RN SERIES
Packaged Rooftop Units, Heat Pumps,
& Outdoor Air Handling Units
Installation, Operation,
& Maintenance
o Do not store gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance
o WHAT TO DO IF YOU SMELL GAS Do not try to light any appliance. Do not touch any electrical switch; do not
use any phone in your building. Leave the building immediately. Immediately call your gas supplier from a
phone remote from the building. Follow the gas suppliers instructions.
If you cannot reach your gas supplier, call the fire department.
o Startup and service must be performed by a Factory Trained Service Technician.
WARNING
FIRE OR EXPLOSION HAZARD
Failure to follow safety warnings exactly could result in serious injury, death or property damage. Be sure to read and understand the installation, operation, and service instructions in this manual. Improper installation, adjustment, alteration, service, or maintenance can cause serious injury, death, or property damage. A copy of this IOM should be kept with the unit.
WARNING
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Table of Contents AAON
RN Series Features and Options Introduction .................................................................. 8
Safety .............................................................................................................................................. 9 RN Series Feature String Nomenclature ....................................................................................... 14 General Information ...................................................................................................................... 26
Codes and Ordinances .............................................................................................................. 26
Receiving Unit .......................................................................................................................... 27 Packaged Direct Expansion (DX) Units ................................................................................... 28 Gas or Electric Heating ............................................................................................................. 29 Wiring Diagrams ....................................................................................................................... 30
Installation..................................................................................................................................... 31
Locating Units ........................................................................................................................... 31 Setting the Curb ........................................................................................................................ 32
Forklifting the Unit (6-25 and 30 ton) ...................................................................................... 38 Lifting the Unit ......................................................................................................................... 38 Duct Connection ....................................................................................................................... 41 Seismic Curb Installation .......................................................................................................... 42
Outside Air Rain Hood ............................................................................................................. 46 End Flashing Installation .......................................................................................................... 47 Metal Mesh Filters (6-25 and 30 ton Units) ............................................................................. 48
Electrical ................................................................................................................................... 49 Variable Speed Compressors ................................................................................................ 51
Thermostat Control Wiring ................................................................................................... 51 Gas Heating ............................................................................................................................... 52
Piping Sizing Examples ........................................................................................................ 54
Inlet and Manifold Pressures ................................................................................................ 54
Gas Pressure Regulator & Overpressure Protection Device ................................................. 54 Piping Supports ..................................................................................................................... 55 Additional Gas Piping Considerations .................................................................................. 55
Leak Testing .......................................................................................................................... 57 Refrigerant-to-Water Heat Exchanger ...................................................................................... 58
Water-Source Heat Pump Applications ................................................................................ 58 Open Loop Applications ....................................................................................................... 58 Freezing Water in the Heat Exchanger ................................................................................. 59 Water Piping ......................................................................................................................... 60
Condensate Drain Piping .......................................................................................................... 62 Draw-Through Coils ................................................................................................................. 63 Heating Coils ............................................................................................................................ 64
Chilled Water Coil .................................................................................................................... 64 Electric Preheat ......................................................................................................................... 65
Status Display Screens .......................................................................................................... 65 System Setting Screens ......................................................................................................... 66
LED Flash Alarm Codes ....................................................................................................... 68 Operation ............................................................................................................................... 68
Energy Recovery Units ............................................................................................................. 69
Energy Recovery Wheel Defrost Timer .................................................................................. 76
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Startup ........................................................................................................................................... 77
Supply Fans ............................................................................................................................... 77 Power Return Axial Flow Fans (16-25 and 30 tons) ................................................................ 79 Power Return and Exhaust Axial Flow Fans (26 and 31-140 tons) .......................................... 81
Filters ........................................................................................................................................ 82 Adjusting Refrigerant Charge ................................................................................................... 82
Checking Liquid Sub-Cooling .............................................................................................. 83 Checking Evaporator Superheat............................................................................................ 83 Adjusting Sub-cooling and Superheat Temperatures............................................................ 84
Gas Heater Instructions ............................................................................................................. 86 Freeze Stat Startup .................................................................................................................... 87 Condenser Fan Electronically Commutated Motor (ECM) Startup ......................................... 87 VFD Controlled Condenser Fan Startup ................................................................................... 88
Adjustable Fan Cycling Switch Procedure ............................................................................... 89 Operation....................................................................................................................................... 91
Thermostat Operation ............................................................................................................... 91 Packaged DX Cooling Operation and Control ......................................................................... 91
Gas Heater Operation ................................................................................................................ 91 Electric Heating Operation .................................................................................................
