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AAON RN Series Installation Operation & Maintenance Download Page 71

 

71 

Packaged Direct Expansion (DX) Units 

 

 
All  DX  refrigeration  systems  are  factory 
assembled, 

leak  tested,  charged  with 

refrigerant,  and run tested. 
 
All 

refrigerant 

systems 

include 

an 

evaporator,  condenser,  liquid 

line  filter 

driers, 

expansion 

valves 

and 

scroll 

compressors.  

 

 
Never cut off  the  main  power  supply  to  the 
unit,  except  for  servicing,  emergency,  or 
complete  shutdown  of the unit.  When  power 
is  cut  off  from  the  unit  crankcase  heaters 
cannot prevent  refrigerant migration  into  the 
compressors. This means the compressor will 

cool  down  and  liquid 

refrigerant  may 

accumulate 

in 

the 

compressor. 

The 

compressor  is  designed  to  pump  refrigerant 
gas  and  damage  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  until  the  main 
power switch has been turned  on again  for at 
least  24  hours  for  units  with  compressor 
crankcase  heaters.  This  will 

give  the 

crankcase  heater  time  to  clear  any  liquid 
accumulation  out of the compressor before it 
is started.  
 
Always control  the unit  from the thermostat, 
or  control  panel,  never  at  the  main  power 
supply,  except  for  servicing,  emergency  or 
complete  shutdown  of the unit. 
 
During  the  cooling  season, if  the  air  flow  is 
reduced  due  to  dirty  air  filters  or  any  other 
reason,  the  cooling  coils  can  get  too  cold 
which will  cause excessive liquid  to return to 
the  compressor.  As the  liquid  concentration 
builds  up,  oil  is  washed  out  of  the 
compressor, leaving  it starved for lubrication.  
 
The compressor life will  be seriously  shorted 
by  reduced  lubrication  and  the  pumping  of 
excessive  amounts  of  liquid 

oil 

and 

refrigerant. 
 

Note: 

Low Ambient  Operation 

Air-cooled  DX  units  without  a low  ambient 
option,  such as condenser  fan cycling  or  the 
0°F  low  ambient  option,  will  not  operate in 
the cooling  mode of operation  properly  when 
the outdoor  temperature is below  55°F.  Low 
ambient  and/or  economizer  options  are 
recommended  if  cooling  operation  below 
55°F is expected. 
 

 
 

 

COMPRESSOR CYCLING 

 

3 MINUTE  MINIMUM  OFF TIME 

To 

prevent 

motor 

overheating 

compressors  must  cycle  off  for  a 
minimum of 3 minutes. 
 

5 MINUTE  MINIMUM  ON TIME 

To  maintain  the  proper  oil  level 
compressors  must  cycle  on  for  a 
minimum of 5 minutes. 
 
The  cycle  rate  must  not  exceed  7 
starts per hour. 

 

    

 

WARNING

 

 
 

 

CRANKCASE  HEATER 

OPERATION 

 

Some  units  are  equipped 

with 

compressor crankcase heaters, which 
must  be  energized  at  least  24  hours 
prior to cooling operation,  to clear any 
liquid 

refrigerant 

from 

the 

compressors. 

 

  

 

CAUTION 

 

Summary of Contents for RN Series

Page 1: ...lier 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 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 installat...

Page 2: ......

Page 3: ...w Through Coils 49 Startup 50 Filters 50 Supply Fans 50 Power Return Axial Flow Fans 16 25 and 30 tons 52 Power Return and Exhaust Axial Flow Fans 26 and 31 140 tons 54 Adjusting Refrigerant Charge 55 Checking Liquid Sub Cooling 56 Checking Evaporator Superheat 56 Adjusting Sub cooling and Superheat Temperatures 57 Freeze Stat Startup 57 Condenser Fan Electronically Commutated Motor ECM Startup 59...

Page 4: ...e Heat Exchanger 77 Water Piping 78 Energy Recovery Units 80 Aluminum Energy Recovery Wheel 81 Polymer Energy Recovery Wheel 83 Energy Recovery Wheel General Cleaning 90 Energy Recovery Wheel Defrost Timer Setting 92 Gas or Electric Heating 92 Electric Preheat 94 Status Display Screens 94 System Setting Screens 95 LED Flash Alarm Codes 96 Operation 97 Gas Heating 97 Piping Sizing Examples 99 Inlet...

Page 5: ...r Coil Refrigeration Circuit Values 56 Table 16 Acceptable Water Cooled Refrigeration Circuit Values 56 Table 17 Acceptable Microchannel Air Cooled Condenser Coil Liquid Sub Cooling Values 57 Table 18 R 410A and R 22 Refrigerant Temperature Pressure Chart 58 Table 19 ECM Condenser Fan Cycling Options 59 Table 20 Steam Coil Connection Sizes 70 Table 21 Hot Water Coil Connection Sizes 70 Table 22 Ch...

Page 6: ... 2 RN Series A B and C Cabinet 30 Figure 3 RN Series D Cabinet 30 Figure 4 RN Series E Cabinet 30 Figure 5 RN Series 6 8 and 10 ton Unit Isolator Locations 32 Figure 6 RN Series 9 and 11 15 ton Unit Isolator Locations 33 Figure 7 RN Series 16 25 and 30 ton Unit Isolator Locations 34 Figure 8 RN Series 26 31 50 60 and 70 ton Unit Isolator Locations 35 Figure 9 Steel Mounting 36 Figure 10 Forkliftin...

Page 7: ...Supply Fan 64 Figure 42 Bolts which Connect Motor Mount to Blower Fan 64 Figure 43 Variable Capacity Compressor Controller 72 Figure 44 Compressor Controller Flash Code Details 73 Figure 45 Evaporator Coil Access 74 Figure 46 Removal of a Condenser Fan Assembly 75 Figure 47 RPE 48 BD filter element 75 Figure 48 Aluminum Energy Recovery Wheel 81 Figure 49 Aluminum ERW Purge Sector Location 81 Figur...

Page 8: ...n Air Bypass Modulating Hot Gas Reheat Safety Burglar Bars Freeze Stats Hot Water Steam Preheat Coils Electric Preheat Phase and Brown Out Protection Supply Return Smoke Detectors Safety Continued Supply Return Firestats Installation and Maintenance Clogged Filter Switch Color Coded Wiring Diagram Compressors in Isolated Compartment Compressor Isolation Valves Convenience Outlet Direct Drive Suppl...

Page 9: ...erty damage Improper servicing could result 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 all wires prior to disconnecting Reconnect wires correctly Verify proper operation after servicing Secure all doors with key lock or nut and bolt WARNING WHAT...

Page 10: ...oducts into the building Check that furnance vent and air intake terminal s are not obstructed in any way during all seasons WARNING During installation testing servicing and troubleshooting of the equipment it may be necessary to work with live electrical components Only a qualified licensed electrician or individual properly trained in handling live electrical components shall perform these task...

Page 11: ...electric motor s FLA rating as shown on the motor nameplate CAUTION UNIT HANDLING To prevent injury or death lifting equipment capacity shall exceed unit weight by an adequate safety factor Always test lift unit not more than 24 inches high to verify proper center of gravity lift point to avoid unit damage injury or death WARNING Failure to properly drain and vent coils when not in use during free...

Page 12: ...a pH value greater than 8 5 after mixing without first using an aluminum corrosion inhibitor in the cleaning solution CAUTION Some chemical coil cleaning compounds are caustic or toxic Use these substances only in accordance with the manufacturer s usage instructions Failure to follow instructions may result in equipment damage injury or death WARNING Do not clean DX refrigerant coils with hot wat...

Page 13: ...anger Care must be taken to avoid allowing chemicals to enter the refrigerant to water heat exchanger See Appendix A Heat Exchanger Corrosion Resistance for more information CAUTION OPEN LOOP APPLICATIONS Failure of the condenser as a result of chemical corrosion is excluded from coverage under AAON Inc warranties and the heat exchanger manufacturer s warranties WARNING WATER FREEZING Failure of t...

Page 14: ... the construction 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 specifications Always refer to the unit nameplate for specific ratings unique to the model you have purchased 9 READ THE ENTIRE INSTALLATION OPERATION AND MAINTENANCE MANUAL OTHER IMPORTANT SAFETY PREC...

Page 15: ...z 9 208V 1Φ 60Hz INTERIOR PROTECTION 0 Standard Vertical Discharge and Return A InteriorCorrosion Protection Vertical Discharge andReturn Model Option A COOLING HEAT PUMP A1 REFRIGERANT STYLE 0 AirHandling Unit B R 410A High Efficiency C R 410A Standard Efficiency E R 410A Variable Capacity ScrollCompressor High Efficiency F R 410A Variable Capacity ScrollCompressor Standard Efficiency G R 410A Tw...

Page 16: ...mp Lead VCC 1 Stage Aux Heat F Modulating HeatPump All VCC 1 Stage Aux Heat H Single Serpentine 8fpi J Half Serpentine 8fpi K Single Serpentine 10fpi L Half Serpentine 10fpi M Single Serpentine 12fpi N Half Serpentine12fpi P 1 Stage Heat Pump 2 Stage Auxiliary Heat Q 2 Stage Heat Pump 2 Stage Auxiliary Heat R 4 Stage Heat Pump 2 Stage Auxiliary Heat S Modulating HeatPump Lead VCC 2 Stage Aux Heat ...

Page 17: ...10fpi M Single Serpentine 12fpi N Half Serpentine12fpi Feature 1 RETURN OUTSIDE AIR 1A RETURN OUTSIDE AIR SECTION 0 Manually Adjustable OA Opening RA Opening A Economizer B Econ PowerExhaust C Econ PowerReturn D Econ PE Discharge DamperVolume Control E Econ PE Discharge DamperVolume Control 0 10V External Control F Low cfm TotalEnergy Recovery Wheel G Low cfm TotalERW Bypass H Low cfm Sensible ERW...

Page 18: ...Option F Shaft Grounding Q Option G Shaft Grounding R Option K Shaft Grounding S Option L Shaft Grounding T Option M Shaft Grounding 1C RETURN EXHAUST AIR BLOWER 0 Standard None A 12 x9 x 2 Forward Curved B 15 Backward Curved Plenum C 18 5 Backward 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 Wid...

Page 19: ...rride Q Fully Mod Act Enthalpy CO2Override R DDC Actuator CO2 Override S Dual MinimumPosition Potentiometers Fully Mod Act Sensible Limit T DualMinimumPosition Potentiometers Fully Mod Act Enthalpy Limit U 2 Position Actuator Y Fault Detection andDiagnosticsController FDD Sensible Limit Z FDD Enthalpy Limit 1 FDD Sensible Limit CO2 Override 2 FDD Enthalpy Limit CO2 Override Feature 3 HEAT OPTIONS ...

Page 20: ...emium Efficiency TEFC Motor 1 VFD L 2 Blowers Premium Efficiency TEFC Motors 2 Motors on1VFD M 2 Blowers Premium Efficiency TEFC Motors 2 Motorson2VFDs N Option D Shaft Grounding P Option F Shaft Grounding Q Option G Shaft Grounding R Option K Shaft Grounding S Option L Shaft Grounding T Option M Shaft Grounding 5B SUPPLY AIR BLOWER B 15 Backward Curved Plenum C 18 5 Backward Curved Plenum D 24 Ba...

Page 21: ...rd None A 2 Pleated MERV 8 B MetalMesh Outside AirFilter C Lint Screen Filter D Exhaust Air ERW Filter E Options A B F Options A D G Options B D H Options A B D 6B UNIT FILTER 0 2 Pleated MERV 8 B 4 Pleated MERV 8 C 2 Permanent Filter Replaceable Media F 4 Pleated MERV 11 G 4 Pleated MERV 13 H 4 Pleated MERV 14 6C FILTER OPTIONS 0 Standard A Clogged FilterSwitch B Magnehelic Gauge C OptionsA B Fea...

Page 22: ... Parallel Modulating Hot Gas Reheat MicrochannelCoil Lag Circuit U Options A T V Options B T W Polymer E Coated ParallelModulating Hot Gas Reheat MicrochannelCoil Lag Circuit Y Options A W Z Options B W 1 All Circuit Parallel ModulatingHot Gas Reheat MicrochannelCoil 2 OptionsA 1 3 OptionsB 1 4 PolymerE Coated AllCircuit Parallel ModulatingHot Gas Reheat MicrochannelCoil 5 OptionsA 4 6 OptionsB 4 ...

Page 23: ... R 70 Amp Circuit Breaker S 80 Amp Circuit Breaker T 90 Amp Circuit Breaker U 100 Amp Circuit Breaker V 110 Amp Circuit Breaker W 125 Amp Circuit Breaker Y 150 Amp Circuit Breaker Z 175Amp Circuit Breaker 1 200 Amp Circuit Breaker 2 225 Amp Circuit Breaker 3 250 Amp Circuit Breaker 4 300 Amp Circuit Breaker 7 350 Amp Circuit Breaker 8 400 Amp Circuit Breaker 9 450 Amp Circuit Breaker Feature 11 SA...

Page 24: ...OptionsA B C E 5 OptionsA B D E 6 OptionsA C D E 7 OptionsB C D E 8 OptionsA B C D E Feature 13 SPECIAL CONTROLS 0 TerminalBlock for ThermostatControl D VAV Unit Controller VAV Cool CV Heat E Constant Volume Unit Controller CV Cool CV Heat F Makeup AirUnit Controller CV Cool CV Heat J Factory Installed DDCControlsFurnishedby Others K Factory Installed DDCControls Furnished by Others w Isolationrel...

Page 25: ...Half Serpentine 12fpi G 10 kW 7 5 kW 208V H 15 kW 11 3 kW 208V J 20 kW 15 kW 208V K 30 kW 22 5 kW 208V L 40 kW 30 kW 208V M 50 kW 37 6 kW 208V N 60 kW 45 1 kW 208V P 70 kW 52 6 kW 208V Q 80 kW 60 1 kW 208V R 90 kW 67 6 kW 208V S 100 kW 75 1 kW 208V T 110 kW 82 6 kW 208V U 120 kW 90 1 kW 208V Feature 15 GLYCOL PERCENTAGE 0 Standard WaterorNo WSHPwith Polymer Energy RecoveryWheel C Field Adjustable ...

Page 26: ...ndard A Export Crating B Export Crating No CondenserSection C ShrinkWrap D Options A C E Options B C Feature 21 WATER COOLED CONDENSER 0 Standard None A Balancing Valves B WaterFlowSwitch C Motorized Shut offValve D Head Pressure ControlValve E Options A B F Options A C G Options A D H Options B C J Options B D L Options A B C M Options A B D Feature 22 CONTROL VENDORS 0 None T VCB X Controls Syst...

Page 27: ...g Models a Certified as a commercial central air conditioner with or without electrically operated compressors b Certified for outdoor installation only c Certified for installation on a combustible roof with a minimum of 12 high curb d Certified with refrigerant R 410A coils or with chilled water cooling coils Codes and Ordinances RN Series units have been tested and certified by ETL in accordanc...

Page 28: ...ds repairs and freight claims 918 382 6450 Note Upon receipt check shipment for items that ship loose such as filters and remote sensors Consult order and shipment documentation to identify potential loose shipped items Loose shipped items may have been placed inside unit cabinet for security Installers and owners must secure all doors with locks or nuts and bolts to prevent unauthorized access Fi...

Page 29: ...A Cabinet Unit Clearances 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 clearance on the left side for service access DX and no cooling air handling units with an energy recovery wheel require 24 of clearance on the left side for service access Table 2 ...

Page 30: ...not have hydronic 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 5 E Cabinet Unit Clearances Location Unit Size 55 65 and 75 140 tons Front Controls Side 60 Back Outside Air 100 from end of the unit Left Side 72 Right Side 72 Top Unobstructed Figure 4 RN Series E Cabinet 55 65 and 75 140 tons Setting the Curb ...

Page 31: ...ough a combustible roof a clearance of 1 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 structure and roof and all joints must be sealed with mastic roofing to ensure a watertight seal CAUTION Neoprene isolator for unit vibration isolation is provid...

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

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

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

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

Page 36: ...36 Figure 9 Steel Mounting ...

Page 37: ...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 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 Spreader bars are required for 55 65 and 75 140 ton units Care must be taken to prevent damage to the cabinet coils and condenser fans It is recommended to lift the...

Page 38: ...t with utility and duct openings 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 on the curb and is level Figure 11 Lifting Details of a 6 25 and 30 ton Standard or Power Exhaust Unit Figure 12 Lifting Details of a 6 25 and 30 ton Energy Recovery Wh...

Page 39: ...39 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: ...st 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 15 Duct Connection Do not drill or punch holes in the base of the unit from inside the unit or from below the unit to attach ductwork Leaking may occur if unit base is punctured CAUTION ...

Page 41: ...ed 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 must approve field provided building anchorage to unit or curb in compliance with OSP 0180 10 Use provided self tapping screwsto attach base of unit to seismic curb bracket Figure 16 Solid Bottom Seism...

Page 42: ... 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: ...od Attach the side pieces to the top of the hood using the provided screws and attached the side pieces to the end of the unit through the flange Apply silicon caulking along the top and both sides of the rain hood Take care to seal the top corners where the rain hood attaches to the unit Figure 21 6 25 and 30 ton Closed Rain Hood Figure 22 6 25 and 30 ton Open Rain Hood 26 and 31 140 ton Units Re...

Page 44: ...ished seal at the base The flashings are unit specific and designed to cover the slot at each end of the unit to prevent water run off into the curb Failure to attach and seal the end of unit with the flashings may result in water leakage into the curb Figure 24 Factory Supplied End Flashings Metal Mesh Filters 6 25 and 30 ton Units Metal mesh outside air filters require installation of the filter...

Page 45: ... control wiring separately through the utility entry in the base of the unit Do not run power and signal wires in the same conduit Route power and control wiring separately through the utility entry in the base of the unit Do not run power and control signal wires in the same conduit The utility entry on 9 25 and 30 ton units is located in the unit base in the front right hand corner of the unit c...

Page 46: ... 75 140 ton Units Note All units are factory wired for 208V 230V 380V 460V or 575V The transformer configuration must be checked by a qualified technician prior to service especially if unit is to be connected to a 208V or 230V supply For 208V service interchange the yellow and red conductor on the low voltage control transformer Red Black for 208V Yellow Black for 230V Wire power leads to the uni...

Page 47: ...65 and 75 140 ton units Variable speed compressors must not be operated outside the factory determined turndown ratio or frequency range The factory determined compressor VFD ranges are given in the following tables Table 7 RN A through C Cabinet Variable Speed Compressor Turndown Ratio Model RN Compressor Turndown Ratio 007 17 008 15 009 10 010 20 011 10 013 10 015 12 016 20 020 12 025 15 030 15 ...

Page 48: ...AWG 350 ft 16 AWG 500 ft 14 AWG 750 ft 12 AWG 1250 ft Total Wire Distance Allowable Quantity of Control Wires x Control Wire Distance Take the total wire distance allowable and divide by the quantity of wires to be connected This indicates the distance allowable for that size wire The wiring to the unit must not exceed the total wire distance allowable If the voltage at the connectors is less than...

Page 49: ... back up due to air being pulled up through the condensate drain piping Condensate drain trapping and piping must conform to all applicable governing codes Draw Through Coils Figure 29 Draw Through Drain Trap The X dimension on the draw through trap must be at least equal to the absolute value of the negative static pressure in the drain pan plus one inch To calculate the static pressure at the dr...

Page 50: ...result in a clogged evaporator coil Supply Fans RN Series units are equipped with direct drive backward curved plenum fan assemblies that are selected to deliver the air volume specified according to unit size and job requirements This is either done with air volume bands in the blower wheels or with variable frequency drives Field airflow adjustment may be required at startup Air volume bands for...

Page 51: ...y in order to identify the air band location in the wheel Actual field installation of the air band into the wheel will require accessinto and through the blower wheel venture which may require removal of the blower motor and wheel Air volume bands are made of aluminum sized and equipped with easy bend tabs that are to be inserted into pre punched slots provided on the wheel Once the band has been...

Page 52: ...um Fan Set Screw Specifications SET SCREW DIAMETER TORQUE IN LBS 1 4 80 5 16 126 3 8 240 The gap tolerances that are allowed between the blower and the inlet cone for the plenum fan blowers are shown in Figure 31 The inlet cone can be moved as necessary to center the cone in relation to the blower The blower can be moved on the motor shaft to set the correct overlap These tolerances are critical t...

Page 53: ...nd Left L is counterclockwise when facing the discharge side of the fan Step 4 Determine the bushing mount location The bushing mount is the centersection of the hub through which the fan is mounted to 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 54: ...their 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 new required pitch for the fan blades 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 Mark the ...

Page 55: ...usting the charge of a system in the field must be based on determination of liquid sub cooling and evaporator superheat On a system with an expansion valve liquid sub cooling is more representative of the charge than evaporator superheat but both measurements must be taken Before Charging Unit being charged must be at or near full load conditions before adjusting the charge Units equipped with ho...

Page 56: ...ture pressure chart Subtract the measured liquid line temperature from the saturated temperature to determine the liquid sub cooling Compare calculated sub cooling to the tables below for the appropriate coil and system type and options Checking Evaporator Superheat Measure the temperature of the suction line close to the compressor Read gauge pressure at the suction line close to the compressor C...

Page 57: ...if the sub cooling temperature is too high and the evaporator is fully loaded low loads on the evaporator result in increased sub cooling and the evaporator superheat is within the temperature range as shown in the table above high superheat results in increased sub cooling Correct an overcharged system by reducing the amount of refrigerant in the system to lower the sub cooling The system is unde...

Page 58: ...50 611 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 0 60 2 64 181 5 109 3 94 290 1 179 1 124 439 6 274 3 35 107 1 61 5 65 184 5 111 2 95 294 4 181 8 125 445 4 278 0 36 109 2 62 9 66 187 6 113 2 96 298 7 184 6 126 451 3 281 7 37 111 4 64 3 67 190 7 115...

Page 59: ...ion 4 Option 5 Black 0 50 BWS L1 208 230 VAC 208 230 VAC 208 230 VAC 208 230 VAC 208 230 VAC Brown 0 50 BWS L2 208 230 VAC 208 230 VAC 208 230 VAC 208 230 VAC 208 230 VAC Green 10 EYELET Ground GND GND GND GND GND Blue 0 50 BWS Common Common 24 VAC 24 VAC 24 VAC 24 VAC Yellow 0 50 BWS Signal PWM 24 VAC 24 VAC White 0 50 BWS Signal 24 VAC 24 VAC Orange 0 50 BWS Signal 24 VAC 24 VAC RPM 300 1100 300...

Page 60: ...ewdriver Recommended Settings The switch will come factory set to cut in at 425psi 5psi and a differential of 155psi or open at 270psi 5psi Settings for CUT IN and DIFFERENTIAL PRESSURE are indicated with two slider gauges Each adjustment screw sits above the setting that it controls Cut In Differential ...

Page 61: ...se the pressure set point for the DIFFERENTIAL Gauge turn the adjustable screw clockwise To lower the pressure set point for the DIFFERENTIAL Gauge turn the adjustable screw counter clockwise NOTE The pressure values on the gauge must be verified with gauges on the refrigerant line The gauge scale is for illustration purposes only Cut In Gauge Cut In Gauge Differential Gauge Differential Gauge ...

Page 62: ...ion and Control When a call for cooling G and Y1 Y2 etc is made the supply blower motors and compressors will energize Note When using field controls any variable capacity compressors must run at 100 for 1 minute when starting Gas Heater Operation When heat G and W1 W2 etc is called for the combustion motor starts and the ignition control is energized The control sends 24 VAC to the main gas valve...

Page 63: ...g Operation Controls for chilled water cooling coils and non compressorized DX coil are by others Maintenance See back of the manual for maintenance log At least once each year a trained qualified service technician must check out the unit Fans evaporator coils and filters must be inspected at least monthly Supply Fans Lubrication All original fan motors and bearings are furnished with factory lub...

Page 64: ... front of the motor mount box Figure 41 9 25 and 30 ton Supply Fan Figure 42 Bolts which Connect Motor Mount to Blower Fan Slide the motor mount back away from the air inlet so that the blower wheel is clear of the inlet A screw driver or crowbar can be used to help accomplish this Use the pry slots on the back side of the motor mount Pull the motor mount to the edge of the blower frame at the ope...

Page 65: ...s and overflow of the pan itself Cleaning of the drain pans and inside of the unit must be done only by qualified service technician Brazed Plate Heat Exchanger Cleaning Because of a normally high degree of turbulence in brazed plate heat exchangers for many applications the heat exchanger channels are self cleaning For applications that are not self cleaning i e hard water at high temperatures et...

Page 66: ...pressure is less than 100 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 chlorides and dirt Quarterly cleaning is essential to extend the life of an e coated coil and is required to maintain coating warranty coverage Coil cleaning shall be part of the unit s regularly scheduled maintenance procedur...

Page 67: ...d by use of a pump up sprayer or conventional spray gun Apply the cleaner to unit interior air exiting side coil surfaces first Work in sections panels moving side to side and from top to bottom Allow the cleaning solution to soak for 5 to 10 minutes Then move on to the exterior using the same method Rinse Using pressurized potable water such as a garden hose 100 psi rinse the coils and continue t...

Page 68: ...w the coil to soak for 10 15 minutes 4 Rinse the coil with water as in step one 5 Repeat as necessary 2 Water Flush This procedure can be used when the only material to cause the coil to need cleaning is debris from plant material that has impinged the coil face 1 Rinse the coil completely with water Use a hard spray but be careful not to bend or damage the fins A spray that is too hard will bend ...

Page 69: ...ing is recommended Commercial roofing material manufacturers using PVC and EPDM have been contacted and indicate that there should be no problem with any of the procedures outlined above Options See back of the manual for maintenance log Heating Coils One or two row hot water and steam heating and preheating coils can be factory installed All valve controls for heating operation are field supplied...

Page 70: ...ooling operation are field supplied and field installed Chilled water coil connections are spun copper tube Table 22 Chilled Water Coil Connection Sizes Model RN Chilled Water Coil Connection Size Coil Connection Quantity 006 007 008 009 010 011 013 015 1 5 8 1 1 016 018 020 025 030 2 1 8 1 1 026 031 040 2 5 8 1 1 050 055 060 065 070 2 1 8 2 2 075 090 105 120 130 140 2 1 8 4 4 In Out Connections M...

Page 71: ...er supply except for servicing emergency or complete shutdown of the unit During the cooling season if the air flow is reduced due to dirty air filters or any other reason the cooling coils can get too cold which will cause excessive liquid to return to the compressor As the liquid concentration builds up oil is washed out of the compressor leaving it starved for lubrication The compressor life wi...

Page 72: ...nute when starting Figure 43 Variable Capacity Compressor Controller Low Voltage Terminals 24COM Module Common 24VAC Module Power C1 C2 Demand Input P1 Pressure Common P2 Pressure Input P3 Pressure Power 5VDC P4 Pressure Shield P5 P6 Pressure Output T1 T2 Discharge Temperature Sensor High Voltage Terminals A1 A2 Alarm Relay Out M1 M2 Contractor L1 Control Voltage N L2 Control Voltage L U1 U2 Digit...

Page 73: ...een thermistor temperature readings and resistance values Table 23 Demand Signal vs Compressor Capacity Modulation Demand Signal VDC Loaded Unloaded Time Loaded Time Unloaded Compressor Capacity 1 00 Off Off Off Off 0 1 44 10 90 1 5 sec 13 5 sec 10 3 00 50 50 7 5 sec 7 5 sec 50 4 20 80 20 12 sec 3 sec 80 5 00 100 0 15 sec 0 sec 100 Figure 44 Compressor Controller Flash Code Details ...

Page 74: ...1 4 gap between the upstream side of the coil and the back of the drain pan Secure the coil to the back wall of the unit with the blank off panel Attach the top and access side blank off panels to the coil Attach the filter rack to the back top and access side coil blank off panels upstream of the coil Reinstall economizer damper assembly if necessary Connect the suction and liquid copper connecti...

Page 75: ...enser 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 removed Suction Filter 55 65 and 75 140 ton In an effort to help protect the compressors from contaminants during testing and startup AAON is now factory installing pleated replaceable core suction line filters on the RNE Series products 55 65 a...

Page 76: ...at Pump Applications Water source heat pump units using 100 outside air must have electric preheat if the application has a potential for operation with air entering the indoor coil below 43 F with a water 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 corros...

Page 77: ... Water is subject to freezing at 32 F When water freezes in a heat exchanger significant forces are exerted on the components of the heat exchanger where the water is confined Failure of the condenser due to freezing will allow waterto enter the refrigerant circuit and will cause extensive damage to the OPEN LOOP APPLICATIONS Coated brazed plated refrigerant to water heat exchangers are recommende...

Page 78: ...ovides a signal to the unit controller that water flow is present in the refrigerant to water heat exchanger and the unit can operate without damaging unit components Table 25 Standard Brazed Plate Heat Exchanger Water Connections Model RN Supply and Return Connection Size 006 007 1 NPT 008 010 009 011 013 015 016 018 020 1 1 2 NPT 025 030 2 NPT 026 031 040 2 1 2 Grooved Pipe 050 055 060 070 3 Gro...

Page 79: ...haracteristics Pressure and temperature ports are recommended in condenser water supply and return lines for system balancing These openings must be 5 to 10 pipe diameters from the unit water connections To allow for mixing and temperature stabilization wells in the water piping must extend at least pipe diameter into the pipe WATER PIPING Follow national and local codes when installing water pipi...

Page 80: ...t fan operation or air circulation as all systems have unique operations characteristics Professional air balance specialists must be employed to establish actual operating conditions and to configure the air delivery system for optimal performance Controls A variety of controls and electrical accessories may be provided with the equipment Identify the controls on each unit by consulting appropria...

Page 81: ... the purge sector is mounted in the correct location Purge sector must be located on the fresh supply air side Based on the airflow and the wheel rotation in the following illustrations notice the correct locations for the purge sector Figure 49 Aluminum ERW Purge Sector Location Aluminum Wheel Air Seals Both non contact sealing on wheel peripheries and brush sealing middle beam are maintenance fr...

Page 82: ...checked every year Pay attention to the distance of the sector against the recovery wheel matrix Use compressed air to clean if required Aluminum Wheel Drive Components Drive belt requires periodic inspections Due to material property belt may stretch therefore it may require user to increase the tension upon inspection Belt tension must be checked afterthe first 24 hours of operation and at least...

Page 83: ...it through the second hole this time use the pliers to drag the segment tongue easier and twist it back to the starting position 5 Your belt is now shortened and the tension of the belt is increased Polymer Energy Recovery Wheel This section is provided to assure the polymer energy recovery feature will be properly setup to perform in accordance with the job specifications for your particular appl...

Page 84: ...Set Purge Angle When installed the purge angle is factory set to 5 degrees If a different angle is required complete the following steps to adjust the purge 1 Loosen the three purge adjusting screws 2 Adjust purge sector to the specified angle 3 Tighten the purge adjusting screws 4 Turn the wheel by hand clockwise when viewed from pulley side to check for interference Polymer Wheel Check Purge Sea...

Page 85: ... support channels and slide the seals plates away from the wheel Using the paper feeler gauge readjust and retighten one seal plate at a time to provide slip fit clearance when the wheel is rotated by hand Confirm that the wheel rotates freely Apply power to the unit and confirm rotation Visually inspect the belt and ensure the belt is tracking near the center of the rim Verify the wheel speed is ...

Page 86: ...th hands and objects away from moving parts activate unit and confirm wheel rotation Wheel rotates clockwise as viewed from the pulley side 4 If wheel has difficulty starting turn power off and inspect for excessive interference between the wheel surface and each of the four 4 diameter seals To correct loosen diameter seal adjusting screws and back adjustable diameter seals away from surface of wh...

Page 87: ...ng the length of the spoke Retighten adjusting screws and recheck clearance with feeler gauge Polymer Wheel Drive Components The wheel drive motor bearings are pre lubricated and no further lubrication is necessary The wheel drive pulley is secured to the drive motor shaft by a combination of either a key or D slot and set screw The set screw is secured with removable locktite to prevent loosening...

Page 88: ...wheel and slide wheel frame out of cabinet 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 plates Segment Installation 3 Holding segment by the two outer corners press the segment towards the center of the wheel and inwards against the spoke flanges If hand pressure do...

Page 89: ...g to the bearing support beam Slide bearing from shaft If not removable by hand use bearing puller 4 Form a small loop of belt and pass it through the hole in the bearing support beam Grasp the belt at the wheel hub and pull the entire belt down Note Slight hand pressure against wheel rim will lift weight of wheel from inner race of bearing to assist bearing removal and installation 5 Loop the tra...

Page 90: ...on intensity Class 3 air has significant contaminant concentration and significant offensive odor or sensory irritation intensity Class 4 air has highly objectionable fumes or gases and potentially contains dangerous particles bio aerosols or gases at a concentration high enough to be considered harmful not suitable for recirculation or transfer to any other space Table 26 Energy Recovery Wheel Cl...

Page 91: ...ustrial applications involving the ventilation of machine shop areas for example annual washing of energy transfer may be necessary to maintain latent transfer efficiency Proper cleaning of the energy recovery wheel will restore latent effectiveness to near original performance Aluminum Wheel Cleaning See general energy recovering cleaning section for how often to clean To clean gain accessto the ...

Page 92: ...the defrost timer Recommended setting is 35 F Once the OA Temperature goes below the setpoint the wheel timer will stop for 2 minutes and run for 30 minutes and will continue to cycle at this rate as long as OA Temperature is below setpoint If more off time is required to defrost the wheel increase the T2 Knob time to a greater off time than 2 minutes Figure 52 Defrost Timer Figure 53 Temperature ...

Page 93: ... 27 Electric and Gas Heating Capacities Model Option B2 Gas Heat Electric Heat Input Capacity Output Capacity Capacity MBH MBH kW 208V kW 230V 380V 460V 575V 1 Heat 1 7 5 10 2 Heat 2 90 0 72 0 15 0 20 3 Heat 3 22 5 30 4 Heat 4 270 0 218 7 30 0 40 5 Heat 5 37 5 50 6 Heat 6 390 0 315 9 45 1 60 7 Heat 7 60 1 80 8 Heat 8 405 0 328 1 75 1 100 9 Heat 9 90 1 120 A Heat A 120 1 160 B Heat B 150 2 200 C He...

Page 94: ...ion rate currently being applied to stage one SCR 2 WKGset Working LAT setpoint F LATeet RESETset as adjusted by 0 10V RESET signal 3 LATset Leaving air temperature F control setpoint 4 RESETset Reset air temperature F control setpoint 5 OATset Outside air temperature F control setpoint measured outside temperature must be less to enable preheat 6 LLTset Low Limit Time temperature F setpoint If th...

Page 95: ...Enable call before heating starts This is to allow the Supply Fan to come up to speed Supply Fan VFD s have a 45 second ramp up time Range 1sec 60sec and the default is 15sec 2 BelowLLT Below Low Limit Time Range 10sec 1800sec and the default is 10sec If LLTset temperature is not reached within BelowLLT after reaching full output the status relay will operate 3 Stages Number of stages Range 1 6 an...

Page 96: ...s 0 The manual override may be used for unit testing of each stage Stage 1 will be at 50 to test SCR and stages 2 6 will be full capacity A manual override will expire in ten minutes if not manually cancelled by resetting ManSTG back to zero LED Flash Alarm Codes The flashing red LED will be to the right of the screen The number of blinks is described below The LCD screen will also display the scr...

Page 97: ...e started up and maintain the leaving air temperature setpoint with both SCR controlled and staged electric preheat Both setpoints are set with push button LCD interface on the preheat controller Outside air temperature sensors and preheat discharge supply air temperature sensors are factory installed and wired to the preheat controller Electric preheat has maximum operating outside air temperatur...

Page 98: ...pressure and manifold pressure the service technician shall time the gas flow rate through the gas meter with a stopwatch to verify the gas input rate Unit nameplate input rate value has been calculated at the altitude where the unit was shipped Above 2 000 ft the input rate is adjusted 4 for every 1 000 ft Figure 55 RN Series Gas Heat Exchanger Model Option B2 Input MBH Connections Quantity Size ...

Page 99: ...y companies may also require pipe sizes larger than the minimum sizes listed Piping Sizing Examples A 100 ft pipe run is needed for a 1080 MBH natural gas heater The natural gas has a rating of 1000 Btu ft3 and a specific gravity of 0 6 Obtain these values from the local gas supplier BTU ft MBH 1000 1080 3 1080 ft3 hr From the natural gas maximum capacities table at 100 ft and 1080 ft3 hr the requ...

Page 100: ...sually require a field provided and installed manual main shutoff valve and union external to the unit Main shutoff valve shall be labeled Install a drip leg near the unit connection to trap sediment and condensate Pipe joint compounds used on all gas piping connections shall be resistant to liquid petroleum gases If flexible gas piping to the unit or in the unit must be replaced connectors cannot...

Page 101: ... need to be managed and not just drained onto the roof depending on national and local code requirements and the application of the final user This condensate can stain the roof and it can cause rust in some caseson metal roofs It is the responsibility of the end user or contractor to determine if the condensate will damage the roofing material Below freezing ambient air temperatures during the he...

Page 102: ...102 Figure 56 Example 6 50 60 70 ton through the Base Gas Piping ...

Page 103: ...103 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: ... the initial factory firing and testing any of the gases will be under the acceptable level of concentration for human occupancy Do not use open flame or other source of ignition for leak testing Fire or explosion could result causing property damage personal injury or death DANGER Those sensitive to odors or gases from trace amounts of residual oils must NOT be present in the conditioned space du...

Page 105: ...105 Gas Heater Operating Instructions Figure 58 Gas Heater Instructions ...

Page 106: ...n the vent outlet A good practice is to check for debris each time the air filters are changed In the event the vent outlet becomes blocked do not attempt to start the appliance in heat mode until the entire vent opening is cleared In the event the unit shut down because the vent was blocked a qualified technician or service agency shall monitor the unit prior to re starting The gas burner and hea...

Page 107: ...against the unit bulkhead Figure 59 Gas Heat Exchanger Attach the heat exchanger to the bulkhead using the holes around the perimeter Connect flex gas lines to the piping on the heat exchanger If flexible gas piping in the unit must be replaced connectors cannot be reused only new connectors may be used Connect wiring per the wiring diagram on the controls compartment door Purge gas lines to the g...

Page 108: ...of power DPM Setup Procedure With the supply voltage active to the module you can setup all of the DPM s settings without the line voltage connected To change the setpoint parameters use the right arrow key to advance forward through the setpoint parameters and the left arrow to backup if needed When each parameter is displayed use the up down keys to change and set the parameter After adjustments...

Page 109: ...ime Delay Screen Vertical Format Default 2 sec Manual 2S 3S 4S 5S 6S 7S 8S 9S 10S 30S 1M 2M 3M 4M Phase Imbalance Percentage Screen Vertical Format Default 5 3 4 5 6 7 8 9 10 Fault Screen Vertical Format 0 most recent faults 1 previous fault 2 third oldest fault 3 fourth oldest fault Fault Words Phase a Loss There is no voltage sensed on 3 L1 S Voltage Low Average line voltage is less than selecte...

Page 110: ...ith the size indicated on each filter or as shown in the tables below Arrow on the replacement filters must point towards the blower RAB Return Air Bypass PE PowerExhaust and PR Power Return Table 37 6 8 and 10 ton Pre Filters Feature 6A Quantity Size Type 0 No Pre Filters A E F H 4 16 x 20 x 2 Pleated MERV 8 B E G H 2 16 x 20 x 1 Metal Mesh Outside Air C 2 40 x 16 x 5 16 Lint Screen with RAB Feat...

Page 111: ... 25 x 1 Metal Mesh Outside Air C 2 55 x 25 x 5 16 Lint Screen with RAB Feature A2 Q R 3 55 x 16 x 5 16 Table 40 26 31 and 40 ton Pre Filters Feature 6A Quantity Size Type 0 No Pre Filters A E F H 8 24 x 24 x 2 Pleated MERV 8 with RAB Feature A2 Q R 16 12 x 24 x 2 A E F H 6 16 x 25 x 1 Metal Mesh Outside Air with PE or PR Feature 1A B C 4 16 x 25 x 1 C 8 24 x 24 x 5 16 Lint Screen Table 41 50 60 an...

Page 112: ...3 40 x 24 x 5 16 Table 43 90 140 ton Pre Filters Feature Quantity Size Type 6A 6B 0 0 B C F G H No Pre Filters A E F H 0 B C F G H 21 20 x 24 x 2 7 16 x 20 x 2 Pleated MERV 8 B E G H 0 B C F G H 28 20 x 20 x 1 Metal Mesh Outside Air C 0 C 11 20 x 18 x 5 16 12 40 x 18 Lint Screen C B F G H 2 40 x 16 x 5 16 6 40 x 24 x 5 16 1 60 x 16 x 5 16 3 60 x 24 x 5 16 Table 44 26 31 50 60 and 70 ton Preheat Fi...

Page 113: ... 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 MERV 11 G Pleated MERV 13 H Pleated MERV 14 Table 46 9 and 11 ton Unit Filters Feature 6B Quantity Size Type 0 4 20 x 25 x 2 Pleated MERV 8 with RAB Feature A2 Q R 6 12 x 24 x 2 B 4 20 x 25 x 4 Pleated MERV 8 with RAB Feature A2 Q R 6 12 x 24 x 4 C 4 20 x 25 x 2 Permanent Filter Frame Replaceable Media with RAB ...

Page 114: ...AB Feature A2 Q R 6 12 x 24 x 2 F 4 20 x 25 x 4 Pleated MERV 11 G Pleated MERV 13 H Pleated MERV 14 Table 48 14 16 25 and 30 ton Unit Filters Feature 6B Quantity Size Type 0 6 20 x 25 x 2 Pleated MERV 8 with RAB Feature A2 Q R 9 16 x 20 x 2 B 6 20 x 25 x 4 Pleated MERV 8 with RAB Feature A2 Q R 9 16 x 20 x 4 C 6 20 x 25 x 2 Permanent Filter Frame Replaceable Media with RAB Feature A2 Q R 9 16 x 20...

Page 115: ...ture A2 Q R 16 12 x 24 x 4 G 8 24 x 24 x 4 Pleated MERV 13 with RAB Feature A2 Q R 16 12 x 24 x 4 H 8 24 x 24 x 4 Pleated MERV 14 with RAB Feature A2 Q R 16 12 x 24 x 4 Table 50 RN Series 50 60 and 70 ton Unit Filters Feature 6B Quantity Size Type 0 24 12 x 24 x 2 Pleated MERV 8 with RAB Feature A2 Q R 28 12 x 24 x 2 B 24 12 x 24 x 4 Pleated MERV 8 with RAB Feature A2 Q R 28 12 x 24 x 4 C 24 12 x ...

Page 116: ...x 4 Pleated MERV 8 C 35 18 x 20 x 2 Permanent Filter Frame Replaceable Media F 21 20 x 24 x 4 7 16 x 20 x 4 Pleated MERV 11 G Pleated MERV 13 H Pleated MERV 14 Table 53 6 8 and 10 ton Energy Recovery Wheel Filters Feature 1A Quantity Size Type F G H J Q R S T Prior to August 2014 1 25 x 16 x 4 Pleated MERV 8 Prior to August 2014 With Energy Recovery Wheel Exhaust Air Filters Feature 6A D F G H OA ...

Page 117: ... With Energy Recovery Wheel Exhaust Air Filters Feature 6A D F G H OA 4 20 x 12 x 2 EA 2 16 x 20 x 2 Table 55 14 16 25 and 30 ton Energy Recovery Wheel Filters Feature 1A Quantity Size Type F G H J Q R S T U V W Y Z 1 2 3 Prior to August 2014 3 20 x 25 x 4 Pleated MERV 8 Prior to August 2014 With Energy Recovery Wheel Exhaust Air Filters Feature 6A D F G H OA 3 20 x 25 x 2 EA 6 14 x 20 x 2 After A...

Page 118: ...s Feature 6A D F G H OA 4 24 x 24 x 2 EA 8 16 x 20 x 2 After August 2014 With Energy Recovery Wheel Exhaust Air Filters Feature 6A D F G H OA 8 24 x 18 x 2 EA 8 16 x 20 x 2 4 Prior to August 2014 3 24 x 24 x 4 After August 2014 With V Bank Outside Air Filters OA 6 24 x 24 x 2 With Outside Air Preheat 3 24 x 24 x 4 Prior to August 2014 With Energy Recovery Wheel Exhaust Air Filters Feature 6A D F G...

Page 119: ... Y Z 1 2 3 14 24 x 20 x 2 With Energy Recovery Wheel Exhaust Air Filters Feature 6A D F G H OA 14 20 x 24 x 2 EA 14 25 x 16 x 2 6 8 and 10 ton Units 9 and 11 15 ton Units 16 25 and 30 ton Units 26 31 and 40 ton Units 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 ar...

Page 120: ...amside of the cooling coil Replacement Parts Parts for AAON equipment may be obtained from your local AAON representative Reference the unit serial number and part number when ordering parts AAON Warranty Service and Parts Department 2425 S Yukon Ave Tulsa OK 74107 Ph 918 382 6450 techsupport aaon com www aaon com Note Before calling technician must have model and serial number of the unit availab...

Page 121: ...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 Alloy Alkalinity HCO3 70 Within 24 Hours 0 70 300 300 0 Sulfate SO4 2 70 No Limit 70 300 0 300 0 0 HCO3 SO4 2 1 0 No Limit 1 0 0 Electrical Conductivity 10µS cm No Limit 0 10 500 µS cm 500 µS cm 0 pH ...

Page 122: ...mit 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 316 SS 316 50 ppm SS 304 SS 316 SS 316 Ti SMO 254 80 ppm SS 316 SS 316 SS 316 Ti SMO 254 150 ppm SS 316 SS 316 Ti SMO 254 Ti SMO 254 300 ppm SS 316 Ti SMO 254 Ti SMO 254 Ti SMO 254 300 ppm Ti SMO 254...

Page 123: ...8 107 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 20 90 194 7 87 95 203 6 77 100 212 5 85 105 221 5 09 110 230 4 45 115 239 3 87 120 248 3 35 125 257 2 92 130 266 2 58 135 275 2 28 140 284 2 02 145 293 1 80 150 302 1 59 155 311 1 39 160 320 1 25 165 ...

Page 124: ...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 for tightness Yes No 6 Does the electrical service correspond to the unit nameplate Yes No 7 On 208 230V units has transformer tap been checked Yes No 8 Has overcurrent protection been installed to match the un...

Page 125: ...onomizer Changeover Type and Operations Damper Wiring Check Gears Check Ambient Temperature Ambient Dry Bulb Temperature ________ F Ambient Wet Bulb Temperature ________ F Unit Configuration Water Cooled Condenser Air Cooled Condenser No Water Leaks Condenser Safety Check Water Flow ________GPM Water Inlet Temperature ________ F Water Outlet Temperature ________ F Compressors DXCooling Number stag...

Page 126: ...id 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 only Pressure Saturated Temperature Line Temperature Sub cooling Superheat Discharge N A N A Suction N A Liquid N A Refrigeration System 2 Heating Mode Heat Pump only Pressure Saturated Temperature Li...

Page 127: ...led 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 load Yes No 6 Has the water piping been insulated Yes No 7 What is the freeze point of the glycol N A if water _______________________________ Gas Heating Natural Gas Propane Purge Air from Lines Ver...

Page 128: ...ith 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 The responsibility for proper start up maintenance and servicing of the equipment falls to the owner and qualified licensed technician En...

Page 129: ...Maintenance Log E Coated Coil ...

Page 130: ...79510 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 Heater Operation section to have the same sequence of operation for both natural gas and propane gas heaters September 2009 Update of the IOM adding Refrigerant to Water heat exchanger and Thermostat C...

Page 131: ...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 information added auxiliary electric heating capacities table added section for microchannel coil cleaning added section for variable capacity compressor controller and added Appendix B October 2013 Corre...

Page 132: ...o state that a screen strainer is factory provided ahead of the condenser inlet and a pressure relief device may be provided on the heat exchanger July 2015 Removed 2 Throwaway Unit Filter 25 Efficient from Filter Replacement information Table 4 C Cabinet Unit Clearances revised October 2015 Added Additional Gas Piping Considerations November 2015 Water Piping and Filter sections were updated Febr...

Page 133: ...s Feature 14A Added Shaft Grounding options Feature 1B and Feature 5A Added High Condensate Level Switch Feature 11 Added Shrink Wrap Options Feature 20 Added High Turndown Modulating Gas option Feature B3 Updated modulating gas turndown ratios Updated Note on MPT fitting August 2017 Updated Table 53 55 65 and 75 140 ton Energy Recovery Wheel Filters Updated Tables 38 39 Pre Filter information 55 ...

Page 134: ...with AAON Orion Controls System references February 2019 Updated E Coated Coil Cleaning Condenser Fan ECM Startup and VFD Controlled Condenser Fan Startup sections Updated Feature 1C of the RN Series Feature String Nomenclature March 2019 Updated Feature 9 Refrigeration Accessories options April 2019 Added Nameplate Voltage Markings Table June 2019 E Coated Coil Cleaning section updated Updated Fe...

Page 135: ...ed e coating maintenance log Updated condensate drain pan section showing p traps are no longer provided on any size unit Updated the size of the heat exchanger condensate drain connection from PVC to 3 4 PVC connection for RN sizes 55 65 and 75 140 tons Added the Aluminum Energy Recovery section January 2022 Added some circuit breakers sizes to Feature 10 Power Options Added Outside Airflow Monit...

Page 136: ... Support please have the model and serial number of the unit available Parts For replacement parts please contact your local AAON Representative 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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