AAON SA-028 Owner's manual

SA SERIES
Vertical Self-Contained Units and
Indoor Air Handling 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
vicinity of this or any other appliance.
WARNING
WARNING
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.
WARNING

3
Table of Contents
Safety .............................................................................................................................................. 6
SA Series Feature String Nomenclature....................................................................................... 11
General Information...................................................................................................................... 16
Codes and Ordinances............................................................................................................... 16
Receiving Unit........................................................................................................................... 16
Storage....................................................................................................................................... 17
Direct Expansion (DX) Systems ............................................................................................... 17
Wiring Diagrams....................................................................................................................... 18
Condensate Drain Pans.............................................................................................................. 18
Unit Size.................................................................................................................................... 18
Installation..................................................................................................................................... 19
Locating the Unit....................................................................................................................... 19
Lifting and Handling the Unit....................................................................................................... 19
Split Unit Assembly.................................................................................................................. 26
Refrigerant-to-Water Heat Exchanger ...................................................................................... 29
Open Loop Applications........................................................................................................ 29
Freezing Water in the Heat Exchanger.................................................................................. 29
Water Piping.......................................................................................................................... 30
Brazed Plate Heat Exchanger Cleaning................................................................................. 33
Electrical.................................................................................................................................... 33
Cutting Electrical Openings................................................................................................... 34
Thermostat Control Wiring.................................................................................................... 35
Duct Connection........................................................................................................................ 36
Condensate Drain Piping........................................................................................................... 36
Waterside Economizer .............................................................................................................. 37
Hot Water Coil .......................................................................................................................... 41
Chilled Water Coil .................................................................................................................... 41
Startup........................................................................................................................................... 41
Supply Fans............................................................................................................................... 41
Supply Fan Spring Isolator Adjustment ................................................................................ 41
Supply Fan Removal.............................................................................................................. 43
Fan Airflow Adjustment........................................................................................................ 43
Filters......................................................................................................................................... 45
Adjusting Refrigerant Charge ................................................................................................... 45
Freeze Stat Startup .................................................................................................................... 47
Operation....................................................................................................................................... 48
Steam or Hot Water Preheating Operation................................................................................ 48
Chilled Water or Non-Compressorized DX Cooling Operation............................................... 48
Packaged DX Cooling Operation and Control.......................................................................... 48
Maintenance.................................................................................................................................. 48
DX Cooling ............................................................................................................................... 48
Condensate Drain Pans.............................................................................................................. 48
E-Coated Coil Cleaning ............................................................................................................ 49
Recommended Coil Cleaner.................................................................................................. 49

Recommended Chloride Remover......................................................................................... 50
Supply Fans............................................................................................................................... 50
Phase and Brownout Protection Module................................................................................... 51
Filter Replacement .................................................................................................................... 53
Replacement Parts..................................................................................................................... 54
AAON Warranty, Service, and Parts Department..................................................................... 54
Appendix A - Heat Exchanger Corrosion Resistance................................................................... 55
SA Series Startup Form ................................................................................................................ 57
Maintenance Log .......................................................................................................................... 61
Literature Change History............................................................................................................. 62
R74130 · Rev. E · 170925

5
Index of Tables and Figures
Tables:
Table 1 - SA Series Models.......................................................................................................... 18
Table 2 - Glycol Freezing Points.................................................................................................. 30
Table 3 - Condenser Water Connections...................................................................................... 31
Table 4 - Condenser Pressure Drops (Each Heat Exchanger)...................................................... 32
Table 5 - Control Wiring............................................................................................................... 35
Table 6 - Duct Connection Sizes .................................................................................................. 36
Table 7 - Drain Trap Dimensions ................................................................................................. 37
Table 8 - Acceptable Refrigerant Circuit Values.......................................................................... 46
Table 9 - R-410A Refrigerant Temperature-Pressure Chart......................................................... 47
Table 10 - 23-35 tons, Pre Filters.................................................................................................. 53
Table 11 - 45-70 tons, Pre Filters.................................................................................................. 53
Table 12 - 23-35 tons, Unit Filters................................................................................................ 53
Table 13 - 45-70 tons, Unit Filters................................................................................................ 53
Figures:
Figure 1 - SA Series Unit with Right Intake................................................................................. 19
Figure 2 - One Piece Single Unit Lifting Details.......................................................................... 20
Figure 3 - Two Piece Single Unit Coil Section Lifting Details.................................................... 21
Figure 4 - Two Piece Single Unit Fan Section Lifting Details..................................................... 22
Figure 5 - One Piece Dual Unit Lifting Details............................................................................ 23
Figure 6 - Two Piece Dual Unit Coil Section Lifting Details....................................................... 24
Figure 7 - Two Piece Dual Unit Fan Section Lifting Details ....................................................... 25
Figure 8 - Dual unit without splices and before being bolted together......................................... 27
Figure 9 - Dual Unit Assembly Details......................................................................................... 27
Figure 10 - Dual unit with splices after being bolted together. .................................................... 28
Figure 11 - Drain Trap.................................................................................................................. 36
Figure 12 - SA Series Unit with Waterside Economizer Piping................................................... 38
Figure 13 - Air Conditioner Waterside Economizer Piping Kit................................................... 39
Figure 14 - Air Conditioner Waterside Economizer Back View.................................................. 39
Figure 15 - Water-Source Heat Pump Waterside Economizer Piping Kit.................................... 40
Figure 16 - Water-Source Heat Pump Waterside Economizer Back View .................................. 40
Figure 17 - Spring Isolation.......................................................................................................... 42
Figure 18 - Back View with Supply Fan Access Panel Removed................................................ 43
Figure 19 - Front View with Supply Fan Access Door Open....................................................... 43
Figure 20 - Blower Wheel with Band........................................................................................... 44
Figure 21 - Band Tabs................................................................................................................... 44
Figure 22 - Blower Wheel............................................................................................................. 44
Figure 23 - Securing the Band ...................................................................................................... 45

6
Safety
Attention should be paid to the following statements:
NOTE - Notes are intended to clarify the unit installation, operation and maintenance.
CAUTION - Caution statements are given to prevent actions that may result in
equipment damage, property damage, or personal injury.
WARNING - Warning statements are given to prevent actions that could result in
equipment damage, property damage, personal injury or death.
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 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.
WARNING
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.
WARNING
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

7
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
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.
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.
WARNING
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
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
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
motors FLA rating as shown on the
motor nameplate.
CAUTION
Failure to properly drain and vent
coils when not in use during freezing
temperature may result in coil and
equipment damage.
CAUTION

8
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.
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.
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
WARNING
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
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
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.
WARNING
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
CAUTION

9
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
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.
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 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.
WARNING
PVC (Polyvinyl Chloride) and CPVC
(Chlorinated Polyvinyl Chloride) are
vulnerable to attack by certain
chemicals. Polyolester (POE) oils
used with R-410A and other
refrigerants, even in trace amounts,
in a PVC or CPVC piping system will
result in stress cracking of the piping
and fittings and complete piping
system failure.
CAUTION

10
1. Startup and service must be performed
by a Factory Trained Service
Technician.
2. The unit is for indoor use only. See
General Information section for more
unit information.
3. 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.
4. READ THE ENTIRE INSTALLATION,
OPERATION AND MAINTENANCE
MANUAL. OTHER IMPORTANT
SAFETY PRECAUTIONS ARE
PROVIDED THROUGHOUT THIS
MANUAL.
5. Keep this manual and all literature
safeguarded near or on the unit.
COMPRESSOR CYCLING
5 MINUTE MINIMUM OFF TIME
To prevent motor overheating
compressors must cycle off for a
minimum of 5 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 6
starts per hour.
WARNING

SA Series Feature String Nomenclature
GEN
SIZE
VLT
CONFIG
A1
A2
A3
A4
B1
B2
B3
1A
1B
1C
1D
2
3
4
5A
5B
5C
6A
6B
6C
7
8
9
10
11
12
13
14A
14B
15
SA
-
035
-
3
-
A
-
E
R
0
9
-
0
0
0
:
A
C
0
0
-
0
0
0
-
E
B
F
-
A
B
0
-
0
0
0
0
0
0
0
-
H
A
-
0
0
0
0
0
0
0
0
B
16
17
18
19
20
21
22
23
11
SASer ies Feature StringNome nclature
MODEL OPTIONS
Series and Generation
SA
Unit Size
023 = 23 ton Capacity
028 = 28 ton Capacity
030 = 30 ton Capacity
035 = 35 ton Capacity
045 = 45 ton Capacity
050 = 50 ton Capacity
055 = 55 ton Capacity
058 = 58 ton Capacity
060 = 60 ton Capacity
065 = 65 ton Capacity
070 = 70 ton Capacity
Voltage
2 = 230V/3Φ/60Hz
3 = 460V/3Φ/60Hz
4 = 575V/3Φ/60Hz
8 = 208V/3Φ/60Hz
Intake Configuration / Interior Protection
A = Left Intake
B = Right Intake
C = Combination - Left and Right Intake
D = Option A + Interior Corrosion Protection
E = Option B + Interior Corrosion Protection
F = Option C + Interior Corrosion Protection
A1: Refrigerant Style
0 = Air Handling Unit
B = R-410A Non-Compressorized DX AHU
E = R-410A Variable Capacity Scroll Compressor
A2: Unit Configuration
0 = No Cooling
J = Shell and Tube Water-Cooled Cond. + Std Evap.
Coil
K = Shell and Tube Water-Cooled Cond. + 6 Row
Evap. Coil
R = Brazed Plate Water-Cooled Cond. + Std Evap.
Coil
T = Brazed Plate Water-Cooled Cond. + 6 Row
Evap. Coil
U = Chilled Water Coil - 4 Row
W =Chilled Water Coil - 6 Row
2 = Non-Compressorized + Std Evap. Coil
4 = Non-Compressorized + 6 Row Evap. Coil
8 = Water-Source/Geothermal Heat Pump - Brazed
Plate Heat Exchanger
A3: Coil Coating
0 = Standard
1 = Polymer E-Coated Cooling Coil
D = Stainless Steel Cooling Coil Casing
A4: Cooling / Heat Pump Staging
0 = No Cooling
2 = 2 Stage
4 = 4 Stage
9 = Modulating - Lead Variable Capacity
Compressors
A = Modulating - All Variable Capacity Compressors
H = Single Serpentine 8 fpi
J = Half Serpentine 8 fpi
K = Single Serpentine 10 fpi
L = Half Serpentine 10 fpi
M =Single Serpentine 12 fpi
N = Half Serpentine 12 fpi

SA Series Feature String Nomenclature
GEN
SIZE
VLT
CONFIG
A1
A2
A3
A4
B1
B2
B3
1A
1B
1C
1D
2
3
4
5A
5B
5C
6A
6B
6C
7
8
9
10
11
12
13
14A
14B
15
SA
-
035
-
3
-
A
-
E
R
0
9
-
0
0
0
:
A
C
0
0
-
0
0
0
-
E
B
F
-
A
B
0
-
0
0
0
0
0
0
0
-
H
A
-
0
0
0
0
0
0
0
0
B
16
17
18
19
20
21
22
23
12
B1: Heating Type
0 = No Heating
C = Steam Distributing Standard Coil
D = Steam Distributing Polymer E-Coated Coil
E = Hot Water Standard Coil
F = Hot Water Polymer E-Coated Coil
B2: Heating Designation
0 = No Heating
H = 1 Row Coil
J = 2 Row Coil
B3: Heating Stages
0 = No Heating
H = Single Serpentine 8 fpi
J = Half Serpentine 8 fpi
K = Single Serpentine 10 fpi
L = Half Serpentine 10 fpi
M = Single Serpentine 12 fpi
N = Half Serpentine 12 fpi
1A: Return / Outside Air Section
0 = Standard
A = Waterside Economizer - 4 Row Coil
B = Waterside Economizer - 6 Row Coil
1B: Plenum Height
0 = 33” Plenum Height
A = 37” Plenum Height
B = 41” Plenum Height
C = 45” Plenum Height
D = 49” Plenum Height
E = 53” Plenum Height
F = 57” Plenum Height
G = 37” Plenum Height + Sound Attenuation
H = 41” Plenum Height + Sound Attenuation
J = 45” Plenum Height + Sound Attenuation
K = 49” Plenum Height + Sound Attenuation
L = 53” Plenum Height + Sound Attenuation
M = 57” Plenum Height + Sound Attenuation
1C: Discharge Configuration
0 = Right - Horizontal Discharge
A = Left - Horizontal Discharge
B = Back - Horizontal Discharge
C = Top - Vertical Discharge
D = Options 0 + A
E = Options 0 + B
F = Options 0 + C
G = Options A + B
H = Options A + C
J = Options B + C
K = Options 0 + A + B
L = Options 0 + A + C
M =Options 0 + B + C
N = Options A + B + C
P = Options 0 + A + B + C
1D: Waterside Economizer Circuiting
0 = Standard - None
E = Single Serpentine 12 fpi
2: Blank
0 = Standard
3: Blank
0 = Standard
4: Maintenance Options
0 = Standard
A = Blower Aux. Contact - Low Voltage Terminal
Block
B = Remote Start/Stop Terminals - Low Voltage
Terminal Block
C = Options A + B

SA Series Feature String Nomenclature
GEN
SIZE
VLT
CONFIG
A1
A2
A3
A4
B1
B2
B3
1A
1B
1C
1D
2
3
4
5A
5B
5C
6A
6B
6C
7
8
9
10
11
12
13
14A
14B
15
SA
-
035
-
3
-
A
-
E
R
0
9
-
0
0
0
:
A
C
0
0
-
0
0
0
-
E
B
F
-
A
B
0
-
0
0
0
0
0
0
0
-
H
A
-
0
0
0
0
0
0
0
0
B
16
17
18
19
20
21
22
23
13
5A: Supply Air Blower Configuration
0 = 2 Blowers + Standard Efficiency Motors
A = 4 Blowers + Standard Efficiency Motors
B = 2 Blowers + Premium Efficiency Motors
C = 4 Blowers + Premium Efficiency Motors
E = 2 Blowers + Premium Efficiency Motors + 2
VFDs
G = 4 Blowers + Premium Efficiency Motors + 4
VFDs
H = 1 Blower + Standard Efficiency Motor
J = 1 Blower + Premium Efficiency Motor
K = 1 Blower + Premium Efficiency Motor + 1 VFD
5B: Supply Air Blower
A = 18.5” Spring Isolated Direct Drive Backward
Curved Plenum
B = 22” Spring Isolated Direct Drive Backward
Curved Plenum
5C: Supply Air Blower Motor
C = 1 hp - 1760 rpm
D = 2 hp - 1760 rpm
E = 3 hp - 1760 rpm
F = 5 hp - 1760 rpm
G = 7.5 hp - 1760 rpm
H = 10 hp - 1760 rpm
N = 1 hp - 1170 rpm
P = 2 hp - 1170 rpm
Q = 3 hp - 1170 rpm
R = 5 hp - 1170 rpm
S = 7.5 hp - 1170 rpm
6A: Pre Filter Type
0 = No Pre Filter
A = 2” Pleated - 30% Eff. - MERV 8
6B: Unit Filter Type
0 = 2” Pleated - 30% Eff. - MERV 8
A = 4” Pleated - 30% Eff. - MERV 8
B = 4” Pleated - 65% Eff. - MERV 11
C = 4” Pleated - 85% Eff. - MERV 13
D = 4” Pleated - 95% Eff. - MERV 14
6C: Filter Options
0 = Standard
A = Clogged Filter Switch
B = Magnehelic Gauge
C = Options A + B
7: Refrigeration Control
0 = Standard
C = Freeze Stat - Each Circuit
8: Refrigeration Options
0 = Standard
D = Modulating Hot Gas Reheat
9: Refrigeration Accessories
0 = Standard
A = Sight Glass
B = Compressor Isolation Valves
C = Options A + B
10: Power Options
0 = Standard Power Block
11: Safety Options
0 = Standard
C = Supply Air Smoke Detector
H = Remote Safety Shutdown Terminals
L = Options C + H
12: Controls
0 = Standard
A = Low Limit Controls
B = Phase and Brown Out Protection
C = Options A + B

SA Series Feature String Nomenclature
GEN
SIZE
VLT
CONFIG
A1
A2
A3
A4
B1
B2
B3
1A
1B
1C
1D
2
3
4
5A
5B
5C
6A
6B
6C
7
8
9
10
11
12
13
14A
14B
15
SA
-
035
-
3
-
A
-
E
R
0
9
-
0
0
0
:
A
C
0
0
-
0
0
0
-
E
B
F
-
A
B
0
-
0
0
0
0
0
0
0
-
H
A
-
0
0
0
0
0
0
0
0
B
16
17
18
19
20
21
22
23
14
13: Special Controls
0 = Terminal Block for Thermostat Control
D = VAV Unit Controller - VAV Cool + CV Heat
E = Constant Volume Unit Controller - CV Cool +
CV Heat
F = Makeup Air Unit Controller - CV Cool + CV
Heat
L = Terminal Block for Thermostat Control with
Isolation Relays
Y = VAV Single Zone Heat Pump Unit Controller -
VAV Cool + VAV Heat
Z = Constant Volume Heat Pump Unit Controller -
CV Cool + CV Heat
1 = Makeup Air Heat Pump Unit Controller - CV
Cool + CV Heat
2 = VAV Single Zone Unit Controller - VAV Cool +
CV Heat
4 = Field Installed DDC Controls by Others
5 = Field Installed DDC Controls by Others with
Isolation Relays
6 = Factory Installed DDC Controls Furnished by
Others with Isolation Relays
14A: Water-Cooled Condenser
0 = Standard - None
A = Balancing Valves
B = Water Flow Switch
C = Motorized Shut-Off Valve
D = Head Pressure Control
E = Options A + B
F = Options A + C
G = Options A + D
H = Options B + C
J = Options B + D
L = Options A + B + C
M = Options A + B + D
S = Option A + SMO 254 Corrosion Resistant Brazed
Plate Condenser
T = Option B + SMO 254 Corrosion Resistant Brazed
Plate
U = Option C + SMO 254 Corrosion Resistant
Brazed Plate
V = Option D + SMO 254 Corrosion Resistant
Brazed Plate
W = Option A + B + SMO 254 Corrosion Resistant
Brazed Plate
Y = Option A + C + SMO 254 Corrosion Resistant
Brazed Plate
Z = Option A + D + SMO 254 Corrosion Resistant
Brazed Plate
1 = Option B + C + SMO 254 Corrosion Resistant
Brazed Plate
2 = Option B + D + SMO 254 Corrosion Resistant
Brazed Plate
4 = Option A + B + C + SMO 254 Corrosion
Resistant Brazed Plate
5 = Option A + B + D + SMO 254 Corrosion
Resistant Brazed Plate

SA Series Feature String Nomenclature
GEN
SIZE
VLT
CONFIG
A1
A2
A3
A4
B1
B2
B3
1A
1B
1C
1D
2
3
4
5A
5B
5C
6A
6B
6C
7
8
9
10
11
12
13
14A
14B
15
SA
-
035
-
3
-
A
-
E
R
0
9
-
0
0
0
:
A
C
0
0
-
0
0
0
-
E
B
F
-
A
B
0
-
0
0
0
0
0
0
0
-
H
A
-
0
0
0
0
0
0
0
0
B
16
17
18
19
20
21
22
23
15
14B: Waterside Economizer Piping
0 = Standard - None
A = Variable Water Flow Application Field Piped
Waterside Economizer
B = Constant Water Flow Application Field Piped
Waterside Economizer
C = Variable Water Flow Application Factory Piped
Waterside Economizer
D = Constant Water Flow Application Factory Piped
Waterside Economizer
15: Glycol Percentage
0 = Standard
A = Minimum 20% Propylene Glycol
B = Minimum 40% Propylene Glycol
C = Field Adjustable for Glycol %
16: Interior Cabinet Options
0 = Standard
A = Overflow Switch
B = UV Lights
C = Options A + B
17: Blank
0 = Standard
18: Blank
0 = Standard
19: Code Options
0 = Standard - ETL U.S.A. Listing
D = Chicago - Cool Only
G = Chicago - No Cool + No Heat
20: Crating
0 = Standard
A = Export Crating
B = Forkliftable Base
C = Shipping Shrink Wrap
D = Options A + B
E = Options A + C
F = Options B + C
G = Options A + B + C
21: Shipping Splits
0 = Standard - One Piece Unit
A = Two Piece Single Unit - 1 Blower Plenum + 1
Air Tunnel
B = Two Piece Double Unit - 1 Blower Plenum + 1
Air Tunnel
C = Three Piece Double Unit - 1 Blower Plenum + 2
Air Tunnels
D = Four Piece Double Unit - 2 Blower Plenums + 2
Air Tunnels
22: Control Vendors
0 = Standard
A = WattMaster Orion Controls System
C = WattMaster Orion Controls System with Specials
23: Type
B = Standard Paint
U = Special Pricing Authorization + Special Paint
X = Special Pricing Authorization + AAON Gray
Paint

16
General Information
SA Series self contained units and indoor air
handling units have been designed for
indoor installation only. SA Series units can
contain spring isolated direct drive
backward curved plenum fans, shell and
tube or brazed plate water-cooled
condensers, R-410A scroll compressors,
evaporator coils, chilled water cooling coils,
steam or hot water heating coils, waterside
economizers, and a single point power
connection. Units are assembled, wired,
charged and run-tested at the factory. SA
Series units are not intended for residential
use.
Codes and Ordinances
SA Series units have been tested and
certified, by ETL, in accordance with UL
Safety Standard 1995/CSA C22.2 No. 236.
System should be sized in accordance with
the American Society of Heating,
Refrigeration and Air Conditioning
Engineers Handbook.
Installation of units must conform to the
ICC standards of the International
Mechanical Code, the International Building
Code, Installation of Air Conditioning and
Ventilating Systems Standard, NFPA 90A,
and local building, plumbing and waste
water codes. All appliances must be
electrically grounded in accordance with
local codes, or in the absence of local codes,
the current National Electric Code,
ANSI/NFPA 70 or the current Canadian
Electrical Code CSA C22.1.
Receiving Unit
When received, the unit should be checked
for damage that might have occurred in
transit. If damage is found it should be noted
on the carrier’s Freight Bill. A request for
inspection by carrier’s agent should be made
in writing at once.
Nameplate should be checked to ensure the
correct model sizes and voltages have been
received to match the job requirements.
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.
WARNING
The Clean Air Act of 1990 bans the
intentional venting of refrigerant as of
July 1, 1992. Approved methods of
recovery, recycling, or reclaiming
must be followed.
CAUTION
Coils and sheet metal surfaces
present sharp edges and care must
be taken when working with
equipment.
WARNING
Failure to observe the following
instructions will result in premature
failure of your system and possible
voiding of the warranty.
WARNING

17
Storage
If installation will not occur immediately
following delivery, store equipment in a dry
protected area away from construction
traffic and in the proper orientation as
marked on the packaging with all internal
packaging in place. Secure all loose-shipped
items.
Direct Expansion (DX) Systems
All water-cooled condenser DX systems are
factory assembled, leak tested, charged with
R-410A refrigerant, and run tested.
All DX systems include evaporator coils,
liquid line filter dryers, thermostatic
expansion valves (TXV), and scroll
compressors.
Never turn 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
may 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 emergency or complete
shutdown of the unit.
During the cooling season, if the airflow 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
CRANKCASE HEATER
Some units are equipped with
compressor crankcase heaters,
which should be energized at least
24 hours prior to cooling operation, to
clear any liquid refrigerant from the
compressors.
CAUTION
COMPRESSOR CYCLING
5 MINUTE MINIMUM OFF TIME
To prevent motor overheating
compressors must cycle off for a
minimum of 5 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 6
starts per hour.
WARNING

18
the compressor, leaving it starved for
lubrication.
The compressor life will be seriously
shortened by reduced lubrication and the
pumping of excessive amounts of liquid oil
and refrigerant.
Wiring Diagrams
Unit specific wiring diagrams are laminated
and affixed inside the controls compartment
door.
Condensate Drain Pans
Units require drain p-traps and lines to be
connected to the condensate drain pans of
the unit. The lines should be the same pipe
size or larger than the drain connection,
include a p-trap, and pitch downward toward
drain. An air break should be used with long
runs of condensate lines.
Waterside economizer coil units include a
separate condensate drain pan which drains
into the evaporator coil drain pan. No
additional drain line is needed for the
waterside economizer drain pan.
Unit Size
Units are modular and composed of
combination of the four standard unit sizes,
SA-023, SA-028, SA-030, and SA-035.
Table 1 - SA Series Models
Model
Cabinet Type
Intake
Cabinet 1
Cabinet 2
SA-023
Single
Left or Right
Side
SA-023
SA-028
SA-028
SA-030
SA-030
SA-035
SA-035
SA-045
Dual
Left and Right
Sides
SA-023
SA-023
SA-050
SA-023
SA-028
SA-055
SA-028
SA-028
SA-058
SA-028
SA-030
SA-060
SA-030
SA-030
SA-065
SA-030
SA-035
SA-070
SA-035
SA-035
Unit should not be operated without a
p-trap. Failure to install a p-trap may
result in overflow of condensate
water.
CAUTION

19
Installation
Locating the Unit
Placement of the unit relative to ductwork,
electrical and plumbing must be carefully
considered. Return air plenum or duct can be
mounted directly to the return air flanges.
Use flexible gasket material to seal the duct
to the unit.
Verify floor or foundation can support the
total unit weight, including accessory
weights. Unit must be level in both
horizontal axes to support the unit and
reduce noise and vibration from the unit.
Allow adequate service clearances as shown
on the unit nameplate and unit drawing.
Consult your local building codes for
additional service clearance requirements.
Allow adequate space for piping access and
panel removal. Condenser water piping and
condensate drain connections are near the
bottom on the back of the unit.
Figure 1 - SA Series Unit with Right Intake
Lifting and Handling the Unit
Before lifting unit, be sure that all shipping
material has been removed from unit.
If cables or chains are used to hoist the unit
care should be taken to prevent damage to
the cabinet.
Secure hooks and cables at the all lift points
provided near the fan section at the top of
the unit.
UNIT HANDLING
Incorrect lifting can cause damage to
the unit, injury or death. Lifting
equipment capacity should 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.
WARNING

20
Figure 2 - One Piece Single Unit Lifting Details