LG AR-DR11-10A, AR-DR21-16A, AR-DR11-05A, AR-DR21-13A, AR-DR21-10A Installation And Operation Manual

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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

PROPRIETARY DATA NOTICE

This document, as well as all reports, illustrations, data, information,

and other materials are the property of LG Electronics U.S.A., Inc., and are

disclosed by LG Electronics U.S.A., Inc. only in confidence.

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.

For more technical materials such as submittals, catalogs, engineering

manuals, and forms, visit www.lghvac.com.

For continual product development, LG Electronics U.S.A., Inc. reserves the right to change specifications without notice.

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

Due to our policy of continuous product innovation, some specifications may change without notification.

WARNING

DANGER

WARNING

CAUTION

SAFETY PRECAUTIONS

The instructions below must be followed to prevent product malfunction, property damage, injury or death to the user or other people. Incorrect operation due to ignoring any instructions will cause harm or damage. The level of seriousness is classified by the symbols below.

TABLE OF SYMBOLS

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.

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.

INSTALLATION

Don’t use or store ammable gas or combustibles near the unit.

There is risk of re, explosion, and physical injury or death.

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.

Rooftop Dedicated Outdoor Air System Installation Manual

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.

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 refrigerant leaks and safety limits are exceeded, it could result in personal injuries or death from oxygen depletion.

Do not touch the unit with wet

Due to our policy of continuous product innovation, some specifications may change without notification.

CAUTION

SAFETY PRECAUTIONS

INSTALLATION – CONTINUED

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, 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 preserving 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 according 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

Due to our policy of continuous product innovation, some specifications may change without notification.

DANGER

WARNING

SAFETY PRECAUTIONS

WIRING

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.

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.

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.

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 physical 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.

Failure to carefully read and follow all instructions in this manual can result in equipment malfunction or property damage.

Rooftop Dedicated Outdoor Air System Installation Manual

Due to our policy of continuous product innovation, some specifications may change without notification.

OPERATION

DANGER

WARNING

CAUTION

SAFETY PRECAUTIONS

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 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.

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 operating 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.

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.

Safety Precautions

To avoid physical injury, use caution when cleaning or servicing the air conditioner.

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 specialpurpose 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.

Due to our policy of continuous product innovation, some specifications may change without notification.

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.

UNIT NOMENCLATURE

Family

AR = Air-Source Packaged Rooftop Unit, R410A Refrigerant

Type

D = Dedicated Outdoor Air System (DOAS)

ERV Option

R = Base Unit

E = Energy Recovery Wheel

Chassis Size

11 = 110

21 = 210

31 = 310

35 = 352

D R 11 05

Cooling Capacity

05 = 5 Tons

08 = 8 Tons

10 = 10 Tons

13 = 13 Tons

16 = 16 Tons

Rooftop Dedicated Outdoor Air System Installation Manual

18 = 18 Tons

20 = 20 Tons

Series

A = First Series

25 = 25 Tons

30 = 30 Tons

40 = 40 Tons

50 = 50 Tons

60 = 60 Tons

70 = 70 Tons

Due to our policy of continuous product innovation, some specifications may change without notification.

Base Rooftop DOAS AR-DR Models

Refrigerant Access

Furnace

Electrical Panel

Supply Air

Supply Fan

Return Air

Outside Air Damper

DX Coil

PRODUCT OVERVIEW

Energy Recovery Wheel Rooftop DOAS AR-DE Models

Refrigerant Access

Product Data

DX Coil

Energy Recovery

Outside Air Damper

Furnace

Electrical Panel

Area

Supply Air

Due to our policy of continuous product innovation, some specifications may change without notification.

Supply Fan

Return Air

Exhaust Fan

PRODUCT OVERVIEW

Field Wiring Terminal Blocks

Electrical Panel View

Transformers

Phase Volt Monitor

Control Relays

Digital Scroll Compressor Control Board

Rooftop Dedicated Outdoor Air System Installation Manual

Compressor Overloads and Contactors

Other components may be present depending on the chosen options.

Due to our policy of continuous product innovation, some specifications may change without notification.

GENERAL DATA

Base Rooftop DOAS

Table 1: Base Rooftop DOAS.

Model No.

Design Airflow (CFM) 1,000 1,400 1,800 2,000 2,400 2,900 3,300 3,700 ESP (in. wg) 1.9 2 2 2 2 2 2 2 Entering Air Summer

DB / WB (°F) Entering Air Winter

DB (°F)

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) Sensible Cooling

Capacity (MBH) Hot Gas Reheat Coil

Capacity (MBH) Evaporator Coil

Depth(Rows) No. of Compressors 1 1 1 2 2 2 2 2

Compressor Type(s) Digital Scroll Digital Scroll Digital scroll

Refrigerant Charge (lbs.)

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 1 1 1 1 1 1 1 1 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

AR-DR11-

05A

95 / 75 95 / 75 95 / 75 95 / 75 95 / 75 95 / 75 95 / 75 95 / 75

0 0 0 0 0 0 0 0

70.3 100.9 129.8 138.1 169.5 203.9 232.9 267.8

43.6 62 79.7 86.4 105.2 126.5 144.2 164.1

21 32 34.9 41.7 50.6 62.2 73.8 82.3

6 6 6 6 6 6 6 6

10.7 15.6 20.2 17.8 23.9 29.9 33.2 36.4

AR-DR11-

08A

AR-DR11-

10A

AR-DR21-

10A

Digital Scroll /

Fixed Speed

AR-DR21-

13A

Digital Scroll /

Fixed Speed

AR-DR21-

16A

Digital Scroll /

Fixed Speed

AR-DR21-

18A

Digital Scroll /

Fixed Speed

AR-DR21-

20A

Digital Scroll /

Fixed Speed

Product Data

• 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.

Due to our policy of continuous product innovation, some specifications may change without notification.

GENERAL DATA

Base Rooftop DOAS

Table 2: Base Rooftop DOAS, continued.

Model No.

Design Airflow (CFM)

ESP (in. wg) 2 2 2 2 2.5 2.5 2 2 2 3 Entering Air

Summer DB/WB (°F) Entering Air

Winter DB (°F)

Cooling Performance

Coil LAT DB / WB (°F)

Unit LAT DB / WB (°F)

Total Cooling Capacity (MBH)

Sensible Cooling Capacity (MBH)

Hot Gas Reheat Coil Capacity (MBH)

Evaporator Coil Depth (Rows)

No. of Compressors 2 4 4 4 4 4 4 4 4 4 Compressor

Type(s) Refrigerant

Charge (lbs.)

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) Capacity Output

(MBH) 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 1 2 2 2 2 2 2 3 2 2 Wheel Dia.(in.) 18 16 18 18 18 15 16 15 18 20

Rooftop Dedicated Outdoor Air System Installation Manual

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 5 2 3 3 5 5 3 3 5 7.5

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

AR-DR21-

25A

4,200 4,500 5,300 5,600 7,000 5,200 6,700 8,500 9,800 12,000

95 / 75 95 / 75 95 / 75 95 / 75 95 / 75 95 / 75 95 / 75 95 / 75 95 / 75 95 / 75

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

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

305.3 318.2 381.3 409.3 503.1 375 482 612.9 705.1 882.5

187.2 196.8 234.1 251.1 310.1 229.9 295.8 375.8 434.6 538.6

86.4 92 107.3 121.2 141.9 136.7 155.1 171.5 182.8 199.9

Digital Scroll/ Fixed Speed

39.7 43.9 50.2 56.5 58.2 75.3 90.5 104.1 111 .5 116.8

400 400 500 500 700 600 600 800 1,000 1,200

320 320 400 400 560 480 480 640 800 960

AR-DR31-

25A

0 0 0 0 0 0 0 0 0 0

6 6 6 6 6 6 6 6 6 6

AR-DR31-

30A

AR-DR31-

35A

AR-DR31-

40A

2 Digital Scroll / 2 Fixed Speed

AR-DR35-

30A

AR-DR35-

40A

AR-DR35-

50A

AR-DR35-

60A

AR-DR35-

70A

• 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.

Due to our policy of continuous product innovation, some specifications may change without notification.

GENERAL DATA

Energy Recovery Wheel Rooftop DOAS

Table 3: Energy Recovery Wheel Rooftop DOAS.

Model No.

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) Entering Air Winter DB (°F) 0 0 0 0 0 0 0 0 0

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) Hot Gas Reheat Coil Capacity

(MBH) Evaporator Coil Depth (Rows) 6 6 6 6 6 6 6 6 6 Number of Compressors 1 1 1 2 2 2 2 2 2 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 1 1 1 1 1 2 1 2 1 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 1 1 1 1 2 2 2 2 2 Exhaust Fan Wheel Diameter

(in.) Exhaust Fan Wheel Speed

(RPM) Exhaust Fan Motor HP 1 3 3 3 1.5 2 3 3 3

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

AR-DE11-

05A

95 / 75 95 / 75 95 / 75 95 / 75 95 / 75 95 / 75 95 / 75 95 / 75 95 / 75

50.8 69.4 89.2 98.3 118.2 140.4 159.9 181.1 204.5

25.8 38.7 41.1 51 61 74.7 88.2 97.5 100.8

14 18 18 18 16 16 18 18 18

1,852 1,695 1,757 1,781 1,796 1,900 1,669 1,726 1,775

AR-DE11-

08A

AR-DE11-

10A

AR-DE21-

10A

AR-DE21-

13A

AR-DE21-

16A

AR-DE21-

18A

AR-DE21-

20A

AR-DE21-

25A

Product Data

• 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.

Due to our policy of continuous product innovation, some specifications may change without notification.

GENERAL DATA

Energy Recovery Wheel Rooftop DOAS

Table 4: Energy Recovery Wheel Rooftop DOAS, continued.

Model No.

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) Entering Air Winter

DB (°F)

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) Sensible Cooling

Capacity (MBH) Hot Gas Reheat

Coil Capacity (MBH) Evaporator Coil

Depth (Rows) No. of Compressors 4 4 4 4 4 4 4 4 4 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. 2 1 1 1 2 2 2 2 2 Supply Fan Wheel

Diameter (in.) Supply Fan Wheel

Speed (RPM) Supply Fan Motor HP 5 15 5 15 5 7.5 7.5 15 15 Exhaust Fan Qty. 2 2 2 2 2 3 2 2 2 Exhaust Fan Wheel

Diameter (in.) Exhaust Fan Wheel

Speed (RPM)

Rooftop Dedicated Outdoor Air System Installation Manual

Exhaust Fan Motor HP 5 5 5 5 3 3 2 10 10

Configuration

Outdoor Air Intake End End End End End End End End End Supply Air

Discharge 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

AR-DE31-

25A

95 / 75 95 / 75 95/75 95/75 95 / 75 95 / 75 95 / 75 95 / 75 95 / 75

0 0 0 0 0 0 0 0 0

312.4 375.2 406.5 489.7 367.2 473.1 596.9 696.2 866.2

220.1 259.2 284.1 328.6 261.4 332.7 409.1 485.6 581.3

108.8 125.1 141.4 162.1 173.7 191.7 205.9 217.1 231.4

6 6 6 6 6 6 6 6 6

18 24 24 24 18 18 20 24 24

2,203 1,669 1,805 1,869 2,094 2,366 2,038 1,937 1,915

18 18 18 18 18 18 20 24 24

1,895 2,009 2,197 2,308 1,812 1,735 1,791 1,545 1,651

Bottom Bottom Bottom Bottom Bottom Bottom Bottom Bottom Bottom

AR-DE31-

30A

AR-DE31-

35A

AR-DE31-

40A

AR-DE35-

30A

AR-DE35-

40A

AR-DE35-

50A

AR-DE35-

60A

AR-DE35-

70A

• 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.

Due to our policy of continuous product innovation, some specifications may change without notification.

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.

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.

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 refrigerant safety.

Verify the maximum refrigerant concentration level for spaces served by DOAS meets the concentration limit for the application.

Product Data

Due to our policy of continuous product innovation, some specifications may change without notification.

INSTALLATION

WARNING

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.

Failure to follow proper instructions could result in property damage.

Figure 1: Rigging for Rooftop DOAS Units with DR and DE11-XX, 21-XX, 31-XX Chassis.

Rooftop Dedicated Outdoor Air System Installation Manual

Figure 2: Rigging for Rooftop DOAS Units with DR and DE35-XX Chassis.

For DR and DE11-XX, 21-XX, 31-XX Chassis, AR-DR models have four (4) lugs; AR-DE models have six (6) lugs.

Due to our policy of continuous product innovation, some specifications may change without notification.

For DR and DE35-XX Chassis, AR-DR models have six (6) lugs, AR-DE models have eight (8) lugs.

Clearances

The minimum allowable clearances around each unit are as follows.

Failure to abide by these minimum clearances will prevent serviceability or affect unit performance.

INSTALLATION

Clearances

Figure 3: AR-DR Models (11-XX, 21-XX, 31-XX Chassis) – 36″ 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.

Figure 4: AR-DR Models (35-XX Chassis) – 48″ Clearance on All Sides.

Installation

Due to our policy of continuous product innovation, some specifications may change without notification.

INSTALLATION

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

Rooftop Dedicated Outdoor Air System Installation Manual

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.

Due to our policy of continuous product innovation, some specifications may change without notification.

INSTALLATION

Installation Location

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 21XX and AR-DR 31-XX chassis is mounted directly to the exterior rail of the curb.

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.

Installation

Due to our policy of continuous product innovation, some specifications may change without notification.

INSTALLATION

Installation Location

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.

Rooftop Dedicated Outdoor Air System Installation Manual

Due to our policy of continuous product innovation, some specifications may change without notification.

INSTALLATION

Installation Location

Curb and Ductwork Dimensions — AR-DE Models (11-XX, 21-XX, and 31-XX Chassis)

AR-DE chassis (11-XX, 21-XX, 31-XX) are constructed with a cross member in the base that requires one of the following when curb mounted:

• Partial-perimeter curb plus secondary support rails (standard factory offering).

• Partial-perimeter curb plus equipment support.

• Single curb with 6″ x 6″ notch(es) to accommodate cross members in one (1) to two (2) locations depending on unit configuration.

Figure 9: Curb and Ductwork Dimensions Diagram for AR-DE Models 11-XX, 21-XX, 31-XX Chassis.

Table 7: Curb and Ductwork Dimensions Table for AR-DE Models 11-XX, 21-XX, 31-XX Chassis.

Chassis A B C D E F G H

AR-DE-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. 12 in. 39 in. 36 in. 152.75 in. 179.75 in. AR-DE-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. 12 in. 39 in. 36 in. 162.75 in. 189.75 in. AR-DE-31-XX 61.5 in. 1.5 in. 58.5 in. 20.75 in. 26 in. 50.5 in. 26 in. 124.75 in. 12 in. 39 in. 36 in. 172.75 in. 199.75 in.

Bottom

Return

Air

Side

Return

Air

Bottom

Return

Air

Side

Return Air

Installation

Due to our policy of continuous product innovation, some specifications may change without notification.

INSTALLATION

Installation Location

Figure 10: Curb and Ductwork Dimensions Diagram for AR-DE Model 35-XX Chassis.

Table 8: Curb and Ductwork Dimensions Table for AR-DE Model 35-XX Chassis.

H I

Chassis A B C D E F G

AR-DE-35-XX 86.5 in. 52 in. 43.75 in. 54 in. 24.5 in. 175.75 in. 12 in. 67 in. 110 in. 254.75 in. 297.75 in.

Bottom

Return Air

Side

Return Air

Bottom

Return Air

Rooftop Dedicated Outdoor Air System Installation Manual

Side

Return Air

Due to our policy of continuous product innovation, some specifications may change without notification.

OUTDOOR AIR HOOD ASSEMBLY

Standard Intake Hood with Bird Screen Assembly

Outdoor Air Hood Assembly

Each unit comes with a factory-supplied outdoor air intake hood that must be assembled prior to startup. The outdoor air intake hood is available in two options:

• Standard hood with bird screen. • Hood with optional 1″ aluminum filters.

The individual parts of the intake hood are located between the outdoor air intake damper and the intake hood top piece (Item No. 6 for ARDR and AR-DE 11-XX, 21-XX, 31-XX chassis; Items Nos. 7 and 8 for AR-DR and AR-DE 35-XX chassis), which is secured flush with the end

of the unit during shipment. The 1″ aluminum filters are located in the intake compartment behind the outdoor air intake damper. The outdoor

air intake end of the unit is opposite access to controls and compressors.

Tools Needed

1. Power tool with 5/16” socket drive

Standard Intake Hood with Bird Screen Assembly

Figure 11: Standard Intake Hood with Bird Screen Assembly Parts Diagram.

2. Phillips power bit No. 2. 3. Sheet metal bending hand tool.

4. Silicone caulk.

Table 9: Standard Intake Hood with Bird Screen Parts Description Table.

Item

No.

2* Screen Side Support 2501 (2) 2506 (2) 2511 (2) 2035 (2) 4615 (2)

3 Hood End 2502 (1) 2507 (1) 2512 (1) 2038 (1) 4619 (1) 4 Screen Center Support 2503 (1) 2508 (1) 2513 (1) 2036 (3) 4894 (3) 5 Screen Support Flashing 2504 (1) 2509 (1) 2514 (1) 2498 (3) 4895 (3) 6 Hood Top-A 2500 (1) 2505 (1) 2510 (1) N/A N/A 7 Hood Top-B N / A N / A N / A 2032 (1) 4612 (1) 8 Hood Top-C N / A N / A N / A 2037 (1) 4616 (1)

9 Right Side Triangle 1317 (1) 4087 (1) 8087 (1) 2033 (1) 4613 (1) 10 Left Side Triangle 1318 (1) 4088 (1) 8088 (1) 2034 (1) 4614 (1) 11 Bottom Flashing 1229 (1) 4297 (1) 8297 (1) 2039 (1) 4617 (1) 15 — Part No. / Qty. 1009801 (1) 1009802 (1) 1009803 (1) 1009804 (2) 1015153 (2)

Description

Framed

Bird Screen

For AR-DR / AR-DE

11-XX Chassis

Dimensions 25.50 x 45.50 in. 28.00 x 57.75 in. 39.38 x 64.63 in. 46.50 x 52.75 in. 46.50 x 57.75 in.

For AR-DR / AR-DE

21-XX Chassis

Part Number (Quantity)

For AR-DR / AR-DE

31-XX Chassis

For AR-DE 35-XX

Chassis

For AR-DR 35-XX

Chassis

Installation

The sheet metal screws are included with the hood parts.

Due to our policy of continuous product innovation, some specifications may change without notification.

OUTDOOR AIR HOOD ASSEMBLY

Standard Intake Hood with Bird Screen Assembly

Standard Intake Hood with Bird Screen Assembly Installation

1. Remove the shipping brackets used to secure the Standard Intake Hood with Bird Screen in transit. The brackets (shown below) are typically fabricated of galvanized steel and may be discarded. Retain the sheet metal screws for use in assembling the standard intake hood with bird screen.

2. Remove the row of screws holding the top of the hood to the unit. Set aside the top of the hood and the screws (these will be used in a later step).

3. Remove and discard the shipping foam or tape. Do not remove the adhesive-backed gray gasket from the unit.

Figure 12: Locating the Shipping Brackets (Step 1).

Figure 13: Remove and Discard the Shipping Foam (Step 3).

Figure 14: Location of Lug Channel Screws to Remove (Step 5).

4. Remove and take inventory of parts shipped in the sill of the opening.

5. Remove the lug channel screw on each side of the unit if not already removed.

6. Install the Left Side Triangle support by aligning the pre-punched holes with the

Rooftop Dedicated Outdoor Air System Installation Manual

dimples inside the outdoor air intake sill. Fasten with 5/16″ hex-head screws. The

flanged side of the triangle should be on the bottom of the hood and facing in to the center of the unit, as shown.

Screw to Remove

Figure 15: Install Left Support Triangle with Flange Facing In (Step 6).

Due to our policy of continuous product innovation, some specifications may change without notification.

WARNING

OUTDOOR AIR HOOD ASSEMBLY

Standard Intake Hood with Bird Screen Assembly

7. Install the Right Side Triangle support the same way, with the flange on the bottom and facing in, as shown.

8. Install the “S” rail Bottom Flashing on the bottom of the intake sill as shown. Align the pre-punched holes with the dimples provided on the top edge of the sill. Fasten with the provided 5/16″ hex-head screws.

9. Place the Hood Top on top of the Triangle Side supports, as shown. Fasten the top

edge of the hood to the unit using the 5/16″ x 1.5″ screws removed previously from

the shipping brackets.

Assistance is required to perform this step for the larger hoods on the 31-XX and 35-XX chassis. There is a risk of the product falling and causing physical injury or death.

Figure 16: Install Right Support Triangle with Flange Facing In (Step 7).

Figure 17: Install Bottom Flashing. (Step 8).

Installation

10. Attach the left and right edges of the top of the hood to the triangular supports using the provided 5/16″ hex-head screws.

11. Align the pre-punched holes in the Hood End piece with the leading edge of the hood top. Secure in place with the provided 5/16″ hex-head screws.

12. Caulk the top and side seams where the hood meets the unit and at the ends of the flanges on both sides, as shown.

13. Install Hood End.

Figure 19: Install the Hood Top and Fasten with Screws (Step 9).

Figure 18: Fasten the Left and Right Triangles to the Top with Screws (Step 10).

Due to our policy of continuous product innovation, some specifications may change without notification.

OUTDOOR AIR HOOD ASSEMBLY

Standard Intake Hood with Bird Screen Assembly

14. Position the Screen Center Support so that the pre-punched holes in the Bottom

Flashing and Hood End are aligned. Fasten with No. 8-18″ x 1/2″ Phillips flat-head

sheet metal screws, as shown. For the 35-XX chassis, repeat this step for each of the two (2) additional Screen Center Supports, spanning the width of the hood.

15. Install Right Side screen support, slide screen in channel between Right Side Triangle and Side Screen Support, then install Left Side Screen Support while inserting the screen in slot between Left Side Triangle and Left side screen support.

16. Fasten the perimeter of the Framed Bird Screen(s) to the hood assembly using 5/16″ sheet metal screws spaced at 12″ centers, as shown.

Figure 20: Install the Hood End by Lining up the Prepunched Holes (Steps 11 and 13).

Figure 21: Caulk Top and Side Seams (Step 12).

17. Position the Screen Support Flashing on top of the screen, aligning it over the

Screen Center Support. Secure in place with 5/16″ sheet metal screws. For 35-XX

chassis, secure each of the two (2) additional screen support flashings over the other two (2) screen supports.

Figure 22: Install Screen Center Support (Step

13).

Figure 23: Install Perimeter Screws at 12″ Centers (Step 15).

Rooftop Dedicated Outdoor Air System Installation Manual

Figure 24: Install Screen Support Flashing (Step

16).

Due to our policy of continuous product innovation, some specifications may change without notification.

OUTDOOR AIR HOOD ASSEMBLY

Intake Hood with Aluminum Filter Assembly

Figure 25: Intake Hood with Aluminum Filter Assembly Parts Diagram.

Intake Hood with Aluminum Filter Assembly

• Model AR-DR 11-XX and 21-XX chassis only have one (1) row of aluminum filters.

• Model AR-DR 35-XX chassis has three (3) rows of aluminum filters.

• Model AR-DR 21-XX and 35-XX chassis have two (2) different filter sizes.

• Model AR-DR 31-XX chassis has a special aluminum filter rail top.

Table 10: Intake Hood with Aluminum Filter Assembly Parts Description Table.

Part Number (Quantity)

Item

No.

1A Aluminum Filter A 20 x 25 x 1 in. (2) 20 x 25 x 1 in. (2) 16 x 20 x 1 in. (8) 20 x 25 x 1 in. (8) 16 x 20 x 1 in. (8)

1B Aluminum Filter B N / A 16 x 25 x 1 in. (1) N / A N / A 20 x 25 x 1 in. (4)

3 Hood End 2502 (1) 2507 (1) 2512 (1) 2038 (1) 4619 (1)

6 Hood Top A 2500 (1) 2505 (1) 2510 (1) N / A N / A

7 Hood Top B N / A N / A N / A 2032 (1) 4612 (1)

8 Hood Top C N / A N / A N / A 2037 (1) 4616 (1)

9 Right Side Triangle 1317 (1) 4087 (1) 8087 (1) 2033 (1) 4613 (1)

10 Left Side Triangle 1318 (1) 4088 (1) 8088 (1) 2034 (1) 4614 (1)

11 Bottom Flashing 1229 (1) 4297 (1) 8297 (1) 2039 (1) 4617 (1)

12 Aluminum Filter Bottom N / A 4431 (1) N / A 2308 (1) 4865 (1)

13A Aluminum Filter Rail 1352 (2) 4429 (2) 8424 (3) 2309 (4) 2309 (4)

13B Aluminum Filter Top Rail N / A N / A 8436 (1) N / A N / A

14 Aluminum Filter Side Spacer 1353 (2) 4430 (2) 8425 (4) 2310 (4) 2310 (2) and 4864 (4)

Description

For AR-DR / AR-

DE 11-XX Chassis

For AR-DR /

AR-DE 21-XX

Chassis

For AR-DR /

AR-DE 31-XX

Chassis

For AR-DE 35-XX

Chassis

For AR-DR 35-XX

Chassis

Installation

Due to our policy of continuous product innovation, some specifications may change without notification.

OUTDOOR AIR HOOD ASSEMBLY

Intake Hood with Aluminum Filter Assembly

Intake Hood with Aluminum Filter Assembly Installation

1. Follow Steps 1 through 12 as detailed in “Standard Intake Hood with Bird Screen Assembly Installation”.

2. On the Aluminum Filter Bottom, Aluminum Filter Rail, and Aluminum Filter Top Rail, bend the end tabs 90° with sheet metal bending tool (The Aluminum Filter Top Rail is only shipped with the 31-XX chassis).

3. Attach the Aluminum Filter Bottom (if applicable) by aligning the bottom tab holes with

the dimples on both Triangles, as shown. Fasten with the provided 5/16″ hex-head

screws.

4. For 11-XX and 21-XX Chassis: Attach the top and bottom Aluminum Filter Rails to the side Hood Triangles by aligning the Aluminum Filter Rail tab holes with the dimples on both Triangles. Fasten with the provided 5/16″ hex-head screws (see figures).

For 31-XX Chassis: Install an Aluminum Filter Top Rail as the top filter rail. Install one (1) Aluminum Filter Rail as the bottom filter rail.

For 31-XX and 35-XX Chassis: Install the additional Aluminum Filter Rails at the midpoint of the Hood Triangles. Align the Aluminum Filter Rail tab holes with dimples on both Triangles. The top middle rail must face up, and the bottom middle rail must face down.

Figure 26: Bending the Tab (Step 2).

Figure 27: Install Aluminum Filter Bottom, if Applicable (Step 3).

Figure 28: Location of Top Filter Rail (Step 4A).

5. Install the Aluminum Filters A and B. Verify airflow arrow is facing into the unit.

6. Fasten the Aluminum Filter Side Spacers to the bottom flange of both Triangles to secure the filters.

Figure 29: Location of Bottom Filter Rail (Step 4B).

Figure 30: Install Filters with Arrow Pointing Into the Unit (Step 5).

Rooftop Dedicated Outdoor Air System Installation Manual

Airflow

Direction

Figure 31: Install Side Spacers (Step 6).

Due to our policy of continuous product innovation, some specifications may change without notification.

DUCT AND CONDENSATE DRAIN CONNECTIONS

Duct and Condensate Drain Connections

Condensate Drain Connection

All condensate drain connections must be properly trapped and primed before operating the unit. Failure to properly trap a drain will result in ooding

the drain pan and potential water damage to the unit or building.

Slope the piping from the trap downward in direction of flow. The trap must be primed before startup by filling the “U” portion of the trap with water. Drains that are not properly trapped and primed will not operate correctly. Each drain connection must be individually trapped.

Drains that are inactive will dry out and air will be drawn through the drain, preventing water flow. Inactive drains should be plugged or connected to a shutoff valve. On outdoor units that operate during freezing weather, install a heat trace around trap piping. Refer to the following figure to determine the correct trap height.

Drain Sizes and Locations

Drains are located on the access side of all units and are sized as shown in the following diagrams.

Figure 33: AR-DR / AR-DE 11-XX, 21-XX, and 31-XX Chassis Drain Sizes and Locations.

Figure 34: AR-DR / AR-DE 35-XX Chassis Drain Size and Location.

Figure 32: Trap Specications.

Installation

Table 11: AR-DR / AR-DE 11-XX, 21-XX, 31-XX, and 35-XX Chassis Drain Sizes and Locations.

Chassis Size A (in.) B (in.) Diameter (in.)

11-XX 58 7 1.0 21-XX 65 7 1.0 31-XX 75 7 1.0 35-XX 119 4 1.0

Duct Connections

The contractor is responsible for providing transitions to accommodate difference in sizing between the unit and the building ducts. Duct connections to collar-type openings can be made with S-cleats or overlapping joints. Apply caulk around each duct connection. Failure to seal duct connections can cause air leakage and system performance problems.

A straight duct for a distance of three (3) to six (6) duct diameters from the unit discharge should be used to develop a full dynamic head. Branching and turning closer to the discharge causes system effect losses.

When an air duct which carries supply air or warm air passes through a combustible roof, a clearance of one inch must be maintained between the outside perimeter of ductwork and any combustible materials, per NFPA Standard 90A.

Due to our policy of continuous product innovation, some specifications may change without notification.

ACCESS HOLES

Access Holes

A number of pre-punched holes / openings are provided on the cabinet for electrical and gas connections for each unit.

Figure 35: AR-DR / AR-DE 11-XX Chassis Access Holes. Figure 36: AR-DR / AR-DE 21-XX Chassis Access Holes.

11-XX Cabinet

Figure 37: AR-DR / AR-DE 31-XX Chassis Access Holes. Figure 38: AR-DR / AR-DE 35-XX Chassis Access Holes.

21-XX Cabinet

Rooftop Dedicated Outdoor Air System Installation Manual

35-XX Cabinet

31-XX Cabinet

Due to our policy of continuous product innovation, some specifications may change without notification.

+ 89 hidden pages