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.

2 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. 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.

3 A copy of this IOM should 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 .. 28 Codes and Ordinances .. 28 Receiving Unit .. 29 Storage .. 30 Packaged Direct Expansion (DX) Units .. 30 Gas or Electric Heating .. 31 Wiring Diagrams .. 32 32 Locating Units .. 32 Setting the Curb .. 34 Forklifting the Unit (6-25 and 30 ton) .. 39 Lifting the Unit .. 39 Duct Connection.

4 42 Seismic Curb Installation .. 43 Outside Air Rain Hood .. 47 End Flashing Installation .. 48 Metal Mesh Filters (6-25 and 30 ton Units) .. 49 Electrical .. 50 Variable Speed Compressors .. 52 Thermostat Control Wiring .. 52 Gas Heating .. 53 Piping Sizing Examples .. 55 Inlet and Manifold Pressures .. 55 Gas Pressure Regulator & Overpressure Protection Device .. 55 Piping Supports .. 56 Additional Gas Piping Considerations .. 56 Leak Testing .. 58 Refrigerant-to-Water heat Exchanger .. 60 Water-Source heat Pump Applications .. 60 Open Loop Applications.

5 60 Freezing Water in the heat Exchanger .. 61 Water Piping .. 62 Condensate Drain Piping .. 64 Draw-Through Coils .. 65 Heating Coils .. 66 Chilled Water Coil .. 66 Electric Preheat .. 67 Status Display Screens .. 67 System Setting Screens .. 68 LED Flash Alarm Codes .. 70 Operation .. 70 Energy Recovery Units .. 71 4 Energy Recovery Wheel Defrost Timer .. 78 Startup .. 79 Supply Fans .. 79 Power Return Axial Flow Fans (16-25 and 30 tons) .. 81 Power Return and Exhaust Axial Flow Fans (26 and 31-140 tons) .. 83 Filters .. 84 Adjusting Refrigerant Charge.

6 84 Checking Liquid Sub-Cooling .. 85 Checking Evaporator Superheat .. 85 Adjusting Sub-cooling and Superheat 86 Suction Filter .. 87 Suction Filter Removal Instructions .. 87 Gas Heater Instructions .. 89 Freeze Stat Startup .. 90 Condenser Fan Electronically Commutated Motor (ECM) Startup .. 90 VFD Controlled Condenser Fan Startup .. 91 Adjustable Fan Cycling Switch Procedure .. 92 94 Thermostat Operation .. 94 Packaged DX Cooling Operation and Control .. 94 Gas Heater Operation .. 94 Electric Heating Operation .. 95 Steam or Hot Water Preheating and Heating Operation.

7 95 Modulating Electric Preheat .. 95 Chilled Water or Non-Compressorized DX Cooling Operation .. 95 Maintenance .. 95 Gas Heating .. 95 Gas heat Exchanger Removal .. 96 DX Cooling .. 97 Condenser Fans (6-25 and 30 ton) .. 97 Condensate Drain Pans .. 98 Evaporator Coil (6-25 and 30 ton) .. 98 Brazed Plate heat Exchanger Cleaning .. 99 E-Coated Coil Cleaning .. 99 Microchannel Coil Cleaning .. 101 Supply Fans .. 103 Power Exhaust Motor and Belt Removal .. 104 Variable Capacity Compressor Controller .. 108 Filter Replacement .. 109 Replacement Parts.

8 119 Appendix A - heat Exchanger Corrosion Resistance .. 120 Appendix B - Thermistor Temperature vs. Resistance Values .. 122 RN Series Startup Form .. 123 Maintenance Log .. 127 Literature Change 128 R90721 Rev. E 190402 5 Index of Tables and Figures Tables: Table 1 - Electric and Gas Heating Capacities .. 32 Table 2 - A Cabinet Unit Clearances .. 33 Table 3 - B Cabinet Unit Clearances .. 33 Table 4 - C Cabinet Unit Clearances .. 33 Table 5 - D Cabinet Unit Clearances .. 34 Table 6 - E Cabinet Unit Clearances .. 34 Table 7 - Nameplate Voltage Markings.

9 50 Table 8 Single Circuited Variable Speed Compressor VFD Frequency Range .. 52 Table 9- Tandem Circuited Variable Speed Compressor VFD Frequency Range .. 52 Table 10 - Control Wiring .. 53 Table 11 - 6-8 and 10 ton Gas Connections .. 53 Table 12 9, 11, 13, & 15 ton Gas Connections .. 53 Table 13 14, 16-25 and 30 ton .. 54 Table 14 - 26 and 31-70 ton .. 54 Table 15 - 55, 65 and 75-140 ton Gas Connections .. 54 Table 16 - Natural Gas (ft3/hr) Maximum Piping Capacities .. 54 Table 17 - Propane (kBtu/hr) Maximum Piping Capacities .. 55 Table 18 - Gas Piping Supports.

10 56 Table 19 - Glycol Freezing Points .. 62 Table 20 - Standard Brazed Plate heat Exchanger Water Connections .. 62 Table 21 - SMO 254 Brazed Plate heat Exchanger Water Connections .. 62 Table 22 - Draw-Through Drain Trap Dimensions .. 65 Table 23 - Steam Coil Connection Sizes .. 66 Table 24 - Hot Water Coil Connection Sizes .. 66 Table 25 - Chilled Water Coil Connection Sizes .. 66 Table 26 - Stages of Electric Preheat .. 69 Table 27 - Plenum Fan Set Screw Specifications .. 81 Table 28 - Pin Location .. 82 Table 29 - Pin Groove 82 Table 30 - Acceptable Fin & Tube Air-Cooled Condenser Coil Refrigeration Circuit Values.