7 + 50.7 + 50.7
Range of Flow (GPM) 53.3 - 159.8 60.9 – 182.6 76.1 – 228.2
Total Heat of Rejection (Btu/h) 570,300 633,700 760,500
Total Heat of Absorption (Btu/h) 440,400 487,200 580,800
Pressure Drop (ft-wg) 6.50 + 6.50 + 6.50 6.50 + 6.50 + 12.61 12.61 + 12.61 + 12.61
Δt4(°F) 10.7 10.4 10.0
Piping for Heat Recovery Operation7
Liquid Line Connection (in., OD) 1/2 + 1/2 + 1/2 Braze 1/2 + 1/2 + 5/8 Braze 5/8 + 5/8 + 5/8 Braze
Low Pressure Vapor Line Conn (in., OD) 1-1/8 + 1-1/8 + 1-1/8 Braze 1-1/8 + 1-1/8 + 1-1/8 Braze 1-1/8 + 1-1/8 + 1-1/8 Braze
High Pressure Vapor Line Conn (in., OD) 7/8 + 7/8 + 7/8 Braze 7/8 + 7/8 + 1-1/8 Braze 1-1/8 + 1-1/8 + 1-1/8 Braze
Piping for Heat Pump Operation7
Liquid Line Connection (in., OD) 1/2 + 1/2 + 1/2 Braze 1/2 + 1/2 + 5/8 Braze 5/8 + 5/8 + 5/8 Braze
Low Pressure Vapor Line Conn (in., OD) 1-1/8 + 1-1/8 + 1-1/8 Braze 1-1/8 + 1-1/8 + 1-1/8 Braze 1-1/8 + 1-1/8 + 1-1/8 Braze
Piping for Water7
Water Inlet/Outlet Connection Size (in) (1-1/2 + 1-1/2 Fem) x3 (1-1/2 + 1-1/2 Fem) x3 (1-1/2 + 1-1/2 Fem) x3
Condensate Drain (in) 3/4 Female 3/4 Female 3/4 Female
Multi V Water V 575V Unit Specications
GENERAL DATA
1 Rated capacity is certified under AHRI Standard 1230. Ratings are subject to change without notice. Current certified
ratings are available at www.ahridirectory.org.
2 When entering water temperature is lower than 59ºF, variable water flow control kit PWFCKN000 is required.
3 Sound pressure levels are tested in an anechoic chamber under ISO 3745 standard.
4 Value is calculated as follows: Δt = Total Heat of Rejection/(Nominal Flow Rate x 500).
5 Communication cable between Master ODU to Slave ODU(s), and Master ODU to IDUs / HRUs to be 18 AWG, 2-con-
ductor, twisted, stranded, shielded. Ensure the communication cable shield is properly grounded to the Master ODU
chassis only. Do not ground the ODU to IDUs / HRUs communication cable at any other point. Wiring must comply
with all applicable local and national codes.
6 Power wiring is field provided, solid or stranded, and must comply with the applicable local and national codes.
7 LG requires that LATS software be used on all projects to ensure correct line sizing. Designer must verify the shop
drawing design against the as built design using LATS. Contractor must also use LG manufactured Y-Branch and Header
Kits only.

16 |WSU PRODUCT DATA WSU PRODUCT DATA | 17
Water Source Unit Product Data
MULTI V Water V Water Source Unit Engineering Manual
© LG Electronics Canada, Inc., North York, ON Canada. All rights reserved. “LG” is a registered trademark of LG Corp. © LG Electronics Canada, Inc., North York, ON Canada. All rights reserved. “LG” is a registered trademark of LG Corp.
Table 4: 575V, 60Hz, 3-Phase Multi V Water V
For component model numbers, see the specification tables.
For 575V systems, acceptable voltage range is 518V - 632V.
Maximum allowable voltage unbalance is 2%.
MCA = Minimum Circuit Ampacity.
Maximum Overcurrent Protection (MOCP) is calculated as follows: (Largest motor RLA x 2.25) + (Sum of
other motor RLA) rounded down to the nearest standard fuse size.
Nom.
Tons
System
Model No.
Compressor (Comp.) MCA MOCP
Comp.
Qty.
Motor RLA (Ea.) Frame 1 Frame 2 Frame 3 Frame 1 Frame 2 Frame 3
Frame 1 Frame 2 Frame 3
6.0 ARWM072CAS5 1 7.1 – – 8.9 – – 15 – –
8.0 ARWM096CAS5 1 7.6 – – 9.5 – – 15 – –
10.0 ARWM121CAS5 1 9.3 – – 11.7 – – 20 – –
12.0 ARWM144CAS5 1 11.6 – – 14.5 – – 25 – –
16.0 ARWM192CAS5 1 14.2 – – 17.8 – – 30 – –
20.0 ARWM240CAS5 2 7.6 11.6 – 14.5 9.5 – 25 15 –
24.0 ARWM289CAS5 2 11.6 11.6 – 14.5 14.5 – 25 25 –
28.0 ARWM337CAS5 2 14.2 11.6 – 17.8 14.5 – 30 25 –
36.0 ARWM432CAS5 3 11.6 11.6 11.6 14.5 14.5 14.5 25 25 25
40.0 ARWM480CAS5 3 14.2 11.6 11.6 17.8 14.5 14.5 30 25 25
48.0 ARWM576CAS5 3 14.2 14.2 14.2 17.8 17.8 17.8 30 30 30
Multi V Water V 575V Unit Specications
ELECTRICAL DATA
Multi V Water V 575V Models Nominal Cooling
(Btu/h)
Indoor Units
Max. Qty. Sum of Indoor Unit Nominal Cooling Capacities (Btu/h)
Min. Capacity (Btu/h) (50%)1Max. Capacity (Btu/h) (130%)2
ARWM072CAS5 72,000 13 36,000 93,600
ARWM096CAS5 96,000 16 48,000 124,800
ARWM121CAS5 119,700 20 60,000 156,000
ARWM144CAS5 144,000 23 72,000 187,200
ARWM192CAS5 192,000 32 96,000 249,600
ARWM240CAS5 239,400 39 120,000 312,000
ARWM288CAS5 287,700 45 144,000 374,400
ARWM336CAS5 336,000 55 168,000 436,800
ARWM432CAS5 430,500 64 216,000 561,600
ARWM480CAS5 472,500 64 240,000 624,000
ARWM576CAS5 571,200 64 288,000 748,800
Table 5: Multi V Water V 575V Unit / Indoor Unit Matching Limitations
CONNECTION LIMITATIONS
1 50% = Minimum Combination Ratio.
2 130% = Maximum Combination Ratio.
Water Source Units

18 |WSU PRODUCT DATA WSU PRODUCT DATA | 19
Water Source Unit Product Data
MULTI V Water V Water Source Unit Engineering Manual
© LG Electronics Canada, Inc., North York, ON Canada. All rights reserved. “LG” is a registered trademark of LG Corp. © LG Electronics Canada, Inc., North York, ON Canada. All rights reserved. “LG” is a registered trademark of LG Corp.
Single Frame Heat Pump and Heat Recovery
DIMENSIONS
Dual Frame Heat Pump and Heat Recovery
DIMENSIONS
Job Name/Location
ARWM072CAS5
Multi VTM Water 5 Heat Pump/Heat Recovery
6 Ton Water Source Unit
Tag No:
Date:
PO No:
Page 2 of 2
For continual product development, LG reserves the right to change specifications without notice.
Job Name/Location
Tag No:
Date:
PO No:
Page 2 of 2
For continual product development, LG reserves the right to change specifications without notice.
ARWM288CAS5
Multi VTM Water 5
Heat Pump/Heat Recovery
28 Ton Water Source Unit
ARWM144CAS5
ARWM144CAS5