Packaged Rooftop Units, Heat Pumps, & Outdoor Air …

1 RN SERIES Packaged Rooftop Units, heat Pumps, & Outdoor Air Handling Units Installation, Operation, & Maintenance oDo not store gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance oWHAT 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 supplier s instructions. If you cannot reach your gas supplier, call the fire department.

2 OStartup 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 must be kept with the unit . WARNING 3 Table of Contents AAON RN Series Features and Options Introduction .. 8 Safety .. 9 RN Series Feature String Nomenclature .. 15 General Information.

3 27 Codes and Ordinances .. 27 Receiving unit .. 28 Storage .. 28 Wiring Diagrams .. 28 29 Locating Units .. 29 Setting the Curb .. 30 Forklifting the unit (6-25 and 30 ton) .. 37 Lifting the unit .. 37 Duct Connection .. 40 Seismic Curb Installation .. 41 Outside Air Rain Hood .. 43 End Flashing Installation .. 44 Metal Mesh Filters (6-25 and 30 ton Units) .. 44 Electrical .. 45 Variable Speed Compressors .. 47 Thermostat Control Wiring .. 48 Condensate Drain Piping .. 48 Draw-Through Coils .. 49 Startup .. 50 Filters .. 50 Supply Fans .. 50 Power Return Axial Flow Fans (16-25 and 30 tons) .. 52 Power Return and Exhaust Axial Flow Fans (26 and 31-140 tons) .. 54 Adjusting Refrigerant Charge.

4 55 Checking Liquid Sub-Cooling .. 56 Checking Evaporator Superheat .. 56 Adjusting Sub-cooling and Superheat 57 Freeze Stat Startup .. 57 Condenser Fan Electronically Commutated Motor (ECM) Startup .. 59 VFD Controlled Condenser Fan Startup .. 59 Adjustable Fan Cycling Switch Procedure .. 60 62 Thermostat Operation .. 62 Packaged DX Cooling Operation and Control .. 62 Gas Heater Operation .. 62 Electric Heating Operation .. 63 Steam or Hot Water Preheating and Heating Operation .. 63 Modulating Electric Preheat .. 63 Chilled Water or Non-Compressorized DX Cooling Operation .. 63 Maintenance .. 63 4 Supply Fans .. 63 Power Exhaust Motor and Belt Removal .. 64 DX Cooling .. 65 Condensate Drain Pans.

5 65 Brazed Plate heat Exchanger Cleaning .. 65 E-Coated Coil Cleaning .. 66 Microchannel Coil Cleaning .. 67 Options .. 69 Heating Coils .. 69 Chilled Water Coil .. 70 Packaged Direct Expansion (DX) Units .. 71 Variable Capacity Compressor Controller .. 72 Evaporator Coil (6-25 and 30 ton) .. 74 Condenser Fans (6-25 and 30 ton) .. 74 Suction Filter (55, 65 and 75-140 ton) .. 75 Suction Filter Removal Instructions .. 76 Refrigerant-to-Water heat Exchanger .. 76 Water-Source heat Pump Applications .. 76 Open Loop Applications .. 76 Freezing Water in the heat Exchanger .. 77 Water Piping .. 78 Energy Recovery Units .. 80 Aluminum Energy Recovery Wheel .. 81 Polymer Energy Recovery Wheel.

6 83 Energy Recovery Wheel General Cleaning .. 90 Energy Recovery Wheel Defrost Timer Setting .. 92 Gas or Electric Heating .. 92 Electric Preheat .. 94 Status Display Screens .. 94 System Setting Screens .. 95 LED Flash Alarm Codes .. 96 Operation .. 97 Gas Heating .. 97 Piping Sizing Examples .. 99 Inlet and Manifold Pressures .. 99 Gas Pressure Regulator & Overpressure Protection Device .. 100 Piping Supports .. 100 Additional Gas Piping Considerations .. 100 Leak Testing .. 104 Gas Heater Operating Instructions .. 105 Gas Heating Maintenance .. 106 Gas heat Exchanger Removal .. 106 Phase and Brownout Protection Module .. 108 Filter Replacement .. 110 Replacement Parts .. 120 Appendix A - heat Exchanger Corrosion Resistance.

7 121 5 Appendix B - Thermistor Temperature vs. Resistance Values .. 123 RN Series Startup Form .. 124 Maintenance Log .. 128 Maintenance Log (E-Coated Coil) .. 129 Literature Change 130 Index of Tables and Figures Tables: Table 1 - A Cabinet unit Clearances .. 29 Table 2 - B Cabinet unit Clearances .. 29 Table 3 - C Cabinet unit Clearances .. 30 Table 4 - D Cabinet unit Clearances .. 30 Table 5 - E Cabinet unit Clearances .. 30 Table 6 - Nameplate Voltage Markings & Tolerances .. 45 Table 7 - RN-A through C Cabinet Variable Speed Compressor Turndown Ratio .. 47 Table 8 - RN-E Cabinet Single Circuited Variable Speed Compressor VFD Frequency Range . 48 Table 9 - RN-E Cabinet Tandem Circuited Variable Speed Compressor VFD Frequency 48 Table 10 - Control Wiring.

8 48 Table 11 - Draw-Through Drain Trap Dimensions .. 50 Table 12 - Plenum Fan Set Screw Specifications .. 52 Table 13 - Pin Location .. 54 Table 14 - Pin Groove 54 Table 15 - Acceptable Fin & Tube Air-Cooled Condenser Coil Refrigeration Circuit Values .. 56 Table 16 - Acceptable Water-Cooled Refrigeration Circuit Values .. 56 Table 17 - Acceptable Microchannel Air-Cooled Condenser Coil Liquid Sub-Cooling Values . 57 Table 18 - R-410A and R-22 Refrigerant Temperature-Pressure Chart .. 58 Table 19 - ECM Condenser Fan Cycling Options .. 59 Table 20 - Steam Coil Connection Sizes .. 70 Table 21 - Hot Water Coil Connection Sizes .. 70 Table 22 - Chilled Water Coil Connection Sizes .. 70 Table 23 - Demand Signal vs.

9 Compressor Capacity Modulation .. 73 Table 24 - Glycol Freezing Points .. 78 Table 25 - Standard Brazed Plate heat Exchanger Water Connections .. 78 Table 26 - Energy Recovery Wheel Cleaning Frequency .. 90 Table 27 - Electric and Gas Heating Capacities .. 93 Table 28 - Stages of Electric Preheat .. 95 Table 29 - 6-8 and 10 ton Gas Connections .. 98 Table 30 - 9, 11, 13, & 15 ton Gas Connections .. 98 Table 31 - 14, 16-25 and 30 ton .. 98 Table 32 - 26 and 31-70 ton .. 98 Table 33 - 55, 65 and 75-140 ton Gas Connections .. 98 Table 34 - Natural Gas (ft3/hr) Maximum Piping Capacities .. 99 Table 35 - Propane (kBtu/hr) Maximum Piping Capacities .. 99 Table 36 - Gas Piping Supports .. 100 Table 37 - 6-8 and 10 ton Pre Filters.

10 110 6 Table 38 - 9 and 11-15 ton Pre Filters .. 111 Table 39 - 14, 16-25 and 30 ton Pre Filters .. 111 Table 40 - 26, 31, and 40 ton Pre Filters .. 111 Table 41 - 50, 60, and 70 ton Pre Filters .. 111 Table 42 - 55, 65, and 75 ton Pre Filters .. 112 Table 43 - 90-140 ton Pre Filters .. 112 Table 44 - 26, 31-50, 60, and 70 ton Preheat Filters .. 112 Table 45 - 6-8 and 10 ton unit 113 Table 46 - 9 and 11 ton unit Filters .. 113 Table 47 - 13 and 15 ton unit Filters .. 114 Table 48 - 14, 16-25 and 30 ton unit Filters .. 114 Table 49 - 26, 31, and 40 ton unit Filters .. 115 Table 50 - RN Series 50, 60, and 70 ton unit Filters .. 115 Table 51 - 55, 65, and 75 ton unit Filters .. 116 Table 52 - 90-140 ton unit Filters.