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RN SERIESPackaged Rooftop Units, Heat Pumps,& Outdoor Air Handling UnitsInstallation, Operation,& MaintenanceWARNINGFIRE OR EXPLOSION HAZARDFailure to follow safety warningsexactly could result in seriousinjury, death or property damage.WARNINGo Do not store gasoline or other flammablevapors and liquids in the vicinity of this or anyother applianceImproper installation, adjustment,alteration, service, or maintenancecan cause serious injury, death, orproperty damage.o WHAT TO DO IF YOU SMELL GAS Do not try to light any appliance. Do not touch any electrical switch; do notuse any phone in your building. Leave the building immediately. Immediately call your gas supplier from aphone remote from the building. Follow thegas supplier’s instructions. If you cannot reach your gas supplier, callthe fire department.A copy of this IOM should be keptwith the unit.o Startup and service must be performed by aFactory Trained Service Technician.Be sure to read and understandthe installation, operation, andservice instructions in this manual.
Table of ContentsAAON RN Series Features and Options Introduction . 8Safety . 9RN Series Feature String Nomenclature . 15General Information . 27Codes and Ordinances . 27Receiving Unit . 28Storage . 29Packaged Direct Expansion (DX) Units . 29Gas or Electric Heating . 30Wiring Diagrams. 31Installation. 31Locating Units. 31Setting the Curb . 33Forklifting the Unit (6-25 and 30 ton) . 38Lifting the Unit . 38Duct Connection . 41Seismic Curb Installation . 42Outside Air Rain Hood . 46End Flashing Installation . 47Metal Mesh Filters (6-25 and 30 ton Units) . 48Electrical . 49Variable Speed Compressors . 51Thermostat Control Wiring . 51Gas Heating. 52Piping Sizing Examples . 54Inlet and Manifold Pressures . 54Gas Pressure Regulator & Overpressure Protection Device . 54Piping Supports . 55Additional Gas Piping Considerations . 55Leak Testing. 57Refrigerant-to-Water Heat Exchanger . 59Water-Source Heat Pump Applications . 59Open Loop Applications . 59Freezing Water in the Heat Exchanger . 60Water Piping . 61Condensate Drain Piping . 63Draw-Through Coils . 64Heating Coils . 65Chilled Water Coil . 65Electric Preheat . 66Status Display Screens . 66System Setting Screens . 67LED Flash Alarm Codes . 69Operation. 69Energy Recovery Units . 703
Energy Recovery Wheel Defrost Timer . 77Startup . 78Supply Fans. 78Power Return Axial Flow Fans (16-25 and 30 tons) . 80Power Return and Exhaust Axial Flow Fans (26 and 31-140 tons). 82Filters . 83Adjusting Refrigerant Charge . 83Checking Liquid Sub-Cooling . 84Checking Evaporator Superheat . 84Adjusting Sub-cooling and Superheat Temperatures. 85Suction Filter. 86Suction Filter Removal Instructions . 86Gas Heater Instructions . 88Freeze Stat Startup . 89Condenser Fan Electronically Commutated Motor (ECM) Startup . 89VFD Controlled Condenser Fan Startup . 90Adjustable Fan Cycling Switch Procedure . 91Operation. 93Thermostat Operation . 93Packaged DX Cooling Operation and Control . 93Gas Heater Operation. 93Electric Heating Operation . 94Steam or Hot Water Preheating and Heating Operation . 94Modulating Electric Preheat . 94Chilled Water or Non-Compressorized DX Cooling Operation . 94Maintenance . 94Gas Heating. 94Gas Heat Exchanger Removal . 95DX Cooling . 96Condenser Fans (6-25 and 30 ton) . 96Condensate Drain Pans . 97Evaporator Coil (6-25 and 30 ton) . 97Brazed Plate Heat Exchanger Cleaning . 98E-Coated Coil Cleaning . 98Microchannel Coil Cleaning . 100Supply Fans. 102Power Exhaust Motor and Belt Removal . 103Variable Capacity Compressor Controller . 107Filter Replacement . 108Replacement Parts. 118Appendix A - Heat Exchanger Corrosion Resistance . 119Appendix B - Thermistor Temperature vs. Resistance Values . 121RN Series Startup Form . 122Maintenance Log . 126Literature Change History. 127R90721 · Rev. E · 1902274
Index of Tables and FiguresTables:Table 1 - Electric and Gas Heating Capacities . 31Table 2 - A Cabinet Unit Clearances . 32Table 3 - B Cabinet Unit Clearances . 32Table 4 - C Cabinet Unit Clearances . 32Table 5 - D Cabinet Unit Clearances . 33Table 6 - E Cabinet Unit Clearances. 33Table 7 – Single Circuited Variable Speed Compressor VFD Frequency Range . 51Table 8- Tandem Circuited Variable Speed Compressor VFD Frequency Range . 51Table 9 - Control Wiring. 52Table 10 - 6-8 and 10 ton Gas Connections . 52Table 11 – 9, 11, 13, & 15 ton Gas Connections . 52Table 12 – 14, 16-25 and 30 ton . 53Table 13 - 26 and 31-70 ton . 53Table 14 - 55, 65 and 75-140 ton Gas Connections . 53Table 15 - Natural Gas (ft3/hr) Maximum Piping Capacities . 53Table 16 - Propane (kBtu/hr) Maximum Piping Capacities . 54Table 17 - Gas Piping Supports . 55Table 18 - Glycol Freezing Points . 61Table 19 - Standard Brazed Plate Heat Exchanger Water Connections . 61Table 20 - SMO 254 Brazed Plate Heat Exchanger Water Connections . 61Table 21 - Draw-Through Drain Trap Dimensions . 64Table 22 - Steam Coil Connection Sizes . 65Table 23 - Hot Water Coil Connection Sizes. 65Table 24 - Chilled Water Coil Connection Sizes . 65Table 25 - Stages of Electric Preheat . 68Table 26 - Plenum Fan Set Screw Specifications . 80Table 27 - Pin Location. 81Table 28 - Pin Groove Location. 81Table 29 - Acceptable Fin & Tube Air-Cooled Condenser Coil Refrigeration Circuit Values . 84Table 30 - Acceptable Water-Cooled Refrigeration Circuit Values . 84Table 31 - Acceptable Microchannel Air-Cooled Condenser Coil Liquid Sub-Cooling Values . 85Table 32 - R-410A and R-22 Refrigerant Temperature-Pressure Chart . 87Table 33 - ECM Condenser Fan Cycling Options . 90Table 34 - Demand Signal vs. Compressor Capacity Modulation. 107Table 35 - 6-8 and 10 ton Pre Filters . 108Table 36 - 9 and 11-15 ton Pre Filters . 109Table 37 – 14, 16-25 and 30 ton Pre Filters . 109Table 38 - 26, 31, and 40 ton Pre Filters. 109Table 39 - 50, 60, and 70 ton Pre Filters. 109Table 40 - 55, 65, and 75 ton Pre Filters. 110Table 41 - 90-140 ton Pre Filters . 1105
Table 42 - 26, 31-50, 60, and 70 ton Preheat Filters . 110Table 43 - 6-8 and 10 ton Unit Filters. 111Table 44 - 9 and 11 ton Unit Filters . 111Table 45 - 13 and 15 ton Unit Filters . 112Table 46 – 14, 16-25 and 30 ton Unit Filters . 112Table 47 - 26, 31, and 40 ton Unit Filters . 113Table 48 - RN Series 50, 60, and 70 ton Unit Filters. 113Table 49 - 55, 65, and 75 ton Unit Filters . 114Table 50 - 90-140 ton Unit Filters . 114Table 51 - 6-8 and 10 ton Energy Recovery Wheel Filters . 114Table 52 - 9 and 11-15 ton Energy Recovery Wheel Filters . 115Table 53 – 14, 16-25 and 30 ton Energy Recovery Wheel Filters . 115Table 54 - 26, 31-50, 60, and 70 ton Energy Recovery Wheel Filters . 116Table 55 - 55, 65, and 75-140 ton Energy Recovery Wheel Filters . 117Figures:Figure 1 - Lockable Handle . 28Figure 2 - RN Series A, B and C Cabinet, .
8 AAON RN Series Features and Options Introduction Energy Efficiency Direct Drive Backward Curved Plenum Supply Fans Two-Step, Variable Capacity and Variable Speed R-410A Scroll Compressors Airside Economizers Factory Installed AAONAIRE Energy Recovery Wheels Double Wall Rigid Polyurethane Foam Panel Construction, R-13 Insulation
