LG MULTI V HYDRO KIT ARNH963K2A4 User manual

HYDRO KIT MEDIUM TEMPERATURE (K2)
INSTALLATION MANUAL
42,000 to 96,000 Btu/h

For continual product development, LG Electronics U.S.A., Inc. reserves the right to change specifications without notice.
© LG Electronics U.S.A., Inc.
PROPRIETARY DATA NOTICE
For more technical materials such as submittals, catalogs, engineering,
owner’s, best practices, and service manuals, visit www.lghvac.com.
Do not throw away, destroy, or lose this manual.
Please read carefully and store in a safe place for future reference.
Content familiarity is required for proper installation.
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 by the summary list of safety precautions on page 4.
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.

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TABLE OF CONTENTSTABLE OF CONTENTS
3
Safety Precautions .............................................................................4-8
General Data .....................................................................................9-17
Unit Nomenclature............................................................................... 9
Introduction........................................................................................ 10
Parts ...................................................................................................11
R410A Refrigerant ............................................................................. 12
6SHFL¿FDWLRQV .................................................................................... 14
Dimensions........................................................................................ 15
Wiring Diagram.................................................................................. 16
Refrigerant Piping Diagram ............................................................... 17
Accessories ....................................................................................18-20
Installing the Hydro Kit ..................................................................21-25
Location Selection ............................................................................. 21
Unpack / Inspect, Transporting / Lifting ............................................. 22
Transporting / Lifting, Clearance........................................................ 23
Foundation and Mounting Requirements, Anchoring ....................... 24
Placing the Hydro Kit Controller ........................................................ 25
Installing the Refrigerant Piping ...................................................26-29
Refrigerant Piping Connections /
Refrigerant Piping Materials and Handling........................................ 26
Cutting the Refrigerant Piping / Brazing Procedure .......................... 27
Pipe Supports.................................................................................... 28
Heat Recovery Unit Refrigerant Piping Connections......................... 29
Insulation.........................................................................................30-31
Refrigerant Piping System Insulation ................................................ 30
Installing the Condensate Piping....................................................... 32
Installing the Water Circuit ............................................................ 33-47
Connections / Guidelines / Water Quality.......................................... 33
Antifreeze Additives ........................................................................... 34
Water Circuit Components............................................................35-42
Application Options....................................................................... 43-47
Wiring ..............................................................................................48-72
General Information / Separating Wiring and Cables........................ 48
Power Wiring / Communication Cable / Terminal Connections 49
3RZHU:LULQJ6SHFL¿FDWLRQV.............................................................. 50
&RPPXQLFDWLRQV&DEOH6SHFL¿FDWLRQV .............................................. 51
Connecting the Wiring and Cables...............................................52-53
Connecting Included Hydro Kit Accessories.................................54-59
Connecting Optional LG Hydro Kit Accessories ...........................60-64
Connecting Third-Party Accessories.............................................65-70
Resistance Test ................................................................................. 71
Controller Installation ....................................................................72-73
Controller Operation ......................................................................74-84
Pre-Commissioning......................................................................85-100
Hydro Kit DIP Switch Settings ......................................................85-86
Enter Installer Mode ......................................................................... 86
Functions......................................................................................87-95
Central Control .............................................................................96-98
Hydro Kits with Heat Recovery Units.......................................... 99-100
Finishing the Installation .................................................................. 101
Maintenance....................................................................................... 102
Troubleshooting / Error Codes..................................................103-105
Emergency Operation ................................................................106-107
Installation Checklist .................................................................108-109
DeYice ConÀguration Worksheet..................................................... 110

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4
MULTI V Hydro Kit Medium Temperature (K2) Installation Manual
INSTALLATION
Do not install or remove the unit by yourself (end user).
Ask the dealer or an LG trained technician to install the unit.
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shock, physical injury or death.
For replacement of an installed unit, always contact the
dealer or an LG trained service provider.
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Do not handle Hydro Kit units without the use of eye wear,
gloves, and protective clothing. The unit could have sharp edges.
There is a risk of personal injury.
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
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and physical injury or death.
Replace all control box and panel covers after completing work.
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tric shock, and physical injury or death.
Always check for system refrigerant leaks after the unit has
been installed or serviced.
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ness or death.
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lighting strikes.
There is a risk of electric shock, which can result in physical injury or death.
Periodically check that the frame and mounts are not dam-
aged.
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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
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The Hydro Kit must be installed indoors; do not install the
unit outside or in a highly humid environment.
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Dispose the packing materials safely.
• Packing materials, such as nails and other metal or wooden parts, will
cause puncture wounds or other injuries.
• Tear apart and throw away plastic packaging bags so that children will
not play with them and risk suffocation and death.
Install the unit considering the potential for strong winds or
earthquakes.
Improper installation will cause the unit to fall over, resulting in physical
injury or death.
Install the unit in a safe location where nobody can step, fall
onto it, or place objects on it. Do not install the unit on a
defective or wheeled stand.
It will result in an accident that causes physical injury or death.
SAFETY PRECAUTIONS
TABLE OF SYMBOLS
DANGER This symbol indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.
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 should not be performed.
The instructions below must be followed to prevent product malfunction, property damage, injury or death to the user or other people. Incor-
rect operation due to ignoring any instructions will cause harm or damage. The level of seriousness is classified by the symbols described
below.
DANGER
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the unit.
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Do not supply power to the unit until all wiring and piping
are completed or reconnected and checked.
There is risk of physical injury or death due to electric shock.

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Safety Precautions
SAFETY PRECAUTIONS
CAUTION
LG Electronics U.S.A., Inc., is not responsible for any piping
calculations, refrigerant leaks, degradation of performance,
or any other potential problems or damages as a result of
interconnecting piping, their joint connections, isolation
valves, introduced debris inside the piping system, or other
problems caused by the interconnecting piping system.
This product is engineered to be used for comfort cooling /
heating. It is not to be used in applications that require preci-
sion cooling or heating such as data centers, food preserva-
tion, wine coolers, refrigeration and / or freezer applications.
There is risk of property damage.
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Inverter equipment, private power generators, high-frequency medical
equipment, or radio communication equipment will cause the air condi-
tioner to malfunction.
Do not install this product in a location that is noise sen-
sitive. Provide additional acoustical treatment as needed.
Occupants could be disturbed by the operation noise.
Do not install the product where it is exposed directly to
ocean winds.
Sea salt in the air will cause the product to corrode. Corrosion will cause
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Periodically check that the frame is not damaged.
There is a risk of equipment damage.
The Hydro Kit must be installed indoors; do not install the
unit outside and / or in a highly humid environment.
There is risk of product malfunction, failure and property damage.
Install the unit in a safe location where no one can step on or
fall onto it. Do not install the unit on a defective stand.
There is a risk of unit and property damage.
When installing the unit in a low-lying area, or a location that
is not level, use a raised concrete pad or concrete blocks to
provide a solid, level foundation.
This prevents water damage and abnormal vibration.
Always check for system refrigerant leaks after the unit has
been installed or serviced.
Low refrigerant levels will cause product failure.
Properly insulate all cold surfaces to prevent “sweating.”
Cold surfaces such as uninsulated piping can generate condensate that will
drip and cause a slippery surface condition and / or water damage to walls.
The Hydro Kit must be kept in an upright and level position
during installation.
To avoid oil migration from the onboard compressor, vibration, and water leaks.
Verify the piping system has been properly evacuated, and
the system’s refrigerant charge is correct before commis-
sioning and after any repair is made.
Improper system evacuation and / or an improper refrigerant charge will
cause product malfunction.
Properly insulate all cold surfaces when installing this product.
Cold surfaces such as uninsulated piping can generate condensate that
could drip, causing a slippery surface that creates a risk of slipping, fall-
ing, and personal injury.
Always use tools designed for R410A refrigerant.
Improper installation will result in refrigerant leaks, frostbite, suffocation,
physical injury, and or death.
The Hydro Kit water circuit could require antifreeze. Always ask
the dealer or an LG trained technician to install the water circuit.
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Follow manufacturer’s instructions when performing leak and
evacuation tests. Do not use compressed air, oxygen, or
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death.
When installing refrigerant piping, consider pipe expansion.
Improper pipe installation will lead to pipe fatigue / failure, a rapid re-
lease of refrigerant, frostbite, suffocation, physical injury, and or death.
Only use the parts included or approved for the product.
Improper installation will result in physical injury or death.
Be very careful when transporting the unit.
• Hydro Kit weight and size preclude one person carrying the unit. Use two or more people to transport the unit because there is a risk of
personal injury. Keep the unit upright.
• Some products use polypropylene bands for packaging. Do not use polypropylene bands to lift the unit.
• Suspend the from the base at specified positions. Support the unit a minimum of four points to avoid slippage from rigging apparatus.

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6
MULTI V Hydro Kit Medium Temperature (K2) Installation Manual
SAFETY PRECAUTIONS
WIRING
When installing refrigerant piping, consider pipe expansion.
Improper pipe installation will lead to pipe fatigue / failure and a rapid
release of refrigerant, which results in product malfunction.
Follow manufacturer’s instructions when performing leak and
evacuation tests. Do not use compressed air, oxygen, or
ÀDPPDEOHJDVHV
There is a risk of product malfunction due to refrigerant leaks from
improper installation procedures.
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There is a risk of product failure.
Do not make refrigerant substitutions. Use R410A only.
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unit will malfunction and damage will occur.
Take appropriate actions at the end of HVAC equipment life
to recover, recycle, reclaim, or destroy R410A refrigerant ac-
cording to applicable U.S. Environmental Protection
Agency (EPA) rules.
Install the drain hose to ensure adequate drainage.
There is a risk of water leakage and property damage.
DANGER
High voltage electricity is required to operate this system.
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system. Adhere to the local, state, and U.S. National Electric
Codes (NEC) and these instructions when wiring.
Improper connections, inadequate power source capacity, and inade-
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Properly size all circuit breakers or fuses.
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Always ground the unit following local, state, and NEC codes.
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Turn the power off at the nearest disconnect before servic-
ing the equipment. Use appropriate meters and equipment to
verify the power is off.
Electrical shock can cause physical injury or death.
Do not use damaged or loose power wiring. Do not
modify or extend the Hydro Kit’s power wiring. Ensure that
the power wiring will not be pulled, nor weight be placed on
the power wiring.
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The information contained in this manual is intended for use
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iar with the NEC, safety procedures and equipped with the
proper tools and test instruments.
Failure to carefully read and follow all instructions in this manual will
result in 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 NEC, and the instructions given in this
manual.
If the power source capacity is inadequate or the electric work is not
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or death.
Replace all control box and panel covers.
If cover panels are not installed securely, dust, water and animals will
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death.
Refer to local, state, and federal codes, and use power wires
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Properly secure power wires and communications cables
at connectors, and provide slack in cable to eliminate wire
strain.
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physical injury or death.
Use a properly sized circuit protective device.
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Always use lock-out, tag-out procedures!
Ensure the electrical power is off and the disconnect is locked and
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shock, physical injury or death.
Do not place a het source near the wiring.
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Safety Precautions
SAFETY PRECAUTIONS
The information contained in this manual is intended for use
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with safety procedures and equipped with the proper tools
and test instruments.
Failure to carefully read and follow all instructions in this manual will
result in equipment malfunction and / or property damage.
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sensitive equipment sharing a power source with this product.
There is a risk of equipment damage or malfunction.
Use a properly sized circuit protective device.
There is risk of equipment malfunction.
Verify all power, ground, and communications wires and
cables are properly terminated before applying power to the
product. Securely tighten all wire terminations.
Improper and / or loose wire and communications cable terminations will
cause product damage and malfunction.
Do not supply power to the unit until all electrical wiring,
controls wiring, piping, installation, and refrigerant system
evacuation are completed AND the commissioning agent has
provided authorization.
There is a risk of warranty loss, product damage, and / or complete
product loss.
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lighting strikes.
There is a risk of warranty loss, product damage, and / or complete
product loss.
Always use lock-out, tag-out procedures!
Ensure the electrical power is off and the disconnect is locked and
tagged prior to working on the Hydro Kit. There is a risk of warranty loss
and / or product damage.
Do not supply power to the unit until all electrical wiring,
controls wiring, piping, installation, and refrigerant system
evacuation are completed, AND the commissioning agent has
provided the authorization.
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lighting strikes.
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Turn the power off at the nearest disconnect before servicing
the equipment.
Electrical shock will cause physical injury or death.
Verify all power, ground, and communications wires and
cables are properly terminated before applying power to the
product. Securely tighten all wire terminations.
Improper and / or loose wire and communications cable terminations will
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Do not place a heater or other appliances near the power
cable.
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Do not allow water to access the electrical components.
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OPERATION AND MAINTENANCE
DANGER
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or submerged. Contact the supplier or an LG trained techni-
cian.
7KHUHLVULVNRI¿UHHOHFWULFVKRFNSK\VLFDOLQMXU\RUGHDWK
Use inert (nitrogen) gas when performing leak tests or air
purges. 'RQRWXVHFRPSUHVVHGDLUR[\JHQRUÀDPPDEOH
gases.
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death.
Check for refrigerant gas leaks. If a refrigerant gas leak is de-
tected, leave the room immediately!
5HIULJHUDQWJDVLQVXI¿FLHQWTXDQWLW\LQDQHQFORVHGDUHDFDQFDXVHVXI-
focation and death.
Do not operate unit or disconnect switch with wet hands.
7KHUHLVULVNRI¿UHHOHFWULFVKRFNSK\VLFDOLQMXU\RUGHDWK
Verify the piping system has been properly evacuated, and
the system’s refrigerant charge is correct before commis-
sioning and after any repair is made.
Improper system evacuation and / or an improper refrigerant charge will
cause product malfunction.
Periodically check that the frame and mounts are not damaged.
7KHUHLVDULVNRIWKHXQLWIDOOLQJDQGFDXVLQJD¿UHH[SORVLRQSK\VLFDO
injury, or death.
If abnormal sounds or smells, or smoke comes from unit,
shut off the power supply at the breaker / disconnect.
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8
MULTI V Hydro Kit Medium Temperature (K2) Installation Manual
SAFETY PRECAUTIONS
CAUTION
To avoid physical injury, use caution when cleaning or servic-
ing the air conditioner.
There is risk of electric shock, physical injury or death.
Use a stable ladder or stool when cleaning or maintaining the
unit.
A fall could occur, resulting in physical injury.
Do not allow water, dirt, or animals to enter the (Hydro Kit)
unit.
7KHUHLVULVNRI¿UHHOHFWULFVKRFNSK\VLFDOLQMXU\RUGHDWK
Do not operate the unit with the panel(s) or protective
FRYHUVUHPRYHGNHHS¿QJHUVDQGFORWKLQJDZD\IURPPRY-
ing parts.
The rotating, hot, cold, and high-voltage parts of the unit will cause
physical injury or death.
Do not touch the refrigerant piping during or after opera-
tion.
It will cause burns or frostbite.
Use a soft cloth to clean the unit. Do not use harsh deter-
gents, solvents, etc.
7KHUHLVULVNRI¿UHHOHFWULFVKRFNSK\VLFDOLQMXU\DQGRUGHDWK
Ensure that power cable cannot be pulled out or damaged
during operation.
7KHUHLVULVNRI¿UHHOHFWULFDOVKRFNSK\VLFDOLQMXU\DQGRUGHDWK
Do not place anything on the power cable.
7KHUHLVULVNRI¿UHHOHFWULFDOVKRFNSK\VLFDOLQMXU\DQGRUGHDWK
Do not disconnect the power supply during operation.
Do not disconnect the power supply of the Hydro Kit if op-
eration needs to be stopped. Always turn Hydro Kit off using
the wired remote controller.
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.LWDQGWKHRXWGRRUXQLWLVGLVFRQQHFWHG7KHUHLVULVNRI¿UHHOHFWULF
shock, physical injury and / or death.
Do not place a heater or other appliances near the power
cable.
7KHUHLVULVNRI¿UHHOHFWULFDOVKRFNSK\VLFDOLQMXU\DQGRUGHDWK
Turn the power off at the breaker or disconnect when clean-
ing, maintaining the unit, and before opening the unit to
check or repair electrical parts and wiring.
There is risk of electrical shock, physical injury, and / or death.
Periodically ventilate the unit when operating it together with
a stove, etc.
7KHUHLVULVNRI¿UHHOHFWULFDOVKRFNSK\VLFDOLQMXU\DQGRUGHDWK
If the unit is not used for long time, do not switch off the
power supply to the unit.
Water in the Hydro Kit will freeze, resulting in product malfunction or
damage.
Do not allow water, dirt, or animals to enter the (Hydro Kit)
unit.
There is risk of unit damage and operation failure.
Periodically check that the frame and mounts are not dam-
aged.
There is a risk of product damage.
Do not make substitutions if a refrigerant recharge is nec-
essary. Use the refrigerant listed on the nameplate of the unit.
,IDGLIIHUHQWUHIULJHUDQWLVXVHGRUDLUPL[HVZLWKRULJLQDOUHIULJHUDQWWKH
unit will malfunction and be damaged.
Use a soft cloth to clean. Do not use harsh detergents,
solvents, etc.
Any plastic parts of the unit will be damaged.

9
General Data
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Unit Nomenclature
ARN H42 3K2 A
Generation
4 = Fourth
Electrical Ratings
3 = 208–230V/60Hz/1Ph
42 = 42,000
96 = 96,000
Type
H = Hydro Kit
Family
ARN = Multi V Indoor Unit
(Refrigerant R410A)
K2 = Hydro Kit Water Heater Cooler
Feature
A = Basic
Nominal Cooling Capacity in Btu/h
Model
4
GENERAL DATA

10
MULTI V Hydro Kit Medium Temperature (K2) Installation Manual
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Table 1: Hydro Kit Model Numbers and Capacities.
Unit Model Number Capacity V, Hz, Phase
Hydro Kit Medium Temperature ARNH423K2A4 Cooling: 42,100 Btu/h; Heating: 47,200 Btu/h 208-230, 60, 1
ARNH963K2A4 Cooling: 95,900 Btu/h; Heating: 107,500 Btu/h 208-230, 60, 1
Introduction
Figure 1: Hydro Kit Medium Temperature.
Hydro Kits
This manual describes how to install the LG Hydro Kit, Medium Temperature units for Multi
V Variable Refrigerant Flow (VRF) heat pump and heat recovery systems. The table below
lists the available models. Refer to LG’s Hydro Kit Engineering Manual for complete detailed
engineering data and selection procedures.
Safety
Safety of personnel is the primary concern during all procedures. Read and understand the
safety summary at the front of this manual. Read and understand this installation procedure
before beginning installation. Use the appropriate tools and accessories during installation.
Plan the work and do not work alone, if possible. Know how to obtain emergency medical
and fire fighting assistance.
Installation Personnel
This equipment is intended for installation by personnel trained in the required construction, mechanical, electrical, and/or other disciplines.
• Connecting cable (power and control)
• Pipes - vapor line and liquid line, with insulation
• Condensate piping
• Level
• Screwdriver
• Electrical lineman pliers
• Electric drill
• Holesaw
• Drill
• Flaring tool set
• Tubing cutter
• Tube/pipe reamer
• Torque wrenches
• Allen wrench
• Gas-leak detector
• Thermometer
WARNING
• Installation work must be performed by trained personnel and in accordance with national wiring standards and all national, state, local or
other applicable codes. Improper installation can result in fire, electric shock, physical injury, or death.
• Install these unit(s) in the location(s) specified by the design engineer, HVAC system layout drawings and project specifications. Perform the
installation according to the procedures in this manual. Improper installation will result in injury to or death of personnel.
• Install these unit(s) in the location(s) specified by the design engineer, HVAC system layout drawings and project specifications. Perform the
installation according to the procedures in this manual. Become familiar with the unit’s components and connections, and the order of installa-
tion. Incorrect installation can degrade or prevent proper operation. Improper installation will result in equipment malfunction and / or property
damage.
• A more in-depth technical and performance information on these units is available in the Multi V™ Hydro Kit Engineering Manual at www.
lghvac.com.
Required Tools (field provided) Required Parts (field provided)
GENERAL DATA

11
General Data
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Parts (Factory Provided)
Table 2: Parts and Accessories Provided for Each Hydro Kit.
Description Quantity Image
Remote Controller and Cable 1
Indirect Hot Water Storage Tank Sensor
Well 1
Indirect Hot Water Storage Tank Sensor 1
Strainer 1
Independent Power Module 1
Conduit Mounting Plate 2
Screws for Remote Controller Installation 4
Screws for the Conduit Mounting Plate 4
Parts
OK
See Accessories on pages 18-20 for a list of compatible Hydro Kit optional LG and third-party accessories (sold separately).
GENERAL DATA

12
MULTI V Hydro Kit Medium Temperature (K2) Installation Manual
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R410A Refrigerant
R410A Refrigerant
R410A refrigerant has a higher operating pressure in comparison to R22 refrigerant. All piping system materials installed must have a higher
resisting pressure than the materials traditionally used in R22 systems.
R410A refrigerant is an azeotrope of R32 and R125, mixed at 50:50, so the ozone depletion potential (ODP) is 0.
WARNING
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• Because R410A is a combination of R32 and R125, the required additional refrigerant must be charged in its liquid state. If the refrigerant is
charged in its gaseous state, its composition changes and the system will not work properly.
•Do not heat piping more than necessary during installation. Piping will become soft and fail when pressurized.
•Do not use any piping that has not been approved for use in high-pressure refrigerant systems. Piping wall thickness must comply with
the applicable local, state, and federal codes for the 551 psi design pressure of R410A. Inadequate piping will fail when pressurized.
GENERAL DATA

13
General Data
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Features
Table 3: Hydro Kit Functions.
Features ARNH423K2A4 ARNH963K2A4
Unit Controller Based Functions
Self Diagnosis ¥¥
Auto Start ¥¥
Manual or Auto Restart1¥¥
Child Lock ¥¥
Group Control2¥¥
Timer (on/off) ¥¥
Timer (weekly) ¥¥
BMS Integration
Hydro Kit Wall Mounted Controller ¥¥
Network Solution (LGAP) ¥¥
Remote Enable/Disable via LG Dry Contact3PDRYCB300 / PDRYCB100 PDRYCB300 / PDRYCB100
Power Distribution Indicator (PDI) Interface ¥¥
Options
Remote Temperature Sensor3ZRTBS01 ZRTBS01
Solar Heating Circuit Interface3PHLLA PHLLA
Hydro Kit Based Functions
Hydronic Circuit Isolation ¥¥
Water Pump ON/ OFF Control ¥¥
Factory Mounted Flow Switch ¥¥
Conventional line voltage (208-230V)
Thermostat Interface2¥¥
Conventional 24 VAC Thermostat Interface2¥¥
Conventional Mechanical Thermostat Interface2¥¥
Wi-Fi Module3PWFMDD200 PWFMDD200
Indirect Tank Water Pre-Heating ¥¥
Third Party Solar Heating System Flow Control ¥¥
Storage Tank Heating Operation Timer ¥¥
Water Temperature Reset ¥¥
Overheating Protection ¥¥
Emergency Heating Operation ¥¥
Key: ¥$YDLODEOH
10DQXDOUHVWDUWLVQRWDYDLODEOHZKHQWKH+\GUR.LWLVFRQ¿JXUHGIRUFRQGLWLRQHGVSDFH
control, using a conventional thermostat.
2Each Hydro Kit unit group must be connected to the same outdoor unit. Hydro Kit units
within the same group must have the same DIP switch settings. The only DIP switch that
can differ is the group control setting switch, where one Hydro Kit will be the master and
the remaining Hydro Kit units will be slaves.
36ROGVHSDUDWHO\DQG¿HOGLQVWDOOHG
Hydro Kit Compatibility
ARNH-K2A4 Hydro Kit models are fully compatible with Multi V 5 (by March 1, 2019), Multi V Water IV (by March 1, 2019), and Multi V S
(except 24K unit; after December 2019). ARNH-K2A4 Hydro Kit models are compatible with Multi V IV Air-Source units, but without Gen4
features.
The ARNH-K2A4 Hydro Kits can be used with outdoor units manufactured after April 2019 communicating at a baud rate of 9,600 bps (Gen4 fea-
WXUHVDUHRSHUDWLRQDO%HIRUH$SULORXWGRRUXQLWVFRPPXQLFDWHDWDEDXGUDWHRIESV)RUPRUHLQIRUPDWLRQUHYLHZWKHVSHFL¿FRXWGRRU
unit Engineering and Installation Manuals, or contact your LG Sales Representative.
ARNH-K2A4 Hydro Kit models ARE NOT compatible with Multi V Mini, Multi V Plus II, Multi V Sync II, Multi V Space, Multi V Water II, Multi V
Water Mini, single-zone, or multi-zone products.
See pages 18 to 20 for a list of LG included, optional, and third-party accessories and controllers that can be used with the Hydro Kits.
GENERAL DATA

14
MULTI V Hydro Kit Medium Temperature (K2) Installation Manual
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Hydro Kit
ARNH423K2A4 ARNH963K2A4
Capacity Index 42 96
Cooling Mode Performance
Rated Capacity1(Btu/h) 42,100 95,900
Entering Water Temp Range (°F) 50 - 95 50 - 95
Leaving Water Temp Range (°F) 41 - 77 41 - 77
Indoor Air Temp Setpoint Range (°F) 64 - 86 64 - 86
Heating Mode Performance
Rated Capacity1(Btu/h) 47,200 107,500
Entering Water Temp Range (°F) 59 - 113 59 - 113
Leaving Water Temp Range (°F) 68 - 122 68 - 122
Indoor Air Temp Setpoint Range (°F) 64 - 86 64 - 86
Hot Water Tank Setpoint Range (°F) 86 - 122 86 - 122
Unit Data
Refrigerant Type R410A R410A
Refrigerant Control EEV EEV
Sound Pressure2 dB(A) Cooling/Heating 26 26
Net Unit Weight (lbs) 67 77
Shipping Weight (lbs) 79 89
Heat Rejected to Equipment Room (Btu/h) Negligible Negligible
Oil Type --- ---
Heat Exchanger
Material/Type 316 Stainless / Brazed Plate 316 Stainless / Brazed Plate
Rated Water Flow (GPM) 10.4 24.3
Rated Pressure Drop3(ft-wg) 13.7 23.1
Range of Flow (GPM) 5.3 - 10.4 8 - 24.3
Waterside Volume (US Gallons) 0.31 0.58
Water Side Design Pressure (psig) 640 640
Piping
Liquid Line (in, OD) 3/8 Braze 3/8 Braze
Vapor Line (in, OD) 5/8 Braze 7/8 Braze
Condensate Line (in, ID) 1-MPT 1-MPT
Water Inlet/Outlet (in, ID) 1-MPT 1-MPT
Table 4: +\GUR.LW6SHFL¿FDWLRQV7DEOH
6Seci¿cations
1All capacities are net with a Combination Ratio between 95–100%.
2Sound pressure levels are tested in an anechoic chamber under ISO Standard 3745.
3Water only (no antifreeze).
“The combination ratio range for dedicated use (all Hydro Kit units) is 50% - 100%. The
combination ratio range for mixed use (Hydro Kit mixed with indoor units) is 50% - 130%.
GENERAL DATA
Table 5: Hydro Kit Unit Electrical Data.
Model Voltage
Range MCA MOP Rated Amps (A)
Power Supply Power Input (kW)
Hz Volts Phase Cooling Heating
ARNH423K2A4 187-253 0.1 15 0.08 60 208-230 1 0.01 0.01
ARNH963K2A4
MCA = Minimum Circuit Ampacity MOP = Maximum Overcurrent Protection
Power wiring cable is field provided and must comply with the applicable local and national codes.
Electrical Data

15
General Data
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Dimensions —ARNH423K2A4, ARNH963K2A4
Unit: Inches (mm)
13 (330)
15-7/16 (392)
7/8 (22)
2-1/2
(63)
1-9/16 (40)
1-9/16
(40)
24-13/16 (631)
20-1/2 (520)
1-1/8 (28)
1. The unit must be installed in compliance with the installation manual.
2. Power to the unit must be grounded in accordance with all applicable state, local, and national regulations and codes.
3. All field-supplied electrical components and materials must comply all applicable state, local, national, and international
regulations and codes.
3D View
22-15/16 (582)
6-5/16 (161)
6-9/16 (167)
4-9/16 (116)
1-3/8 (35)
5-7/16 (138)
2-3/4 (70)
13-15/16 (354)
8-13/16 (224)
2-3/4 (70)
15-9/16 (396)
12-7/16 (316)
5-7/16 (138)
Power Supply
Cable Access
Hole Ø1-3/16
(Ø30)
2-1/2
(63)
Communication
Cable Access
Hole Ø1-3/16
(Ø30)
Drain
Pipe
Water
Inlet
Water
Outlet
Liquid
Pipe
Vapor
Pipe
GENERAL DATA

16
MULTI V Hydro Kit Medium Temperature (K2) Installation Manual
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Wiring Diagram —ARNH423K2A4, ARNH963K2A4
GENERAL DATA
11-19

17
General Data
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GENERAL DATA
Refrigerant Piping Diagram
Description PCB Socket Remarks
Vapor Line Temperature Sensor CN_PIPE/OUT Multi V refrigerant cycle
Liquid Line Temperature Sensor CN_PIPE/IN Multi V refrigerant cycle
Water Inlet Temperature Sensor CN_TH3 Water Inlet and Water Outlet sensors are connected to 4 pin
connector CN_TH3
Water Outlet Temperature Sensor
Table 6: Hydro Kit Piping Schematic Legend.
S
Wate
r
Inlet
Water
Outlet
Vapor
Line
Liquid
Line
Water Inlet
Temp. Sensor
Water Outlet
Temp. Sensor
Vapor Line
Temp. Sensor
Strainer
Strainer Electronic
Expansion Valve Plate Heat
Exchanger
: Cooling operation
: Heating operation
Liquid Line
Temp. Sensor
Bypass
Valve
Check
Valve
Flow
Switch
*Air Temperature sensor is an optional accessory and is sold separately based on design requirements.

18
MULTI V Hydro Kit Medium Temperature (K2) Installation Manual
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ACCESSORIES
Table 7: LG Included Accessories.
Table 8: LG Optional Accessories (sold separately).
Accessory Model No. Connection Description Use
Hydro Kit Unit Controller1 AKB74855309 CN-REMO Remote wall mounted controller Schedules, sets operational
parameters and monitors system
Standby Power Module1PRIPO C N - W R I T E &
CN-EEV
Backup power to close EEV valve if
power failure occurs during Multi V
defrost or oil return
Closes EEV if power outage
occurs during defrost or oil return
Indirect Water Storage
Tank Sensor Well MEG61846102 Indirect Heating
Tank Wall
Mounting for the indirect water tank
storage temperature sensor complete
with 39 feet of cable with plug
connector
Hot Water Storage Tank
Sensor1,2 EBG61325701 CN-TH4* Water storage tank sensor Monitors the Hydro Kit indirect
water storage tank temperature
Water Circuit Strainer3MJC57132402 Inlet Pipe 50 Mesh; install on inlet pipe to heat
exchanger
Keeps large particulate from
entering the heat exchanger
1Must use LG provided communications cable.
2Must have contacts rated for 208-230/60/1.
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*CN-TH4 connection can be used with either the Hot Water Storage Tank Sensor (LG
Included Accessory; see table above) OR the Solar Heating System Interface Kit with its
sensor (LG Optional Accessory; see table below). Both accessories CANNOT be con-
nected to CH-TH4 at the same time.
Accessory Model No. Connection Description Use
Wired Remote Extension
Cable1PZCWRC1 --- 33 foot extension cable assembly
Extends the length of the Hydro Kit
Unit Controller communications
cable beyond 33 feet (cannot be
used to extend tank sensor cable
length)
Solar Heating System
Interface Kit PHLLA CN-TH4 (Solar)*
Kit includes solar heating system
tank sensor/cable and tee fitting
sensor well.
Operates the Hydro Kit with a
water storage tank.
Ancillary (Solar) Heating
System Tank Replacement
Sensor1,2,3
MEG61846102 CN-TH4 (Solar)*
Solar heating water storage tank
sensor with 33 feet of cable and plug
connector
Monitors the solar heating
system water circuit temperature
Remote Temperature
Sensor ZRTBS01 CN-ROOM Sensor with 50 foot communications cable
and plug connector
Monitors and/or controls (optional)
the Hydro Kit based on air
temperature
Dry Contact PDRYCB300 /
PDRYCB100 CN-CC
Mounts inside the unit cabinet and
provides a external binary signal
control interface
Enables/disables operation from
an external signal
Wi-Fi Module PWFMDD200 CN-WF Connect for Wi-Fi capabilities Enables Wi-Fi capabilities.
1Must use LG provided communications cable.
2Field supplied thermal paste required.
3This sensor is included when ordering the PHLLA Solar Heating Interface Kit.
*CN-TH4 connection can be used with either the Hot Water Storage Tank Sensor (LG
Included Accessory; see table above) OR the Solar Heating System Interface Kit with its
sensor (LG Optional Accessory; see table below). Both accessories CANNOT be con-
nected to CH-TH4 at the same time.
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detailed terminal block information.

19
General Data
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Table 9: Third-Party Accessories (Sold Separately).
ACCESSORIES
Accessory Connections Voltage
Options Description Use
Hydro Kit Circuit Water Pump
Interlock TB-11,12 208-230/60/1
Hydro Kit water circuit circulating
pump interlock (use a field-provided
pilot relay)
Provides pump On / Off control
based on Hydro Kit control logic
Solar Heating Circuit Water
Pump Interlock1,2 TB-4,5 208-230/60/1
Solar heating circuit circulating pump
interlock (use a field-provided pilot
relay)
Provides pump On / Off control
based on Hydro Kit control logic.
208-230/60/1 Conventional
Thermostat3
TB-17,18,19,20
& Harness Plug
C to A
208-230/60/1
Single stage heating / cooling
manual
changeover
Monitors and / or controls (optional)
the Hydro Kit based on the
conditioned space temperature.
24 VAC Conventional
Thermostat3
TB-17,18,19,20
& Harness Plug
C to B
24 VAC Single stage heat/cool, must be
manual changeover model
Monitors and / or controls (optional)
the Hydro Kit based on the
conditioned space temperature.
Mechanical Thermostat
TB-17,18,19,20
& Harness Plug
C to A
--- Single stage heating only
Monitors and / or controls (optional)
the Hydro Kit based on the
conditioned space temperature.
Hydro Kit Circuit 3-Way
Diverting Valve TB-8,9,10 208-230/60/1 Valve (A) 208-230/60/1
3-wire SPDT
Diverting valve - circulates water to /
from the comfort conditioning
equipment and the Hydro kit water
storage tank.
Hydro Kit Circuit 2-Way
Isolation Valve TB-14,15,16 208-230/60/1 Valve (A) 208-230/60/1
2-wire NO or NC
Partial circuit water Isolation valve-
prevents condensate from forming
on floors containing in-floor heating
pipe while operating in the cooling
mode.
Solar Heating Circuit 3-Way
Diverting Valve TB-1,2,3 208-230/60/1 Valve (B) 208-230/60/1
3-wire SPDT
Diverting valve circulates water
to / from the ancillary heating circuit
and the Hydro kit heating circuit.
TB = Terminal Block NO = Normally Open
NC = Normally Closed SPDT = Single Pole Double Throw
1Must have contacts rated for 208-230/60/1.
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3Must have contacts rated for 24VAC.
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detailed terminal block information.

20
MULTI V Hydro Kit Medium Temperature (K2) Installation Manual
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Table 10: LG Optional Controllers (Sold Separately).
ACCESSORIES
Controller Model No.
LG MultiSITE™ Communications Manager PBACNBTR0A
AC Smart™ 5 PACS5A000
ACP 5 PACP5A000
ACP LonWorks®PLNWKB100