AAON RN Series Installation, Operation & Maintanance Manual

AAON RN Series Installation, Operation & Maintanance Manual

Packaged rooftop units, heat pumps, & outdoor air handling units
Table of Contents

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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 should be kept
with the unit.
& Outdoor Air Handling Units
& Maintenance
RN SERIES
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 supplier's 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

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Summary of Contents for AAON RN Series

  • Page 1 RN SERIES 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 Safety .............................. 8 RN Series Feature String Nomenclature ..................13 General Information ........................24 Codes and Ordinances ......................24 Receiving Unit .......................... 25 Packaged Direct Expansion (DX) Units ................... 26 Gas or Electric Heating ......................27 Wiring Diagrams ........................28 Condensate Drain Pan .......................
  • Page 4 Replacement Parts ........................102 Appendix A - Heat Exchanger Corrosion Resistance ..............103 Appendix B - Thermistor Temperature vs. Resistance Values ........... 105 RN Series Startup Form ......................106 Maintenance Log ........................110 Literature Change History......................111 R90721 · Rev. B · 140725...
  • Page 5 Index of Tables and Figures Tables: Table 1 - Electric and Gas Heating Capacities ................27 Table 2 - A Cabinet Unit Clearances .................... 29 Table 3 - B Cabinet Unit Clearances .................... 29 Table 4 - C Cabinet Unit Clearances .................... 29 Table 5 - D Cabinet Unit Clearances ....................
  • Page 6 Figure 8 - RN Series 26, 31-50, 60, and 70 ton Unit Gasket Locations ........35 Figure 9 - Forklifting an RN Series A, B and C Cabinet, 6-25 and 30 tons ......... 36 Figure 10 - Lifting Details of a 6-25 and 30 ton Standard or Power Exhaust Unit ...... 37 Figure 11 - Lifting Details of a 6-25 and 30 ton Energy Recovery Wheel or Power Return Unit 37 Figure 12 - Lifting Details of a 26, 31-50, 60 and 70 ton Unit .............
  • Page 7 Figure 50 - Variable Capacity Compressor Controller ..............93 Figure 51 - Compressor Controller Flash Code Details ..............94 Figure 52 - RN Series 6-50, 60, and 70 ton Standard Filter Layouts ......... 101 Figure 53 - RN Series 55, 65, 70-140 ton Standard Filter Layouts ..........102...
  • Page 8: Safety

    Safety Attention should 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 9 WARNING WARNING FIRE, EXPLOSION OR CARBON ROTATING COMPONENTS MONOXIDE POISONING HAZARD Unit contains fans with moving parts Failure to replace proper controls that can cause serious injury. Do not could result in fire, explosion, or open door containing fans until the carbon monoxide poisoning.
  • Page 10 CAUTION CAUTION Electric motor over-current protection Rotation must be checked on all and overload protection may be a MOTORS AND COMPRESSORS of function of the Variable Frequency 3 phase units at startup by a qualified Drive to which the motors are wired. service technician.
  • Page 11 Failure of the condenser as a result of chemical corrosion is excluded Do not clean DX refrigerant coils with from coverage under AAON Inc. hot water or steam. The use of hot warranties and the heat exchanger water or steam on refrigerant coils manufacturer’s warranties.
  • Page 12 (ESP) as specified on the unit from coverage under AAON nameplate. warranties and the heat exchanger manufacturer warranties. 6. The supply and return air ducts must be derived from the same space. It is...
  • Page 13: Rn Series Feature String Nomenclature

    RN Series Feature String Nomenclature Model Options Unit Feature Options 0 2 5 BB 0 2 3 8 4 : A 0 0 0 D 0 B 0 BA 0 D 0 0 0 0 L 0 0 B 0 0 0 0 0 B –...
  • Page 14 RN Series Feature String Nomenclature Model Options Unit Feature Options – 0 2 5 – – – B B 0 2 – 3 8 4 : A 0 0 0 – D 0 B – D E H – 0 B A –...
  • Page 15 RN Series Feature String Nomenclature Model Options Unit Feature Options 0 2 5 B B 0 2 3 8 4 : A 0 0 0 D 0 B D E H 0 B A 0 D 0 0 0 0 L 0 0 B 0 0 0 0 0 B –...
  • Page 16 RN Series Feature String Nomenclature Model Options Unit Feature Options 0 2 5 B B 0 2 3 8 4 : A 0 0 0 D 0 B D E H 0 B A 0 D 0 0 0 0 L 0 0 B 0 0 0 0 0 B –...
  • Page 17 RN Series Feature String Nomenclature Model Options Unit Feature Options 0 2 5 B B 0 2 3 8 4 : A 0 0 0 D 0 B D E H 0 B A 0 D 0 0 0 0 L 0 0 B 0 0 0 0 0 B –...
  • Page 18 RN Series Feature String Nomenclature Model Options Unit Feature Options 0 2 5 B B 0 2 3 8 4 : A 0 0 0 D 0 B D EH 0 B A 0 D 0 0 0 0 L 0 0 B 0 0 0 0 0 B –...
  • Page 19 RN Series Feature String Nomenclature Model Options Unit Feature Options – 0 2 5 – – – B B 0 2 – 3 8 4 : A 0 0 0 – D 0 B – D E H – 0 BA –...
  • Page 20 RN Series Feature String Nomenclature Model Options Unit Feature Options 0 2 5 B B 0 2 3 8 4 : A 0 0 0 D 0 B D E H 0 B A 0 D 0 0 0 0 L 0 0 B 0 0 0 0 0 B –...
  • Page 21 RN Series Feature String Nomenclature Model Options Unit Feature Options 0 2 5 B B 0 2 3 8 4 : A 0 0 0 D 0 B D E H 0 B A 0 D 0 0 0 0 L 0 0 B 0 0 0 0 0 B –...
  • Page 22 B = JENEsys Control System with Web UI C = WattMaster Orion VCM-X Controls System with Specials E = Remote Mounted AAON Mini Controller F = JENEsys Control System with Web UI + Fox G = JENEsys Control System with Web UI + Lon...
  • Page 23 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 4 = Standard Paint + 5 Year Parts Only Warranty...
  • Page 24: General Information

    Codes and Ordinances efficiency. RN Series units have been tested and certified, by ETL, in accordance with UL Certification of Gas Heat Models Safety Standard 1995/CSA C22.2 No. 236, a.
  • Page 25: Receiving Unit

    Installation of RN Series units must conform transit. If damage is found it should be noted to the ICC standards of the International on the carrier’s freight bill. A request for Mechanical Code, the International Building inspection by carrier’s agent should be made Code, and local building, plumbing and in writing at once.
  • Page 26: Packaged Direct Expansion (Dx) Units

    The warranty card must be completed in full CAUTION and returned to AAON not more than 3 months after unit is delivered. CRANKCASE HEATER OPERATION Storage If installation will not occur immediately Some units equipped with following delivery, store equipment in a dry...
  • Page 27: Gas Or Electric Heating

    concentration builds up, oil is washed out of cooling mode or off. Do not leave part of the the compressor, leaving it starved for units switched to the opposite mode. lubrication. Cooling only units should be switched off at the thermostat during the heating season. The compressor life will be seriously shorted by reduced lubrication and the Gas or Electric Heating...
  • Page 28: Wiring Diagrams

    Gas Heat Electric Heat Input Capacity Output Capacity Capacity Model Option B2 kW (230V, 380V kW (208V) 460V, 575V) 1 = Heat 1 60.0 48.0 2 = Heat 2 90.0 72.0 15.0 3 = Heat 3 100.0 80.0 22.5 4 = Heat 4 270.0 218.7 30.0...
  • Page 29: Installation

    Installation Flue gas is dangerously hot and contains 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 should be mounted first and must Code, B149.1 specifies a 6 ft.
  • Page 30: Setting The Curb

    (Controls Side) Right Side Front Back - (Outside Air) 48” Left Side 72” Figure 2 - RN Series A, B and C Cabinet, Right Side 72” 6-25 and 30 tons Unobstructed Table 5 - D Cabinet Unit Clearances Unit Size...
  • Page 31 CAUTION All roofing work should be performed by competent roofing contractors to avoid any possible leakage. CAUTION Where the supply or warm air duct passes through a combustible roof, a clearance inch must maintained between outside edges of the duct and combustible material in accordance with National Fire Protection Association Standard 90A.
  • Page 32: Figure 5 - Rn Series 6-8 And 10 Ton Unit Gasket Locations

    Figure 5 - RN Series 6-8 and 10 ton Unit Gasket Locations...
  • Page 33: Figure 6 - Rn Series 9 And 11-15 Ton Unit Gasket Locations

    Figure 6 - RN Series 9 and 11-15 ton Unit Gasket Locations...
  • Page 34: Figure 7 - Rn Series 16-25 And 30 Ton Unit Gasket Locations

    Figure 7 - RN Series 16-25 and 30 ton Unit Gasket Locations...
  • Page 35: Figure 8 - Rn Series 26, 31-50, 60, And 70 Ton Unit Gasket Locations

    Figure 8 - RN Series 26, 31-50, 60, and 70 ton Unit Gasket Locations...
  • Page 36: Forklifting The Unit (6-25 And 30 Ton)

    Forks or Fork Extensions must be at least 48” in length. Forks Figure 9 - Forklifting an RN Series A, B and C Cabinet, 6-25 and 30 tons It is recommended to lift the unit with the Lifting the Unit...
  • Page 37: Figure 10 - Lifting Details Of A 6-25 And 30 Ton Standard Or Power Exhaust Unit

    Hoist unit to a point directly above the curb until the unit skirt fits around the curb. Some and duct openings. Be sure that the gasket units are designed to overhang the curb. material has been applied to curb. Take care that any recessed base rails fit around the curb.
  • Page 38: Figure 12 - Lifting Details Of A 26, 31-50, 60 And 70 Ton Unit

    Figure 12 - Lifting Details of a 26, 31-50, 60 and 70 ton Unit Figure 13 - Lifting Details of a 55, 65 and 75-140 ton Unit...
  • Page 39: 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 Do not drill or punch holes in the unit (6-25 and 30 tons), the unit should base of the unit, from inside the unit include the base insulation option or the or from below the unit to attach base must be field insulated.
  • Page 40: 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.
  • Page 41: Figure 16 - Seismic Solid Bottom Curb Without Filters Cross Section

    Figure 16 - Seismic Solid Bottom Curb without Filters Cross Section Figure 17 - Seismic Solid Bottom Curb without Filters Detail A Figure 18 - Seismic Solid Bottom Curb without Filters Detail B...
  • Page 42: Figure 19 - Seismic Rigid Mount Curb

    Figure 19 - Seismic Rigid Mount Curb...
  • Page 43: Figure 20 - 90-140 Ton Condenser Coil Guard Installation Instructions 1

    Condenser Hail Guards 90-140 ton Units Condenser hail guards fold down and become a condenser coil shipping cover on 90-140 ton RN Series units with copper tube aluminum condenser coils. Condenser hail guards must be opened before startup of the unit.
  • Page 44: Outside Air Rain Hood

    Figure 21 - 90-140 ton Condenser Coil Guard Installation Instructions 2 Outside Air Rain Hood side pieces of the hood to the top of the Rain hood must be opened before startup of hood. the unit. Fresh air intake adjustments should be made according to building ventilation of Rotate the side pieces so that the holes along local code requirements.
  • Page 45: End Flashing Installation

    Open Rain Hood End Flashing Installation Figure 22 - 6-25 and 30 ton On RN Series E cabinet units that are 142” Closed Rain Hood wide (RN-55, 65, 75, 90, 105, 120, 130, 140) the cabinet width will overhang the shipping trailer on each side.
  • Page 46: Metal Mesh Filters (6-25 And 30 Ton Units)

    Metal Mesh Filters (6-25 and 30 ton Units) Metal mesh outside air filters require installation of the filter rack on the intake of the rain hood. Clips which hold the metal mesh filters in the filter rack should face outward. Figure 25 - Factory Supplied End Flashings CAUTION In order to prevent water leakage into...
  • Page 47: Electrical

    Electrical Verify the unit nameplate agrees with power supply. Connect power and control wiring to the unit as shown in Figure I12 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.
  • Page 48: Figure 29 - Front View Of Utility Entry And Power Switch From Control Compartment

    without effecting the unit’s agency/safety certification. Supply voltage must be within the min/max range shown on the unit nameplate. Available short circuit current should not exceed the short circuit current rating (SCCR) shown on the unit nameplate. CAUTION Three phase voltage imbalance will cause motor overheating...
  • Page 49: Variable Speed Compressors

    Table 7 - Variable Speed Compressor VFD CAUTION Frequency Range Compressor VFD Model (RN-) Rotation must be checked on all Range (Hz) MOTORS AND COMPRESSORS of 208V, 230V and 380V Units three phase units. Supply fan, 055, 065 & 075-140 35-60 Hz exhaust fan,...
  • Page 50: Gas Heating

    Total Wire Distance Allowable = Gas piping must be installed in accordance (Quantity of Control Wires) x with local codes, or in the absence of local (Control Wire Distance) codes, installation must conform to the current (United States) National Fuel Gas Take the total wire distance allowable and Code ANSI-Z223.1/NFPA 54 or the current divide by the quantity of wires to be...
  • Page 51: Piping Sizing Examples

    Figure 30 - RN Series Gas Heat Exchanger input rate. Table 14 - Natural Gas (ft /hr) Maximum Piping Capacities Specific Gravity = 0.6, Supply Pressure ≤...
  • Page 52: Inlet And Manifold Pressures

    Gas Pressure Regulator & Overpressure × 1080 1080 ft Protection Device 1000 A gas pressure regulator must be installed if natural gas supply pressure to the unit is From the natural gas maximum capacities greater than 10.5” w.c. and less than 2 psi table, at 100 ft and 1080 ft /hr the required (55.4”...
  • Page 53: Leak Testing

    petroleum gases. If flexible gas piping to the The condensate drain connection is located unit, or in the unit, must be replaced next to the gas entry location. For 6-50, 60 connectors cannot be reused, only new and 70 ton units, the heat exchanger connectors may be used.
  • Page 54: Refrigerant-To-Water Heat Exchanger

    operating the appliance and at least on an will be under the acceptable level of annual basis thereafter. concentration for human occupancy. DANGER WARNING LEAK CHECK GAS PIPE Those sensitive to odors or gases The gas pipe in the unit should be from trace amounts of residual oils checked for leaks before startup.
  • Page 55: Freezing Water In The Heat Exchanger

    Resistance more Failure of the condenser as a result of information. chemical corrosion excluded from coverage under AAON warranties and the Freezing Water in the Heat Exchanger heat exchanger manufacturer warranties. This product contains more refrigerant-to-water heat exchangers. A Failure of the condenser will allow water to...
  • Page 56: Water Piping

    AAON warranties and the heat exchanger manufacturer warranties. WARNING Unit is capable of operating with Entering WATER PRESSURE Water Temperatures (EWT) as low as 57°F,...
  • Page 57: Table 18 - Standard Brazed Plate Heat Exchanger Water Connections

    Table 18 - Standard Brazed Plate Heat in the cooling tower, these minerals remain. Exchanger Water Connections As the mineral content of the water increases, the conductivity of the water Supply and Return Model (RN-) increases. Connection Size 006, 007 1”...
  • Page 58: Condensate Drain Piping

    Condensate Drain Piping CAUTION 6-25 and 30 ton units are equipped with one condensate drain pan connection, on the Each heat exchanger is equipped right side of the unit, and are furnished with with a refrigerant pressure relief a p-trap for field installation. 26 and 31-140 device to relieve pressure should ton units are equipped with two condensate excessive...
  • Page 59: Heating Coils

    Condensate drain trapping and piping should Table 22 - Chilled Water Coil Connection conform to all applicable governing codes. Sizes Chilled Water Heating Coils Model (RN-) Coil Connection One or two row hot water and steam heating Size and preheating coils can be factory installed. 006, 007, 008, 009, 010, 1 5/8”...
  • Page 60: Electric Preheat

    Electric Preheat Flash Code LED Screen Controller Buttons Figure 32 - Preheat Controller The electric preheat controller is factory 3. LATset - Leaving air temperature (°F) installed within the preheat cabinet. The control setpoint. following details are for EHC1 version 1.10 of the preheat controller.
  • Page 61: System Setting Screens

    6. LLTset “Low Limit Time” 11. LATB Leaving probe "B" temperature (°F) setpoint. this temperature (°F). temperature is not reached at full output, relay will pull in. 12. ManSTG - Manual override stage for system testing. override automatically cancels after ten minutes; 7.
  • Page 62: Table 23 - Stages Of Electric Preheat

    2. BelowLLT - "Below Low Limit Time". 4. LATset - Leaving air temperature Range = 10sec-1800sec, and the default setpoint. Range = 35°F-80°F, and the is 10sec. If ‘LLTset’ temperature is not default is 50°F. reached within ‘BelowLLT’ after reaching full output, the status relay will operate.
  • Page 63: Led Flash Alarm Codes

    expire in ten minutes if not manually 5 = Cooling down after hi limit’ event cancelled by resetting ‘ManSTG’ back to zero. 6 = LAT below low limit LED Flash Alarm Codes The flashing red LED will be to the right of the screen.
  • Page 64: Energy Recovery Units

    maintain the setpoint ‘LATset’ to a [PHE] is the electric preheat operation maximum number of stages set in setpoint enable. [PH+] and [PH-] are the preheat set ‘Stages’. point reset terminals. If a safety is reached with the controller’s Energy Recovery Units safety sensors then the electric preheat will WARNING be de-energized for a period of 2 minutes.
  • Page 65 The initial setup and servicing of the energy Air Seal Adjustments recovery wheel is very important to maintain Pile type air seals across both sides of the proper operation efficiency and building energy wheel diameter are factory adjusted occupant comfort. to provide close clearance between the air seal and wheel.
  • Page 66 at a time to provide slip fit clearance when rigging shown following the wheel is rotated by hand. illustration. Confirm that the wheel rotates freely. Apply power to the unit and confirm rotation. Airflow Balancing and Checking High performance systems commonly have complex air distribution and fan systems.
  • Page 67 A characteristic of all dry desiccants, such to separate polymer strips for better cleaning films can close off micron sized pores at the action. Rinse dirty solution from segment surface of the desiccant material, reducing and remove excess water before reinstalling the efficiency by which the desiccant can in wheel.
  • Page 68 Installation Considerations This amount of racking can be compensated Energy recovery cassettes are incorporated for by adjusting the diameter seals. within the design of packaged units, packaged air handlers and energy recovery If greater than 1/4 inch (dimension C), ventilators. In each case, it is recommended racking must be corrected to ensure that that following...
  • Page 69 Segment Installation & Replacement Wheel segments are secured to the wheel frame by a Segment Retainer which pivots on the wheel rim and is held in place by a Segment Retaining Catch. Diameter Seal Adjustment Segment Retainer To install wheel segments follow steps one through five below.
  • Page 70 center of the wheel and inwards against the collar in the direction of wheel rotation to spoke flanges. If hand pressure does not unlock collar. Remove collar. fully seat the segment, insert the flat tip of a 3. Using socket wrench with extension, screw driver between the wheel rim and remove two nuts which secure bearing outer corners of the segment and apply...
  • Page 71 12. Apply power to wheel and ensure that the wheel rotates freely without interference. Belt Replacement...
  • Page 72: Startup

    Supply Fans provided on the wheel. Once the band has RN Series units are equipped with direct been inserted into the slots, it MUST BE drive backward...
  • Page 73: Power Return Axial Flow Fans (16-25 And 30 Tons)

    Use the fan program in AAON ECat. 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.
  • Page 74: Figure 34 - Fan With The Hub On The Top And Ret On The Bottom

    Step 5: Determine the pin location groove Bushing Disassemble fan on a flat surface and note in Mount which groove the pin is located. Figure 34 - Fan with the HUB on the Top 1 2 3 4 and RET on the Bottom Step 3: Determine the direction of rotation Right, R, is clockwise when facing the Figure 36 - RET with Pin in Groove 4...
  • Page 75: Power Return And Exhaust Axial Flow Fans (26 And 31-140 Tons)

    Step 3: Remove the mounting nuts and bolts the fan blades and separate hub plate castings Use the fan program in AAON ECat. Contact the AAON parts department to acquire the new pitch pins for the fan blades. Step 2: Maintain the balance of fan...
  • Page 76: Filters

    Step 4: Remove the fan blades and replace Step 5: Replace the fan blades with the pitch the pitch pins pin of the blade in the same groove and reassemble the fan. Replace the blades and assemble the fan making sure to place the blades in their previous blade sockets, to match up the Pin Groove previous orientation of hub plate casings and...
  • Page 77: Checking Liquid Sub-Cooling

    Read the gauge pressure at the liquid line CAUTION close to the point where the temperature was taken. You must use liquid line pressure as it The Clean Air Act of 1990 bans the will vary from discharge pressure due to intentional venting refrigerant...
  • Page 78: Adjusting Sub-Cooling And Superheat Temperatures

    Table 26 - Acceptable Refrigeration The system is undercharged if the superheat Circuit Values is too high and the sub-cooling is too low Air-Cooled Cond./Air-Air Heat Pump Correct an undercharged system by adding Sub-Cooling 12-18°F refrigerant to the system to reduce superheat Sub-Cooling with 15-22°F and raise sub-cooling.
  • Page 79: Table 27 - R-410A And R-22 Refrigerant Temperature-Pressure Chart

    Table 27 - 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 80: Gas Heater Instructions

    Gas Heater Instructions Figure 43 - Gas Heater Instructions...
  • Page 81: Condenser Fan Electronically Commutated Motor (Ecm) Startup

    Condenser Fan Electronically WattMaster Condenser Head Pressure Module. See WattMaster literature for Commutated Motor (ECM) Startup The fan cycling option uses a fan cycle further information. switch to switch between one of the discrete (http://www.orioncontrols.com) speed inputs (see Table 28) on the motor thus cycling between two preset speeds With JENEsys Unit Controls the controller based upon discharge pressure of the unit.
  • Page 82: Vfd Controlled Condenser Fan Startup

    VFD Controlled Condenser Fan Startup With Customer Provided Unit Controls the VFD’s are factory provided and factory programmed. VFD’s receives input from pressure transducers on each refrigerant circuit and vary the fan speed based on the pressure inputs to maintain a discharge (head) pressure.
  • Page 83: Operation

    Packaged DX Cooling Operation and Operation Control When a call for cooling (G and Y1, Y2, etc.) Unit operations should be controlled with is made the supply blower motors and thermostat, or unit controller, never at the compressors will energize. main power supply, except for servicing, emergency, or complete shutdown of the unit.
  • Page 84: Electric Heating Operation

    or by an auxiliary limit mounted in the supply fan compartment. Electric Heating Operation When a call for heating (G and W1, W2, etc.) is made the supply blower motors and electric resistance heaters will energize. Heating accomplished passing electrical current through a specified amount of resistance heaters which will produce the required heat.
  • Page 85: Maintenance

    Cleaning should only be done by a operate. The control will automatically qualified service agency and only after supply energy to the igniter and the gas consultation with AAON service valve after the heating call is made. representative.
  • Page 86: Gas Heat Exchanger Removal

    If induced draft blower/motor assembly has Insert heat exchanger into opening so that to be replaced, care must be taken to provide the back of the main plate is against the unit an airtight seal between the blower housing bulkhead. and the burner box.
  • Page 87: Condensate Drain Pans

    WARNING Electric shock hazard. Shut off all electrical power to the unit to avoid shock hazard or injury from rotating parts. WARNING Improper installation, adjustment, alteration, service, or maintenance cause property damage, personal injury, or loss of life. Startup Figure 45 - Removal of a Condenser Fan and service must be performed by a Assembly Factory Trained Service Technician.
  • Page 88: Evaporator Coil (6-25 And 30 Ton)

    Evaporator Coil (6-25 and 30 ton) Reinstallation 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 89: E-Coated Coil Cleaning

    must be rinsed with clean water. A solution is than 900 psig to avoid damaging the fin of 1-2% sodium hydroxide (NaOH) or edges. An elevated water temperature (not to sodium bicarbonate (NaHCO) before the last exceed 130°F) will reduce surface tension, rinse ensures that all acid is neutralized.
  • Page 90: Microchannel Coil Cleaning

    Recommended Coil Cleaner recommended to be of potable quality, The following cleaning agent, assuming it is though a lesser quality of water may be used used in accordance with the manufacturer’s if a small amount of CHLOR*RID DTS is directions on the container for proper mixing added.
  • Page 91: Supply Fans

    Supply Fans Remove wire connections from Auxiliary Limit Switch (if applicable) which WARNING is mounted in the brace at the fan opening. Electric shock hazard. Shut off all Remove the brace located at the fan electrical power to the unit to avoid opening.
  • Page 92: Phase And Brownout Protection

    used to help accomplish this. Use the pry After selecting single or three phase set the slots on the back side of the motor mount. knob to the percentage of Over or Under voltage desired. A typical over and under Pull the motor mount to the edge of the voltage percentage is 10%.
  • Page 93: Variable Capacity Compressor Controller

    Phase Loss LED = Green compressor controller, see Emerson Climate 5. On/Off LED = Green Bulletin AE8-1328. Phase Loss LED = Green Powering up with no voltage present: 1. On/Off LED = Alternating Green/Red Phase Loss LED = Out Going into trip condition after operating conditions were good: 1.
  • Page 94: Filter Replacement

    signal of the system. The following table protects compressor against high shows the linear relationship between the discharge temperature. Refer to Appendix B demand signal and compressor capacity for the relationship between thermistor modulation. The compressor controller temperature readings and resistance values. Table 29 - Demand Signal vs.
  • Page 95: Table 30 - 6-8 And 10 Ton Pre Filters

    Table 30 - 6-8 and 10 ton Pre Filters Feature 6A Quantity / Size Type No Pre Filters 4 / 16” x 20” x 2” Pleated, 30% Eff, MERV 8 2 / 16” x 20” x 1” Metal Mesh, Outside Air 2 / 40”...
  • Page 96: Table 34 - 50, 60, And 70 Ton Pre Filters

    Table 34 - 50, 60, and 70 ton Pre Filters Feature 6A Quantity / Size Type No Pre Filters 24 / 12” x 24” x 2” Pleated, 30% Eff, MERV 8 6 / 16” x 25” x 1” Metal Mesh, Outside Air with PE or PR, Feature 1A = B, C 4 / 16”...
  • Page 97: Table 37 - 26, 31-50, 60, And 70 Ton Preheat Filters

    Table 37 - 26, 31-50, 60, and 70 ton Preheat Filters Feature Quantity / Size Type 6 / 16” x 25” x 1” A, B, C, A, B, C, Metal Mesh, Outside Air D, E, F with PE or PR, Feature 1A = B, C 4 / 16”...
  • Page 98: Table 40 - 13 And 15 Ton Unit Filters

    Table 40 - 13 and 15 ton Unit Filters Feature 6B Quantity / Size Type 4 / 20” x 25” x 2” Pleated, 30% Eff, MERV 8 with RAB, Feature A2 = Q, R 6 / 12” x 24” x 2” 4 / 20”...
  • Page 99: Table 42 - 26, 31, And 40 Ton Unit Filters

    Table 42 - 26, 31, and 40 ton Unit Filters Feature 6B Quantity / Size Type 8 / 24” x 24” x 2” Pleated, 30% Eff, MERV 8 with RAB, Feature A2 = Q, R 16 / 12” x 24” x 2” 8 / 24”...
  • Page 100: Table 45 - 90-140 Ton Unit Filters

    Table 45 - 90-140 ton Unit Filters Feature 6B Quantity / Size Type 35 / 18” x 20” x 2” Pleated, 30% Eff, MERV 8 21 / 20” x 24” x 4” & Pleated, 30% Eff, MERV 8 7 / 16” x 20” x 4” Permanent Filter Frame - 35 / 18”...
  • Page 101: Table 49 - 26, 31-50, 60, And 70 Ton Energy Recovery Wheel Filters

    50, 60, and 70 ton Units Two Coils with Two Filter Layouts Figure 52 - 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 102: Replacement Parts

    90-140 ton Units, 2” Filters 90-140 ton Units, 4” Filters Figure 53 - 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 103: 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 104 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 105: 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 106: 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 should verify the following items. 1. Is there any visible shipping damage? 2. Is the unit level? 3.
  • Page 107 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 108 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 109 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 110: 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 111: 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 112 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 116 Maintenance R90721 · Rev. B · 140725 It is the intent of AAON to provide accurate and current product information. However, in the interest of product improvement, AAON reserves the right to change pricing, specifications, and/or design of its product without notice, obligation, or liability.

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