LG GEN2 Series User manual

ROOFTOP DEDICATED
OUTDOOR AIR SYSTEMS (DOAS)
INSTALLATION AND OPERATION MANUAL
GEN2 Series (AR-DR)
Base Rooftop DOAS
500 to 18,000 CFM
GEN2 Series (AR-DE)
Energy Recovery Wheel Rooftop DOAS
1,000 to 18,000 CFM

Installation, Operation and Maintenance Manual
Please read and save these instructions for future reference. Read carefully before attempting to assemble, install,
operate or maintain the product described. Protect yourself and others by observing all safety information. Failure
to comply with these instructions will result in voiding of the product warranty and may result in personal injury
and/or property damage.
General SafetyInformation
Only qualified personnel should install and maintain this
system. Personnel should have a clear understanding of
these instructions and should be aware of general safety
precautions. Improper installation can result in electric
shock, possible injury due to coming in contact with
moving parts, as well as other potential hazards. Other
considerations may be required if high winds or seismic
activity are present. If more information is needed,
contact a licensed professional engineer before moving
forward.
1. Follow all local electrical and safety codes, as well
as the National Electrical Code (NEC), the National
Fire Protection Agency (NFPA), where applicable.
Follow the Canadian Electrical Code (CEC) in
Canada.
2. All moving parts must be free to rotate without
striking or rubbing any stationary objects.
3. Unit must be securely and adequately grounded.
4. Do not spin wheel faster than maximum cataloged
fan RPM. Adjustments to fan speed significantly
affect motor load. If the fan RPM is changed, the
motor current should be checked to make sure it is
not exceeding the motor nameplate amps.
5. Verify that the power source is compatible with the
equipment.
6. Never open access doors to the unit while it is
running.
WARNING
The roof lining contains high voltage wiring. To
prevent electrocution, do not puncture the interior or
exterior panels of the roof.
DANGER
•Always disconnect power before working on or near
this equipment. Lock and tag the disconnect switch
or breaker to prevent accidental power up.
•If this unit is equipped with optional gas accessories,
turn off gas supply whenever power is disconnected.
CAUTION
This unit is equipped with a compressed refrigerant
system. If a leak in the system should occur,
immediately evacuate the area. An EPA Certified
Technician must be engaged to make repairs or
corrections. Refrigerant leaks may also cause bodily
harm.
CAUTION
When servicing the unit, the internal components may
be hot enough to cause pain or injury. Allow time for
cooling before servicing.

Table ofContents
General Safety Information------------------------------------------------------------------------------------------------2
Unit Nomenclature-----------------------------------------------------------------------------------------------------------8
General Data------------------------------------------------------------------------------------------------------------------9
Receiving, Handling, Storage---------------------------------------------------------------------------------------------16
Product Overview------------------------------------------------------------------------------------------------------------18
- Cooling
- Heating
- Airflow Arrangement
- Safety Listing
- Models and Capacities
Subassemblies---------------------------------------------------------------------------------------------------------------19
Installation
Typical Unit Weights and Dimensions----------------------------------------------------------------------------------21
Service Clearances ---------------------------------------------------------------------------------------------------------22
Additional Clearances for Packaged DX-------------------------------------------------------------------------------23
Handling Concerns for Units with Package DX ----------------------------------------------------------------------23
Lifting----------------------------------------------------------------------------------------------------------------------------23
Roof Curb Mounting---------------------------------------------------------------------------------------------------------24
Optional Piping Vestibule--------------------------------------------------------------------------------------------------24
Ductwork Configurations---------------------------------------------------------------------------------------------------24
Rail Mounting and Layout--------------------------------------------------------------------------------------------------26
Recommended Electrical and Gas Supply Entry Locations ------------------------------------------------------26
- Gas Supply Piping
- Gas Connections
Piping Installation------------------------------------------------------------------------------------------------------------27
- Optional Coil Piping
- Condensate Drain Trap
- Condensate Overflow Switch
Electrical Information-------------------------------------------------------------------------------------------------------28
- Determine the Size of Main Power Lines
- Determine the Size of Electric Heater Wiring
- Provide the Opening(s) for the Electric Connections
- Connect the Power Supplies
- Wire the Optional Convenience Outlet
- Connect Field-Wired Low Voltage Components
- Field-Provided Disconnect
Control Center Operation ------------------------------------------------------------------------------------------------29
- Phase Monitor
- Variable Frequency Drive
- Supply Fan VFD Sequence
Optional Component Operation ----------------------------------------------------------------------------------------31
- Exhaust Fan VFD Sequence
- OA and Recirc Air Damper Sequence
- Exhaust Fan Only Power
- Vapor Tight Lights
- EC Condenser Fans
- Airflow Monitor

- VFD Compressor
- Frost Control
- Rotation Sensor
- Dirty Filter Sensor
- Microprocessor Control
- Unoccupied Recirculation Damper
- Vapor Tight Lights
- Hot Gas Bypass Valve
- Hot Gas Reheat Valve
Factory-Installed Refrigeration System Components----------------------------------------------------------------28
Start-Up –Unit-----------------------------------------------------------------------------------------------------------------29
- Model and Serial Number
- Pre-Start-Up Checklist
- Special Tools Required
- Start-Up Procedure
- Voltage Imbalance
- Start-Up Checklist
Start-Up –Components-----------------------------------------------------------------------------------------------------36
- Fan
- Supply Fan (Plenum Type)
- Fan Wheel Rotation Direction
- Supply/Exhaust Fan
- Vibration
- Discharge Air Temperature Sensor
- Airflow Monitor
- Optional Dirty Filter Switch
Optional Energy Wheel-------------------------------------------------------------------------------------------------------37
- Start-Up
- Drive Belt
- Adjust the Air Seals
- Sequence of Operation
- Maintenance
- Inspection
- Wheel Disassembly
- Cleaning
- Reassembly
- Energy Recovery Wheel Belt
- Energy Recovery Wheel Bearings
- Energy Recovery Wheel –Troubleshooting
Troubleshooting------------------------------------------------------------------------------------------------------------------51
- Alarms
- Microprocessor Controller
- Phase Monitor
- Variable Frequency Drive
- Optional Digital Scroll Compressor Controller
- Unit Refrigeration Circuit

Routine Maintenance-----------------------------------------------------------------------------------------------------------56
- Monthly
- Semiannually
- Annually
- Units with Packaged DX, Semiannually
Maintenance Procedure-------------------------------------------------------------------------------------------------------58
- Lubrication
- Dampers
- Gas Furnace
- Fan Motors
- Fan Wheel and Fasteners
- Internal Filter Maintenance
- External Filter Maintenance
- Coil Maintenance
Reference -------------------------------------------------------------------------------------------------------------------------60
- Venting Connection Locations
- Rated Airflow
Indirect Gas-FiredFurnaces as-FiredFurnaces
General Safety Information ---------------------------------------------------------------------------------------------------62
Receiving, Un-packaging, Storage ------------------------------------------------------------------------------------------63
Unit Identification---------------------------------------------------------------------------------------------------------------- 63
Furnace Model Number--------------------------------------------------------------------------------------------------------63
Burner Control Turndown -----------------------------------------------------------------------------------------------------63
Furnace Serial Number --------------------------------------------------------------------------------------------------------63
ETL Listing-------------------------------------------------------------------------------------------------------------------------63
Product Overview----------------------------------------------------------------------------------------------------------------63
Furnace Control Center--------------------------------------------------------------------------------------------------------64
- Furnace Control Center Components
- Typical Furnace Control Logic
Typical Furnace, Electrical and Control Components ------------------------------------------------------------------65
Gas-Fired Burner Turndown --------------------------------------------------------------------------------------------------66
- Electronic Modulation
- Combinations
- Available Turndown Control Options
Installation of Venting for Outdoor Units---------------------------------------------------------------------------------------67
Installation of Venting for Indoor Units-----------------------------------------------------------------------------------------67
Venting Methods---------------------------------------------------------------------------------------------------------------------68
Installation of Standard Indoor Venting----------------------------------------------------------------------------------------68
- Horizontal
- Vertical
Installation of Concentric Venting------------------------------------------------------------------------------------------------69
- Horizontal
- Vertical
- Two-Pipe Venting –Horizontal
- Two-Pipe Venting –Vertical
Installation of Control Wiring-------------------------------------------------------------------------------------------------------71
Installation of Discharge Air Sensor----------------------------------------------------------------------------------------------71
Installation of Gas Piping -----------------------------------------------------------------------------------------------------------72

- Gas Supply Requirements
- Connect the Supply Gas Line
- Installation of Additional Regulator
- Test the System for Leaks
- Gas Pressure Test Ports
Sequence of Operation----------------------------------------------------------------------------------------------------------76
- Start-Up / Standby
- Heat Mode
- Recovery from Lockout
Performance Data-----------------------------------------------------------------------------------------------------------------76
Start-Up –Furnaces (all units) -------------------------------------------------------------------------------------------------77
- 4:1 Turndown Electronic Modulation
- Adjust High Fire and Low Fire Settings
- Modulating Valve High Fire Setting
- Modulating Valve Low Fire Setting
- With High Turndown Electronic Modulation
Troubleshooting---------------------------------------------------------------------------------------------------------------------81
- Ignition Controller
- 4:1 Modulating with Stand-Alone Controller
- 4:1 Modulating with Microprocessor Controller
Reference: Controls----------------------------------------------------------------------------------------------------------------90
- Furnace Control with Microprocessor
Maintenance--------------------------------------------------------------------------------------------------------------------------91
- Combustion Blower Motor
- Burners and Orifices
- Heat Exchanger
- Flue Collector Box
- Electrical Wiring
- Gas Train
- Replacement Parts
Maintenance Log---------------------------------------------------------------------------------------------------------------------92
Controller
Overview--------------------------------------------------------------------------------------------------------------------------------95
- Keypad Description ----------------------------------------------------------------------------------------------------------------98
- Expansion Boards-------------------------------------------------------------------------------------------------------------------98
- Connecting to the Web UI---------------------------------------------------------------------------------------------------------98
- Service Password-------------------------------------------------------------------------------------------------------------------98
- Startup Settings----------------------------------------------------------------------------------------------------------------------98
- Expansion Board Addresses and Dip Switch Settings --------------------------------------------------------------------98
- IP Address-----------------------------------------------------------------------------------------------------------------------------99
- Main Board Terminal Connections----------------------------------------------------------------------------------------------99
- Expansion Board Terminal Connections---------------------------------------------------------------------------------------98
Software Backup and Restore-------------------------------------------------------------------------------------------------------100
AC Smart Setup-------------------------------------------------------------------------------------------------------------------------102
Navigation ------------------------------------------------------------------------------------------------------------------------------- 106
Unit Status Overview --------------------------------------------------------------------------------------------------------------108
Menu ---------------------------------------------------------------------------------------------------------------------------------------111

Sequence of Operation ---------------------------------------------------------------------------------------------------------------131
Large Controller Overview -----------------------------------------------------------------------------------------------------------136
Medium Controller Overview --------------------------------------------------------------------------------------------------------137
Expansion Board Overview ---------------------------------------------------------------------------------------------------------138
Furnace Overview 139
Controller
Set-Points Data Tables ----------------------------------------------------------------------------------------------------------------140
Network Settings Data Tables -------------------------------------------------------------------------------------------------------147
Alarm Data --------------------------------------------------------------------------------------------------------------------------------151
BACnet and MODBUS Points -------------------------------------------------------------------------------------------------------155
Unit Status Modes ----------------------------------------------------------------------------------------------------------------------167
Lon Talk Points --------------------------------------------------------------------------------------------------------------------------168
Appendix A: Remote Display ---------------------------------------------------------------------------------------------------------171
Appendix B: I/O Expansion Board Quick Start -----------------------------------------------------------------------------------172
Appendix C: Space Thermostat Quick Start --------------------------------------------------------------------------------------173
Appendix D: Greentrol Airflow Monitoring Quick Start --------------------------------------------------------------------------175
Appendix F: Factory Modbus Connections ----------------------------------------------------------------------------------------176

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
02 =12
12 = 112
22 = 212
311 = 311
35 = 352
Cooling Capacity
03 = 3 Tons 15 = 15 Tons
04 = 4 Tons 17 = 17.5 Tons
05 = 5 Tons 20 = 20 Tons
60 = 60 Tons
70 = 70 Tons
06 = 6 Tons 25 = 25 Tons
07 = 7, 7.5 Tons 30 = 30 Tons
10 = 10 Tons 40 = 40 Tons
12 = 12.5 Tons 50 = 50 Tons
Series
A = First Series
AR
D
R
12
05
A
Rooftop Dedicated Outdoor Air System Engineering Manual

GENERAL DATA
Base Rooftop DOAS
Table 1: Base Rooftop DOAS
Model No.
AR-DR02-03A
AR-DR02-04A
AR-DR02-05A
AR-DR02-06A
AR-DR02-07A
Design Airflow (CFM)
620
770
960
1,050
1,240
ESP (in. wg)
2.5
2.5
2.5
2.5
2.5
Entering Air Summer
DB/WB (°F)
95/75
95/75
95/75
95/75
95/75
Entering Air Winter DB (°F)
0
0
0
0
0
Cooling Performance
Coil LAT DB/WB (°F)
54.9/54.8
55.1/55.0
55.0/54.9
54.9/54.8
55/54.9
Total Cooling Capacity
(MBH)
43.6
53.8
67.3
73.8
87.0
Sensible Cooling Capacity
(MBH)
26.8
33.2
41.4
45.4
53.6
Hot Gas Reheat Coil
Capacity (MBH)
35.3
41.7
48.4
52.3
57.9
Evaporator coil depth
(rows)
3
3
4
4
6
Number of compressors
1
1
1
1
1
Compressor Type(s)
Inverter scroll
Inverter scroll
Inverter scroll
Inverter scroll
Inverter scroll
Heating
Fuel
Natural Gas
Natural Gas
Natural Gas
Natural Gas
Natural Gas
Capacity Input (MBH)
75
75
100
100
150
Capacity Output (MBH)
60
60
80
80
120
LAT (°F)
89.6
72.2
77.2
70.5
89.6
Turndown Type
Modulating
Modulating
Modulating
Modulating
Modulating
Turndown Ratio
4:1
4:1
4:1
4:1
4:1
Supply Fan Data
Fan Quantity
1
1
1
1
1
Wheel Speed (RPM)
1900
1939
1991
2029
2113
Motor HP
3/4
3/4
1
1
1.5
Configuration
Outdoor Air Intake
End
End
End
End
End
Supply Air Discharge
Bottom
Bottom
Bottom
Bottom
Bottom
Weight (lbs)
1,064
1,070
1,095
1,098
1,153
Filtration
Hood
None
None
None
None
None
Supply
2" MERV 8
2" MERV 8
2" MERV 8
2" MERV 8
2" MERV 8
Note:
Capacity Data above may 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.

GENERAL DATA
Base Rooftop DOAS
Table 1: Base Rooftop DOAS
Model No.
AR-DR12-05A
AR-DR12-07A
AR-DR12-10A
AR-DR12-12A
AR-DR12-15A
Design Airflow (CFM)
980
1500
1800
2250
2900
ESP (in. wg)
2
2
2
2
2
Entering Air Summer
DB/WB (°F)
95/75
95/75
95/75
95/75
95/75
Entering Air Winter DB (°F)
0
0
0
0
0
Cooling Performance
Coil LAT DB/WB (°F)
54.8/54.7
54.5/54.4
54.5/54
54.9/54.8
54.7/54.5
Unit LAT DB/WB (°F)
93.8
87.2
82.1
81.9
79.9
Total Cooling Capacity
(MBH)
68.2
105.4
128.3
155.6
202.9
Sensible Cooling Capacity
(MBH)
43.3
66.8
80.3
99.2
128.6
Hot Gas Reheat Coil
Capacity (MBH)
41.3
52.8
53.7
65.6
78.8
Evaporator coil depth
(rows)
4
5
4
6
6
Number of compressors
1
1
2
2
2
Compressor Type(s)
Digital scroll
Digital scroll
Digital scroll /
Standard scroll
Digital scroll /
Standard scroll
Digital scroll /
Standard scroll
Heating
Fuel
Natural Gas
Natural Gas
Natural Gas
Natural Gas
Natural Gas
Capacity Input (MBH)
100
200
200
250
300
Capacity Output (MBH)
80
160
160
200
240
LAT (°F)
75.6
98.8
82.3
82.3
76.6
Turndown Type
Modulating
Modulating
Modulating
Modulating
Modulating
Turndown Ratio
4:1
4:1
4:1
4:1
4:1
Supply Fan Data
Fan Quantity
1
1
1
1
1
Wheel Diameter (in)
14
14
14
14
18
Wheel Speed (RPM)
1809
1996
2133
2376
1716
Motor HP
1
1
1.5
1.5
3
Configuration
Outdoor Air Intake
End
End
End
End
End
Supply Air Discharge
Bottom
Bottom
Bottom
Bottom
Bottom
Weight (lbs)
2253
2325
2384
2487
2646
Filtration
Hood
None
None
None
None
None
Supply
2" MERV 8
2" MERV 8
2" MERV 8
2" MERV 8
2" MERV 8
Note:
Capacity Data above may 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.

GENERAL DATA
Base Rooftop DOAS
Table 2: Base Rooftop DOAS, continued.
Model No.
AR-DR22-15A
AR-DR22-17A
AR-DR22-20A
AR-DR22-25A
AR-DR22-30A
Design Airflow (CFM)
2900
3200
3700
4600
5100
ESP (in. wg)
3
3
3
3
3
Entering Air Summer
DB/WB (°F)
95/75
95/75
95/75
95/75
95/75
Entering Air Winter DB (°F)
0
0
0
0
0
Cooling Performance
Coil LAT DB/WB (°F)
54.8/54.6
54.7/54.5
54.3/54.2
54.6/54.4
54.6/54.3
Unit LAT DB/WB (°F)
84.7
83.4
82.3
82.3
81.9
Total Cooling Capacity
(MBH)
202.2
223.8
262.2
323.1
359.6
Sensible Cooling Capacity
(MBH)
128.4
141.8
165.7
204.5
227
Hot Gas Reheat Coil
Capacity (MBH)
93.6
99.1
111.9
137.6
150.8
Evaporator coil depth
(rows)
5
5
6
6
6
Number of compressors
2
2
2
2
2
Compressor Type(s)
Digital scroll /
Standard scroll
Digital scroll /
Standard scroll
Digital scroll /
Standard scroll
Digital scroll /
Standard scroll
Digital scroll /
Standard scroll
Heating
Fuel
Natural Gas
Natural Gas
Natural Gas
Natural Gas
Natural Gas
Capacity Input (MBH)
300
400
400
500
500
Capacity Output (MBH)
240
320
320
400
400
LAT (°F)
76.6
92.6
80.1
80.5
72.6
Turndown Type
Modulating
Modulating
Modulating
Modulating
Modulating
Turndown Ratio
4:1
4:1
4:1
4:1
4:1
Supply Fan Data
Fan Quantity
1
1
1
1
1
Wheel Diameter (in)
20
20
20
20
22
Wheel Speed (RPM)
1591
1622
1702
1671
1777
Motor HP
3
3
3
5
5
Configuration
Outdoor Air Intake
End
End
End
End
End
Supply Air Discharge
Bottom
Bottom
Bottom
Bottom
Bottom
Weight (lbs)
3412
3487
3633
3697
3796
Filtration
Hood
None
None
None
None
None
Supply
2" MERV 8
2" MERV 8
2" MERV 8
2" MERV 8
2" MERV 8
Note:
Capacity Data above may 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.

GENERAL DATA
Base Rooftop DOAS
Table 3: Base Rooftop DOAS, continued.
LG Model
AR-DR31125A
AR-DR31130A
AR-DR31135A
AR-DR31143A
Design Airflow (CFM)
5,000
5,950
7,050
7,950
ESP (in. wg)
3
3
3
3
Entering Air Summer DB/WB (°F)
95/75
95/75
95/75
95/75
Entering Air Winter DB (°F)
0
0
0
0
Cooling Performance
Coil LAT DB/WB (°F)
55/54.7
54.7/54.3
54.9/54.6
54.8/54.5
Unit LAT DB/WB (°F)
83.9
82.8
82.6
82.8
Total Cooling Capacity (MBH)
357.3
430.9
505.3
571.6
Sensible Cooling Capacity (MBH)
220.4
263.9
311.6
351.6
Hot Gas Reheat Coil Capacity
(MBH)
156.1
180.3
211.5
240.5
Evaporator coil depth (rows)
5
5
6
6
Number of compressors
4
4
4
4
Compressor Type(s)
Digital Scroll /
Standard
Scroll
Digital Scroll /
Standard
Scroll
Digital Scroll /
Standard
Scroll
Digital Scroll /
Standard
Scroll
Fuel
Natural Gas
Natural Gas
Natural Gas
Natural Gas
Capacity Input (MBH)
500
500
600
700
Capacity Output (MBH)
400
400
480
560
LAT (°F)
74.1
74.1
63
65.2
Turndown Type
Modulating
Modulating
Modulating
Modulating
Turndown Ratio
4:1
4:1
4:1
5:1
Fan Data
Supply Fan Quantity
2
2
2
2
Supply Fan Wheel Speed (RPM)
1906
3102
3441
2292
Supply Fan Motor HP
3
5
5
5
Configuration
Outdoor Air Intake
End
End
End
End
Supply Air Discharge
Bottom
Bottom
Bottom
Bottom
Return Air Opening
Bottom
Bottom
Bottom
Bottom
Weight (lbs)
6,115
6,041
6,369
6,504
Filtration
Hood
none
none
none
none
Supply
2" MERV8
2" MERV8
2" MERV8
2" MERV8

GENERAL DATA
Base Rooftop DOAS
Table 4: Base Rooftop DOAS, continued.
LG Model
AR-DR35-30A
AR-DR35-40A
AR-DR35-50A
AR-DR35-60A
AR-DR35-70A
Design Airflow (CFM)
5,200
6,700
8,500
9,800
12,000
ESP (in. wg)
3
3
3
3
3
Entering Air Summer DB/WB (°F)
95/75
95/75
95/75
95/75
95/75
Entering Air Winter DB (°F)
0
0
0
0
0
Cooling Performance
Coil LAT DB/WB (°F)
54.7/54.2
54.7/54.3
54.6/54.2
54.6/54.4
54.2/53.9
Unit LAT DB/WB (°F)
80.4
77.3
75.7
73.2
72
Total Cooling Capacity (MBH)
377.7
486.1
617.9
707.3
883.5
Sensible Cooling Capacity (MBH)
230.9
297.4
377.8
435.4
538.9
Hot Gas Reheat Coil Capacity
(MBH)
144.4
163.9
193.9
196.4
231
Evaporator coil depth (rows)
6
6
6
6
6
Number of compressors
4
4
4
4
4
Compressor Type(s)
Digital Scroll /
Standard
Scroll
Digital Scroll /
Standard
Scroll
Digital Scroll /
Standard
Scroll
Digital Scroll /
Standard
Scroll
Digital Scroll /
Standard
Scroll
Heating
Fuel
Natural Gas
Natural Gas
Natural Gas
Natural Gas
Natural Gas
Capacity Input (MBH)
600
600
800
800
1000
Capacity Output (MBH)
480
480
640
640
800
LAT (°F)
85.5
85.5
69.7
69.7
61.7
Turndown Type
Modulating
Modulating
Modulating
Modulating
Modulating
Turndown Ratio
10:1
10:1
10:1
10:1
10:1
Fan Data
Supply Fan Quantity
3
3
3
2
3
Supply Fan Wheel Speed (RPM)
2151
2245
2360
2374
2264
Supply Fan Motor HP
2
3
3
5
5
Configuration
Outdoor Air Intake
End
End
End
End
End
Supply Air Discharge
Bottom
Bottom
Bottom
Bottom
Bottom
Return Air Opening
Bottom
Bottom
Bottom
Bottom
Bottom
Weight (lbs)
7,028
7,379
7,837
7,973
8,304
Filtration
Hood
none
none
none
none
none
Supply
2" MERV8
2" MERV8
2" MERV8
2" MERV8
2" MERV8

GENERAL DATA
Energy Recovery Wheel Rooftop DOAS
Table 5: Energy Recovery Wheel Rooftop DOAS.
LG Model
AR-DE12-05A
AR-DE12-07A
AR-DE12-10A
AR-DE12-12A
AR-DE12-15A
Design Airflow (CFM)
1700
2600
2950
3700
4150
ESP (in. wg)
2
2
2
2
2
Entering Air Summer
DB/WB (°F)
95/75
95/75
95/75
95/75
95/75
Entering Air Winter DB (°F)
0
0
0
0
0
Cooling Performance
Coil EAT DB/WB (°F)
81.4/67.1
81.6/67.3
82.2/67.6
82.3/67.7
83/68.1
Coil LAT DB/WB (°F)
54.8/54.4
54.7/54.3
54.6/53.8
54.7/54.4
53.1/52.7
Unit LAT DB/WB (°F)
79.9
78.3
74.7
74.5
73.3
Total Cooling Capacity
(MBH)
67
104
126.6
153.1
196.5
Sensible Cooling Capacity
(MBH)
49.6
76.7
89.6
112.1
136.3
Hot Gas Reheat Coil
Capacity (MBH)
46.1
66.1
64.1
79.2
90.7
Evaporator coil depth (rows)
4
5
4
6
6
Number of compressors
1
1
2
2
2
Compressor Type(s)
Digital scroll
Digital scroll
Digital scroll /
standard scroll
Digital scroll /
standard scroll
Digital scroll /
standard scroll
Heating
Fuel
Natural Gas
Natural Gas
Natural Gas
Natural Gas
Natural Gas
Capacity Input (MBH)
100
100
150
200
200
Capacity Output (MBH)
80
80
120
160
160
LAT (°F)
92.9
76.9
83.7
85.7
78.9
Turndown Type
Modulating
Modulating
Modulating
Modulating
Modulating
Turndown Ratio
4:1
4:1
4:1
4:1
4:1
Fan Data
Supply Fan Quantity
1
1
1
1
1
Supply Fan Wheel Diameter
(in)
14
18
14
18
18
Supply Fan Wheel Speed
(RPM)
2316
1951
3089
2299
2462
Supply Fan Motor HP
1
3
5
5
7.5
Exhaust Fan Quantity
1
1
1
1
1
Exhaust Fan Wheel
Diameter (in)
14
18
18
18
18
Exhaust Fan Wheel Speed
(RPM)
2302
1725
1725
1750
1750
Exhaust Fan Motor HP
1
3
3
5
7.5
Configuration
Outdoor Air Intake
End
End
End
End
End
Supply Air Discharge
Bottom
Bottom
Bottom
Bottom
Bottom
Return Air Opening
Bottom
Bottom
Bottom
Bottom
Bottom
Weight (lbs)
2997
3213
3239
3414
3557
Filtration
Hood
none
none
none
none
none
Supply
2" MERV8
2" MERV8
2" MERV8
2" MERV8
2" MERV8

GENERAL DATA
Energy Recovery Wheel Rooftop DOAS
Table 6: Energy Recovery Wheel Rooftop DOAS, continued.
Model No.
AR-DE22-15A
AR-DE22-17A
AR-DE22-20A
AR-DE22-25A
AR-DE22-30A
Design Airflow (CFM)
5000
5510
6300
6750
7450
ESP (in. wg)
2
2
2
2
2
Entering Air Summer
DB/WB (°F)
95/75
95/75
95/75
95/75
95/75
Entering Air Winter DB (°F)
0
0
0
0
0
Cooling Performance
Coil EAT DB/WB (°F)
81.1/67
81.5/67.2
82.8/67.6
81.6/67.3
82.2/67.6
Coil LAT DB/WB (°F)
54.5/54.1
54.8/54.3
54.7/54.4
52.5/52.2
52.8/52.4
Unit LAT DB/WB (°F)
77.4
75.5
74.9
74.8
74.9
Total Cooling Capacity
(MBH)
198.6
220.4
259.7
310.2
346.4
Sensible Cooling Capacity
(MBH)
146.1
161.8
190.2
216
240.4
Hot Gas Reheat Coil
Capacity (MBH)
123.8
123
137.5
162.8
178.3
Evaporator coil depth (rows)
5
5
6
6
6
Number of compressors
2
2
2
2
2
Compressor Type(s)
Digital scroll /
standard scroll
Digital scroll /
standard scroll
Digital scroll /
standard scroll
Digital scroll /
standard scroll
Digital scroll /
standard scroll
Heating
Fuel
Natural Gas
Natural Gas
Natural Gas
Natural Gas
Natural Gas
Capacity Input (MBH)
300
300
300
300
300
Capacity Output (MBH)
240
240
240
240
240
LAT (°F)
94.6
88.9
81.3
81.1
76.1
Turndown Type
Modulating
Modulating
Modulating
Modulating
Modulating
Turndown Ratio
4:1
4:1
4:1
4:1
4:1
Fan Data
Supply Fan Quantity
1
1
1
1
1
Supply Fan Wheel Diameter
(in)
20
20
20
20
22
Supply Fan Wheel Speed
(RPM)
1986
2106
2305
2364
2049
Supply Fan Motor HP
7.5
7.5
10
10
10
Exhaust Fan Quantity
1
1
1
1
1
Exhaust Fan Wheel
Diameter (in)
20
20
20
20
22
Exhaust Fan Wheel Speed
(RPM)
1750
1750
1750
1765
1765
Exhaust Fan Motor HP
5
7.5
7.5
10
10
Configuration
Outdoor Air Intake
End
End
End
End
End
Supply Air Discharge
Bottom
Bottom
Bottom
Bottom
Bottom
Return Air Opening
Bottom
Bottom
Bottom
Bottom
Bottom
Weight (lbs)
4624
4731
4901
5028
5084
Filtration
Hood
none
none
none
none
none
Supply
2" MERV8
2" MERV8
2" MERV8
2" MERV8
2" MERV8

GENERAL DATA
Energy Recovery Wheel Rooftop DOAS
Table 7: Energy Recovery Wheel Rooftop DOAS, continued.
LG Model
AR-DE31125A
AR-DE31130A
AR-DE31135A
AR-DE31143A
Design Airflow (CFM)
9,150
10,500
12,200
13,000
ESP (in. wg)
3
3
2
2
Entering Air Summer DB/WB (°F)
95/75
95/75
95/75
95/75
Entering Air Winter DB (°F)
0
0
0
0
Cooling Performance
Coil EAT DB/WB (°F)
80.4/66.4
80.9/66.7
81.6/67.2
81.9/67.4
Coil LAT DB/WB (°F)
54.9/54.2
54.7/54.0
54.9/54.4
54.4/53.8
Unit LAT DB/WB (°F)
75.6
75.3
75.9
76.4
Total Cooling Capacity (MBH)
349.6
423
498.1
559.5
Sensible Cooling Capacity (MBH)
256.1
302
357.3
391.9
Hot Gas Reheat Coil Capacity
(MBH)
205.2
233.9
277.3
308.8
Evaporator coil depth (rows)
5
5
6
6
Number of compressors
4
4
4
4
Compressor Type(s)
Digital Scroll /
Standard
Scroll
Digital Scroll /
Standard
Scroll
Digital Scroll /
Standard
Scroll
Digital Scroll /
Standard
Scroll
Heating
Fuel
Natural Gas
Natural Gas
Natural Gas
Natural Gas
Capacity Input (MBH)
250
300
350
400
Capacity Output (MBH)
200
240
280
320
LAT (°F)
70.8
69.7
67.3
67.7
Turndown Type
Modulating
Modulating
Modulating
Modulating
Turndown Ratio
4:1
4:1
4:1
4:1
Fan Data
Supply Fan Quantity
2
2
2
2
Supply Fan Wheel Speed (RPM)
2372
2522
2598
2628
Supply Fan Motor HP
10
15
15
15
Exhaust Fan Quantity
2
2
2
2
Exhaust Fan Wheel Speed (RPM)
2597
2245
2454
2481
Exhaust Fan Motor HP
7.5
7.5
10
10
Configuration
Outdoor Air Intake
End
End
End
End
Supply Air Discharge
Bottom
Bottom
Bottom
Bottom
Return Air Opening
Bottom
Bottom
Bottom
Bottom
Weight (lbs)
7,250
7,502
7,821
7,838
Filtration
Hood
none
none
none
none
Supply
2" MERV8
2" MERV8
2" MERV8
2" MERV8

GENERAL DATA
Energy Recovery Wheel Rooftop DOAS
Table 8: Energy Recovery Wheel Rooftop DOAS, continued.
LG Model
AR-DE35-30A
AR-DE35-40A
AR-DE35-50A
AR-DE35-60A
AR-DE35-70A
Design Airflow (CFM)
9,400
11,600
13,500
16,000
17,500
ESP (in. wg)
3
3
3
2.5
2.5
Entering Air Summer DB/WB (°F)
95/75
95/75
95/75
95/75
95/75
Entering Air Winter DB (°F)
0
0
0
0
0
Cooling Performance
Coil EAT DB/WB (°F)
80.0/66.1
80.7/66.6
81.4/67.0
82.2/67.6
82.5/67.8
Coil LAT DB/WB (°F)
54.5/53.4
54.3/53.6
53.5/52.9
54.4/53.9
52.3/51.8
Unit LAT DB/WB (°F)
72.5
70.6
70.6
68.1
67.3
Total Cooling Capacity (MBH)
372.9
474.6
597.8
694.5
846.7
Sensible Cooling Capacity (MBH)
262.2
336.7
412.6
489
564.1
Hot Gas Reheat Coil Capacity
(MBH)
182.6
204
249.2
237.1
274.8
Evaporator coil depth (rows)
4
6
6
6
6
Number of compressors
4
4
4
4
4
Compressor Type(s)
Digital Scroll /
Standard
Scroll
Digital Scroll /
Standard
Scroll
Digital Scroll /
Standard
Scroll
Digital Scroll /
Standard
Scroll
Digital Scroll /
Standard
Scroll
Heating
Fuel
Natural Gas
Natural Gas
Natural Gas
Natural Gas
Natural Gas
Capacity Input (MBH)
600
600
600
600
800
Capacity Output (MBH)
480
480
480
480
640
LAT (°F)
99.4
87.5
79.7
68.1
77.4
Turndown Type
Modulating
Modulating
Modulating
Modulating
Modulating
Turndown Ratio
10:1
10:1
10:1
10:1
10:1
Fan Data
Supply Fan Quantity
3
3
3
3
3
Supply Fan Wheel Speed (RPM)
2186
2154
2203
2331
2330
Supply Fan Motor HP
5
7.5
7.5
10
10
Exhaust Fan Quantity
3
2
3
3
3
Exhaust Fan Wheel Speed (RPM)
2372
2014
2276
2019
2076
Exhaust Fan Motor HP
3
5
5
7.5
7.5
Configuration
Outdoor Air Intake
End
End
End
End
End
Supply Air Discharge
Bottom
Bottom
Bottom
Bottom
Bottom
Return Air Opening
Bottom
Bottom
Bottom
Bottom
Bottom
Weight (lbs)
11,438
10,033
13,500
11,006
11,108
Filtration
Hood
none
none
none
none
none
Supply
2" MERV8
2" MERV8
2" MERV8
2" MERV8
2" MERV8

Receiving
This product may have been subject to road salt during
transit. If so, immediately wash off all visible white
residues from all exterior surfaces. Upon receiving the
product, check to ensure all line items are accounted for
by referencing the delivery receipt or packing list.
Inspect each crate or carton for shipping damage before
accepting delivery. Alert the carrier if any damage is
detected, do not refuse shipment. The customer shall
make notation of damage (or shortage of items) on the
delivery receipt and all copies of the bill of lading which
should be countersigned by the delivering carrier. If
damaged, immediately contact your manufacturer’s
representative. Any physical damage to the unit after
acceptance is not the responsibility of the manufacturer.
Handling
Units are to be rigged and moved by the lifting brackets
provided or by the skid when a forklift is used. Location
of brackets varies by model and size. Handle in such
a manner as to keep from scratching or chipping the
coating. Damaged finish may reduce ability of unit to
resist corrosion.
Unpacking
Verify that all required parts and the correct quantity
of each item have been received. If any items are
missing, report shortages to your local representative to
arrange for obtaining missing parts. Sometimes it is not
possible that all items for the unit be shipped together
due to availability of transportation and truck space.
Confirmation of shipment(s) must be limited to only
items on the bill of lading.
Storage
Units are protected against damage during shipment. If
the unit cannot be installed and operated immediately,
precautions need to be taken to prevent deterioration of
the unit during storage. The user assumes responsibility
of the unit and accessories while in storage. The
manufacturer will not be responsible for damage during
storage. These suggestions are provided solely as a
convenience to the user.
The ideal environment for the storage of units and
accessories is indoors, above grade, in a low humidity
atmosphere which is sealed to prevent the entry of
blowing dust, rain, or snow. Units designed for outdoor
applications may be stored outdoors. All accessories
must be stored indoors in a clean, dry atmosphere.
Indoor
Maintain temperatures evenly to prevent condensation.
Remove any accumulations of dirt, water, ice, or snow
and wipe dry before moving to indoor storage. Toavoid
condensation, allow cold parts to reach room
temperature. Leave coverings loose to permit air
circulation and to allow for periodic inspection.
The unit should be stored at least 3½ in. (89 mm) off
the floor. Clearance should be provided to permit air
circulation and space for inspection.
Outdoor
The unit should be placed on a level surface to prevent
water from leaking into the unit. The unit should be
elevated so that it is above water and snow levels.
Ensure sufficient support to prevent unit from settling
into soft ground. Locate parts far enough apart to permit
air circulation, sunlight, and space for periodic
inspection. To minimize water accumulation, place all
unit parts on blocking supports so that rain water will
run off.
Do not cover parts with plastic film or tarps as these
cause condensation of moisture from the air passing
through heating and cooling cycles.
Inspection and Maintenance
While in storage, inspect units once per month. Keep a
record of inspection and maintenance performed.
If moisture or dirt accumulations are found on parts, the
source should be located and eliminated. At each
inspection, rotate the fan wheel by hand ten to fifteen
revolutions to distribute lubricant on motor. If paint
deterioration begins, consideration should be given to
touch-up or repainting. Units with special coatings may
require special techniques for touch-up or repair.
Machined parts coated with rust preventive should be
restored to good condition promptly if signs of rust occur.
Immediately remove the original rust preventive coating
with petroleum solvent and clean with lint-free cloths.
Polish any remaining rust from surface with crocus cloth
or fine emery paper and oil. Do not destroy the continuity
of the surfaces. Wipe thoroughly clean with Tectyl® 506
(Ashland Inc.) or the equivalent. For hard to reach
internal surfaces or for occasional use, consider using
Tectyl® 511M Rust Preventive, WD-40® or the
equivalent.
Removing from Storage
As units are removed from storage to be installed
in their final location, they should be protected and
maintained in a similar fashion until the equipment goes
into operation.
Prior to installing the unit and system components,
inspect the unit assembly to make sure it is in working
order.
1. Check all fasteners, set screws on the fan, wheel,
bearings, drive, motor base, and accessories for
tightness.
2. Rotate the fan wheel(s) by hand and assure no parts
are rubbing.

ProductOverview
A horizontally configured High Percentage Outdoor Air
unit designed for installation either indoors or
outdoors. Each unit has multiple options for cooling
and/or heating. The unit is designed to replace air that
is exhausted from the building and also heat and cool,
as needed. The air volume produced by the unit is
constant, but can be optionally modulated to provide a
variable air volume (VAV) and recirculation is also
offered as an option.
Cooling
Units have the following cooling options available:
•Packaged DX
•Split DX (thermal expansion valve is field-provided)
•Chilled water coil
Units with packaged DX are shipped fully charged with
refrigerant and are ready for operation upon arrival.
Heating
There are three different optional heat sources that can
be ordered for this unit:
•Indirect gas-fired furnace with one or two sets of
heat exchangers
•Electric heat with infinitely variable SCR control
•Hot water coil
Airflow Arrangement
The unit is capable of Constant Air Volume (CAV),
Variable Air Volume (VAV), 100% Outdoor Air and have
recirculating air options.
Safety Listing
Models are listed per ANSI/UL 1995, Heating and
Cooling Equipment and are ETL Certified.
Models and Capacities
Model
Cooling Capacity
AR-DR02
3to 7 tons
AR-DR12
5 to 15 tons
AR-DR22
15 to 30 tons
AR-DR32
25 to 50 tons
AR-DR35
30 to 70 tons
AR-DE12
5 to 15 tons
AR-DE22
15 to 30 tons
AR-DE32
25 to 50 tons
AR-DE35
30 to 70 tons

Subassemblies
Blower - Either one or two plenum-type fans. All units
are equipped with a plenum fan for Supply Air and a
second may be selected for Exhaust (Relief) Air.
Coils - Evaporator coil (optional)
Condenser coil (optional, packaged DX only)
Indoor coil (optional, air-source heat pump only)
Outdoor coil (optional, air-source heat pump only)
Water coil (optional)
Reheat coil (optional)
Compressors - Each unit having packaged DX will
have either one, two or four refrigerant compressors.
Optionally, one of the compressors may be a digital
scroll type compressor. Air-source heat pump units will
have one inverter scroll compressor and may contain a
second staged compressor.
Dampers - Motorized intake air damper, optional
motorized recirculating damper, optional return air
damper. Optional gravity-type exhaust damper.
Optional Barometric Relief Damper - Used during
the unit’s economizer mode for when building pressure
increases, the relief damper will open due to over-
pressurization.
Electric Heater - An SCR controlled electric heater (not
shown) is available on the units. It requires a separate
power supply and has its own control panel. See unit-
specific wiring diagram.
Supply Filters –All housings are available with a filter
bank depth of either 2 or 4-inch.
Indirect Gas-Fired Furnace - Furnace model PVG is
available on AR-DR02, AR-DR12, AR-DE12, AR-
DR22, and AR-DE22. Models AR-DR32 and AR-DE32
use furnace model PVG 600-800 or model HMA 1000-
1200. Models AR-DR35 and AR-DE35 use furnace
model HMA 600-1200.
Packaged DX System - Any unit may be ordered
with a packaged DX system. Housing size 02 will
include one compressor; housing size
12 will include one or two compressors; housing size 22
will include two compressors; housing size 32 will
include three compressors; housing size 35 will include
four compressors; a condenser coil(s) and evaporator
coil(s) and all required components. Units that have
packaged DX are charged with R410A refrigerant. Do
not use tools or parts designed for other refrigerants on
these units.
Air-source Heat Pump –Units having an air-source heat
pump will include either one or two compressors, an
indoor and outdoor coil, and all required components.
Air-source heat pump units are charged with R410A
refrigerant. Do not use tools or parts designed for other
refrigerants on these units. Not currently available on
housing sizes 02, 32, 35.
Split DX –The unit may be ordered with a split DX
system for connection to a building cooling system.
Thermal expansion valve (TXV) is field-provided.
Vestibule - Some units may be ordered with a factory-
assembled vestibule that is to be field-attached to the
side of the unit. See lifting instructions.