LG ARND DCR4 Series User manual

Variable Refrigerant Flow Split Compact DOAS
ARND***DCR4 Series
(900, 1,500 and 2,000 CFM)
LG SPLIT COMPACT DEDICATED
OUTDOOR AIR SYSTEM (DOAS)
INSTALLATION MANUAL

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
manuals, and forms, 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.

3
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.
TABLE OF CONTENTS
Safety Precautions .............................................................................4-7
Unit Nomenclature................................................................................. 8
Product Overview.............................................................................9-10
Interior Components............................................................................ 9
Electrical Components....................................................................... 10
General Data ................................................................................... 11-20
6SHFL¿FDWLRQV .................................................................................... 11
Electrical............................................................................................ 12
External Dimensions.....................................................................13-14
Wiring ...........................................................................................15-16
Refrigerant Flow - Cooling................................................................. 17
5HIULJHUDQW)ORZ'HKXPLGL¿FDWLRQ .................................................. 18
Refrigerant Flow - Heating................................................................. 19
Sound Power Levels.......................................................................... 20
Installation.......................................................................................21-25
Receiving........................................................................................... 21
Handling ............................................................................................ 21
Storage / Removing........................................................................... 21
Assemblies ........................................................................................ 21
$LUÀRZ$UUDQJHPHQW .......................................................................... 21
Location Selection ............................................................................. 22
Roughing In ....................................................................................... 22
Mounting Dimensions........................................................................ 23
'XFWZRUN&RQ¿JXUDWLRQ ..................................................................... 23
Service Clearances ........................................................................... 24
Piping Connections............................................................................ 24
Field-Installed Outdoor Air (OA) Filter ............................................... 25
Unit Piping.......................................................................................26-31
Refrigerant Safety ............................................................................. 26
Piping Handling ................................................................................. 26
Brazing Procedure............................................................................. 27
Pipe Support Location ...................................................................... 27
Insulate.............................................................................................. 27
Condensate Drain Connections......................................................... 28
Condensate Pump Connection.......................................................... 28
Unit Drain Information........................................................................ 28
Gravity Condensate Pipe Connection ............................................... 29
Installing the Condensate Drain Pipe ................................................ 29
Refrigerant Piping Installation............................................................ 30
Refrigerant System Eng., Allowable Pipe Length.............................. 30
Sample Layout................................................................................... 31
Conditional Applications .................................................................... 31
Electrical Information.....................................................................32-39
General Information........................................................................... 32
Separating Power Wiring and Communication Cables...................... 32
Power Wiring ..................................................................................... 33
Communication Cable Connections .................................................. 33
Terminal Connections ........................................................................ 33
3RZHU6XSSO\3RZHU:LULQJ6SHFL¿FDWLRQV..................................... 34
Communication Cable Specs. from ODU to DOAS........................... 35
Connection Procedure....................................................................... 36
Field Wiring........................................................................................ 37
Field-Mounted Sensors ................................................................38-39
Leak Pressure Check / Evacuation...............................................40-44
Leak / Pressure Check .................................................................40-41
Ambient Conditions ........................................................................... 41
Evacuation....................................................................................42-44
Charging Refrigerant........................................................................... 45
Refrigerant Charge Worksheet.......................................................... 45
6WDUWXS&RQÀJXUDWLRQ ......................................................................... 46
Checks Before Initial Startup............................................................. 46
Electric Preheater Accessory........................................................47-63
Safety Precautions .......................................................................47-49
Overview............................................................................................ 50
General Data ..................................................................................... 51
Dimensions...................................................................................52-53
Wiring Diagram.............................................................................54-55
Installation Procedure...................................................................56-58
Sequence Setting .........................................................................59-63
Controller ........................................................................................64-85
Overview............................................................................................ 64
(OHFWULFDO6SHFL¿FDWLRQV..................................................................... 64
Connecting to the Web UI ................................................................. 64
Service Password ............................................................................. 65
Startup Settings................................................................................. 65
IP Address ......................................................................................... 65
DOAS Unit Address Setting............................................................... 65
Central Controller Setting .................................................................. 66
AC Smart / ACP Controller Setup.................................................67-68
%06&RQ¿JXUDWLRQ ............................................................................ 69
Main Control Board Terminal Connections ....................................... 70
CAREL Control Board Terminal Connections .................................... 70
LG Control Board Layout................................................................... 71
UI Module .......................................................................................... 72
NTC Module ...................................................................................... 73
EEV Module....................................................................................... 74
Navigation.....................................................................................75-77
Software Update................................................................................ 78
BACnet / Modbus Object List .......................................................79-85
Installation Checklist......................................................................86-87

4
Split Compact Dedicated Outdoor Air 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. Incor-
rect operation due to ignoring any instructions will cause harm or damage. The level of seriousness is classified by the symbols below.
WARNING
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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explosion, which will result in electric shock, physical injury or death.
Installation, startup, and service must be performed by a
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Improper installation, adjustment, service, maintenance, or alteration
can cause personal injury or loss of life.
For replacement of an installed unit, always contact a
trained service provider.
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injury or death.
Periodically check that the unit is not damaged.
There is risk of explosion, which will result in physical injury, or death.
Replace all control box and panel covers.
If cover panels are not installed securely, dust, water and animals may
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injury or death.
Always check for system refrigerant leaks after the unit has
been installed or serviced.
Exposure to high concentration levels of refrigerant gas may lead to
illness or death.
Do not install the unit using defective hanging, attaching,
or mounting hardware.
There is risk of physical injury or death.
Wear protective gloves when handling equipment.
Sharp edges may cause personal injury.
Dispose of 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.
Do not install the unit in any location exposed to open
ÀDPHRUH[WUHPHKHDW Do not touch the unit with wet
hands.
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injury or death.
Install the unit considering the potential for earthquakes.
Improper installation may cause the unit to fall, resulting in physical
injury or death.
Do not change the settings of the protection devices.
If the pressure switch, thermal switch, or other protection device is short-
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E\/*DUHXVHGWKHUHLVULVNRI¿UHHOHFWULFVKRFNH[SORVLRQUHVXOWLQJLQ
physical injury or death.
If the unit 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 re-
frigerant leaks and safety limits are exceeded, it could result in personal
injuries or death from oxygen depletion.
(The name “ASHRAE” and the ASHRAE logo are trademarks of the American Society of
Heating, Refrigerating, and Air-Conditioning Engineers, Inc.)
INSTALLATION
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.
TABLE OF SYMBOLS
SAFETY PRECAUTIONS
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 information related to the current procedure.
This symbol indicates an action that should not be performed.
NOTE

5
Safety Precautions
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.
CAUTION
Be very careful when transporting the product.
•Do not attempt to carry the product without assistance.
• Some products use polypropylene bands for packaging. Do not use polypropylene bands to lift the unit.
• Suspend the unit from the base at specified positions.
• Support the unit at a minimum of four points to avoid slippage from rigging apparatus.
• Failure to follow these directions may result in minor or moderate physical injury.
INSTALLATION – CONTINUED
NOTE
Installation, startup, and service must be performed by a
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Improper installation, adjustment, service, maintenance, or alteration can
cause property damage.
Properly insulate all cold surfaces to prevent “sweating.”
Cold surfaces such as uninsulated pipe can generate condensate that
PD\GULSDQGFDXVHDVOLSSHU\ÀRRUFRQGLWLRQDQGRUZDWHUGDPDJHWR
walls.
When installing the unit in a hospital, mechanical room, or
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SURYLGHVXႈFLHQWSURWHFWLRQDJDLQVWHOHFWULFDOQRLVH
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
creating electrical noise that disturbs medical treatment or image broad-
casting.
Do not use the product for special purposes such as pre-
serving foods, works of art, wine coolers, or other precision
air conditioning applications.
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 become damaged.
Do not install the unit in a noise sensitive area.
When connecting refrigerant tubing, remember to allow for
pipe expansion.
Improper piping may cause refrigerant leaks and system malfunction.
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.
Periodically check that the outdoor unit is not damaged.
There is a risk of equipment damage.
Install the unit in a safe location where no one can step on or
fall onto it.
There is risk of unit and property damage.
Install the drain trap to ensure adequate drainage.
There is a risk of water leakage and property damage.
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unit.
There is risk of product failure.
Always check for system refrigerant leaks after the unit has
been installed or serviced.
Low refrigerant levels may cause product failure.
'XFWZRUNDQGRWKHULQVWDOOHGDLUÀRZUHVWULFWLRQGHYLFHVVXFK
DV¿OWHUVVKDOOQRWH[FHHGWKHUDWHGPD[LPXPVWDWLFSUHVVXUH
limits of the DOAS fan assembly.
Doing so may cause product malfunction.
OA Inlet (duct) should not be placed in an environment where
may be exposed to harmful volatile organic compounds
(VOCs), or in environments where there is improper air make
up or supply or inadequate ventilation.
SAFETY PRECAUTIONS

6
Split Compact Dedicated Outdoor Air 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
DANGER
High voltage electricity is required to operate this system.
Adhere to the National Electrical Codes and these
instructions when wiring.
Improper connections and inadequate grounding will cause accidental
injury or death.
Always ground the unit following local, state, and National
Electrical Codes.
7XUQWKHSRZHURႇDWWKHQHDUHVWGLVFRQQHFWEHIRUHVHUYLFLQJ
the equipment.
Electric shock will cause physical injury or death.
Properly size all circuit breakers or fuses.
7KHUHLVULVNRI¿UHHOHFWULFVKRFNH[SORVLRQUHVXOWLQJLQSK\VLFDOLQMXU\
or death.
WARNING
The information contained in this manual is intended for use
by an experienced, trained 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 injury or death.
Ensure the unit is connected to a dedicated power source
that provides adequate power.
If the power source capacity is inadequate or the electric work is not
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injury or death.
Refer to local, state, and federal codes, and use power wires
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:LUHVWKDWDUHWRRVPDOOPD\JHQHUDWHKHDWDQGFDXVHD¿UHUHVXOWLQJLQ
physical injury or death.
6HFXUHDOO¿HOGZLULQJFRQQHFWLRQVZLWKDSSURSULDWHZLUH
strain relief.
Improperly securing wires will create undue stress on equipment power
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in physical injury or death.
Properly tighten all power connections.
/RRVHZLULQJPD\RYHUKHDWDWFRQQHFWLRQSRLQWVFDXVLQJD¿UHUHVXOWLQJ
in physical injury or death.
NOTE
The information contained in this manual is intended for use
by an experienced, trained 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 or property damage.
Do not supply power to the unit until all electrical wiring,
controls wiring, piping, installation, and refrigerant system
evacuation are completed.
The system will malfunction.
SAFETY PRECAUTIONS

7
Safety Precautions
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.
OPERATION
DANGER
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or submerged.
7KHUHLVULVNRI¿UHHOHFWULFVKRFNUHVXOWLQJLQSK\VLFDOLQMXU\RUGHDWK
Use a dedicated power source for this product.
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Do not operate the disconnect switch with wet hands.
7KHUHLVULVNRI¿UHHOHFWULFVKRFNUHVXOWLQJLQSK\VLFDOLQMXU\RUGHDWK
Periodically verify the hanging bolts and other hardware
securing the unit have not deteriorated.
If the unit falls from its installed location, it will cause property damage,
product failure,resulting in physical injury or death.
If refrigerant gas leaks out, ventilate the area before operat-
ing the unit.
If the unit is mounted in an enclosed, low-lying, or poorly ventilated area
DQGWKHV\VWHPGHYHORSVDUHIULJHUDQWOHDNLWZLOOFDXVH¿UHHOHFWULF
shock, explosion, resulting in physical injury or death.
NOTE
&OHDQXSWKHVLWHDIWHULQVWDOODWLRQLV¿QLVKHGDQGFKHFN
that no metal scraps, screws, or bits of wiring have been left
inside or surrounding the unit.
Do not use this equipment in mission critical or special-
purpose applications such as preserving foods, works of art,
wine coolers or refrigeration.
Provide power to the compressor crankcase heaters to ap-
plication outdoor units 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.
Do not operate the unit with the panel(s) or protective
FRYHUVUHPRYHGNHHS¿QJHUVDQGFORWKLQJDZD\IURP
moving parts.
Non-secured covers can result in equipment malfunction due to dust or
water.
Do not block the inlet or outlet.
Unit may malfunction.
Securely attach the electrical cover to the unit.
1RQVHFXUHGFRYHUVFDQUHVXOWLQ¿UHGXHWRGXVWRUZDWHULQWKHVHUYLFH
panel.
Periodically verify the equipment mounting hardware has not
deteriorated.
If the base collapses, the unit could fall and cause property damage or
product failure.
Do not allow water, dirt, or animals to enter the unit.
There is risk of unit failure.
'RQRWWXUQRႇWKHPDLQSRZHUVZLWFKDIWHURSHUDWLRQKDV
been stopped.
:DLWDWOHDVW¿YHPLQXWHVEHIRUHWXUQLQJRIIWKHPDLQSRZHUVZLWFK
otherwise it will result in product malfunction.
WARNING
Do not allow water, dirt, or animals to enter the unit.
7KHUHLVULVNRI¿UHHOHFWULFVKRFNUHVXOWLQJLQSK\VLFDOLQMXU\RUGHDWK
Do not touch refrigerant piping during or after operation.
It can cause burns or frostbite.
Do not operate the unit with the panel(s) or protective
FRYHUVUHPRYHGNHHS¿QJHUVDQGFORWKLQJDZD\IURP
moving parts.
The rotating, hot, cold, and high-voltage parts of the unit can cause
physical injury or death.
Periodically check power cable and connection for damage.
Cable must be replaced by the manufacturer, its service agent, or similar
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Securely attach the electrical cover to the unit.
Non-secured electrical covers can result in burns or electric shock due to
dust or water in the service panel.
Ensure no power is connected to the unit other than as
directed in this manual. Remove power from the unit before
removing or servicing the unit.
7KHUHLVULVNRIXQLWIDLOXUH¿UHHOHFWULFVKRFNUHVXOWLQJLQSK\VLFDOLQMXU\
or death.
CAUTION
To avoid physical injury, use caution when cleaning or servicing the unit.
SAFETY PRECAUTIONS

8
Split Compact Dedicated Outdoor Air 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 NOMENCLATURE
ARN D20 3DC
Air Flow Rate (CFM)
90 = 900 CFM
15 = 1,500 CFM
20 = 2,000 CFM
Type
D = Dedicated Outdoor Air System (DOAS)
Family
ARN = Multi V Indoor Unit
R410A Refrigerant
4
Generation
4 = Fourth
Chassis
DB = Type B (Rooftop DOAS)
DC = Type C (Compact DOAS)
R
Energy Recovery Wheel
R = Without Energy Recovery Wheel
Electrical Ratings
U = 208-230V / 460V, 60Hz, 3 Phase
3 = 208-220V, 60Hz, 1 Phase

9
Product Overview
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.
PRODUCT OVERVIEW
Interior Components
Top panel can be removed to access the 3D Plug Fan.

10
Split Compact Dedicated Outdoor Air 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.
Electrical Components
Table 1: Electrical Components Legend.
Electrical Component No. Description
1CAREL®Controller
2 Main Module
3 UI Module
4 NTC Module
5 Main Coil EEV Module
6 Reheat Coil EEV Module
7 Heat Recovery Unit PCB
8SMPS
9 Transformer
10 RS-485 1
11 RS-485 2
12 Relay 1
13 Relay 2
PRODUCT OVERVIEW
The CAREL®name and logo are registered trademarks and distinctive marks of CAREL
INDUSTRIES S.p.A.