AAON SB series Owner's manual

SB Series
Vertical Self-Contained Units
Installation, Operation
& Maintenance
If the information in this manual is not
followed exactly, a fire or explosion
may result causing property damage,
personal injury or loss of life.
FOR YOUR SAFETY
Do not store or use gasoline or other
flammable vapors and liquids in the
vicinit
y
of this or an
y
other appliance.
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QUALIFIED INSTALLER
Improper installation, adjustment,
alteration, service or maintenance
can cause property damage,
personal injury or loss of life. Startup
and service must be performed by a
Factory Trained Service Technician.
A copy of this IOM should be kept
with the unit.
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3
Table of Contents
AAON SB Series Features and Options Introduction ..................................................................... 6
Safety .............................................................................................................................................. 7
SB Series Feature String Nomenclature ....................................................................................... 12
General Information ...................................................................................................................... 16
Codes and Ordinances .............................................................................................................. 16
Receiving Unit .......................................................................................................................... 17
Storage ...................................................................................................................................... 17
Direct Expansion (DX) Systems ............................................................................................... 17
Wiring Diagrams ....................................................................................................................... 18
Condensate Drain Pans ............................................................................................................. 18
Installation..................................................................................................................................... 19
Locating the Unit ...................................................................................................................... 19
Lifting and Handling the Unit ................................................................................................... 20
Unit Assembly .......................................................................................................................... 20
Refrigerant-to-Water Heat Exchanger Water Piping ................................................................ 22
Electrical ................................................................................................................................... 26
Duct Connection ....................................................................................................................... 29
Condensate Drain Piping .......................................................................................................... 29
Waterside Economizer .............................................................................................................. 30
Heating Coils ............................................................................................................................ 31
Energy Recovery Units ............................................................................................................. 31
Initial Mechanical Check and Setup ..................................................................................... 32
Routine Maintenance and Handling ...................................................................................... 33
Cleaning ................................................................................................................................ 34
Wheel Drive Components ..................................................................................................... 35
Startup Procedure .................................................................................................................. 35
Service ................................................................................................................................... 36
Startup ........................................................................................................................................... 39
Supply Fans ............................................................................................................................... 39
Fan Air Flow Adjustment ......................................................................................................... 39
Filters ........................................................................................................................................ 40
Adjusting Refrigerant Charge ................................................................................................... 40
Freeze Stat Startup .................................................................................................................... 42
Operation....................................................................................................................................... 44
Packaged DX Cooling Operation and Control ......................................................................... 44
Electric Heating Operation ....................................................................................................... 44
Steam or Hot Water Preheating Operation ............................................................................... 44
Maintenance .................................................................................................................................. 44
DX Cooling ............................................................................................................................... 45
Condensate Drain Pans ............................................................................................................. 45
E-Coated Coil Cleaning ............................................................................................................ 45
Supply Fans ............................................................................................................................... 47
Phase and Brownout Protection Module .................................................................................. 48
Filter Replacement .................................................................................................................... 50
Replacement Parts ..................................................................................................................... 50

4
AAON Longview Product Support ........................................................................................... 50
Filter Information .......................................................................................................................... 51
Appendix A - Heat Exchanger Corrosion Resistance ................................................................... 54
Index of Tables and Figures
Tables:
Table 1 - SB Series Clearances ..................................................................................................... 19
Table 2 - Glycol Freezing Points .................................................................................................. 24
Table 3 - Condenser Water Connections ...................................................................................... 25
Table 4 – Water Connection Locations ........................................................................................ 25
Table 5 - Control Wiring ............................................................................................................... 29
Table 6 - Drain Trap Dimensions ................................................................................................. 30
Table 7 - Acceptable Water-Cooled Refrigeration Circuit Values ............................................... 41
Table 8 - R-410A Refrigerant Temperature-Pressure Chart ......................................................... 43
Table 9 - 3-5 ton (B Cabinet) Pre and Unit Filters ....................................................................... 51
Table 10 - 6-10 ton (C Cabinet) Pre and Unit Filters ................................................................... 51
Table 11 - 14-18 ton (D Cabinet) Pre and Unit Filters ................................................................. 51
Table 12- 3-5 ton (B Cabinet) Mixing Box Filters ....................................................................... 52
Table 13 - 6-10 ton (C Cabinet) Mixing Box Filters .................................................................... 53
Table 14 - 14-18 ton (D Cabinet) Mixing Box Filters .................................................................. 53
Table 15 - Condenser Water Connections updated. ..................................................................... 60
Figures:
Figure 1 - Lockable Handle .......................................................................................................... 17
Figure 2 - SB Series ...................................................................................................................... 19
Figure 3 - SB Series Unit Orientation ........................................................................................... 20
Figure 4 - SB Schematic with (1) Exhaust Fan, (2) Energy Recovery, (3) Air Handler, and (4)
Electric Heat (5) Compressor Section ........................................................................................... 21
Figure 5 - Connect Sections .......................................................................................................... 21
Figure 6 - Bar Clamp .................................................................................................................... 21
Figure 7 - Flange Overlap ............................................................................................................. 21
Figure 8 - Self-Tapping Screw ...................................................................................................... 21
Figure 9 - Strap Types................................................................................................................... 22
Figure 10 - Low Voltage Quick Connect ...................................................................................... 22
Figure 11- Water Connections for Water-Source Heat Pumps ..................................................... 25
Figure 12 - Electrical Connection ................................................................................................. 26
Figure 13 - Drain Trap .................................................................................................................. 30
Figure 14 - Energy Recovery Wheel ............................................................................................ 32
Figure 15 - Cross Section of Air Seal Structure ........................................................................... 32
Figure 16 - Lifting Hole Locations ............................................................................................... 33
Figure 17 - Avoid Racking of Cassette Frame .............................................................................. 35
Figure 18 - Diameter Seal Adjustment ......................................................................................... 36
Figure 19 - Hub Seal Adjustment ................................................................................................. 36

5
Figure 20 - Segment Retainer ....................................................................................................... 37
Figure 21 - Segment Installation ................................................................................................... 37
Figure 22 - Belt Replacement ....................................................................................................... 38
Figure 23 - SB Series Supply Fan ................................................................................................. 39
Figure 24- Typical wiring diagram with EC motor ...................................................................... 39
Figure 25 - Shows the jumper that is to be removed (jumped between 9 and GS). ..................... 40
Figure 26 - Potentiometer ............................................................................................................. 40
V14190 · Rev. C · 190129
(ACP 31227)

6
AAON SB Series Features and Options Introduction
Energy Efficiency
 Direct Drive Backward Curved Plenum
Supply Fans
 10-100% Variable Capacity Scroll
Compressors
 Double Wall Rigid Polyurethane Foam
Injected Panel Construction
 Airside and Waterside Economizers
 Modulating SCR Electric Heat
 Modulating Head Pressure Control
 High Efficiency Electronically
Commutated Motors
 Coaxial Refrigerant-to-Water Heat
Exchanger
 Water-Source and Geothermal Heat
Pumps
 Single Zone Variable Air Volume
 Energy Recovery Wheels
Indoor Air Quality
 Up to 100% Outside Air with Optional
Electric Pre-Heat
 Multiple High Efficiency Unit and
Mixing Box Filters
 Double Wall Construction with No
Exposed Insulation
 Stainless Steel Drain Pans
Humidity Control
 10-100% Variable Capacity Scroll
Compressors
 Modulating Hot Gas Reheat
Safety
 Freeze Stats
 Phase and Brown Out Protection
Installation and Maintenance
 Direct Drive Backward Curved Plenum
Supply Fans
 Clogged Filter Switch and Magnehelic
Gauge
 Color Coded Wiring Diagram
 Isolated Compressor and Controls
Compartment
 Compressor Isolation Valves
 Hinged Access Doors with Lockable
Handles
 Liquid Line Sight Glass
 Split Configuration for Retrofit or Space
Limited Applications
System Integration
 Customer Provided Controls
 Electric, Steam, or Hot Water Heating
 Refrigerant-to-Water Heat Exchangers
 Condensing Unit Only Options
 Split System Configurations
Environmentally Friendly
 R-410A Refrigerant
 Geothermal Heat Pump Configurations
Extended Life
 Standard 5 Year Compressor Warranty
 Double Wall Rigid Polyurethane Foam
Injected Cabinet Construction
 2,500 Hour Salt Spray Tested Interior
and Exterior Corrosion Protection
 Polymer E-Coated Coils - 5 Year Coating
Warranty
 Stainless Steel Drain Pans
 Custom Color Paint Options

7
Safety
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 unit. 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.
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Electric shock hazard. Before
servicing, disconnect all electrical
power to the unit, including remote
disconnects, to avoid shock hazard
or injury from rotating parts. Follow
proper Lockout-Tagout procedures.
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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.
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Attention should be paid to the following statements:
NOTE - Notes are intended to clarify the unit installation, operation and maintenance.
CAUTION - Caution statements are given to prevent actions that may result in
equipment damage, property damage, or personal injury.
WARNING - Warning statements are given to prevent actions that could result in
equipment damage, property damage, personal injury or death.
DANGER - Danger statements are given to prevent actions that will result in equipment
damage, property damage, severe personal injury or death.

8
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, should be
followed.
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GROUNDING REQUIRED
All field installed wiring must be
completed by qualified personnel.
Field installed wiring must 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.
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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.
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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.
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9
Failure to properly drain and vent
coils when not in use during freezing
temperature may result in coil and
equipment damage.
C
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N
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
should be checked for proper
operation. Alterations should only be
made at the unit power connection
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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 should be field supplied on
system water piping.
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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.
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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.
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Do not work in a closed area where
refrigerant or nitrogen gases may be
leaking. A sufficient quantity of
vapors may be present and cause
injury or death.
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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.
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10
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.
C
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N
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.
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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
Cleaning the cooling tower or the
condenser water loop with harsh
chemicals, such as hydrochloric acid
(muriatic acid) or chlorine, can
damage the water-cooled condenser.
Care should be taken to avoid
allowing chemicals to enter the
water-cooled condenser. See
Appendix A - Heat Exchanger
Corrosion Resistance for more
information.
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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.
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WATER FREEZING
Failure of the condenser due to
freezing will allow water to enter the
refrigerant circuit and will cause
extensive damage to the refrigerant
circuit components. Any damage to
the equipment as a result of water
freezing in the condenser is excluded
from coverage under AAON
warranties and the heat exchanger
manufacturer warranties.
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