AAON RN Series Owner's manual

RN Series
E Cabinet
Packaged Rooftop Units
& Outdoor Air Handling Units
Installation, Operation,
& Maintenance
oDo not store gasoline or other flammable
vapors and liquids in the vicinity of this or any
other appliance
oWHAT TO DO IF YOU SMELL GAS
Do not try to light any appliance.

Do not touch any electrical switch; do not
use any phone in your building.
Leave the building immediately.

Immediately call your gas supplier from a
phone remote from the building. Follow the
gas supplier’s instructions.

If you cannot reach your gas supplier, call
the fire department.
oStartup and service must be performed by a
Factory Trained Service Technician.
WARNING
FIRE OR EXPLOSION HAZARD
Failure to follow safety warnings
exactly could result in serious
injury, death or property damage.
Be sure to read and understand
the installation, operation, and
service instructions in this manual.
Improper installation, adjustment,
alteration, service, or maintenance
can cause serious injury, death, or
property damage.
A copy of this IOM must be kept
with the unit.
WARNING

3
Table of Contents
AAON®RN Series E Cabinet Features and Options Introduction................................................. 6
Safety .............................................................................................................................................. 7
RN Series E Cabinet Feature String Nomenclature................................................................ 13
General Information...................................................................................................................... 23
Codes and Ordinances............................................................................................................ 24
Receiving Unit.......................................................................................................................... 24
Storage ...................................................................................................................................... 25
Wiring Diagrams....................................................................................................................... 25
Installation..................................................................................................................................... 25
Locating Units........................................................................................................................... 25
Setting the Curb........................................................................................................................ 26
Lifting the Unit ......................................................................................................................... 27
Duct Connection....................................................................................................................... 28
Outside Air Rain Hood............................................................................................................. 29
End Flashing Installation .......................................................................................................... 29
Electrical................................................................................................................................... 30
Variable Speed Compressors................................................................................................ 32
Thermostat Control Wiring................................................................................................... 32
Condensate Drain Piping.......................................................................................................... 33
Draw-Through Coils................................................................................................................. 34
Startup........................................................................................................................................... 35
Filters........................................................................................................................................ 35
Supply Fans............................................................................................................................... 35
Adjusting Refrigerant Charge................................................................................................... 36
Checking Liquid Sub-Cooling.............................................................................................. 36
Checking Evaporator Superheat............................................................................................ 36
Adjusting Sub-cooling and Superheat Temperatures............................................................ 37
Freeze Stat Startup.................................................................................................................... 38
Condenser Fan Electronically Commutated Motor (ECM) Startup ......................................... 40
VFD Controlled Condenser Fan Startup................................................................................... 40
Operation....................................................................................................................................... 41
Thermostat Operation ............................................................................................................... 41
Packaged DX Cooling Operation and Control ......................................................................... 41
Gas Heater Operation................................................................................................................ 41
Electric Heating Operation ....................................................................................................... 42
Steam or Hot Water Preheating and Heating Operation........................................................... 42
Chilled Water or Non-Compressorized DX Cooling Operation............................................... 42
Maintenance.................................................................................................................................. 42
Supply Fans............................................................................................................................... 42
DX Cooling............................................................................................................................... 42
Condensate Drain Pans............................................................................................................. 42
Brazed Plate Heat Exchanger Cleaning.................................................................................... 43
E-Coated Coil Cleaning............................................................................................................ 43
Microchannel Coil Cleaning..................................................................................................... 44
Options.......................................................................................................................................... 46

4
Heating Coils ............................................................................................................................ 46
Chilled Water Coil.................................................................................................................... 47
Packaged Direct Expansion (DX) Units................................................................................... 48
Evaporator Coil......................................................................................................................... 49
Condenser Fans......................................................................................................................... 50
Suction Filter............................................................................................................................. 51
Suction Filter Removal Instructions ..................................................................................... 51
Energy Recovery Units............................................................................................................. 52
Aluminum Energy Recovery Wheel..................................................................................... 52
Polymer Energy Recovery Wheel......................................................................................... 55
Energy Recovery Wheel General Cleaning .......................................................................... 62
Energy Recovery Wheel Defrost Timer Setting .................................................................. 64
Gas or Electric Heating............................................................................................................. 64
Gas Heating............................................................................................................................... 65
Piping Sizing Examples........................................................................................................ 66
Inlet and Manifold Pressures ................................................................................................ 67
Gas Pressure Regulator & Overpressure Protection Device................................................. 67
Piping Supports..................................................................................................................... 67
Additional Gas Piping Considerations.................................................................................. 67
Leak Testing.......................................................................................................................... 70
Gas Heater Operating Instructions........................................................................................ 71
Gas Heating Maintenance..................................................................................................... 72
Gas Heat Exchanger Removal .............................................................................................. 72
Phase and Brownout Protection Module .................................................................................. 74
Filter Replacement.................................................................................................................... 76
Replacement Parts..................................................................................................................... 78
Appendix A - Heat Exchanger Corrosion Resistance................................................................... 79
Appendix B - Thermistor Temperature vs. Resistance Values..................................................... 81
RN Series E Cabinet Startup Form............................................................................................... 82
Maintenance Log .......................................................................................................................... 86
Maintenance Log (E-Coated Coil)................................................................................................ 87
Literature Change History............................................................................................................. 88
Index of Tables and Figures
Tables:
Table 1 - RN Series E Cabinet Unit Clearances........................................................................... 26
Table 2 - Nameplate Voltage Markings & Tolerances................................................................. 30
Table 3 - RN Series E Cabinet Variable Speed Compressor VFD Frequency Range.................. 32
Table 4 - Control Wiring............................................................................................................... 33
Table 5 - Draw-Through Drain Trap Dimensions ........................................................................ 34
Table 6 - Plenum Fan Set Screw Specifications........................................................................... 35
Table 7 - Acceptable Fin & Tube Air-Cooled Condenser Coil Refrigeration Circuit Values...... 37
Table 8 - Acceptable Microchannel Air-Cooled Condenser Coil Liquid Sub-Cooling Values ... 37
Table 9 - R-410A and R-22 Refrigerant Temperature-Pressure Chart......................................... 39
Table 10 - ECM Condenser Fan Cycling Options........................................................................ 40
Table 11 - Hot Water Coil & Steam Coil Connection Sizes......................................................... 47

5
Table 12 - Preheat Hot Water Coil Connection Sizes................................................................... 47
Table 13 - Preheat Steam Coil Connection Sizes ......................................................................... 47
Table 14 - Chilled Water Coil Connection Sizes.......................................................................... 47
Table 15 - Energy Recovery Wheel Cleaning Frequency ............................................................ 62
Table 16 - Electric and Gas Heating Capacities ........................................................................... 65
Table 17 - 55, 65 and 75-140 ton Gas Connections...................................................................... 65
Table 18 - Natural Gas (ft3/hr) Maximum Piping Capacities ....................................................... 66
Table 19 - Propane (kBtu/hr) Maximum Piping Capacities ......................................................... 66
Table 20 - Gas Piping Supports.................................................................................................... 67
Table 21 - 55, 65, and 75 ton Pre Filters....................................................................................... 76
Table 22 - 90-140 ton Pre Filters.................................................................................................. 76
Table 23 - 55, 65, and 75 ton Unit Filters..................................................................................... 77
Table 24 - 90-140 ton Unit Filters ................................................................................................ 77
Table 25 - 55, 65, and 75-140 ton Exhaust Filters........................................................................ 77
Figures:
Figure 1 - Lockable Handle .......................................................................................................... 25
Figure 2 - RN Series E Cabinet,.................................................................................................... 26
Figure 3 - Lifting Details of a 55, 65 and 75-140 ton Unit........................................................... 27
Figure 4 - Duct Connection........................................................................................................... 28
Figure 5 - 55-140 ton .................................................................................................................... 29
Figure 6 - Factory Supplied End Flashings................................................................................... 29
Figure 7 - Unit Utility Entry ......................................................................................................... 31
Figure 8 - Back View of Utility Entry and Power Switch from Control Compartment (55, 65 and
75-140 ton Units).......................................................................................................................... 31
Figure 9 - Draw-Through Drain Trap........................................................................................... 34
Figure 10 - Plenum Fan Gap Tolerances ...................................................................................... 35
Figure 11 - Evaporator Coil Access.............................................................................................. 49
Figure 12 - Removal of a Condenser Fan Assembly.................................................................... 50
Figure 13 - RPE-48-BD filter element.......................................................................................... 51
Figure 14 - Aluminum Energy Recovery Wheel.......................................................................... 52
Figure 15 - Aluminum ERW Purge Sector Location.................................................................... 53
Figure 16 - Polymer Energy Recovery Wheel.............................................................................. 55
Figure 17 - Wheel Segment Removal Pattern............................................................................... 59
Figure 18 - Defrost Timer............................................................................................................. 64
Figure 19 - Temperature Dial ....................................................................................................... 64
Figure 20 - RN Series E Cabinet Gas Heat Exchanger................................................................. 66
Figure 21 - Example 55, 65 and 75-140 ton for across the Roof Gas Piping............................... 69
Figure 22 - Gas Heater Instructions.............................................................................................. 71
Figure 23 - Gas Heat Exchanger................................................................................................... 73
Figure 24 - RN Series E Cabinet Standard Filter Layouts............................................................ 78
G088500 · Rev. A · 210513

6
AAON®RN Series E Cabinet Features and Options Introduction
Energy Efficiency
Direct Drive Backward Curved Plenum
Supply Fans
Variable Speed R-410A Scroll
Compressors
Airside Economizers
Factory Installed AAONAIRE®Energy
Recovery Wheels
Double Wall Rigid Polyurethane Foam
Panel Construction, R-13 Insulation
Modulating Natural Gas Heaters
Modulating/SCR Electric Heaters
Premium Efficiency Motors
Variable Speed Supply/Return/Exhaust
Fans
Indoor Air Quality
100% Outside Air
Constant Volume Outside Air Control
Economizer CO2Override
High Efficiency Filtration
Double Wall Rigid Polyurethane Foam
Panel Construction, R-13 Insulation
Interior Corrosion Protection
Humidity Control
High Capacity Cooling Coils
Variable Speed Compressors
Factory Installed AAONAIRE Total
Energy Recovery Wheels
Mixed/Return 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 Supply Fans
Hinged Access Doors with Lockable
Handles
Magnehelic Gauge
Service Lights
Sight Glass
System Integration
Chilled Water Cooling Coils
Controls by Others
Electric/Natural Gas/LP Heating
Hot Water/Steam Heating Coil
Non-Compressorized DX Coils
Environmentally Friendly
Airside Economizers
Factory Installed AAONAIRE Energy
Recovery Wheels
Mixed/Return Air Bypass
R-410A Refrigerant
Extended Life
5 Year Compressor Warranty
15 Year Aluminized Steel Heat
Exchanger Warranty
25 Year Stainless Steel Heat Exchanger
Warranty
Condenser Coil Guards
Interior Corrosion Protection
Coil Polymer E-Coating - 5 Year Coating
Warranty
Stainless Steel Coil Casing
Stainless Steel Drain Pans

7
Safety
Attention must be paid to the following statements:
NOTE - Notes are intended to clarify the unit installation, operation, and maintenance.
CAUTION - Caution statements are given to prevent actions that mayresult 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.
DANGER - Danger statements are given to prevent actions that will result in equipment
damage, property damage, severe personal injury or death.
ELECTRIC SHOCK, FIRE OR
EXPLOSION HAZARD
Failure to follow safety warnings
exactly could result in dangerous
operation, serious injury, death or
property 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 TO DO IF YOU SMELL GAS
Do not try to turn on unit.
Shut off main gas supply.
Do not touch any electric switch.

Do not use any phone in the
building.

Never test for gas leaks with an
open flame.

Use a gas detection soap solution
and check all gas connections and
shut off valves.
CAUTION
Electric shock hazard. Before
servicing, shut off all electrical power
to the unit, including remote
disconnects, to avoid shock hazard or
injury from rotating parts. Follow
proper Lockout-Tagout procedures.
WARNING

8
FIRE, EXPLOSION OR CARBON
MONOXIDE POISONING HAZARD
Failure to replace proper controls
could result in fire, explosion, or
carbon monoxide poisoning. Failure to
follow safety warnings exactly could
result in serious injury, death or
property damage. Do not store or use
gasoline or other flammable vapors
and liquids in the vicinity of this
appliance.
WARNING
CARBON MONOXIDE POISONING
HAZARD
Failure to follow instructions could
result in severe personal injury or
death due to carbon-monoxide
poisoning, if combustion products
infiltrate into the building.
Check that all openings in the outside
wall around the vent (and air intake)
pipe(s) are sealed to prevent
infiltration of combustion products 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 tasks.
Standard NFPA-70E, an OSHA
regulation requiring an Arc Flash
Boundary to be field established and
marked for identification of where
appropriate Personal Protective
Equipment (PPE) be worn, must be
followed.
WARNING
Unit power supply wire must be only
copper or aluminum.
CAUTION
ROTATING COMPONENTS
Unit contains fans with moving parts
that can cause serious injury. Do not
open door containing fans until the
power to the unit has been
disconnected and fan wheel has
stopped rotating.
WARNING

9
GROUNDING REQUIRED
All field installed wiring must be
completed by qualified personnel.
Field installed wiringmust comply with
NEC/CEC, local and state electrical
code requirements. Failure to follow
code requirements could result in
serious injury or death. Provide proper
unit ground in accordance with these
code requirements.
WARNING
VARIABLE FREQUENCY DRIVES
Do not leave VFDs unattended in
hand mode or manual bypass.
Damage to personnel or equipment
can occur if left unattended. When in
hand mode or manual bypass mode
VFDs will not respond to controls or
alarms.
WARNING
Electric motor over-current protection
and overload protection may be a
function of the Variable Frequency
Drive to which the motors are wired.
Never defeat the VFD motor overload
feature. The overload ampere setting
must not exceed 115% of the 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 freezing
temperature may result in coil and
equipment damage.
CAUTION
Rotation must be checked on all
MOTORS AND COMPRESSORS of 3
phase units at startup by a qualified
service technician. Scroll
compressors are directional and can
be damaged if rotated in the wrong
direction. Compressor rotation must
be checked using suction and
discharge gauges. Fan motor rotation
must be checked for proper operation.
Alterations must only be made at the
unit power connection
CAUTION
Do not use oxygen, acetylene or air in
place of refrigerant and dry nitrogen
for leak testing. A violent explosion
may result causing injury or death.
WARNING

10
WATER PRESSURE
Prior to connection of condensing
water supply, verify water pressure is
less than maximum pressure shown
on unit nameplate. To prevent injury
or death due to instantaneous release
of high pressure water, relief valves
must be field supplied on system
water piping.
WARNING
Always use a pressure regulator,
valves and gauges to control incoming
pressures when pressure testing a
system. Excessive pressure may
cause line ruptures, equipment
damage or an explosion which may
result in injury or death.
WARNING
To prevent damage to the unit, do not
use acidic chemical coil cleaners. Do
not use alkaline chemical coil cleaners
with 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 water or steam. The use of hot
water or steam on refrigerant coils will
cause high pressure inside the coil
tubing and damage to the coil.
CAUTION
Door compartments containing
hazardous voltage or rotating parts
are equipped with door latches to
allow locks. Door latch are shipped
with nut and bolts requiring tooled
access. If you do not replace the
shipping hardware with a pad lock
always re-install the nut & bolt after
closing the door.
CAUTION