AAON RN Series Installation Operation & Maintenance
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AAON RN Series Installation Operation & Maintenance

Packaged rooftop units, heat pumps, & outdoor air handling units
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Packaged Rooftop Units, Heat Pumps,
Installation, Operation,
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.
& Outdoor Air Handling Units
& Maintenance
o Do not store gasoline or other flammable
o WHAT TO DO IF YOU SMELL GAS
o Startup and service must be performed by a
RN SERIES
vapors and liquids in the vicinity of this or any
other appliance
 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.
Factory Trained Service Technician.
(6-140 tons)
WARNING

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  • Page 1 RN SERIES (6-140 tons) Packaged Rooftop Units, Heat Pumps, & Outdoor Air Handling Units Installation, Operation, & Maintenance WARNING WARNING o Do not store gasoline or other flammable FIRE OR EXPLOSION HAZARD vapors and liquids in the vicinity of this or any...

  • Page 3: Table Of Contents

    Table of Contents AAON ® RN Series Features and Options Introduction .............. 8 Safety............................9 RN Series Feature String Nomenclature ..................15 General Information .......................27 Codes and Ordinances......................27 Receiving Unit........................28 Storage ..........................28 Wiring Diagrams ........................28 Installation ..........................29 Locating Units ........................29 Setting the Curb ........................30 Forklifting the Unit (6-25 and 30 ton) ..................37...
  • Page 4 Supply Fans........................63 Power Exhaust Motor and Belt Removal ................64 DX Cooling ........................65 Condensate Drain Pans .......................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...
  • Page 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 History ..................... 130 Index of Tables and Figures Tables: Table 1 - A Cabinet Unit Clearances ..................29 Table 2 - B Cabinet Unit Clearances..................29...
  • Page 6 Figure 9 - Steel Mounting ......................36 Figure 10 - Forklifting an RN Series A, B and C Cabinet, 6-25 and 30 tons ......37 Figure 11 - Lifting Details of a 6-25 and 30 ton Standard or Power Exhaust Unit ......38 Figure 12 - Lifting Details of a 6-25 and 30 ton Energy Recovery Wheel or Power Return Unit 38 Figure 13 - Lifting Details of a 26, 31-50, 60 and 70 ton Unit...........39...
  • Page 7 Figure 58 - Gas Heater Instructions ..................105 Figure 59 - Gas Heat Exchanger.................... 107 Figure 60 - RN Series 6-50, 60, and 70 ton Standard Filter Layouts ........119 Figure 61 - RN Series 55, 65, 70-140 ton Standard Filter Layouts .......... 120...

  • Page 8: Aaon ® Rn Series Features And Options Introduction

    ® AAON RN Series Features and Options Introduction Energy Efficiency Safety Continued  Direct Drive Backward Curved Plenum  Supply/Return Firestats Supply Fans  Two-Step, Variable Capacity and Installation and Maintenance Variable Speed R-410A Scroll  Clogged Filter Switch Compressors Color Coded Wiring Diagram ...

  • Page 9: Safety

    Safety Attention must be paid to the following statements: NOTE - Notes are intended to clarify the unit installation, operation, and maintenance. CAUTION - Caution statements are given to prevent actions that may result in equipment damage, property damage, or personal injury. WARNING - Warning statements are given to prevent actions that could result in equipment damage, property damage, personal injury or death.
  • Page 10 WARNING WARNING FIRE, EXPLOSION OR CARBON During installation, testing, servicing, MONOXIDE POISONING HAZARD and troubleshooting of the equipment it may be necessary to work with live Failure to replace proper controls electrical components. Only could result in fire, explosion, or qualified licensed electrician...
  • Page 11 WARNING WARNING GROUNDING REQUIRED UNIT HANDLING All field installed wiring must be To prevent injury or death lifting completed by qualified personnel. equipment capacity shall exceed unit Field installed wiring must comply with weight by an adequate safety factor. NEC/CEC, local and state electrical Always test-lift unit not more than 24 code requirements.
  • Page 12 WARNING WARNING WATER PRESSURE Some chemical coil cleaning compounds are caustic or toxic. Use Prior to connection of condensing these substances only in accordance water supply, verify water pressure is with manufacturer’s usage less than maximum pressure shown instructions. Failure follow on unit nameplate.
  • Page 13 Failure of the condenser as a result of 2. Use only with type of the gas approved chemical corrosion is excluded from for the furnace. Refer to the furnace rating coverage under AAON Inc. warranties plate. heat exchanger manufacturer’s warranties.
  • Page 14 6. The supply and return air ducts must be 8. Every unit has a unique equipment derived from the same space. It is nameplate with electrical, operational, recommended ducts be provided with and unit clearance specifications. Always access panels to allow inspection for duct refer to the unit nameplate for specific tightness.

  • Page 15: Rn Series Feature String Nomenclature

    RN Series Feature String Nomenclature BASE MODEL Model Option A: COOLING/HEAT SERIES AND GENERATION PUMP A1: REFRIGERANT STYLE 0 = Air Handling Unit UNIT SIZE B = R-410A - High Efficiency 006 = 6 ton Capacity C = R-410A - Standard Efficiency...
  • Page 16 RN Series Feature String Nomenclature A4: COOLING/HEAT PUMP STAGING – Cont. Model Option A: COOLING/HEAT V = 2 Stage Heat Pump + 4 Stage Auxiliary Heat PUMP W = 4 Stage Heat Pump + 4 Stage Auxiliary Heat A3: COIL COATING...
  • Page 17 RN Series Feature String Nomenclature B2: HEATING DESIGNATION Feature 1: RETURN/OUTSIDE AIR 0 = No Heating 1A: RETURN/OUTSIDE AIR SECTION 1 = Heat 1 0 = Manually Adjustable OA Opening + RA Opening 2 = Heat 2 A = Economizer...
  • Page 18 RN Series Feature String Nomenclature 1D: RETURN/EXHAUST AIR BLOWER Feature 1: RETURN/OUTSIDE AIR MOTOR 1B: RETURN/EXHAUST AIR BLOWER 0 = Standard - None CONFIGURATION C = 1 hp - 1760 rpm A = 1 Blower + Standard Efficiency Motor D = 2 hp - 1760 rpm...
  • Page 19 RN Series Feature String Nomenclature Model Options Unit Feature Options – – – – – – – – – – – 0 2 5 BB 0 2 3 8 4 : A 0 0 0 D0 B 0D 0 0 0 0 L...
  • Page 20 RN Series Feature String Nomenclature 5B: SUPPLY AIR BLOWER Feature 5: SUPPLY AIR OPTIONS B = 15” Backward Curved Plenum 5A: SUPPLY AIR BLOWER CONFIGURATION C = 18.5” Backward Curved Plenum 0 = 1 Blower + Standard Efficiency Motor D = 24” Backward Curved Plenum A = 2 Blowers + Standard Efficiency Motor E = 27”...
  • Page 21 RN Series Feature String Nomenclature 5C: SUPPLY AIR BLOWER MOTOR 6C: FILTER OPTIONS C = 1 hp - 1760 rpm 0 = Standard D = 2 hp - 1760 rpm A = Clogged Filter Switch E = 3 hp - 1760 rpm...
  • Page 22 RN Series Feature String Nomenclature Feature 8: REFRIGERATION OPTIONS Feature 9: REFRIGERATION 0 = Standard ACCESSORIES A = Hot Gas Bypass Lead Stage or Hot Gas Bypass 0 = Standard Lag Stage with Lead Variable Capacity A = Sight Glass...
  • Page 23 RN Series Feature String Nomenclature Feature 10: POWER OPTIONS Feature 11: SAFETY OPTIONS 0 = Standard Power Block 0 = Standard A = 100 Amp Power Switch A = Return and Supply Air Firestat B = 150 Amp Power Switch...
  • Page 24 RN Series Feature String Nomenclature Feature 12: CONTROLS Feature 13: SPECIAL CONTROLS 0 = Standard 0 = Terminal Block for Thermostat Control A = Low Limit Controls D = VAV Unit Controller - VAV Cool + CV Heat B = Phase and Brown Out Protection...
  • Page 25 RN Series Feature String Nomenclature Feature 14: PREHEAT Feature 15: GLYCOL PERCENTAGE 14A: OUTSIDE AIR CONFIGURATION 0 = Standard - Water or No WSHP with Polymer 0 = Standard - None Energy Recovery Wheel A = Steam Distributing Preheat Coil - 1 Row...
  • Page 26 Feature 23: TYPE B = Standard - AAON Gray Paint U = Special Pricing Authorization + Special Paint X = Special Pricing Authorization + AAON Gray Paint 1 = Standard Paint + 2 Year Parts Only Warranty (Begins at Date of Shipment)

  • Page 27: General Information

    These units must not be used for heating or cooling at any time during Codes and Ordinances any phase of construction. Very low RN Series units have been tested and return temperatures, harmful certified, by ETL, in accordance with UL vapors, and misplacement of the Safety Standard 1995/CSA C22.2 No.

  • Page 28: Receiving Unit

    B52. All appliances must be electrically grounded in accordance with local codes, or warranty. Contact the AAON Warranty in the absence of local codes, the current Department for assistance with handling National Electric Code, ANSI/NFPA 70 or...

  • Page 29: Installation

    Flue gas is dangerously hot and contains Installation containments. The user is responsible for AAON equipment has been designed for determining if vent gases may degrade quick and easy installation. building materials. Locating Units The National Gas and Propane Installation The curb must be mounted first and must be Code, B149.1 specifies a 6 ft.

  • Page 30: Setting The Curb

    72” Left Side 72” Right Side Unobstructed Right Side Front Figure 2 - RN Series A, B and C Cabinet, 6-25 and 30 tons Controls Table 4 - D Cabinet Unit Clearances Left Side Unit Size Location 26 and 31-70 tons...
  • Page 31 Be careful to install the provided neoprene CAUTION isolator according to the following figure prior to setting the unit on the curb. All roofing work must be performed by competent roofing contractors avoid any possible leakage. CAUTION Neoprene isolator for unit vibration isolation is provided in the cabinet and CAUTION must be installed according to installation...

  • Page 32: Figure 5 - Rn Series 6-8 And 10 Ton Unit Isolator Locations

    Figure 5 - RN Series 6-8 and 10 ton Unit Isolator Locations...

  • Page 33: Figure 6 - Rn Series 9 And 11-15 Ton Unit Isolator Locations

    Figure 6 - RN Series 9 and 11-15 ton Unit Isolator Locations...

  • Page 34: Figure 7 - Rn Series 16-25 And 30 Ton Unit Isolator Locations

    Figure 7 - RN Series 16-25 and 30 ton Unit Isolator Locations...

  • Page 35: Figure 8 - Rn Series 26, 31-50, 60, And 70 Ton Unit Isolator Locations

    Figure 8 - RN Series 26, 31-50, 60, and 70 ton Unit Isolator Locations...

  • Page 36: Figure 9 - Steel Mounting

    Figure 9 - Steel Mounting...

  • Page 37: Forklifting The Unit (6-25 And 30 Ton)

    Forks or Fork Extensions must be at least 48” in length. Forks Figure 10 - Forklifting an RN Series A, B and C Cabinet, 6-25 and 30 tons Lifting the Unit If cables or chains are used to hoist the unit It is recommended to lift the unit with the they must be the same length.

  • Page 38: Figure 11 - Lifting Details Of A 6-25 And 30 Ton Standard Or Power Exhaust Unit

    hooks and cables at all lifting points / lugs Carefully lower and align the unit with utility provided on the unit. and duct openings. Lower the unit until the unit skirt fits around the curb. Some units are Hoist unit to a point directly above the curb designed to overhang the curb.

  • Page 39: Figure 13 - Lifting Details Of A 26, 31-50, 60 And 70 Ton Unit

    Figure 13 - Lifting Details of a 26, 31-50, 60 and 70 ton Unit Figure 14 - Lifting Details of a 55, 65 and 75-140 ton Unit...

  • Page 40: Duct Connection

    Duct Connection CAUTION Note: If outside air will be in contact with the air tunnel base of an A, B or C cabinet unit Do not drill or punch holes in the base (6-25 and 30 tons), the unit must include the of the unit, from inside the unit or from base insulation option or the base must be below the unit to attach ductwork.

  • Page 41: Seismic Curb Installation

    All mounting details listed must be followed to Structural engineer of record must approve achieve seismic certification. The AAON field provided building anchorage to unit or unit must be certified to ICC-ES AC156 curb in compliance with OSP-0180-10. Use...

  • Page 42: Figure 17 - Seismic Solid Bottom Curb Without Filters Cross Section

    Figure 17 - Seismic Solid Bottom Curb without Filters Cross Section Figure 18 - Seismic Solid Bottom Curb without Filters Detail A Figure 19 - Seismic Solid Bottom Curb without Filters Detail B Figure 20 - Seismic Rigid Mount Curb...

  • Page 43: Outside Air Rain Hood

    Outside Air Rain Hood Rain hood must be opened before startup of the unit. Fresh air intake adjustments must be made according to building ventilation of local code requirements. 6-25 and 30 ton Units Remove the two screws at the bottom of the rain hood that secure it in the shipping position.

  • Page 44: End Flashing Installation

    End Flashing Installation On RN Series E cabinet units that are 142” wide (RN-55, 65, 75, 90, 105, 120, 130, 140) the cabinet width will overhang the shipping trailer on each side. In order to secure and protect the unit during transit the sheet metal end flashings have been removed from the unit.

  • Page 45: Electrical

    Electrical Verify the unit nameplate agrees with power supply. Connect power and control wiring to the unit as shown in Figure 27 and Figure 28, and in the unit specific wiring diagram, which shows factory and field wiring and is attached to the inside of the door of the controls compartment. Table 6 - Nameplate Voltage Markings &...

  • Page 46: Figure 26 - Unit Utility Entry

    Figure 26 - Unit Utility Entry Utility Entry Figure 28 - Back View of Utility Entry and Power Switch from Control Compartment (55, 65 and 75-140 ton Units) Note: All units are factory wired for 208V, 230V, 380V, 460V, 575V. transformer configuration must be checked by a qualified technician prior to service, especially if unit is to be connected to a 208V...

  • Page 47: Variable Speed Compressors

    CAUTION CAUTION Scroll compressors are directional Three phase voltage imbalance will and will be damaged by operation in cause motor overheating the wrong direction. Low pressure premature failure. switches on compressors have been disconnected after factory testing. Three phase voltage imbalance will cause Rotation must be checked by a motor overheating and premature failure.

  • Page 48: Thermostat Control Wiring

    Table 8 - RN-E Cabinet Single Circuited wiring use the following chart to determine Variable Speed Compressor VFD Frequency the allowable wiring distances. Range Compressor VFD Table 10 - Control Wiring Model (RN-) Range (Hz) Wire Size Total Wire Distance (Stranded) - Copper Allowable 208V and 230V Units...

  • Page 49: Draw-Through Coils

    and one on the right side of the unit. P-traps Draw-Through Coils must be field provided and installed. All drain connections must be used and individually trapped to ensure a minimum amount of condensate accumulation in the drain pans. Use ABS type cement to join the drain pipe connections.

  • Page 50: Startup

    All condensate drain connections clogged evaporator coil. must be used. Drain pans are sloped towards connections. Supply Fans RN Series units are equipped with direct drive backward curved plenum assemblies that are selected to deliver the air volume specified according to unit size and job requirements.
  • Page 51 If the band is field installed, a hand held pop- rivet tool is recommended for connecting the Use fan program in AAON ECat to determine band ends together. Caution must be taken to the new band size for the required cfm and assure that the band is tightly installed and no static pressure.

  • Page 52: Power Return Axial Flow Fans (16-25 And 30 Tons)

    The blower can be moved on the motor shaft to set the correct Step 1: Determine the new required pitch for overlap. These tolerances are critical to the the fan blades performance of the blower. Use the fan program in AAON ECat.

  • Page 53: Figure 32 - Fan With The Hub On The Top And Ret On The Bottom

    Step 2: Maintain the balance of fan Mark the HUB/RET castings across a single joint, so the fan can be reassembled in the same orientation. Bushing Bushing Mark the location of any balancing weight. Balancing weight will be on the outer bolt circle, in the form of washers, and/or longer bolts, or an additional balancing nut.

  • Page 54: Power Return And Exhaust Axial Flow Fans (26 And 31-140 Tons)

    Step 1: Determine the new required pitch for the fan blades Step 3: Remove the mounting nuts and bolts Use the fan program in AAON ECat. Contact and separate hub plate castings the AAON parts department to acquire the new pitch pins for the fan blades.

  • Page 55: Adjusting Refrigerant Charge

    Step 4: Remove the fan blades and replace previous orientation of hub plate casings and the pitch pins to replace any balancing weights in their previous locations. Tighten bolts in a cross pattern to 6.7 ft-lbs. of torque. Step 6: Install the fan in the unit. Pin Groove After placing the fan on the shaft, place the key in the shaft, make sure the screw on the...

  • Page 56: Checking Liquid Sub-Cooling

    unit in reheat (dehumidification) mode to Read gauge pressure at the suction line close check for correct operation. to the compressor. Units equipped with heat pump options must Convert the pressure obtained to a saturated be charged in heating mode to get the proper temperature using the appropriate refrigerant charge.

  • Page 57: Adjusting Sub-Cooling And Superheat Temperatures

    Table 17 - Acceptable Microchannel Air-Cooled Condenser Coil Liquid Sub- Cooling Values Cooling Mode Liquid Sub-Cooling Values(°F) Evaporator Coil Saturation Temperature (°F) Ambient (°F) 9 - 14 8 - 13 8 - 13 7 - 12 5 - 10 10 - 15 9 - 14 9 - 14 8 - 13...

  • Page 58: Table 18 - R-410A And R-22 Refrigerant Temperature-Pressure Chart

    Table 18 - R-410A and R-22 Refrigerant Temperature-Pressure Chart PSIG PSIG PSIG PSIG PSIG (F) R-410A R-22 (F) R-410A R-22 (F) R-410A R-22 (F) R-410A R-22 (F) R-410A R-22 78.3 43.1 142.2 84.1 234.9 143.6 110 364.1 226.4 140 540.1 337.4 80.0 44.2...

  • Page 59: Condenser Fan Electronically Commutated Motor (Ecm) Startup

    Commutated Motor (ECM) Startup The fan cycling option uses a fan cycle switch AAON Condenser Head Pressure Module. to switch between one of the discrete speed See AAON literature for further information. inputs (see (https://www.aaon.com/Controls) Table 19) on the motor thus cycling between...

  • Page 60: Adjustable Fan Cycling Switch Procedure

    Adjustable Fan Cycling Switch Procedure Recommended Settings The switch will come factory set to cut-in at 425psi (+/– 5psi) and a differential of 155psi (or open at 270psi (+/– 5psi)). To adjust the fan cycle switch you will need a flathead screwdriver.
  • Page 61 Cut In Gauge Cut In Gauge To lower the pressure set point for the CUT To raise the pressure set point for the CUT IN IN gauge, turn the adjustable screw gauge, turn the adjustable screw counter clockwise. clockwise. Differential Differential Gauge Gauge...

  • Page 62: Operation

    Operation WARNING Unit operations must be controlled with COMPRESSOR CYCLING thermostat, or unit controller, never at the main power supply, except for servicing, 3 MINUTE MINIMUM OFF TIME emergency, or complete shutdown of the prevent motor overheating unit. compressors must cycle off for a minimum of 3 minutes.

  • Page 63: Electric Heating Operation

    Electric Heating Operation Maintenance When a call for heating (G and W1, W2, etc.) (See back of the manual for maintenance log) is made the supply blower motors and electric resistance heaters will energize. Heating is At least once each year, a trained, qualified accomplished by passing electrical current service technician must check out the unit.

  • Page 64: Power Exhaust Motor And Belt Removal

    Recommended greases are: Slide the motor mount back away from the air SHELL OIL - DOLIUM R inlet, so that the blower wheel is clear of the CHEVRON OIL - SRI No. 2 inlet. A screw driver or crowbar can be used TEXACO INC.

  • Page 65: Dx Cooling

    3. At this point the motor mount can be slid toward the wheel, and the belt can be removed. 4. Once the belt is removed the motor and mount can be lifted out. Make sure the wires to the motor are loose. DX Cooling Set unit controls to cooling mode of operation with supply fans on.

  • Page 66: E-Coated Coil Cleaning

    AAON be used at a very low pressure to E-Coated Coil Maintenance Record sheet. prevent fin and/or coil damages. The force of the water or air jet may bend...

  • Page 67: Microchannel Coil Cleaning

    Enviro-Coil Cleaner: AAON PN: V82540 GulfClean ™ Coil Cleaner; AAON PN: Continue until all coil areas on the inside of the unit have been rinsed. Note: Coils must G074480 always be cleaned / back flushed, opposite...
  • Page 68 AAON will warrant as correct the coil face. for cleaning microchannel coils. 1. Rinse the coil completely with water.

  • Page 69: Options

    AAON testing has determined that unless a Options chemical has a neutral pH (6-8) it must not be (See back of the manual for maintenance log) used. Heating Coils Beware of any product that claims to be a One or two row hot water and steam heating foaming cleaner.

  • Page 70: Chilled Water Coil

    Table 20 - Steam Coil Connection Sizes Steam Coil Coil Steam Model (RN-) Connection Connection Preheat Size Quantity* 2” MPT 2” MPT 006, 007, 008, 010 2” MPT 2” MPT 009, 011, 013, 015 2” MPT 2” MPT 014, 016, 018, 020, 025, 030 2”...

  • Page 71: Packaged Direct Expansion (Dx) Units

    cool down and liquid refrigerant may Packaged Direct Expansion (DX) Units accumulate compressor. WARNING compressor is designed to pump refrigerant gas and damage may occur when power is COMPRESSOR CYCLING restored. 3 MINUTE MINIMUM OFF TIME If power to the unit must be off for more than prevent motor overheating...

  • Page 72: Variable Capacity Compressor Controller

    CAUTION Polyolester (POE) and Polyvinylether (PVE) oils are two types of lubricants used in hydrofluorocarbon (HFC) refrigeration systems. Refer to the compressor label for the proper compressor lubricant type. Note: Multiple Units with Multiple Thermostats Figure 43 - Variable Capacity Compressor Controller When several heating and cooling units are used to condition a space all unit thermostat...

  • Page 73: Table 23 - Demand Signal Vs. Compressor Capacity Modulation

    demand signal and compressor capacity modulation. compressor controller protects compressor against high discharge temperature. Refer to Appendix B for the relationship between thermistor temperature readings and resistance values. Table 23 - Demand Signal vs. Compressor Capacity Modulation Demand Time % Compressor Loaded % Unloaded % Time Loaded...

  • Page 74: Evaporator Coil (6-25 And 30 Ton)

    Reinstallation Evaporator Coil (6-25 and 30 ton) Install the coil in the unit drain pan. There WARNING should be about a 1/4” gap between the upstream side of the coil and the back of the Electric shock hazard. Shut off all drain pan.

  • Page 75: Suction Filter (55, 65 And 75-140 Ton)

    BD filter element for the lowest possible pressure drop. Removing the suction line filter will improve the efficiency and capacity Figure 46 - Removal of a Condenser Fan of the unit. AAON installs isolation ball Assembly valves on both sides of the suction line filter...

  • Page 76: Suction Filter Removal Instructions

    WARNING OPEN LOOP APPLICATIONS Failure of the condenser as a result of chemical corrosion is excluded from 6. Replace the suction filter end plate coverage under AAON Inc. warranties and bolts heat exchanger 7. Evacuate the suction filter assembly manufacturer’s warranties.

  • Page 77: Freezing Water In The Heat Exchanger

    Failure of the condenser as a result of chemical corrosion excluded from Freezing Water in the Heat Exchanger coverage under AAON warranties and the This product contains more heat exchanger manufacturer warranties. refrigerant-to-water heat exchangers. A...

  • Page 78: Water Piping

    WARNING to the equipment as a result of water freezing in the condenser is excluded from coverage WATER PRESSURE under AAON warranties and the heat exchanger manufacturer warranties. Prior to connection of condensing water supply, verify water pressure is Unit is capable of operating with Entering less than maximum pressure shown Water Temperatures (EWT) as low as 57°F,...
  • Page 79 Before connection to the unit the condenser CAUTION water system must be flushed to remove foreign material that could cause condenser PVC (Polyvinyl Chloride) and CPVC fouling. A screen strainer with a minimum of (Chlorinated Polyvinyl Chloride) are 20 Mesh is provided ahead of the condenser vulnerable attack certain...

  • Page 80: Energy Recovery Units

    Energy Recovery Units actual operating conditions, and to configure Some RN units have been equipped with an delivery system optimal energy recovery wheel. AAON provides performance. options for either an aluminum energy recovery wheel or a polymer energy recovery Controls wheel.

  • Page 81: Aluminum Energy Recovery Wheel

    Aluminum Energy Recovery Wheel This section is provided to assure the energy recovery feature will be properly setup to perform accordance with specifications for your particular application. Figure 48 - Aluminum Energy Recovery Wheel 1. Monolith energy recovery wheel 2. Purge Sector 3.
  • Page 82 seal may cause efficiency deterioration, Aluminum Wheel Brush Plate mixing of an air flows and unwanted leakages Brushes are located on both upper sides of the in the system, especially in environments profiles. Inspect their condition and whether with hygienic requirements. they adhere to the surface of the wheel matrix.

  • Page 83: Polymer Energy Recovery Wheel

    not show signs of mechanical damage. Check the convergence on the wheel pulley. The belt must pass freely without encountering any obstacles inside the housing. Due to the segmented design of the belt, replacing individual segments is enough to restore functionality.
  • Page 84 warm, moist air stream to the cooler and/or 2. Adjust purge sector to the specified drier air stream. angle. The initial setup and servicing of the energy recovery wheel is very important to maintain proper operation efficiency and building occupant comfort. Normal maintenance requires...
  • Page 85 to provide slip fit clearance when the wheel Polymer Wheel Air Seal Adjustments Pile type air seals across both sides of the is rotated by hand. energy wheel diameter are factory adjusted to provide close clearance between the air seal Confirm that the wheel rotates freely.
  • Page 86 wheel rotation. Wheel rotates clockwise Bearing beams shown Frame racked (as viewed from the pulley side). If wheel has difficulty starting, turn power off and inspect for excessive interference between the wheel surface Wheel and each of the four (4) diameter seals. correct, loosen diameter seal...
  • Page 87 Adjust seals towards wheel surface until a Polymer Wheel Routine Maintenance and slight friction on the feeler gauge (paper) is Handling Handle cassettes with care. Lift all cassettes detected when gauge is moved along the by the bearing support beam. Holes are length of the spoke.

  • Page 88: Figure 51 - Wheel Segment Removal Pattern

    removing opposing segments for even weight To install wheel segments follow the steps distribution. Failure to maintain control of below. Reverse procedure for segment the wheel rotation while removing removal. installing all segments could cause severe injury to fingers or hands. Always close and Disconnect power from the wheel.
  • Page 89 the third segment is installed. Rotate the Note: Slight hand pressure against wheel rim wheel 180º again to install the fourth will lift weight of wheel from inner race of segment opposite the third. Repeat this bearing to assist bearing removal and sequence with the remaining four...

  • Page 90: Energy Recovery Wheel General Cleaning

    Cleaning the energy transfer media will help maintain optimal performance. frequency of cleaning is largely dependent on application quality. ASHRAE’s Classes of Air categories, to create a routine cleaning schedule. Class contaminant concentration with inoffensive odor and sensory irritation intensity. Class 2 air has moderate contaminant concentration, with mildly offensive odors or sensory-irritation intensity.
  • Page 91 ventilation of machine shop areas for CAUTION example, annual washing of energy transfer may be necessary to maintain latent transfer Disconnect electrical power before efficiency. Proper cleaning of the energy servicing energy recovery cassette. recovery wheel will restore latent Always keep hands away...

  • Page 92: Energy Recovery Wheel Defrost Timer Setting

    Soak in the solution until grease and tar deposits are loosened (Note: some staining of the desiccant may remain and is not harmful to performance). Before removing, rapidly run finger across surface of segment to separate polymer strips for better cleaning action.

  • Page 93: Table 27 - Electric And Gas Heating Capacities

    Should overheating occur with a gas heat If unit has not been selected as a 100% exchanger, or the gas supply fail to shut off, outside air unit (makeup air unit) the return shut off the manual gas valve to the furnace air duct must be sealed to the unit and the before shutting off the electrical supply.

  • Page 94: Electric Preheat

    Electric Preheat Flash Code LED Screen Controller Buttons Figure 54 - Preheat Controller The electric preheat controller is factory 4. RESETset - "Reset" air temperature (°F) installed within the preheat cabinet. The control setpoint. following details are for EHC1 version 1.10 of the preheat controller.

  • Page 95: System Setting Screens

    is 10sec. If ‘LLTset’ temperature is not 9. OAT - Outside air inlet temperature (°F). reached within ‘BelowLLT’ after reaching full output, the status relay will operate. 10. LATA - Leaving probe "A" temperature (°F). 3. Stages - Number of stages. Range = 1-6, and the default is 1.

  • Page 96: Led Flash Alarm Codes

    5. OATset - Outside air temperature 1 = LATA probe open/short setpoint. Range = 35°F-60°F, and the default is 35°F. 2 = LATB probe open/short 6. LLTset - “Low Limit Time” temperature setpoint. Range = 35°F-50°F, and the default is 35°F. If ‘LLTSet’ temperature 3 = OAT sensor open/short is not reached within ‘BelowLLT’...

  • Page 97: Operation

    Operation Electric preheat has maximum operating Controller receives 24VAC preheat enable outside air temperature of 60°F and a maximum preheat discharge air temperature Controller evaluates outside of 80°F. temperature “OAT” is below setpoint ‘OATset’ [COM], [PHO] & [PHC] feedback terminals are provided to communicate if the electric If OAT <...

  • Page 98: Table 29 - 6-8 And 10 Ton Gas Connections

    Table 31 - 14, 16-25 and 30 ton Gas Connections Model Connections Input Option Quantity Size 3/4” NPT 1” NPT Figure 55 - RN Series Gas Heat Exchanger Table 32 - 26 and 31-70 ton Gas Connections Model Connections Input Option Quantity Size 3/4” NPT 1-1/2”...

  • Page 99: Piping Sizing Examples

    Table 34 - Natural Gas (ft /hr) Maximum Piping Capacities Specific Gravity = 0.6, Supply Pressure ≤ 0.5 psi, Pressure Drop = 0.5” w.c. Length of Pipe Pipe Size 20 ft 50 ft. 100 ft. 150 ft. 200 ft. 1/2” 3/4”...

  • Page 100: Gas Pressure Regulator & Overpressure Protection Device

    Piping shall not be strained and 75-140 ton units, the heat exchanger or bent. condensate drain can be tied into the evaporator condensate drain, if code allows. AAON gas fired heat exchangers are designed to be non-condensing. These heat...
  • Page 101 exchangers are mounted downstream of the It is the responsibility of the end user or cooling coils. During the cooling season the contractor to determine if the condensate will ambient air inside the heat exchanger tubes damage the roofing material. can condense due to cold air being blown over the outside of the tubes.

  • Page 102: Figure 56 - Example 6-50, 60 & 70 Ton Through The Base Gas Piping

    Figure 56 - Example 6-50, 60 & 70 ton through the Base Gas Piping...

  • Page 103: Figure 57 - Example 55, 65 And 75-140 Ton For Across The Roof Gas Piping

    Figure 57 - Example 55, 65 and 75-140 ton for across the Roof Gas Piping Note: There will be two gas connections, one on each side of the unit...

  • Page 104: Leak Testing

    Leak Testing All components of gas supply system, CAUTION including manual shut off valves and the piping in the interior of the unit, shall be leak Some soaps used for leak detection tested with a soap solution before operating can be corrosive to certain metals. the appliance and at least on an annual basis Rinse piping thoroughly after leak test thereafter.

  • Page 105: Gas Heater Operating Instructions

    Gas Heater Operating Instructions Figure 58 - Gas Heater Instructions...

  • Page 106: Gas Heating Maintenance

    Cleaning shall only be done by a to the heating mode of operation. qualified service agency and only after consultation with AAON service The combustion ventilation motor will representative.

  • Page 107: Figure 59 - Gas Heat Exchanger

    Attach the heat exchanger to the bulkhead DANGER using the holes around the perimeter. LEAK CHECK GAS PIPE Connect flex gas lines to the piping on the heat exchanger. If flexible gas piping in the The gas pipe in the unit shall be unit must be replaced connectors cannot be checked for leaks before startup.

  • Page 108: Phase And Brownout Protection Module

    the setpoint parameters and the left arrow to Phase and Brownout Protection Module backup if needed. When each parameter is displayed use the up/down keys to change and set the parameter. After adjustments are made or if no adjustments are made it will take 2 to 4 minutes before the DPM energizes the output relay unless there is an out of tolerance issue with the incoming line voltage.
  • Page 109 Average Voltage Screen Screens VAvg Manufacturer’s Screen R-K Electronics DPM v0.0.00 Default – the default screen shows the real time voltage detected in each of the 3 phases: A-B B-C C-A Voltage Selection Screen (Vertical Format) Default = 460V, 3Ø 200, 1Ø;...

  • Page 110: Filter Replacement

    It is strongly recommended that filter media Filter Replacement Monthly air filter inspection is required to be replaced monthly. Filters are located maintain optimum unit efficiency. upstream of the evaporator coil in the filter and economizer section. Open access door and pull filters straight out to inspect all of the WARNING filters.

  • Page 111: Table 38 - 9 And 11-15 Ton Pre Filters

    Table 38 - 9 and 11-15 ton Pre Filters Feature 6A Quantity / Size Type No Pre Filters 4 / 20” x 25” x 2” A, E, F, H Pleated, MERV 8 2 / 20” x 25” x 1” B, E, G, H Metal Mesh, Outside Air 2 / 49”...

  • Page 112: Table 42 - 55, 65, And 75 Ton Pre Filters

    Table 42 - 55, 65, and 75 ton Pre Filters Feature Quantity / Size Type 0,B,C,F,G,H No Pre Filters 15 / 20” x 24” x 2” & A, E, F, 0,B,C,F,G,H Pleated, MERV 8 5 / 16” x 20” x 2” B, E, G, 28 / 20”...

  • Page 113: Table 45 - 6-8 And 10 Ton Unit Filters

    Table 45 - 6-8 and 10 ton Unit Filters Feature 6B Quantity / Size Type 4 / 16” x 20” x 2” with RAB, Feature A2 = Q, R Pleated, MERV 8 2 / 20” x 20” x 2” and 1/12”...

  • Page 114: Table 47 - 13 And 15 Ton Unit Filters

    Table 47 - 13 and 15 ton Unit Filters Feature 6B Quantity / Size Type 4 / 20” x 25” x 2” with RAB, Feature A2 = Q, R Pleated, MERV 8 6 / 12” x 24” x 2” 4 / 20” x 25” x 4” with RAB, Feature A2 = Q, R Pleated, MERV 8 6 / 12”...

  • Page 115: Table 49 - 26, 31, And 40 Ton Unit Filters

    8 / 24” x 24” x 4” with RAB, Feature A2 = Q, R Pleated, MERV 14 16 / 12” x 24” x 4” Table 50 - RN Series 50, 60, and 70 ton Unit Filters Feature 6B Quantity / Size Type 24 / 12”...

  • Page 116: Table 51 - 55, 65, And 75 Ton Unit Filters

    Table 51 - 55, 65, and 75 ton Unit Filters Feature 6B Quantity / Size Type 25 / 18” x 20” x 2” Pleated, MERV 8 15 / 20” x 24” x 4” & Pleated, MERV 8 5 / 16” x 20” x 4” Permanent Filter Frame - 25 / 18”...

  • Page 117: Table 54 - 9 And 11-15 Ton Energy Recovery Wheel Filters

    Table 54 - 9 and 11-15 ton Energy Recovery Wheel Filters Feature 1A Quantity / Size Type (Prior to August 2014) 2 / 16” x 20” x 4” (Prior to August 2014) With Energy Recovery Wheel Exhaust Air Filters, Feature 6A - D, F, G, H OA - 2 / 16”...

  • Page 118: Table 56 - 26, 31-50, 60, And 70 Ton Energy Recovery Wheel Filters

    Table 56 - 26, 31-50, 60, and 70 ton Energy Recovery Wheel Filters Feature 1A Quantity / Size Type (Prior to August 2014) 4 / 24” x 24” x 4” (After August 2014) With V-Bank Outside Air Filters OA - 8 / 24” x 18” x 2” With Outside Air Preheat 4 / 24”...

  • Page 119: Table 57 - 55, 65, And 75-140 Ton Energy Recovery Wheel Filters

    50, 60, and 70 ton Units Two Coils with Two Filter Layouts Figure 60 - RN Series 6-50, 60, and 70 ton Standard Filter Layouts All dimensions are in inches and are height x length. Layouts are viewed from the upstream side of the cooling coil.

  • Page 120: Replacement Parts

    90-140 ton Units, 2” Filters 90-140 ton Units, 4” Filters Figure 61 - RN Series 55, 65, 70-140 ton Standard Filter Layouts All dimensions are in inches and are height x length. Layouts are viewed from the upstream side of the cooling coil.

  • Page 121: Appendix A - Heat Exchanger Corrosion Resistance

    Appendix A - Heat Exchanger Corrosion Resistance Corrosion Resistance of Copper and Stainless Steel in Brazed Plate Heat Exchangers - Points to Measure and Check in a Water Analysis The resistance guide provides the corrosion resistance of stainless steel type AISI 316 and pure Copper (99.9%) in water, to a number of important chemical factors.
  • Page 122 Water Concentration Time Limits - AISI Copper Nickel Containing (mg/l or ppm) Analyze Before Alloy Alloy Total Hardness 4.0-8.5 No Limit (°dH) < 100 Nitrate (NO No Limit > 100 < 0.2 Iron (Fe) No Limit > 0.2 < 0.2 Aluminum (Al) No Limit >...

  • Page 123: Appendix B - Thermistor Temperature Vs. Resistance Values

    Appendix B - Thermistor Temperature vs. Resistance Values Deg C Deg F Resistance (kOhms) Deg C Deg F Resistance (kOhms) 2889.6 15.07 2087.22 12.73 1522.20 10.79 1121.44 9.20 834.72 7.87 627.28 6.77 475.74 5.85 363.99 5.09 280.82 4.45 218.41 3.87 171.17 3.35 135.14...

  • Page 124: Rn Series Startup Form

    RN Series Startup Form Date:______________ Job Name:___________________________________________________________________ Address:_____________________________________________________________________ ___________________________________________________________________________ Model Number:_______________________________________________________________ Serial Number:__________________________________________ Tag:_______________ Startup Contractor:____________________________________________________________ Address:_______________________________________________ Phone:_____________ ______________________________________________________ Pre Startup Checklist Installing contractor must verify the following items. 1. Is there any visible shipping damage? 2. Is the unit level? 3.
  • Page 125 Energy Recovery Wheel Assembly Wheel(s) Spin Freely Check Rotation FLA____________ Number Power Return/Exhaust Assembly Alignment Check Rotation Nameplate Amps________ Number Outside Air/Economizer Dampers Operation Check Damper Actuator Type: Economizer Changeover Type and Operations: Damper Wiring Check Gears Check Ambient Temperature Ambient Dry Bulb Temperature ________°F Ambient Wet Bulb Temperature ________°F Unit Configuration...
  • Page 126 Refrigeration System 1 – Cooling Mode Saturated Line Pressure Sub-cooling Superheat Temperature Temperature Discharge Suction Liquid Refrigeration System 2 – Cooling Mode Saturated Line Pressure Sub-cooling Superheat Temperature Temperature Discharge Suction Liquid Refrigeration System 3 – Cooling Mode Saturated Line Pressure Sub-cooling Superheat...
  • Page 127 Refrigeration System 4 – Heating Mode (Heat Pump only) Saturated Line Pressure Sub-cooling Superheat Temperature Temperature Discharge Suction Liquid Air-Cooled Condenser Alignment Check Rotation Nameplate Amps________ Number Water/Glycol System 1. Has the entire system been flushed and pressure checked? 2. Has the entire system been filled with fluid? 3.

  • Page 128: Maintenance Log

    This log must be kept with the unit. It is the responsibility of the owner and/or maintenance/service contractor to document any service, repair or adjustments. AAON Service and Warranty Departments are available to advise and provide phone help for proper operation and replacement parts.

  • Page 129: Maintenance Log (E-Coated Coil)

    Maintenance Log (E-Coated Coil)

  • Page 130: Literature Change History

    Update of the IOM adding information about 16-25 and 30 ton RN Series units. May 2009 Update of the IOM adding information about 9-15 ton RN Series units. The part number for the IOM was changed from R15710 to R79510.
  • Page 131 April 2011 Updated the condenser water connection sizes in Table I12 and added Table I13 – SMO 254 Brazed Plate Heat Exchanger Water Connections. June 2011 Updated 2” Pleated 30% efficiency filters from MERV 7 to MERV 8. March 2012 Updated manual to include 55, 65 and 75-140 unit sizes.
  • Page 132 Updated Metal Mesh Pre Filter quantity for RN-E cabinet. Updated RN-D cabinet energy recovery filters quantity and size for outside air preheat. April 2016 Added the Adjustable Fan Cycling Switch Procedure section. May 2016 Added the AAON Touchscreen Controller. June 2016 Packaged Direct Expansion (DX) Units section was updated for clarification.
  • Page 133 July 2016 Updated Neoprene statements and E-Coated Cleaning section. Table 29 - Acceptable Refrigeration Circuit Values has been updated. August 2016 Updated Energy Recovery Wheel Filters replacement Tables 49-52. Added Energy Recovery Wheel Defrost Timer section. September 2016 Added Power Exhaust Motor and Belt Removal section. January 2017 Added Two-Step Compressor options.

  • Page 134: Table 15 - Acceptable Fin & Tube Air-Cooled Condenser Coil Refrigeration Circuit Values

    January 2018 Updated the unit orientation on Figure 4 – RN Series E Cabinet. Added Figure 57 - Example 55, 65 and 75-140 ton for across the Roof Gas Piping. Updated tons on Gas Connections tables. Added Values, Table 15 - Acceptable Fin & Tube Air-Cooled Condenser Coil Refrigeration Circuit Table 16 - Acceptable Water-Cooled Refrigeration Circuit Values, Table 17 - Acceptable Microchannel Air-Cooled Condenser Coil Liquid Sub-Cooling Values.
  • Page 135 January 2021 Added Parallel Modulating Hot Gas Reheat options in Feature 8, Motorized Relief Damper options in Feature 17, Condenser Screen option in Feature 17, and changed Feature 18 to Electrical Rating with options for different kAIC values. Updated the RNE size lifting figure. Deleted the condenser coil guard section.
  • Page 136 Parts: For replacement parts please contact your local AAON Representative. It is the intent of AAON to provide accurate and current produc t information. However, in the interest of product improvement, AAON reserves the right to change pricing, specifications, and/or design of its...

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