LG AR-DR11-08A User manual

ROOFTOP DEDICATED
OUTDOOR AIR SYSTEMS (DOAS)
INSTALLATION AND OPERATION MANUAL
Base Rooftop DOAS
650 to 12,000 CFM
Energy Recovery Wheel Rooftop DOAS
650 to 18,000 CFM

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
General Data ........................................................................................................................................................................................................... 11-14
Refrigerant Safety........................................................................................................................................................................................................ 15
Installation............................................................................................................................................................................................................... 16-22
Lifting Guidelines........................................................................................................................................................................................................... 16
Clearances .................................................................................................................................................................................................................... 17
Installation Location.................................................................................................................................................................................................. 18-22
Outdoor Air Hood Assembly ................................................................................................................................................................................. 23-28
Standard Intake Hood w/Bird Screen Assembly....................................................................................................................................................... 23-26
Intake Hood w/Aluminum Filter Assembly ................................................................................................................................................................ 27-28
Duct and Condensate Drain Connections................................................................................................................................................................. 29
Access Holes ............................................................................................................................................................................................................... 30
Electrical Connections........................................................................................................................................................................................... 31-32
Gas Heater Connection and Startup..................................................................................................................................................................... 33-39
Refrigeration System Startup................................................................................................................................................................................ 39-42
Energy Recovery Wheel (AR-DE Models) ............................................................................................................................................................ 43-47
Controller .............................................................................................................................................................................................................. 48-105
Overview................................................................................................................................................................................................................... 48-59
AC Smart Setup........................................................................................................................................................................................................ 60-62
Sequences of Operation........................................................................................................................................................................................... 63-74
Set-Points Data Tables ............................................................................................................................................................................................. 75-81
Network Settings Data Tables................................................................................................................................................................................... 82-86
Alarm Data................................................................................................................................................................................................................ 87-90
BACnet and MODBUS Points ................................................................................................................................................................................ 91-102
Unit Status Modes ....................................................................................................................................................................................................... 103
LonTalk Points ...................................................................................................................................................................................................... 104-105
Troubleshooting ................................................................................................................................................................................................. 106-110
Maintenance.........................................................................................................................................................................................................111-114
Startup Documentation.......................................................................................................................................................................................114-118

4
Rooftop 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.
Improper installation by the user may result in water leakage, re,
explosion, electric shock, physical injury or death.
Installation, startup, and service must be performed by a
qualied installer, service agency, or gas supplier.
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.
There is risk of re, electric shock, explosion, and physical injury or
death.
Periodically check that the unit is not damaged.
There is risk of explosion, physical injury, or death.
Replace all control box and panel covers.
If cover panels are not installed securely, dust, water and animals may
enter the unit, causing re, electric shock, and physical 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
ame or extreme heat. Do not touch the unit with wet
hands.
There is risk of re, electric shock, explosion, and physical 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
shorted and forced to operate improperly, or parts other than those spec-
ied by LG are used, there is risk of re, electric shock, explosion, and
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.
INSTALLATION
DANGER
Don’t use or store ammable gas or combustibles near the unit.
There is risk of re, explosion, and physical injury or death.
TABLE OF SYMBOLS
DANGER
This symbol indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.
WARNING
This symbol indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.
CAUTION
This symbol indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury.
This symbol indicates situations that may result in equipment or property damage accidents only.
This symbol indicates an action that should not be performed.
SAFETY PRECAUTIONS

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
Installation, startup, and service must be performed by a
qualied installer, service agency, or gas supplier.
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
may drip and cause a slippery oor condition and/or water damage to
walls.
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.
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 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.
Don’t store or use ammable gas / combustibles near the
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.
Ductwork and other installed airow restriction devices such
as lters shall not exceed the rated maximum static pressure
limits of the DOAS fan assembly.
Doing so may cause product malfunction.
SAFETY PRECAUTIONS

6
Rooftop 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 can cause accidental
injury or death.
Always ground the unit following local, state, and National
Electrical Codes.
Turn the power o󰀨 at the nearest disconnect before servicing
the equipment.
Electric shock can cause physical injury or death.
Properly size all circuit breakers or fuses.
There is risk of re, electric shock, explosion, physical injury 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
performed properly, it may result in re, electric shock, physical injury or
death.
Refer to local, state, and federal codes, and use power wires
of su󰀩cient current capacity and rating.
Wires that are too small may generate heat and cause a re and physi-
cal injury or death.
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
physical injury or death.
Properly tighten all power connections.
Loose wiring may overheat at connection points, causing a re, physical
injury or death.
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.
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
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 power source 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.
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
and the system develops a refrigerant leak, it may cause re, electric
shock, explosion, physical injury or death.
Clean up the site after installation is nished, and check
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 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 block the inlet or outlet.
Unit may malfunction.
Securely attach the electrical cover to the indoor unit.
Non-secured covers can result in re due to dust or water in the service
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.
WARNING
Do not allow water, dirt, or animals to enter the unit.
There is risk of re, electric shock, physical injury or death.
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
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.
Periodically check power cable and connection for damage.
Cable must be replaced by the manufacturer, its service agent, or similar
qualied persons in order to avoid physical injury and / or electric shock.
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.
There is risk of unit failure, re, electric shock, physical injury or death.
CAUTION
To avoid physical injury, use caution when cleaning or servicing the air conditioner.
SAFETY PRECAUTIONS

8
Rooftop 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
AR D R 11 05
Cooling Capacity
Chassis Size
11 = 110
21 = 210
31 = 310
35 = 352
ERV Option
R = Base Unit
E = Energy Recovery Wheel
Type
D = Dedicated Outdoor Air System (DOAS)
Family
AR = Air-Source Packaged Rooftop Unit,
R410A Refrigerant
A
Series
A = First Series
05 = 5 Tons
08 = 8 Tons
10 = 10 Tons
13 = 13 Tons
16 = 16 Tons
18 = 18 Tons
20 = 20 Tons
25 = 25 Tons
30 = 30 Tons
40 = 40 Tons
50 = 50 Tons
60 = 60 Tons
70 = 70 Tons

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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.
PRODUCT OVERVIEW
Base Rooftop DOAS AR-DR Models
Energy Recovery Wheel Rooftop DOAS AR-DE Models
Refrigerant Access
Furnace
Electrical Panel Supply Air
Supply Fan Return Air
Outside Air Damper
DX Coil
Refrigerant Access
Furnace
Electrical Panel
Area Supply Air
Supply Fan Return Air
Outside Air Damper
DX Coil
Energy Recovery
Exhaust Fan

10
Rooftop 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.
PRODUCT OVERVIEW
Electrical Panel View
Other components may be present depending on the chosen options.
Field Wiring Terminal Blocks
Compressor
Overloads and
Contactors
Phase Volt
Monitor
Digital Scroll
Compressor
Control Board
Control Relays
Transformers
DisconnectCAREL Controller Supply Fan VFD Condenser Fan VFD

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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
Table 1: Base Rooftop DOAS.
Base Rooftop DOAS
• Capacity data above will change if entering air temperatures, leaving air temperatures (LAT), or airflow rates are varied.
• Take appropriate actions at the end of HVAC equipment life to recover, recycle, reclaim or destroy R410A refrigerant according to applicable
regulations (40 CFR Part 82, Subpart F) under section 608 of CAA.
Model No. AR-DR11-
05A
AR-DR11-
08A
AR-DR11-
10A
AR-DR21-
10A
AR-DR21-
13A
AR-DR21-
16A
AR-DR21-
18A
AR-DR21-
20A
Design Airflow (CFM) 1,000 1,400 1,800 2,000 2,400 2,900 3,300 3,700
ESP (in. wg) 1.92222222
Entering Air Summer
DB / WB (°F) 95 / 75 95 / 75 95 / 75 95 / 75 95 / 75 95 / 75 95 / 75 95 / 75
Entering Air Winter
DB (°F) 00000000
Cooling Performance
Coil LAT DB / WB (°F) 55.4 / 55.1 54.8 / 54.5 54.8/54.5 55.8 / 55.5 55.2 / 55.0 55.4 / 55.1 55.3 / 55.0 54.7 / 54.3
Unit LAT DB / WB (°F) 77.5 / 63.4 78.8 / 63.5 75 / 62.1 77.7 / 63.7 78 / 63.5 77.9 / 63.5 78.4 / 63.6 77.4 / 62.9
Total Cooling
Capacity (MBH) 70.3 100.9 129.8 138.1 169.5 203.9 232.9 267.8
Sensible Cooling
Capacity (MBH) 43.6 62 79.7 86.4 105.2 126.5 144.2 164.1
Hot Gas Reheat Coil
Capacity (MBH) 21 32 34.9 41.7 50.6 62.2 73.8 82.3
Evaporator Coil
Depth(Rows) 66666666
No. of Compressors 11122222
Compressor Type(s) Digital Scroll Digital Scroll Digital scroll Digital Scroll /
Fixed Speed
Digital Scroll /
Fixed Speed
Digital Scroll /
Fixed Speed
Digital Scroll /
Fixed Speed
Digital Scroll /
Fixed Speed
Refrigerant Charge
(lbs.) 10.7 15.6 20.2 17.8 23.9 29.9 33.2 36.4
Heating
Fuel Natural Gas Natural Gas Natural Gas Natural Gas Natural Gas Natural Gas Natural Gas Natural Gas
Capacity Input (MBH) 100 150 200 200 250 300 300 350
Capacity Output (MBH) 80 120 160 160 200 240 240 280
LAT (°F) 73.7 79 81.9 73.7 76.8 76.3 67 69.7
Turndown Type Standard Standard Standard Standard Standard Standard Standard Standard
Turndown Ratio 4:1 4:1 4:1 4:1 4:1 4:1 4:1 4:1
Supply Fan Data
Fan Quantity 11111111
Wheel Diameter (in.) 12 14 16 16 18 18 18 18
Wheel Speed (RPM) 2,343 2,095 2,880 1,942 1,707 1,746 1,810 1,850
Motor HP 1 1.5 1.5 2 3 3 3 3
Configuration
Outdoor Air Intake End End End End End End End End
Supply Air Discharge Bottom Bottom Bottom Bottom Bottom Bottom Bottom Bottom
Weight (lbs.) 1,771 1,832 1,969 2,414 2,546 2,708 2,801 2,955
Filtration
Hood None None None None None None None None
Supply 2″ MERV 8 2″ MERV 8 2″ MERV 8 2″ MERV 8 2" MERV 8 2" MERV 8 2" MERV 8 2" MERV 8

12
Rooftop 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.
GENERAL DATA
Base Rooftop DOAS
Table 2: Base Rooftop DOAS, continued.
• Capacity data above will change if entering air temperatures, leaving air temperatures (LAT), or airflow rates are varied.
• Take appropriate actions at the end of HVAC equipment life to recover, recycle, reclaim or destroy R410A refrigerant according to applicable
regulations (40 CFR Part 82, Subpart F) under section 608 of CAA.
Model No. AR-DR21-
25A
AR-DR31-
25A
AR-DR31-
30A
AR-DR31-
35A
AR-DR31-
40A
AR-DR35-
30A
AR-DR35-
40A
AR-DR35-
50A
AR-DR35-
60A
AR-DR35-
70A
Design Airflow
(CFM) 4,200 4,500 5,300 5,600 7,000 5,200 6,700 8,500 9,800 12,000
ESP (in. wg) 2 2 2 2 2.5 2.5 2 2 2 3
Entering Air
Summer DB/WB (°F) 95 / 75 95 / 75 95 / 75 95 / 75 95 / 75 95 / 75 95 / 75 95 / 75 95 / 75 95 / 75
Entering Air
Winter DB (°F) 0000000000
Cooling Performance
Coil LAT DB / WB
(°F) 54.5 / 54.2 55.3 / 54.9 54.9 / 54.5 54.3 / 54.1 54.8 / 54.5 54.8 / 54.4 54.9 / 54.5 54.8 / 54.4 54.7 / 54.5 54.2 / 53.9
Unit LAT DB / WB
(°F) 76.6 / 62.6 76.6 / 63.0 76.5 / 62.7 77.1 / 62.7 77.2 / 63 82.1 / 64.6 78.6 / 63.5 76.3 / 62.6 74.6 / 62.1 72.8 / 61.1
Total Cooling
Capacity (MBH) 305.3 318.2 381.3 409.3 503.1 375 482 612.9 705.1 882.5
Sensible Cooling
Capacity (MBH) 187.2 196.8 234.1 251.1 310.1 229.9 295.8 375.8 434.6 538.6
Hot Gas Reheat
Coil Capacity (MBH) 86.4 92 107.3 121.2 141.9 136.7 155.1 171.5 182.8 199.9
Evaporator Coil
Depth (Rows) 6666666666
No. of Compressors 2444444444
Compressor
Type(s)
Digital Scroll/
Fixed Speed 2 Digital Scroll / 2 Fixed Speed
Refrigerant
Charge (lbs.) 39.7 43.9 50.2 56.5 58.2 75.3 90.5 104.1 111.5 116.8
Heating
Fuel Natural Gas Natural Gas Natural Gas Natural Gas Natural Gas Natural Gas Natural Gas Natural Gas Natural Gas Natural Gas
Capacity Input
(MBH) 400 400 500 500 700 600 600 800 1,000 1,200
Capacity Output
(MBH) 320 320 400 400 560 480 480 640 800 960
LAT (°F) 70.2 65.5 69.6 65.8 73.7 85.1 66 69.4 75.2 73.7
Turndown Type Standard Standard Standard Standard Standard High High High High High
Turndown Ratio 4:1 4:1 4:1 4:1 4:1 10:1 10:1 10:1 10:1 10:1
Supply Fan Data
Fan Quantity 1222222322
Wheel Dia.(in.) 18 16 18 18 18 15 16 15 18 20
Wheel Speed (RPM) 1,952 1,959 1,692 1,728 2,560 2,345 2,083 2,299 2,012 2,002
Motor HP 5233553357.5
Configuration
Outdoor Air Intake End End End End End End End End End End
Supply Air Discharge Bottom Bottom Bottom Bottom Bottom Bottom Bottom Bottom Bottom Bottom
Weight (lbs.) 3,148 3,746 4,039 4,225 4,432 6,817 7,168 7,805 8,077 8,267
Filtration
Hood None None None None None None None None None None
Supply 2″ MERV 8 2″ MERV 8 2″ MERV 8 2″ MERV 8 2" MERV 8 2" MERV 8 2″ MERV 8 2″ MERV 8 2″ MERV 8 2″ MERV 8

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.
Table 3: Energy Recovery Wheel Rooftop DOAS.
GENERAL DATA
Energy Recovery Wheel Rooftop DOAS
• Capacity data above will change if entering air temperatures, leaving air temperatures (LAT), or airflow rates are varied.
• Take appropriate actions at the end of HVAC equipment life to recover, recycle, reclaim or destroy R410A refrigerant according to applicable
regulations (40 CFR Part 82, Subpart F) under section 608 of CAA.
Model No. AR-DE11-
05A
AR-DE11-
08A
AR-DE11-
10A
AR-DE21-
10A
AR-DE21-
13A
AR-DE21-
16A
AR-DE21-
18A
AR-DE21-
20A
AR-DE21-
25A
Design Airflow (CFM) 1,900 2,400 3,000 3,600 4,200 4,900 5,500 6,000 6,600
ESP (in. wg) 1 2 1.8 2 1.6 1.6 1.6 1.6 1.5
Entering Air Summer DB / WB
(°F) 95 / 75 95 / 75 95 / 75 95 / 75 95 / 75 95 / 75 95 / 75 95 / 75 95 / 75
Entering Air Winter DB (°F) 000000000
Cooling Performance
Coil EAT DB / WB (°F) 79.6 / 66.1 80.5 / 66.7 81.6 / 67.3 79.5 / 66 80 / 66.4 80.6 / 66.8 81.1 / 67.1 81.6 / 67.3 82.1 / 67.7
Coil LAT DB / WB (°F) 55.2 / 54.6 54.2 / 53.7 54.5 / 53.9 54.6 / 54.2 54.4 / 53.9 54.5 / 54 54.6 / 54.1 54.1 / 53.5 53.9 / 53.4
Unit LAT DB / WB (°F) 70.6 / 60.7 74.5 / 61.6 71.5 / 60.7 71.3 / 60.7 70.9 / 60.4 73.9 / 61.6 72.9 / 61.3 73.5 / 61.2 71.9 / 60.6
Total Cooling Capacity (MBH) 68.8 98.4 127.3 133.3 164.5 198.3 227.3 261.5 299
Sensible Cooling Capacity
(MBH) 50.8 69.4 89.2 98.3 118.2 140.4 159.9 181.1 204.5
Hot Gas Reheat Coil Capacity
(MBH) 25.8 38.7 41.1 51 61 74.7 88.2 97.5 100.8
Evaporator Coil Depth (Rows) 666666666
Number of Compressors 111222222
Compressor Type(s) Digital Scroll Digital Scroll / Fixed Speed
Refrigerant Charge (lbs.) 10.7 15.6 20.2 17.8 23.9 29.9 33.2 36.4 39.7
Heating
Fuel Natural Gas Natural Gas Natural Gas Natural Gas Natural Gas Natural Gas Natural Gas Natural Gas Natural Gas
Capacity Input (MBH) 100 100 100 200 200 200 200 200 200
Capacity Output (MBH) 80 80 80 160 160 160 160 160 160
LAT (°F) 92.9 81.4 71.1 95.6 87.7 80.4 75.1 71.3 67
Turndown Type Standard Standard Standard Standard Standard Standard Standard Standard Standard
Turndown Ratio 4:1 4:1 4:1 4:1 4:1 4:1 4:1 4:1 4:1
Fan Data
Supply Fan Quantity 111112121
Supply Fan Wheel Diameter (in.) 14 16 18 18 18 16 18 18 20
Supply Fan Wheel Speed (RPM) 2,383 2,366 2,140 2,163 2,195 2,386 2,366 2,145 2,119
Supply Fan Motor HP 2 5 5 5 5 5 7.5 5 10
Exhaust Fan Quantity 111122222
Exhaust Fan Wheel Diameter
(in.) 14 18 18 18 16 16 18 18 18
Exhaust Fan Wheel Speed
(RPM) 1,852 1,695 1,757 1,781 1,796 1,900 1,669 1,726 1,775
Exhaust Fan Motor HP 13331.52333
Configuration
Outdoor Air Intake End End End End End End End End End
Supply Air Discharge Bottom Bottom Bottom Bottom Bottom Bottom Bottom Bottom Bottom
Return Air Opening Bottom Bottom Bottom Bottom Bottom Bottom Bottom Bottom Bottom
Weight (lbs.) 2,618 2,618 2,746 3,447 3,623 3,919 3,986 4,133 4,247
Filtration
Hood 1″ Aluminum 1″ Aluminum 1″ Aluminum 1″ Aluminum 1″ Aluminum 1″ Aluminum 1″ Aluminum 1″ Aluminum 1″ Aluminum
Supply 2″ MERV 8 2″ MERV 8 2″ MERV 8 2″ MERV 8 2" MERV 8 2" MERV 8 2" MERV 8 2" MERV 8 2” MERV 8

14
Rooftop 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.
Table 4: Energy Recovery Wheel Rooftop DOAS, continued.
GENERAL DATA
Energy Recovery Wheel Rooftop DOAS
• Capacity data above will change if entering air temperatures, leaving air temperatures (LAT), or airflow rates are varied.
• Take appropriate actions at the end of HVAC equipment life to recover, recycle, reclaim or destroy R410A refrigerant according to applicable
regulations (40 CFR Part 82, Subpart F) under section 608 of CAA.
Model No. AR-DE31-
25A
AR-DE31-
30A
AR-DE31-
35A
AR-DE31-
40A
AR-DE35-
30A
AR-DE35-
40A
AR-DE35-
50A
AR-DE35-
60A
AR-DE35-
70A
Design Airflow (CFM) 7,500 8,500 9,200 10,000 9,400 11,600 13,500 16,000 18,000
ESP (in. wg) 2 2 2 2 1.4 1.4 1.4 3 3
Entering Air
Summer DB/WB (°F) 95 / 75 95 / 75 95/75 95/75 95 / 75 95 / 75 95 / 75 95 / 75 95 / 75
Entering Air Winter
DB (°F) 000000000
Cooling Performance
Coil EAT DB/WB (°F) 81.8 / 67.5 82.5 / 67.9 83/68.2 83.6/68.6 79.9 / 66.3 80.8 / 66.9 81.5 / 67.3 82.4 / 67.9 83.1 / 68.3
Coil LAT DB/WB (°F) 55.1 / 54.5 54.7 / 54.1 54.9/54.5 53.7/53.3 54.6 / 53.8 54.7 / 54 53.9 / 53.3 54.8 / 54.3 53.7 / 53.2
Unit LAT DB/WB (°F) 72 / 61.1 72.8 / 61.2 73.2/61.6 72.5/60.7 74.4 / 61.7 73.2 / 61.3 70.8 / 60.1 72 / 61.1 69.8 / 59.7
Total Cooling
Capacity (MBH) 312.4 375.2 406.5 489.7 367.2 473.1 596.9 696.2 866.2
Sensible Cooling
Capacity (MBH) 220.1 259.2 284.1 328.6 261.4 332.7 409.1 485.6 581.3
Hot Gas Reheat
Coil Capacity (MBH) 108.8 125.1 141.4 162.1 173.7 191.7 205.9 217.1 231.4
Evaporator Coil
Depth (Rows) 666666666
No. of Compressors 444444444
Compressor Type(s) 2 Digital Scroll / 2 Fixed Speed
Refrig. Charge (lbs.) 43.9 50.2 56.5 58.2 75.3 90.5 104.1 111.5 116.8
Heating
Fuel Natural Gas Natural Gas Natural Gas Natural Gas Natural Gas Natural Gas Natural Gas Natural Gas Natural Gas
Capacity Input (MBH) 400 400 400 400 600 600 600 600 800
Capacity Output (MBH) 320 320 320 320 480 480 480 480 640
LAT (°F) 85.1 77.8 73.4 68.6 99.9 87.8 79.8 71.2 73.6
Turndown Type Standard Standard Standard Standard High High High High High
Turndown Ratio 4:1 4:1 4:1 4:1 10:1 10:1 10:1 10:1 10:1
Fan Data
Supply Fan Qty. 211122222
Supply Fan Wheel
Diameter (in.) 18 24 24 24 18 18 20 24 24
Supply Fan Wheel
Speed (RPM) 2,203 1,669 1,805 1,869 2,094 2,366 2,038 1,937 1,915
Supply Fan Motor HP 5 15 5 15 5 7.5 7.5 15 15
Exhaust Fan Qty. 222223222
Exhaust Fan Wheel
Diameter (in.) 18 18 18 18 18 18 20 24 24
Exhaust Fan Wheel
Speed (RPM) 1,895 2,009 2,197 2,308 1,812 1,735 1,791 1,545 1,651
Exhaust Fan Motor HP 55553321010
Configuration
Outdoor Air Intake End End End End End End End End End
Supply Air
Discharge Bottom Bottom Bottom Bottom Bottom Bottom Bottom Bottom Bottom
Return Air Opening Bottom Bottom Bottom Bottom Bottom Bottom Bottom Bottom Bottom
Weight (lbs.) 5,204 5,421 5,687 5,724 9,339 9,857 10,180 10,670 10,772
Filtration
Hood None 1″ Aluminum 1″ Aluminum 1″ Aluminum 1″ Aluminum 1″ Aluminum 1″ Aluminum 1″ Aluminum None None
Supply 2″ MERV 8 2″ MERV 8 2″ MERV 8 2″ MERV 8 2″ MERV 8 2″ MERV 8 2″ MERV 8 2″ MERV 8 2″ MERV 8

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.
REFRIGERANT SAFETY
WARNING
Installation, startup, and service must be performed by a qualied installer, service agency, or gas supplier.
Improper installation, adjustment, service, maintenance, or alteration can cause personal injury or loss of life.
The customer must provide proper equipment and fully trained installers to follow local safety requirements when receiving, installing, or
servicing equipment. Consult all local building, electrical, occupational safety, and gas codes.
Lock out all power supplies before servicing the unit to prevent accidental startup. All fan blades should be secured to prevent wind rotation.
Remove any restrictive device before restoring power.
The Clean Air Act of 1990 bans the intentional venting of refrigerant (CFC and HCFC) as of July 1, 1992. Approved methods of recovery,
recycling, or reclaiming refrigerant must be followed. Fines and / or incarceration may be levied for non-compliance.
ASHRAE Standards 15-2101 and 34-2010 offer guidelines that address refrigerant safety and the maximum allowable concentration of
refrigerant in an occupied space. Refrigerant will dissipate into the atmosphere, but a certain volume of air is required for this to occur safely.
For R410A refrigerant, the maximum allowable concentration of refrigerant is twenty-six (26) lbs. per 1,000 cubic feet of an occupied space.
Institutional buildings allow half of that concentration.
ASHRAE Standards 15 and 34 assume that if a system develops a leak, its entire refrigerant charge will dump into the area where the leak
occurs. To meet ASHRAE Standards 15 and 34, calculate the refrigerant concentration that may occur in the smallest room volume on the
system, and compare the results to the maximum allowable concentration number. Also, consult state and local codes in regards to refriger-
ant safety.
Installation, startup, and service must be performed by a qualied installer, service agency, or gas supplier.
Improper installation, adjustment, service, maintenance, or alteration can cause property damage.
WARNING
Verify the maximum refrigerant concentration level for spaces served by DOAS meets the concentration limit for the application.

16
Rooftop 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.
INSTALLATION
Lifting Guidelines
Lifting Guidelines
• Crane lift only.
• Preparation of curb and roof openings must be completed before lifting the unit to the roof.
• Units have integral U-bolt lifting lugs located on the exterior at the top. ALL lifting lugs must be used during lifting.
• The cables or chains must be at least double the length of the unit to prevent stress on the structure.
• Spreader bars are required for lifting the unit to prevent damage to the cabinet.
• Chain angle at point of lug connection must never exceed 20° from vertical in any direction.
• Always test-lift the unit to check for proper balance and rigging before hoisting to desired location.
• Do not use belt-type slings.
• Do not twist the lines holding the unit while it is being lifted.
• Failure to follow proper instructions could result in serious injury or death.
• Use the appropriate crane equipment to transport each unit; ensure the crane is capable of supporting the weights listed in the specification
tables. If the crane is not properly secured, it may result in an accident that causes physical injury or death.
• Never lift the units in windy conditions.
• Wear protective gloves when handling equipment. Sharp edges may cause personal injury.
• Tear apart and throw away plastic packaging so that children may not play with them and risk suffocation and death.
WARNING
Failure to follow proper instructions could result in property damage.
For DR and DE11-XX, 21-XX, 31-XX Chassis, AR-DR models have four (4) lugs; AR-DE
models have six (6) lugs.
Figure 1: Rigging for Rooftop DOAS Units with DR and DE11-XX,
21-XX, 31-XX Chassis.
Figure 2: Rigging for Rooftop DOAS Units with DR and DE35-XX
Chassis.
For DR and DE35-XX Chassis, AR-DR models have six (6) lugs, AR-DE models have
eight (8) lugs.

17
Installation
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.
Clearances
The minimum allowable clearances around each unit are as follows.
INSTALLATION
Clearances
Figure 3: AR-DR Models (11-XX, 21-XX, 31-XX Chassis) – 36″
Clearance on All Sides.
Failure to abide by these minimum clearances will prevent serviceability or affect unit performance.
Figure 4: AR-DR Models (35-XX Chassis) – 48″ Clearance on All Sides.
Figure 5: AR-DE Models (11-XX, 21-XX, 31-XX Chassis) Clearance. Figure 6: AR-DE Models (35-XX Chassis) Clearance.

18
Rooftop 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.
Installation Location
Receiving and Inspection
Visually inspect the unit before unloading and note any damage in writing on the delivery receipt. If the unit is damaged during shipping, the
customer shall immediately file a claim with the shipping company and notify LG. Photograph the damage if possible. Verify that all pieces
listed on the bill of lading have been received.
Access door handles are locked when shipped from factory. An Allen wrench is required to unlock the door handles.
Storage
Any unit stored outdoors prior to installation should be covered. Do not store other equipment on top of or inside the unit.
Temporary Use
This equipment must not be used as:
• Temporary heating or cooling.
• Construction heating.
The units must not be operated until construction is complete and the units have properly undergone the pre-startup and startup routines.
The bottom of the unit must be eld-insulated if outdoor air can contact the bottom of the unit. To avoid leakage, do not drill or punch holes in the
oor of the unit.
Hanging Installation
DO NOT permanently suspend the unit from the lifting lugs. If the unit is to be hung, additional supports are required under the unit. Hang
the unit from the supports, making sure the unit is level. Failure to keep the unit level will result in operational problems.
Pad Installation
• Check to make sure the pad is level. Failure to provide a level surface will result in operational problems.
• Check for correct orientation of the unit.
• Lift unit per the lifting instructions.
• Secure the unit to the pad in accordance with all applicable building codes.
• Tighten door handles.
Curb Installation
Gasket material must be applied to all surfaces of the curb which contact the unit to create proper seal between the unit and the curb.
• Ensure that the roof curb is level. Failure to level the curb will result in operational problems.
• Lift unit per the lifting instructions.
• Ensure a neoprene gasket is installed on the top flange of the perimeter and cross members of the curb.
• Check for correct orientation of the unit on the curb.
• Check the seal between the roof curb and the unit. Apply additional caulking as required. Failure to provide an adequate seal can result in
air and water leakage into the building.
• Secure the unit to the curb in accordance with all applicable building codes.
• Tighten door handles.
INSTALLATION
Installation Location

19
Installation
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.
Specifications
Factory-supplied roof curbs shall be constructed of 16 gauge G-90 galvanized steel and fully assembled at the factory. A 1.5” wood nailer
shall be provided around the entire perimeter of the curb. Curb shall be fully insulated through 1.5” fiberglass insulation. Cross-member
supports shall be provided for connecting ductwork prior to the unit being set on the roof.
Duct Connections to Curb
When the supply air discharge opening and/or the return air intake opening are located on the bottom of a unit, the ductwork must be
connected to the curb directly. The actual opening sizes in the floor of the unit are not specified as they are slightly undersized from the duct
dimensions shown on the following curb drawings.
Curb and Ductwork Dimensions —AR-DR Models (11-XX, 21-XX, and 31-XX Chassis)
Only AR-DR 11-XX chassis have two cross members (Dimension B; see dimensional drawing below). The supply air ductwork on AR-DR 21-
XX and AR-DR 31-XX chassis is mounted directly to the exterior rail of the curb.
INSTALLATION
Installation Location
Figure 7: Curb and Ductwork Dimensions Diagram for AR-DR Models 11-XX, 21-XX, 31-XX Chassis.
Table 5: Curb and Ductwork Dimensions Table for AR-DR Models 11-XX, 21-XX, 31-XX Chassis.
Chassis A B C D E F G H
AR-DR-11-XX 42.5 in. 7.13 in. 28.25 in. 20.63 in. 22 in. 43.25 in. 17.38 in. 104.75 in.
AR-DR-21-XX 54.75 in. 1.5 in. 51.75 in. 23.75 in. 22 in. 43.13 in. 24.38 in. 114.75 in.
AR-DR-31-XX 61.5 in. 1.5 in. 58.5 in. 20.75 in. 26 in. 50.5 in. 26 in. 124.75 in.

20
Rooftop 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.
Figure 8: Curb and Ductwork Dimensions Diagram for AR-DR Model 35-XX Chassis.
Table 6: Curb and Ductwork Dimensions Table for AR-DR Model 35-XX Chassis.
Chassis A B C D E F
AR-DR-35-XX 86.5 in. 52 in. 43.75 in. 54 in. 24.5 in. 175.75 in.
INSTALLATION
Installation Location