LG Multi V water mini Series Owner's manual

Installation, Operation & Maintenance Manual
ARWN038GA2 ARWN048GA2 ARWN053GA2
Heat Pump 208-230V, 60Hz, 1 Phase
Variable Refrigerant Flow Water Source Units
3.0, 4.0, and 4.4 Tons

The instructions included in this manual must be followed to prevent product malfunction, property damage, injury, or death to the user or
other people. Incorrect operation due to ignoring any instructions will cause harm or damage. The level of seriousness is classified by the
symbols described below.
This symbol indicates that the action or lack thereof could possibly cause death or personal injury.
This symbol indicates that the action or lack thereof could possibly cause property damage.
This symbol indicates that the following action should not be performed.
" "
" "
" "
Note:
This symbol indicates that the action or lack thereof could possibly cause equipment malfunction or failure.
" "
Do not throw away, destroy, or lose this manual.
Please read carefully and store in a safe place for future reference.
Content familiarity required for proper installation.
A summary list of safety precautions begins on page 4.
For more technical materials such as submittals, engineering
databooks, and catalogs, visit www.lg-vrf.com.
For continual product development, LG Electronics U.S.A., Inc., reserves the right to change specifications without notice.
©LG Electronics U.S.A., Inc.
This document, as well as all reports, illustrations, data, information, and other materials are the property of LG Electronics U.S.A., Inc.
PROPRIETARY DATA NOTICE
This document, as well as all reports, illustrations, data, information, and
other materials are the property of LG Electronics U.S.A., Inc., and are
disclosed by LG Electronics U.S.A., Inc., only in confidence.
This document is for design purposes only.

3
Product Data
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
Safety Precautions ...................................................................................................................................................................................................... 4-7
Installation….............................................................................................................................................................................................................. 4-5
Wiring………………………………………………………………………………………………………………………………………………………………… 6
Operation …………………………………………………………………………………………………………………………………………………………… 7
Nomenclature ���������������������������������������������������������� 8
Water Source Unit Specications ............................................................................................................................................................................ 9-16
General and Electrical Data.......................................................................................................................................................................................... 9
Dimensions................................................................................................................................................................................................................. 10
Refrigerant Circuits................................................................................................................................................................................................ 11-13
Wiring Diagram........................................................................................................................................................................................................... 14
Accessories ........................................................................................................................................................................................................... 15-16
Installation ��������������������������������������������������������� 17-62
Placement Considerations.......................................................................................................................................................................................... 17
Transporting / Lifting the Water Source Unit............................................................................................................................................................... 18
Minimum Space Requirements .................................................................................................................................................................................. 19
General Mounting / Anchoring the Water Source Unit................................................................................................................................................ 20
Refrigerant Piping Installation ............................................................................................................................................................................... 21-40
Computer-assisted Refrigerant Pipe Design .............................................................................................................................................................. 21
System Engineering .............................................................................................................................................................................................. 22-30
Pipe Sizing............................................................................................................................................................................................................. 31-34
Refrigerant Pipe Connections................................................................................................................................................................................ 35-37
Insulating the Refrigerant Piping System .............................................................................................................................................................. 38-39
Pressure Testing ........................................................................................................................................................................................................ 40
Water Circuit Installation ...................................................................................................................................................................................... 41-117
Water Circuit Design.............................................................................................................................................................................................. 41-42
Piping System Specications ................................................................................................................................................................................ 43-46
Flow Switches and Solenoid Valves ...................................................................................................................................................................... 47-48
Variable Water Flow Control Kit............................................................................................................................................................................. 49-56
Electrical System Installation................................................................................................................................................................................. 57-62
General Information.................................................................................................................................................................................................…57
Power Wiring .............................................................................................................................................................................................................. 58
Wiring and Cable Terminations................................................................................................................................................................................... 59
Communications Cables........................................................................................................................................................................................ 60-62
Pre-commissioning and Maintenance................................................................................................................................................................... 63-78
Preparing the Electrical System ................................................................................................................................................................................. 63
Indoor Unit Auto Addressing Auto Addressing ....................................................................................................................................................... 63-66
Group Control............................................................................................................................................................................................................. 67
Central Control ...................................................................................................................................................................................................... 67-69
Indoor Unit Temperature Sensing Strategy / Air Balance ........................................................................................................................................... 70
Prepare the Refrigerant Piping System...................................................................................................................................................................... 71
Preparing / Balancing the Water Circuit...................................................................................................................................................................... 72
Prepare Pre-commissioning Package Documents..................................................................................................................................................... 73
Initiate a Request........................................................................................................................................................................................................ 73
Maintaining the Heat Exchanger ................................................................................................................................................................................ 74
General Maintenance Schedule ............................................................................................................................................................................ 75-76
Error Codes.............................................................................................................................................................................................................. 77-82
LG Monitoring View (LGMV) Diagnostic Software................................................................................................................................................. 77-78
Error Code Tables.................................................................................................................................................................................................. 79-81
Checklists................................................................................................................................................................................................................. 83-90
LG Multi V Pre-Commissioning Device
Conguration Worksheet............................................................................................................................................................................................ 83
Installation Checklist.............................................................................................................................................................................................. 84-85
Pre-commissioning Checklist ................................................................................................................................................................................ 86-89
Refrigerant Charge Worksheet................................................................................................................................................................................... 90
TABLE OF CONTENTS

4
MULTI V Water Mini System Installation Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
The instructions below must be followed to prevent product malfunction, property damage, injury or death to the user or other people.
Incorrect operation due to ignoring any instructions will cause harm or damage. The level of seriousness is classified by the symbols
described below.
SAFETY PRECAUTIONS
This symbol indicates that the action or lack thereof could possibly cause death or personal injury.
This symbol indicates that the action or lack thereof could possibly cause property damage.
This symbol indicates that the following action should not be performed.
" "
" "
" "
Note:
This symbol indicates that the action or lack thereof could possibly cause equipment malfunction or failure.
" "
Do not install, remove, or re-install the unit by yourself
(customer). Ask the dealer or an authorized technician to
install the unit.
Improper installation by the user may result in water leakage, re,
explosion, electric shock, physical injury or death.
For replacement of an installed unit, always contact an
authorized LG service provider.
There is risk of re, electric shock, explosion, and physical injury or death.
Do not install the water-source units outside.
There is risk of re, electric shock, explosion, and physical injury or death.
Be very careful when transporting the product.
• One person should not carry the product.
• Some products use polypropylene bands for packaging. Do not use
polypropylene bands to lift the unit.
• Suspend the water source unit from the base at specified positions.
Support the water source unit a minimum of four points to avoid slip-
page from rigging apparatus.
The water source unit is shipped with refrigerant and the ser-
vice valves closed. Do not open service valves on the water
source unit until all non-condensable have been removed
from the piping system and authorization to do so has been
obtained from the commissioning agent.
There is a risk of equipment damage, refrigerant contamination, refriger-
ant loss, physical injury or death.
The water source unit is shipped with a refrigerant and
service valves closed. Do not run the compressor with the
service valves closed.
There is a risk of equipment damage, explosion, physical injury, or death.
Dispose the packing materials safely.
• Packing materials, such as nails and other metal or wooden parts,
may cause puncture wounds or other injuries.
• Tear apart and throw away plastic packaging bags so that children
may not play with them and risk suffocation and death.
Install the unit considering the potential for strong winds or
earthquakes.
Improper installation may cause the unit to fall over, resulting in physical
injury or death.
If the air conditioner is installed in a small space, take
measures to prevent the refrigerant concentration from
exceeding safety limits in the event of a refrigerant leak.
Consult the latest edition of ASHRAE (American Society of Heating,
Refrigerating, and Air Conditioning Engineers) Standard 15. If the
refrigerant leaks and safety limits are exceeded, it could result in personal
injuries or death from oxygen depletion.
Wear protective gloves when handling equipment. Sharp
edges may cause personal injury.
Do not install the unit on a defective stand.
It may result in an accident that causes product damage or personal injury
or death.
Do not change the settings of the protection devices.
If the pressure switch, thermal switch, or other protection device is
shorted and forced to operate improperly, or parts other than those
specied by LG are used, there is risk of re, electric shock, explosion,
and physical injury or death.
Do not store or use ammable gas or combustibles near the
unit.
There is risk of product failure, re, explosion, and physical injury or death.
INSTALLATION

5
Product Data
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
Keep the unit upright during installation.
To avoid vibration or water leakage.
When installing the water source unit in a low-lying area, or
a location that is not level, use a raised concrete pad or con-
crete blocks to provide a solid, level foundation.
This may prevent water damage and reduce abnormal vibration.
Properly insulate all cold surfaces to prevent “sweating.”
Cold surfaces such as uninsulated piping can generate condensate that
may drip and cause a slippery oor condition and / or water damage to
walls.
When installing the unit in a hospital, data center, or similar
electromagentic eld (EMF) sensitive environment, provide
sufcient protection against electrical noise.
Inverter equipment, power generators, high-frequency medical equip-
ment, or radio communication equipment may cause the air conditioner
to operate improperly. The unit may also affect such equipment by creat-
ing electrical noise that disturbs medical treatment or image broadcasting.
Do not use the product for special purposes such as pre-
serving foods, works of art, wine coolers, or other precision
air conditioning applications. The equipment is designed to
provide comfort cooling and heating.
There is risk of property damage.
Do not make refrigerant substitutions. Use R410A only.
If a different refrigerant is used, or air mixes with original refrigerant, the
unit will malfunction and be damaged.
When connecting refrigerant tubing, remember to allow for
pipe expansion.
Improper piping may cause refrigerant leaks and system malfunction.
Do not install the water source unit in a noise sensitive area.
Take appropriate actions at the end of HVAC equipment life
to recover, recycle, reclaim or destroy R410A refrigerant
according to applicable U.S. Environmental Protection
Agency (EPA) rules.
INSTALLATION, CONTINUED
Note:
SAFETY PRECAUTIONS
Replace all control box and panel covers.
If cover panels are not installed securely, dust, water and animals may
enter the water source unit, causing re, electric shock, and physical in-
jury or death.
Install the unit in a safe location where nobody can step on
or fall onto it.
There is risk of unit damage, physical injury or death.
Always check for system refrigerant leaks after the unit has
been installed or serviced.
Low refrigerant levels may cause product failure, and exposure to high
concentration levels of refrigerant gas may lead to illness or death.

6
MULTI V Water Mini System Installation Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
Do not supply power to the unit until all installation and pre-
commissioning tasks are complete and the commissioning
agent indicates it is safe to do so.
The information contained in this manual is intended for use
by an industry-qualied, experienced, certied electrician
familiar with the U.S. National Electric Code (NEC) who is
equipped with the proper tools and test instruments.
Failure to carefully read and follow all instructions in this manual can
result in equipment malfunction, property damage, personal injury or
death.
All electric work must be performed by a licensed electrician
and conform to local building codes or, in the absence of
local codes, with the National Electrical Code, and the
instructions given in this manual.
If the power source capacity is inadequate or the electric work is not
performed properly, it may result in re, electric shock, physical injury or
death.
High voltage electricity is required to operate this system.
Adhere to the NEC code and these instructions when wiring.
Improper connections and inadequate grounding can cause accidental
injury or death.
Always ground the unit following local, state, and NEC codes.
There is risk of re, electric shock, and physical injury or death.
Properly size all circuit breakers or fuses.
There is risk of re, electric shock, explosion, physical injury or death.
Refer to local, state, and federal codes, and use power wires
of sufcient current capacity and rating.
Wires that are too small may generate heat and cause a re.
Secure all eld wiring connections with appropriate wire
strain relief.
Improperly securing wires will create undue stress on equipment power
lugs. Inadequate connections may generate heat, cause a re and physi-
cal injury or death.
Properly tighten all power lugs.
Loose wiring may overheat at connection points, causing a re, physical
injury or death.
Do not change the settings of the protection devices.
If the pressure switch, thermal switch, or other protection devices
are bypassed or forced to work improperly, or parts other than those
specied by LG are used, there is risk of re, electric shock, explosion,
and physical injury or death.
Turn the power off at the nearest disconnect before servicing
the equipment.
Electrical shock can cause physical injury or death.
WIRING
Note:
SAFETY PRECAUTIONS

7
Product Data
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
SAFETY PRECAUTIONS
Do not use this equipment in mission critical or special-
purpose applications such as preserving foods, works of art,
wine coolers or refrigeration. The equipment is designed to
provide comfort cooling and heating.
Oil, steam, sulfuric smoke, etc., can signicantly reduce the perfor-
mance of the unit, or damage its parts.
Do not turn off the main power switch after operation has
been stopped.
Wait at least ve (5) minutes before turning off the main power
switch, otherwise it may result in product malfunction.
Provide power to the compressor crankcase heaters at least
six (6) hours before operation begins.
Starting operation with a cold compressor sump(s) may result in severe
bearing damage to the compressor(s). Keep the power switch on during
the operational season.
Clean up the site after servicing is nished, and check that
no metal scraps, screws, or bits of wiring have been left
inside or surrounding the unit.
Do not allow water, dirt, or animals to enter the unit.
There is risk of unit failure, re, electric shock, physical injury or death.
Do not provide power to or operate the unit if it is ooded or
submerged.
There is risk of re, electric shock, physical injury or death.
Use a dedicated outlet for this product.
There is risk of re, electric shock, physical injury or death.
Do not operate the disconnect switch with wet hands.
There is risk of re, electric shock, physical injury or death.
Periodically verify the equipment mounts have not
deteriorated.
If the base collapses, the unit could fall and cause property damage,
product failure, physical injury or death.
Do not touch the refrigerant piping during or after operation.
It can cause burns or frostbite.
Do not operate the unit with the panel(s) or protective
cover(s) removed; keep ngers and clothing away from
moving parts.
The rotating, hot, cold, and high-voltage parts of the unit can cause
physical injury or death.
If gas leaks out, ventilate the area before operating the unit.
Leaking gas may cause re, electric shock, explosion, physical injury or
death if the water source unit is mounted in an enclosed, low-lying, or
poorly ventilated area and the system develops a refrigerant leak.
To avoid physical injury, use caution when cleaning or
servicing the air conditioner.
The water source unit is shipped with refrigerant and the ser-
vice valves closed. Do not open service valves on the water
source unit until all non-condensable have been removed
from the piping system and authorization to do so has been
obtained from the commissioning agent.
There is a risk of equipment damage, refrigerant contamination, refriger-
ant loss, physical injury or death.
The water source unit is shipped with a refrigerant and
service valves closed. Do not run the compressor with the
service valves closed.
There is a risk of equipment damage, explosion, physical injury, or death.
OPERATION

8
MULTI V Water Mini System Installation Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
038 G A
Type
N = Heat Pump
Electrical Ratings
G = 208–230V / 60Hz / 1Ø
038 = 38,200
048 = 47,800
053 = 52,900
Condenser
W = Water Source
Family
AR = Multi V (Refrigerant R410A)
2
Basic Function = A
Generation
2 = Second
Water Source Units (WSU)
AR W N
Nominal Capacity
Nominal cooling capacity in Btu/h
UNIT NOMENCLATURE
Water Mini Unit

9
Product Data
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
GENERAL DATA
Water Mini Unit Specications and Electrical Data
1Cooling – Indoor 80°F DB/66°F WB, Water Temp. Entering 86°F;
Heating- Indoor 68°F DB, Water Temp. Entering 68°F.
2Voltage tolerance is ±10%.
3Sound pressure levels as tested in anechoic chamber under ISO
Standard 3745.
4Refer to the Refrigerant Piping Section of this manual for correct
line sizing. Contractor MUST use LG manufactured Y-branch fittings
only. Designer must verify refrigerant piping design configuration
using LG’s computerized refrigerant piping CAD/calculation (LATS)
Software to layout and design the refrigerant piping system.
5Calculated from ∆T = Total Heat of Rejection / (Nominal flow rate
x 500).
Table 1: General Data—ARWN038GA2, ARWN048GA2, ARWN053GA2 Water Mini Units.
Table 2: 208-230V, 60Hz, 1-Phase Water Mini Unit Electrical Characteristics.
Nominal Tons Unit Model No. Compressor Qty. Compressor Motor RLA MSC MCA MOP
3.0 ARWN038GA2 1 20.8 - 26 45
4.0 ARWN048GA2 1 21.2 - 26.5 45
4.4 ARWN053GA2 1 21.6 - 27 45
MCA = Minimum Circuit Ampacity.
MOP = Maximum Overcurrent Protection is calculated as follows: (Largest motor FLA x 2.25) + (Sum of
other motor FLA) rounded down to the nearest standard fuse size.
Allowable voltage range is between 208–230 volts only (tolerance is 10%).
Maximum allowable voltage imbalance is 2%.
Power wiring to be sized to meet local or NEC codes.
Measurements are taken with no attenuation and units operating at full load nominal operating
condition.
Measurements are taken 4.9 feet above the finished floor and a distance of 3.3 feet from the face of the
fan discharge.
3.0 Ton 4.0 Ton 4.4 Ton
Model Number ARWN038GA2 ARWN048GA2 ARWN053GA2
Nominal Capacity / Input Power
Cooling Capacity (Btu/h)138,200 47,800 52,900
Cooling Input Power (kW) 2.1 2.7 3.2
Heating Capacity (Btu/h)142,600 54,600 61,400
Heating Input Power (kW) 2.2 2.9 3.5
Compressor
Type Inverter Rotary Inverter Rotary Inverter Rotary
Power Supply (volt/hz/phase)2208-230 / 60 / 1 208-230 / 60 / 1 208-230 / 60 / 1
MCA (A) 26 26.5 27
MOP (A) 45 45 45
System Data
Sound Pressure (dBA)352 53 54
Heat Rejected to Equipment Room (Btu/h) 512 512 512
Net Weight (lbs) 168 168 168
Shipping Weight (lbs) 181 181 181
Dimensions (W x H x D) 20-5/8 x 42-1/2 x 13-1/8 20-5/8 x 42-1/2 x 13-1/8 20-5/8 x 42-1/2 x 13-1/8
Max. Qty Indoor Units 689
Refrigerant Piping Connections4
Vapor Line OD (in) 3/4 Braze 3/4 Braze 3/4 Braze
Liquid Line OD (in) 3/8 Braze 3/8 Braze 3/8 Braze
Expansion Device Electronically Controlled (EEV) Electronically Controlled (EEV) Electronically Controlled (EEV)
Factory Refrigerant Charge (R410A [lbs]) 2.2 2.2 2.2
Water Side
Heat Exchanger Stainless Steel Plate Stainless Steel Plate Stainless Steel Plate
Water Volume in Heat Exchanger (gal.) 0.2 0.2 0.2
Water Inlet/Outlet Connection
Size (in) 1-1/4 FPT 1-1/4 FPT 1-1/4 FPT
Nominal Flow Rate Total (GPM) 10.6 13.2 15.9
Range of Flow (GPM) 5.5-13.3 6.9-16.5 8.3-19.9
Entering water temp. range (°F)– Cooling 50-113 50-113 50-113
Entering water temp. range (°F)– Heating 23-113 23-113 23-113
Total Heat of Rejection (Btu/h) 44,330 55,550 56,640
Total Heat of Absorption (Btu/h) 35,087 44,697 49,448
Pressure Drop (ft) 4.7 6.9 9.5
Maximum Water Pressure (psi) 640 640 640
ΔT (°F)5887

10
MULTI V Water Mini System Installation Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
ARWN038GA2, ARWN048GA2, ARWN053GA2
DIMENSIONS
Figure 1: ARWN038GA2, ARWN048GA2, ARWN053GA2 Dimensions.
H
S
ide View
F
ront View
Top View Isometric
L7
L
L
6
L5
L4
L
3
L1
L
L
2
V
apor
Li
ne
Liquid Line
C
apped Line
Wa
t
e
r
Ou
tl
et
Wa
t
e
r Inl
et
Z
X
Y
M
1
M2
W
D
W
D
H
L
1
L
2
L
3
L4
L
5
L
6
L7
L
8
M
1
M2
X
Y
Z

11
Product Data
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
REFRIGERANT FLOW DIAGRAMS
Cooling Mode
EEV
Filter
EEV
Filter
IndoorHEXIndoor HEX
Fan
Indoor Unit Indoor Unit
Fan
Liquid
Gas
HEX
Temp
Liquid
Temp
Suction
Temp
Hot Gas
Bypass
Valve
4 Way
Valve
Main
EEV
Low
Pressure
Sensor
Accumu
lator
Inv.
Comp.
High
Pressure
Switch
Discharge
Temp
High
Pressure
Sensor
Check
Valve
Solenoid
Valve Strainer Thermistor
Remark
High
Pressure
Switch
S
High
Water In Water Out
Plate
Heat Exchanger
Pressure
Sensor SVC
Valve
Fusible
Plug
EEV
Fusible
Plug
High Te mperature High Pressure Gas
High Te mperature High Pressure Liquid
Low Te mperature Low Pressure Gas
S
Figure 2: ARWN038GA2, ARWN048GA2, ARWN053GA2—Cooling Mode.
ARWN038GA2, ARWN048GA2, ARWN053GA2

12
MULTI V Water Mini System Installation Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
ARWN038GA2, ARWN048GA2, ARWN053GA2
REFRIGERANT FLOW DIAGRAMS
Figure 3: ARWN038GA2, ARWN048GA2, ARWN053GA2—Heating Mode.
EE V
Filter
EEV
Filter
Indoor HEX
Indoor Unit
Indoor HEX
Indoor Unit
Fan Fan
Liquid
Gas
HEX
Temp
Liquid
Temp
Hot Gas
Bypass
Valve
4 Way
Valve
Main
EEV
Accumu
lator
Inv.
Comp.
High
Pressure
Switch
Discharge
Temp
High
Pressure
Sensor
High
Water In Water Out
Plate
Heat Exchanger
Suction
Temp
Low
Pressure
Sensor
Fusible
Plug
Check
Valve
Solenoid
Valve Strainer Thermistor
Remark High
Pressure
Switch
Pressure
Sensor SVC
Valve
Fusible
Plug
EEV
High Te mperature High Pressure Gas
High Te mperature High Pressure Liquid
Low Te mperature Low Pressure Gas
S
S
Heating Mode

13
Product Data
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
Oil Return Operation
REFRIGERANT FLOW DIAGRAMS
Figure 4: ARWN038GA2, ARWN048GA2, ARWN053GA2—Oil Return.
Filter Filter
Indoor Unit Indoor Unit
Fan Fan
Indoor HEX Indoor HEXEEV EEV
Liquid
Gas
HEX
Temp
Liquid
Temp
Suction
Temp
Hot Gas
Bypass
Valve
4 Way
Valve
Main
EEV
Low
Pressure
Sensor
Accumu
lator
Inv.
Comp.
High
Pressure
Switch
Discharge
Temp
High
Pressure
Sensor
High
Water In Water Out
Plate
Heat Exchanger
Fusible
Plug
Check
Valve
Solenoid
Valve Strainer Thermistor
Remark High
Pressure
Switch
Pressure
Sensor SVC
Valve
Fusible
Plug
EEV
High Te mperature High Pressure Gas
High Te mperature High Pressure Liquid
Low Te mperature Low Pressure Gas
S
S
ARWN038GA2, ARWN048GA2, ARWN053GA2

14
MULTI V Water Mini System Installation Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
WIRING DIAGRAM
83
ARWN038GA2, ARWN048GA2, ARWN053GA2
Figure 5: ARWN038GA2, ARWN048GA2, ARWN053GA2 Wiring Diagram.

15
Product Data
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
ACCESSORIES
Required Accessories Model No.
Y-branches
(for indoor unit connection)
ARBLN01621
ARBLN03321
Headers
(for indoor unit connection)
Four (4) branch Seven (7) branch Ten (10) branch
ARBL054 ARBL057 ARBL1010
ARBL104 ARBL107 ARBL2010
Vapor pipe Liquid pipe
Unit: Inch
Models
ARBLN01621
ARBLN03321
16-1/4
15-3//8
I.D. 3/4
I.D. 3/4
I.D. 3/4
I.D. 3/4
O.D. 5/8
I.D. 1/2
I.D. 5/8
I.D. 5/8
I.D. 5/8 I.D. 1/2
I.D. 1/2 I.D. 1/2
I.D. 1/2
I.D. 1/2
I.D. 1/2
I.D. 1/2
I.D. 1/2
11-1/2
11-1/16
11-1/2
11-1/16
2-15/16
2-15/16
2-15/16
2-3/4
2-3/4
2-3/4
I.D. 5/8
I.D. 5/8
I.D. 1
I.D. 1
O.D. 1
3-3/16 4-3/8
13-1/16
12-5/8
3-5/16
12
3
3
O.D. 3/4
O.D. 3/4
1 2
I.D. 7/8
I.D. 7/8
I.D. 7/8
I.D. 1/4
I.D. 1/4
I.D. 1/4
I.D. 1/4
I.D. 1/4
1
1
1
1
I.D. 1-1/8
I.D. 3/8
I.D. 3/8
I.D. 3/8
I.D. 3/8
I.D. 3/8
I.D. 3/8
O.D. 3/8
Table 3: Y-branch Table.
Table 4: Required Accessories.
Y-branches (for indoor unit connection)

16
MULTI V Water Mini System Installation Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
Unit: Inch
4 branch
ARBL054
7 branch
ARBL057
4 branch
ARBL104
7 branch
ARBL107
10 branch
ARBL1010
10 branch
ARBL2010
Models Vapor pipe Liquid pipe
14-3/16
21-1/4 21-1/4
4-3/4
I.D. 5/8
I.D. 1/2
I.D. 1/2
I.D. 5/8
I.D. 5/8
I.D. 3/4
4-3/4
14-3/16
I.D. 3/8
I.D. 3/8
I.D. 1/4
I.D. 1/4
I.D. 3/8
I.D. 1/2
5-15/16
5-15/16
5-15/16 5-15/16
5-15/16
15-3/4
6-5/16
I.D. 5/8
I.D. 1/2
I.D. 3/4
I.D. 5/8
I.D 7/8
I.D. 1-1/8 I.D. 1
4-3/4
4-3/4
4-3/4 4-3/4
4-3/4
4-3/4
4-3/4
4-3/4 4-3/4
4-3/4
I.D. 5/8
I.D. 1/2
I.D. 5/8
I.D. 1/2
I.D. 5/8
I.D. 3/4
4-3/4
I.D. 1/4
I.D. 3/8
I.D. 3/8
I.D. 1/2
6-5/16
22-7/8
I.D. 3/4
I.D. 5/8
ID15.88(5/8)
ID12.7(1/2)
I.D. 5/8
I.D. 1/2
I.D. 7/8
I.D. 1-1/8 I.D. 1
27-9/16
4-3/4
I.D. 1/4
I.D. 3/8
I.D. 3/8
I.D. 1/4
I.D. 3/8I.D. 1/2
I.D. 5/8
I.D. 1/2
4-3/4
28-3/8
I.D. 1/4
I.D. 3/8
I.D. 3/8
I.D. 1/4
I.D. 1/2
I.D. 3/8
4-1/4
21-1/2
27-9/16
I.D. 1/4
I.D. 3/8 I.D. 3/4
I.D. 5/8
I.D. 3/8
I.D. 1/4
4-3/4
4-3/4
6-5/16
29-7/8
I.D. 3/4
I.D. 5/8
I.D. 7/8
I.D. 1-1/8 I.D. 1
7-3/16
30-9/16
I.D. 3/4
I.D. 5/8
I.D. 5/8
I.D. 1/2
I.D. 1-1/8
I.D. 1-1/4
I.D. 1-3/8
5-15/16
5-15/16
5-15/16
5-15/16
5-15/16
5-15/16
5-15/16
4-3/4
4-3/4
14-3/16
I.D. 3/8
I.D. 3/8
I.D. 1/4
I.D. 1/4
I.D. 3/8
I.D. 1/2
Table 5: Header Table.
Headers (for indoor unit connection)
ACCESSORIES

17
Installation Instructions
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
Placement Considerations
Selecting the Best Location
The water source unit must be installed indoors in a mechanical room. The mechanical room must be designed such that equipment vibration
or noise does not affect surrounding rooms, and is properly ventilated or conditioned to maintain an acceptable ambient temperature range
between 32°F and 104°F. Mechanical room temperature is required to be maintained between 32°F and 104°F. The water source unit will
reject heat to the mechanical room. See the “General Data” on page 9 for the amount of heat rejected to the equipment room.
• The water source unit must also be located where the refrigerant pipe system is designed within the piping limitations set forth in the Water
Mini Engineering Manual. Location of the water source unit should be strategically located in the building to minimize refrigerant piping
materials, labor, and refrigerant.
• The underlying structure or foundation must be designed per local codes and support the weight of the unit. Units can be stacked above
each other as long as each water source unit is independently supported. Minimum clearances must be maintained either per recommenda-
tions shown in Figures 2 and 3 or local codes, whichever is greater. Include enough space in the installation area for service access (refer
to the installation space requirements).
• The mechanical room floor should be made waterproof. Periodic flushing of the water heat exchanger will be required, and a floor drain
installed nearby the equipment will help facilitate this maintenance.
• The water-source unit should be installed with a closed-loop water system. If an open-loop system is used, it is recommended that an
intermediate heat exchanger be installed.
• When piping, towers, or other system components that contain water and are exposed to ambient air temperatures below 32°F, an anti-
freeze solution must be used. Frozen water will damage the plate heat exchanger. A typical antifreeze solution consists of a proper mixture
of ethylene glycol, propylene glycol, or methanol mixed with water. The designer should also consider the use of a supplemental boiler /
heater to maintain minimum temperatures.
INSTALLATION
Avoid exposing the water-source unit to oil, steam, combustible gases, acidic solutions or sprays, carbon ber, sulfur, or other corrosive gases.
Avoid exposure to electromagnetic waves from EMF radiating machinery such as generators, MRI equipment, or other equipment that emits
electromagnetic energy. The control system may be affected by electromagnetic energy, which may result in abnormal system operation. Also,
the inverter components in the water source units may generate electromagnetic noise, therefore, ensure the water-source unit is placed at an
acceptable distance from computer, audio, and other sensitive electronic equipment. Route power wiring and communications cables in sepa-
rate conduits.
Note:

18
MULTI V Water Mini System Installation Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
INSTALLATION
Transporting / Lifting the Water Source Unit
Transporting / Lifting
• When lifting the unit, use lifting straps and place around the unit as shown below.
• Always lift the unit using properly sized lifting straps rated to carry the unit weight.
• Ensure the straps are long enough to maintain a maximum of a 40° angle as shown at “A”.
Caution when using forklift to transport an unpackaged unit. Consider the unit’s center of gravity when lifting. Protect the painted surfaces as
necessary to prevent damage to the unit nish.
≤40°
Mounting Rail
A:
B:
A
A
• One person should not carry the product.
• Some products include polypropylene bands around the unit for packaging. Do not use polypropylene bands to lift the unit.
• Tear apart and throw away plastic packaging bags so that children may not play with them and risk suffocation and death.
• Lift the water source unit from the base at specified locations. Support the water source unit at a minimum of six (6) points to avoid
slippage from the rigging apparatus.
• Do not drop the unit when carrying it with a forklift.
• Use a minimum of three (3) lifting straps.
• Place a protective cloth or other soft material at the locations where the casing comes in contact with the lifting straps to prevent
damage to painted surfaces.
• Always know where the center of gravity of the water source unit is before lifting. Hoist the unit with the center of gravity centered
among the lifting straps.
Figure 6: Transporting the Water Source Unit.
Capacity
(ton)
Net Weight
(lbs.)
Shipping
Weight (lbs.)
3.0 168 181
4.0 168 181
4.5 168 181
Table 6: Water Mini Net and Shipping Weights.

19
Installation Instructions
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
Minimum Space Requirements
: Required Minimum Service Area
7/84
7-1/2
20-1/2
Field-Provided H-Beam Support
Unit: Inch
23-5/815
42-1/24
4
7/8
Front View
Water pipe
installation
space
Plan View
Exterior of
Water Source
Unit
Service area
(Front)
Figure 7: Required Minimum Space for Water Mini Unit Installation.
Installation Space
When installing the water-source unit, provide service requirements as illustrated. If local code requires additional clearance area, comply
with local codes.
INSTALLATION
Job site conditions may require routing utilities—including the refrigerant piping and electrical wiring—under the unit base. If job site conditions
warrant, consider adding mounting rails under the unit.
Figure 8: Stacked Water Source Units.
Field-Provided H-Beam Support or Floor
Unit: Inch
42-1/24
442-1/2 4
4
Field-Provided H-Beam Support
Note:

20
MULTI V Water Mini System Installation Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
All referenced materials are to be eld-supplied. Images are not to scale, are for reference only, and are not intended to be used for design
purposes.
• Securely fasten all four (4) corners to the
supporting base.
• If not otherwise directed by the structural
engineer or local codes, Use a 7/16 inch or
1/2 inch diameter J-bolt. Use a hexagon nut
with a spring washer.
• Include anti-vibration material chosen by the
acoustics engineer.
• Include enough space for refrigerant piping
and electrical wiring when installing through
the bottom of the unit.
• Use an H-beam, concrete support, or other
acceptable support structure designed by a
structural engineer.
Unit: Inch
8
8
Nut
3
3
Spring Washer
Unit Mounting
Foot
Anti-vibration
Material
Four Bolts
Required
H-Beam
Concrete
Base
4
Three Threads
Note:
Figure 10: Close up of Anchor Bolts.
Location of the
anchor bolts
13-15/16
15-1/4
Unit: Inch
Front
Figure 9: Location of the Anchor Bolts.
• When building a base support for the water source unit, ensure that the floor surface / location has enough strength to support the
weight of the unit, and enough space for pipes and wiring.
• Install the water source unit to a base and in a manner approved by the structural engineer to minimize damage to the unit in the event
of an earthquake. Any deficiency in installation may cause unit to fall, resulting in physical injury or death.
Anchoring the Water Source Unit
General Mounting
Securely attach the water source unit to a concrete pad, base rails, or other mounting platform that is anchored to the building structure.
Avoid placing the unit in a low lying area where water may accumulate. Refer to dimensional drawing in the “Product Data” section on page
10, and follow the applicable local code for clearance, mounting, anchor, and vibration attenuation requirements.
General Mounting / Anchoring the Water Source Unit
INSTALLATION
Plan View
Side View