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AAON RN Series Installation, Operation & Maintanance Manual Download Page 73

 

73 

 

 
 

 

 

 

 

 

Figure 33 - Supply Fan Banding 

 

Power Return Axial Flow Fans (16-25 and 
30 tons) 

Blade Pitch Angle Setting Instructions 
 

Step 1: Determine the new required pitch for 
the fan blades 

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. 
 
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.  
 
Number the blades and blade sockets, so that 
they  can be  replaced into their original 
positions. 
 

Summary of Contents for RN Series

Page 1: ...om 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 S...

Page 2: ......

Page 3: ...nd 30 ton Units 46 Electrical 47 Variable Speed Compressors 49 Thermostat Control Wiring 49 Gas Heating 50 Piping Sizing Examples 51 Inlet and Manifold Pressures 52 Gas Pressure Regulator Overpressure...

Page 4: ...r Hot Water Preheating and Heating Operation 84 Modulating Electric Preheat 84 Chilled Water or Non Compressorized DX Cooling Operation 84 Maintenance 85 Gas Heating 85 Gas Heat Exchanger Removal 86 D...

Page 5: ...able 19 SMO 254 Brazed Plate Heat Exchanger Water Connections 57 Table 20 Steam Coil Connection Sizes 59 Table 21 Hot Water Coil Connection Sizes 59 Table 22 Chilled Water Coil Connection Sizes 59 Tab...

Page 6: ...30 ton Energy Recovery Wheel or Power Return Unit37 Figure 12 Lifting Details of a 26 31 50 60 and 70 ton Unit 38 Figure 13 Lifting Details of a 55 65 and 75 140 ton Unit 38 Figure 14 Duct Connection...

Page 7: ...76 Figure 43 Gas Heater Instructions 80 Figure 44 Gas Heat Exchanger 86 Figure 45 Removal of a Condenser Fan Assembly 87 Figure 46 Evaporator Coil Access 88 Figure 47 9 25 and 30 ton Supply Fan 91 Fi...

Page 8: ...lt in dangerous operation serious injury death or property damage Before servicing disconnect all electrical power to the furnace More than one disconnect may be provided When servicing controls label...

Page 9: ...to the unit has been disconnected and fan wheel has stopped rotating WARNING During installation testing servicing and troubleshooting of the equipment it may be necessary to work with live electrical...

Page 10: ...checked using suction and discharge gauges Fan motor rotation should be checked for proper operation Alterations should only be made at the unit power connection CAUTION Failure to properly drain and...

Page 11: ...rdware with a pad lock always re install the nut bolt after closing the door CAUTION Do not clean DX refrigerant coils with hot water or steam The use of hot water or steam on refrigerant coils will c...

Page 12: ...truction setup Verify furnace operating conditions including input rate temperature rise and ESP 8 Every unit has a unique equipment nameplate with electrical operational and unit clearance specificat...

Page 13: ...3 60Hz 4 575V 3 60Hz 6 380V 3 50Hz 8 208V 3 60Hz 9 208V 1 60Hz 0 Standard Vertical Discharge and Return INTERIOR PROTECTION A Interior Corrosion Protection Vertical Discharge and Return Model Option...

Page 14: ...4 Stage 1 Stage Auxiliary Heat E Modulating Lead VCC 1 Stage Aux Heat F Modulating All VCC 1 Stage Aux Heat H Single Serpentine 8 fpi J Half Serpentine 8 fpi K Single Serpentine 10 fpi L Half Serpenti...

Page 15: ...Serpentine 12 fpi N Half Serpentine 12 fpi Feature 1 RETURN OUTSIDE AIR 0 Manually Adjustable OA Opening RA Opening 1A RETURN OUTSIDE AIR SECTION A Economizer B Econ Power Exhaust C Econ Power Return...

Page 16: ...kward Curved Plenum D 22 Backward Curved Plenum F 27 Backward Curved Plenum G 22 Direct Drive Axial Flow H 35 5 Direct Drive Axial Flow J 15 BC Plenum 50 Width with Banding K 18 5 BC Plenum 70 Width w...

Page 17: ...Enthalpy CO2 Override R DDC Actuator CO2 Override S Dual Minimum Position Potentiometers Fully Mod Act Sensible Limit T Dual Minimum Position Potentiometers Fully Mod Act Enthalpy Limit U 2 Position...

Page 18: ...Backward Curved Plenum N 13 5 BC Plenum 70 Width P 24 BC Plenum 60 Width Q 27 BC Plenum 60 Width R 22 Backward Curved Plenum S 22 BC Plenum 70 Width T 17 Backward Curved Plenum U 17 BC Plenum 70 Widt...

Page 19: ...E 2 Options C D E 3 Options A B C D 4 Options A B C E 5 Options A B D E 6 Options A C D E 7 Options B C D E 8 Options A B C D E 0 Standard Feature 8 REFRIGERATION OPTIONS A Hot Gas Bypass Lead Stage o...

Page 20: ...Options A H K Options B H L Options C H M Options D H N Options A B H P Options A C H Q Options A B C H 0 Standard Feature 12 CONTROLS A Low Limit Controls B Phase and Brown Out Protection C Energy Re...

Page 21: ...Zone Unit Controller VAV Cool VAV Heat 4 Field Installed DDC Controls by Others 5 Field Installed DDC Controls Furnished by Others with Isolation Relays 6 Factory Installed DDC Controls Furnished by O...

Page 22: ...Standard None Feature 21 WATER COOLED CONDENSER A Balancing Valves B Water Flow Switch C Motorized Shut off Valve D Head Pressure Control E Options A B F Options A C G Options A D H Options B C J Opt...

Page 23: ...BB 0 2 3 8 4 A0 0 0 D 0 B DEH 0 BA 0 D 0 0 0 0 L 0 0 0 0 B 0 0 0 0 0 B GEN Model Options Unit Feature Options B Standard AAON Gray Paint Feature 23 TYPE U Special Pricing Authorization Special Paint X...

Page 24: ...hout cooling b Certified for outdoor installation only c Certified for installation on a combustible roof with a minimum of 12 high curb Certification of Cooling Models a Certified as a commercial cen...

Page 25: ...b requirements If repairs must be made to damaged goods then the factory should be notified before any repair action is taken in order to protect the warranty Certain equipment alteration repair and m...

Page 26: ...e may occur when power is restored If power to the unit must be off for more than an hour turn the thermostat system switch to OFF or turn the unit off at the control panel and leave the unit off unti...

Page 27: ...air while operating If this amount of air is greatly reduced approximately 1 3 during the heating season the gas heat exchanger or electric heating coil may overheat and may cut the burner or heater...

Page 28: ...0 1920 0 Wiring Diagrams Unit specific wiring diagrams are laminated and affixed inside the controls compartment door Condensate Drain Pan Unit requires drain traps to be connected to the condensate d...

Page 29: ...Location Unit Size 6 8 and 10 tons Front Controls Side 48 Back Outside Air 36 Left Side 6 Right Side 48 Top Unobstructed Units with a water cooled condenser or chilled water coil require 48 of cleara...

Page 30: ...c heating Units with hydronic heating require 70 right side access for service Figure 3 RN Series D Cabinet 26 31 50 60 and 70 tons Table 6 E Cabinet Unit Clearances Location Unit Size 55 65 and 75 14...

Page 31: ...inch must be maintained between the outside edges of the duct and combustible material in accordance with National Fire Protection Association Standard No 90A Provide flashings or enclosure between st...

Page 32: ...32 Figure 5 RN Series 6 8 and 10 ton Unit Gasket Locations...

Page 33: ...33 Figure 6 RN Series 9 and 11 15 ton Unit Gasket Locations...

Page 34: ...34 Figure 7 RN Series 16 25 and 30 ton Unit Gasket Locations...

Page 35: ...35 Figure 8 RN Series 26 31 50 60 and 70 ton Unit Gasket Locations...

Page 36: ...d 30 tons Lifting the Unit If cables or chains are used to hoist the unit they must be the same length Minimum cable length is 99 for 6 25 and 30 ton units and 180 for 26 and 31 50 60 and 70 ton units...

Page 37: ...Lower the unit until the unit skirt fits around the curb Some units are designed to overhang the curb Take care that any recessed base rails fit around the curb Make sure the unit is properly seated o...

Page 38: ...38 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: ...ld include the base insulation option or the base must be field insulated D and E cabinet 26 and 31 140 tons units include base insulation standard Figure 14 Duct Connection Do not drill or punch hole...

Page 40: ...to ICC ES AC156 when using a seismic curb for seismic certifications to apply Any deviations or modifications to the unit or curb will void all seismic certification Structural engineer of record mus...

Page 41: ...41 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: ...42 Figure 19 Seismic Rigid Mount Curb...

Page 43: ...old down and become a condenser coil shipping cover on 90 140 ton RN Series units with copper tube and aluminum fin condenser coils Condenser hail guards must be opened before startup of the unit Figu...

Page 44: ...quirements 6 25 and 30 ton Units Remove the two screws at the bottom of the rain hood that secure it in the shipping position Remove the screws that attach the side pieces of the hood to the top of th...

Page 45: ...n Rain Hood 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...

Page 46: ...the intake of the rain hood Clips which hold the metal mesh filters in the filter rack should face outward Figure 26 Rain Hood with Metal Mesh Filter Rack Installation In order to prevent water leakag...

Page 47: ...e unit base in the front left hand corner in the unit controls compartment The utility entry on 55 65 and 75 140 ton units is located in the center front of the unit See unit drawing for specific loca...

Page 48: ...nt has been completed by the manufacturer and cannot be modified without effecting the unit s agency safety certification Supply voltage must be within the min max range shown on the unit nameplate Av...

Page 49: ...per operation Control voltage returning from controller circuit must be a minimum of 21 VAC To assure proper wiring use the following chart to determine the allowable wiring distances Table 8 Control...

Page 50: ...in accordance with local codes or in the absence of local codes installation must conform to the current United States National Fuel Gas Code ANSI Z223 1 NFPA 54 or the current Canada National Fuel P...

Page 51: ...5 160 135 1 1 4 950 580 400 325 280 1 1 2 1460 900 620 500 430 2 2750 1680 1150 950 800 2 1 2 4350 2650 1850 1500 1280 Table 15 Propane kBtu hr Maximum Piping Capacities Specific Gravity 1 52 Supply P...

Page 52: ...3 w c and less than 2 psi 55 4 w c Regulators must comply with the latest edition of the Standard for Line Pressure Regulators ANSI Z21 80 CSA 6 22 Both a gas pressure regulator and overpressure prote...

Page 53: ...tions The condensate drain connection is located next to the gas entry location For 6 50 60 and 70 ton units the heat exchanger condensate drain connection from the unit is a 5 8 barbed nylon elbow co...

Page 54: ...r loop temperature of 70 F Open Loop Applications This product contains one or more refrigerant to water heat exchangers made of 316 Stainless Steel 316 Stainless Steel is subject to severe corrosion...

Page 55: ...ore refrigerant to water heat exchangers A refrigerant to water heat exchanger contains refrigerant in one passage and water in another passage Water is subject to freezing at 32 F When water freezes...

Page 56: ...e Glycol Propylene Glycol 20 18 F 19 F 30 7 F 9 F 40 7 F 6 F 50 28 F 27 F Water loop piping runs through unheated areas or outside the building should be insulated Water Piping Installing contractor m...

Page 57: ...rainer with a minimum of 20 Mesh ahead of the condenser inlet to prevent condenser fouling and internal tube damage Mineral content of the condenser water must be controlled All makeup water has miner...

Page 58: ...type cement should be used to join the drain pipe connections Drainage of condensate directly onto the roof may be acceptable in certain areas refer to local codes If condensate is to drain directly...

Page 59: ...1 3 8 016 018 020 025 030 1 5 8 026 031 040 050 060 070 2 1 8 standard 1 3 8 preheat coil 055 065 075 090 105 120 130 140 2 1 8 Chilled Water Coil Four or six row chilled water cooling coils can be f...

Page 60: ...crolling through the following displays 1 LAT Measured leaving air temperature LAT average of LAT A and B probes MOD Modulation rate currently being applied to stage one SCR 2 WKGset Working LAT setpo...

Page 61: ...s 0 indicates normal operation 1 6 corresponds to stages 1 6 being forced on Stage 1 the SCR is forced to 50 System Setting Screens These screens are access by pressing the up button and then entering...

Page 62: ...N 60 kW P 70 kW 4 Q 80 kW R 90 kW 5 S 100 kW T 110 kW 6 U 120 kW 4 LATset Leaving air temperature setpoint Range 35 F 80 F and the default is 50 F 5 OATset Outside air temperature setpoint Range 35 F...

Page 63: ...ort 3 OAT sensor open short 4 Leaving air temp over limit 5 Cooling down after hi limit event 6 LAT below low limit 7 Stage 1 only recovery after mechanical limit 8 Shutdown after too many hi limit ev...

Page 64: ...rs and preheat discharge supply air temperature sensors are factory installed and wired to the preheat controller Electric preheat has maximum operating outside air temperature of 60 F and a maximum p...

Page 65: ...rotates at approximately 30 RPM If the wheel does not rotate when power is applied it may be necessary to readjust the diameter air seals Air Seal Adjustments Pile type air seals across both sides of...

Page 66: ...are All cassettes should be lifted by the bearing support beam Holes are provided on both sides of the bearing support beams to facilitate rigging as shown in the following illustration Lifting Hole L...

Page 67: ...ss surface of segment to separate polymer strips for better cleaning action Rinse dirty solution from segment and remove excess water before reinstalling in wheel Air Seals Four adjustable diameter se...

Page 68: ...nch dimension C racking must be corrected to ensure that drive belt will not disengage from wheel Operation Startup Procedure 1 By hand turn wheel clockwise as viewed from the pulley side to verify wh...

Page 69: ...e for segment removal 1 Unlock two segment retainers one on each side of the selected segment opening 2 With the embedded stiffener facing the motor side insert the nose of the segment between the hub...

Page 70: ...ate 2 Using hexagonal wrench loosen set screw in bearing locking collar Using light hammer and drift in drift pin hole tap collar in the direction of wheel rotation to unlock collar Remove collar 3 Us...

Page 71: ...71 12 Apply power to wheel and ensure that the wheel rotates freely without interference Belt Replacement...

Page 72: ...rogram in AAON ECat to determine the new band size for the required cfm and static pressure The following photos of a wheel are provided for practical guidelines only in order to identify the air band...

Page 73: ...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 Mark the location of any balancing weight Balancing weigh...

Page 74: ...o the shaft and typically contains either setscrews or a center tapered hole where the bushing inserts Location A is with the bushing mount on air inlet side of the fan Location B is with the bushing...

Page 75: ...heir previous locations Tighten bolts in a cross pattern to 5 6 ft lbs of torque Power Return and Exhaust Axial Flow Fans 26 and 31 140 tons Blade Pitch Angle Setting Instructions Step 1 Determine the...

Page 76: ...ce the key in the shaft make sure the screw on the bushing is aligned over the key and then tighten the screw to 9 ft lbs torque Filters Do not operate the unit without filters in place Unit should be...

Page 77: ...Sub Cooling Read the gauge pressure at the liquid line close to the point where the temperature was taken You must use liquid line pressure as it will vary from discharge pressure due to condenser coi...

Page 78: ...erheat Temperatures Correct an overcharged system by reducing the amount of refrigerant in the system to lower the sub cooling The system is undercharged if the superheat is too high and the sub cooli...

Page 79: ...0 611 9 381 7 31 98 8 56 2 61 172 5 103 5 91 277 6 171 0 121 422 5 263 5 32 100 9 57 5 62 175 4 105 4 92 281 7 173 7 122 428 2 267 1 33 102 9 58 8 63 178 4 107 3 93 285 9 176 4 123 433 9 270 7 34 105...

Page 80: ...80 Gas Heater Instructions Figure 43 Gas Heater Instructions...

Page 81: ...ormation http www orioncontrols com With JENEsys Unit Controls the controller modulates the ECM to maintain head pressure Note High voltage wires out of the motor Black Brown 1 Phase Line Voltage Gree...

Page 82: ...re setpoint is 340 psi for standard air cooled systems and 400 psi for modulating hot gas reheat air cooled systems With WattMaster Unit Controls the WattMaster Condenser Head Pressure Module is used...

Page 83: ...the heating season Night and Weekend Unoccupied Operation Packaged DX Cooling Operation and Control When a call for cooling G and Y1 Y2 etc is made the supply blower motors and compressors will energ...

Page 84: ...move power from all contactors Steam or Hot Water Preheating and Heating Operation Valve control for steam and hot water heating coils are by others Heating is accomplished by passing steam or hot wat...

Page 85: ...extensions are used they must meet category III requirements This appliance contains a wire screen at the vent outlet Each heating season prior to placing the appliance in heat mode maintenance check...

Page 86: ...n the heat exchanger If flexible gas piping in the unit must be replaced connectors cannot be reused only new connectors must be used Connect wiring per the wiring diagram on the controls compartment...

Page 87: ...ntrol panel Attach the orifice to the condenser assembly using all of the points where screws were removed Reconnect the fan motor wires Attach the fan grill at all of the points where screws were rem...

Page 88: ...ss side coil blank off panels upstream of the coil Reinstall economizer damper assembly if necessary Connect the suction and liquid copper connections to the evaporator coil Reinstall the TXV bulbs on...

Page 89: ...is less than 130 F and pressure is than 900 psig to avoid damaging the fin edges An elevated water temperature not to exceed 130 F will reduce surface tension increasing the ability to remove chlorid...

Page 90: ...tted After the substrate has been thoroughly wetted the salts will be soluble and is now only necessary to rinse them off Rinse It is highly recommended that a hose be used as a pressure washer will d...

Page 91: ...an opening Remove the brace located at the fan opening Remove the six bolts that connect the motor mount to the blower frame Two bolts are on the angle on the back of the motor mount box two are on th...

Page 92: ...s 10 Adjust the bottom knob labeled RESTART DELAY For automatic restart after recovery of voltage select from 2 seconds up to 5 minutes After recovery of line voltage this is how long the monitor will...

Page 93: ...ssor Controller Units with variable capacity scroll compressors may include the following compressor controller The following is an explanation of the terminals and troubleshooting alert flash codes o...

Page 94: ...12 sec 3 sec 80 5 00 100 0 15 sec 0 sec 100 Figure 51 Compressor Controller Flash Code Details Filter Replacement Monthly air filter inspection is required to maintain optimum unit efficiency It is st...

Page 95: ...ide Air C 2 49 x 20 x 5 16 Lint Screen with RAB Feature A2 Q R 3 47 x 12 x 5 16 Table 32 16 25 and 30 ton Pre Filters Feature 6A Quantity Size Type 0 No Pre Filters A 6 20 x 25 x 2 Pleated 30 Eff MERV...

Page 96: ...H No Pre Filters A A B C F G H 15 20 x 24 x 2 5 16 x 20 x 2 Pleated 30 Eff MERV 8 B A B C F G H 56 20 x 20 x 1 Metal Mesh Outside Air C A C 8 40 x 18 8 20 x 18 Lint Screen C B F G H 1 60 x 16 3 60 x...

Page 97: ...Filter Frame Replaceable Media with RAB Feature A2 Q R 2 20 x 20 x 2 and 1 12 x 24 x 2 F 4 16 x 20 x 4 Pleated 65 Eff MERV 11 G Pleated 85 Eff MERV 13 H Pleated 95 Eff MERV 14 Table 39 9 and 11 ton U...

Page 98: ...2 x 24 x 2 F 4 20 x 25 x 4 Pleated 65 Eff MERV 11 G Pleated 85 Eff MERV 13 H Pleated 95 Eff MERV 14 Table 41 16 25 and 30 ton Unit Filters Feature 6B Quantity Size Type 0 6 20 x 25 x 2 Pleated 30 Eff...

Page 99: ...24 x 4 Pleated 95 Eff MERV 14 with RAB Feature A2 Q R 16 12 x 24 x 4 Table 43 50 60 and 70 ton Unit Filters Feature 6B Quantity Size Type 0 24 12 x 24 x 2 Pleated 30 Eff MERV 8 B 24 12 x 24 x 4 Pleate...

Page 100: ...1 25 x 16 x 4 Pleated 30 Eff MERV 8 With Energy Recovery Wheel Exhaust Air Filters Feature 6A D F G OA 1 25 x 16 x 2 EA 1 25 x 16 x 2 Table 47 9 and 11 15 ton Energy Recovery Wheel Filters Feature 1A...

Page 101: ...Feature 1A Quantity Size Type F G H J Q R S T 10 24 x 24 x 2 Pleated 30 Eff MERV 8 With Energy Recovery Wheel Exhaust Air Filters Feature 6A D G OA 10 24 x 24 x 2 EA 14 25 x 16 x 2 U V W Y Z 1 2 3 10...

Page 102: ...ream side of the cooling coil Replacement Parts Parts for AAON equipment may be obtained from AAON at www aaonparts com When ordering parts reference the unit serial number and part number AAON Warran...

Page 103: ...orrosion problems may occur especially when more factors are valued 0 Use is not recommended Water Containing Concentration mg l or ppm Time Limits Analyze Before AISI 316 SMO 254 Copper Alloy Nickel...

Page 104: ...it 0 2 0 Manganese Mn 0 1 No Limit 0 1 0 Chloride Content Chloride Content Maximum Temperature 60 C 140 F 80 C 176 F 120 C 248 F 130 C 266 F 10 ppm SS 304 SS 304 SS 304 SS 316 25 ppm SS 304 SS 304 SS...

Page 105: ...107 44 25 77 86 00 30 86 69 28 35 95 56 16 40 104 45 81 45 113 37 58 50 122 30 99 55 131 25 68 60 140 21 40 65 149 17 91 Deg C Deg F Resistance kOhms 70 158 15 07 75 167 12 73 80 176 10 79 85 185 9 2...

Page 106: ...vel Yes No 3 Are the unit clearances adequate for service and operation Yes No 4 Do all access doors open freely and are the handles operational Yes No 5 Have all electrical connections been tested fo...

Page 107: ...nomizer Changeover Type and Operations Damper Wiring Check Gears Check Ambient Temperature Ambient Dry Bulb Temperature ________ F Ambient Wet Bulb Temperature ________ F Unit Configuration Water Cool...

Page 108: ...d N A Refrigeration System 4 Cooling Mode Pressure Saturated Temperature Line Temperature Sub cooling Superheat Discharge N A N A Suction N A Liquid N A Refrigeration System 1 Heating Mode Heat Pump o...

Page 109: ...ed with fluid Yes No 3 Has air been bled from the heat exchangers and piping Yes No 4 Is the glycol the proper type and concentration N A if water Yes No 5 Is there a minimum load of 50 of the design...

Page 110: ...th 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...

Page 111: ...R79510 June 2009 Update of the IOM making corrections to some of the values in the tables of Appendix A and adding e coated coil cleaning instructions August 2009 Update of the IOM correcting the Gas...

Page 112: ...VFD controlled and ECM driven condenser fan information November 2012 Update of the IOM adding information about compressor cycling June 2013 Added options to the feature string added curb gasket inf...

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Page 116: ...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 pro...

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