AAON LZ Series Owner's manual

LZ Series
Chillers and Outdoor Mechanical Rooms
Installation, Operation,
& Maintenance
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 should be kept with
the unit.
Do not store gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.
WHAT 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 you 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.
Startup and service must be
performed by a Factory Trained
Service Technician.
WARNING
WARNING

Table of Contents
Codes and Ordinances............................................................................................................... 19
Receiving Unit........................................................................................................................... 19
Storage....................................................................................................................................... 20
Outdoor Mechanical Room....................................................................................................... 20
Wiring Diagrams....................................................................................................................... 21
General Maintenance................................................................................................................. 21
Chiller Primary Pumping .......................................................................................................... 21
Chiller Primary/Secondary Pumping ........................................................................................ 22
Condensing Boilers ................................................................................................................... 22
Makeup Water........................................................................................................................... 23
Compression Tank..................................................................................................................... 23
Pressure Relief Valve................................................................................................................ 24
Automatic Air Vent................................................................................................................... 24
Dual Pumps ............................................................................................................................... 24
Pressure Gauges and Thermometers ......................................................................................... 24
Pipe Insulation........................................................................................................................... 25
Outdoor Mechanical Room Placement...................................................................................... 25
Curb and Steel Mount Installation ............................................................................................ 25
Lifting and Handling................................................................................................................. 28
Vestibule Exhaust Fan............................................................................................................... 29
Water Connection...................................................................................................................... 30
Temporary Drain –Evaporative Condenser.............................................................................. 31
Access Doors............................................................................................................................. 31
End Flashing Installation........................................................................................................... 31
Boiler Gas Connection .............................................................................................................. 32
Boiler Air Intake / Vent Piping ................................................................................................. 32
Sidewall Direct Boiler Venting................................................................................................. 35
Vertical Direct Boiler Venting.................................................................................................. 37
Boiler Condensate Drain........................................................................................................... 41
Split Unit Assembly.................................................................................................................. 41
Unit Mounting Isolation............................................................................................................ 41
Low Ambient Operation............................................................................................................ 41
Electrical.................................................................................................................................... 42
Variable Speed Compressors .................................................................................................... 44
Condenser Fan Pitch Adjustment.............................................................................................. 47
Boiler System Startup................................................................................................................ 50
Boiler Sequence of Operations.................................................................................................. 51
General ...................................................................................................................................... 51
Refrigerant Suction Line Filter ................................................................................................. 51
Suction Filter Removal Instructions.......................................................................................... 52
Refrigerant Liquid Line Filter Driers........................................................................................ 52
Evaporator/Heat Exchangers..................................................................................................... 53
Adjusting Refrigerant Charge ................................................................................................... 53
Lubrication ................................................................................................................................ 57

4
Air-Cooled Condenser............................................................................................................... 57
E-Coated Coil Cleaning ............................................................................................................ 57
Microchannel Coil Cleaning ..................................................................................................... 59
Evaporative-Condensed Chiller ................................................................................................ 61
Severe Operating Conditions Service.................................................................................... 62
Safety..................................................................................................................................... 62
Performance........................................................................................................................... 62
Warranties.............................................................................................................................. 63
Condenser Tube Inspection ................................................................................................... 63
Freeze Protection ................................................................................................................... 63
Recirculating Water System .................................................................................................. 63
Startup.................................................................................................................................... 63
Cleanliness............................................................................................................................. 63
Storage................................................................................................................................... 63
Pump Operation..................................................................................................................... 64
Running.................................................................................................................................. 64
Condenser Fan Motors........................................................................................................... 64
Water Make Up Valve........................................................................................................... 64
Water Treatment System ....................................................................................................... 65
Sequence of Operation for LZ Series units without Diagnostics .......................................... 65
Sequence of Operation for LZ Series units with Diagnostics................................................ 66
Pump Maintenance ................................................................................................................ 67
Fan Motor Maintenance......................................................................................................... 67
Access Doors ......................................................................................................................... 67
Bearings - Lubrication........................................................................................................... 68
Recommended Monthly Inspection....................................................................................... 68
Mist Eliminators .................................................................................................................... 68
Air Inlet.................................................................................................................................. 68
Stainless Steel Base Pan ........................................................................................................ 68
Propeller Fans and Motors..................................................................................................... 68
Recommended Annual Inspection......................................................................................... 68
Cleaning................................................................................................................................. 68
Water Quality......................................................................................................................... 69
Mechanical Cleaning............................................................................................................. 70
Service....................................................................................................................................... 70
Replacement Parts..................................................................................................................... 70
Water Pressure Reducing Valve................................................................................................ 71
Water Pressure Relief Valve ..................................................................................................... 73
Automatic Air Vent Valves....................................................................................................... 73
Pumps - Installation and Operating Instructions....................................................................... 75
Pump Piping - General.............................................................................................................. 77
Pump Operation......................................................................................................................... 77
General Care.............................................................................................................................. 78
Dual Pump Specific Information............................................................................................... 80
Horizontal and Vertical Expansion Tanks ................................................................................ 85
Suction Guides .......................................................................................................................... 86

5
Glycol Auto Fill Unit ................................................................................................................ 87
Flo-Trex Combination Valve .................................................................................................... 89
Index of Tables and Figures
Tables:
Table 1 - Service Clearances......................................................................................................... 25
Table 2 - Unit Gas Pipe Information, Feature B4 = A-J............................................................... 33
Table 3 - Unit Gas Pipe Information, Feature B4 = K-N.............................................................. 34
Table 4 - Nameplate Voltage Markings........................................................................................ 42
Table 5- Tandem Circuited Variable Speed Compressor VFD Frequency Range....................... 44
Table 6 - Air-Cooled Condenser Fan Pitch................................................................................... 47
Table 7 - Evaporative-Condensed Chiller Fan Pitch .................................................................... 47
Table 8 - Condenser Fan Pin Location (Bushing Mount)............................................................. 49
Table 9 - Condenser Fan Pin Location (Rotation Direction)........................................................ 49
Table 10 - Fan Assembly Bushing Torque Specifications............................................................ 50
Table 11 - Filter Drier Maximum Pressure Drop.......................................................................... 52
Table 12 - Acceptable Refrigeration Circuit Values..................................................................... 54
Table 13 - R-134a Refrigerant Temperature-Pressure Chart........................................................ 55
Table 14 - R-410A Refrigerant Temperature-Pressure Chart....................................................... 56
Table 15 - Recirculating Water Quality Guidelines ..................................................................... 69
Figures:
Figure 1 - Backflow Preventer...................................................................................................... 23
Figure 2 - Pressure Relief Valve................................................................................................... 24
Figure 3 - Curb Mounting with Dimensions................................................................................. 26
Figure 4 - Curb End Detail............................................................................................................ 26
Figure 5 - Steel Mounting Rail with Dimensions......................................................................... 26
Figure 6 - Concrete Pad Mounting with Dimensions ................................................................... 27
Figure 7 - LZ Base........................................................................................................................ 27
Figure 8 - Lifting Points................................................................................................................ 28
Figure 9 - LZ Series Example Lifting Detail................................................................................ 29
Figure 10 - Vestibule Exhaust Fan................................................................................................ 29
Figure 11 - Water Pipe Flashing Installation................................................................................ 30
Figure 12 –Temporary Drain Components.................................................................................. 31
Figure 13 - Factory Supplied End Flashings................................................................................. 31
Figure 14 - Sidewall Vent Shipping Cover Removal ................................................................... 35
Figure 15 - Sidewall Vent Plate Installation................................................................................. 35
Figure 16 - Typical Air Intake Piping........................................................................................... 35
Figure 17 - Typical Flue Vent Piping........................................................................................... 36
Figure 18 - Sidewall Vent Base .................................................................................................... 37
Figure 19 - Sidewall Vent Cap...................................................................................................... 37
Figure 20 - Roof Air Intake and Vent Piping Shipping Covers.................................................... 37
Figure 21 - Typical Vertical Air Intake Piping............................................................................. 38

6
Figure 22 - Correct Joint Connection............................................................................................ 39
Figure 23 - Incorrect Joint Connection......................................................................................... 39
Figure 24 - Typical Vertical Vent Piping ..................................................................................... 40
Figure 25 - Vertical Termination of Air Intake and Vent Piping ................................................. 40
Figure 26 - Evaporative-Condensed Chiller Section Layout........................................................ 45
Figure 27 - Fan with the HUB on the top and RET on the bottom............................................... 48
Figure 28 - Bushing Mount Location............................................................................................ 48
Figure 29 - RET with Pin in Groove 4.......................................................................................... 48
Figure 30 - Fan HUB and RET Castings...................................................................................... 48
Figure 31 - Pitch Insert ................................................................................................................. 49
Figure 32 - Replaceable Core Filter Driers................................................................................... 52
Figure 33 - Proper Unit Location.................................................................................................. 62
Figure 34 - Improper Unit Locations............................................................................................ 62
Figure 35 - Water Makeup Valve ................................................................................................. 65
Figure 36 –Evaporative condenser access door........................................................................... 67
V45100 · Rev. A · 190515

7
AAON LZ Series Features and Options Introduction
Energy Efficiency
•Staged or Variable Speed R-410A Scroll
Compressors
•Oil-Free Magnetic Bearing R-134a
Turbocor Centrifugal Compressors
•High Efficiency Air-Cooled
Microchannel Condenser Coils
•AAON Evaporative-Condensed Chiller
•VFD Controlled Pumping Packages
•VFD Controlled Condenser Fan Head
Pressure Control
•ECM Low Sound Condenser Fan Head
Pressure Control
•98% Thermal Efficiency Boilers
•Waterside Economizers
•Factory Installed EXVs
Outdoor Mechanical Room
•Chilled Water Applications up to
540 tons
•Hot Water Applications up to
6,000 MBH
•Lighted Walk-In Service Vestibule
•Factory Engineered Primary or
Primary/Secondary Pumping Packages
•Factory Installed Three Chemical Water
Treatment
•Factory Installed Compression Tank
•Brazed Plate or Shell and Tube
Evaporators
•Factory Installed Option Boxes for Field
Installed Accessories
Safety
•Phase and Brownout Protection
•Single Point Non-Fused Disconnect
Power Switch
•Factory Installed Refrigerant Leak
Detector
•Water Piping Air Separator
•Waterside Thermometer and Pressure
Gauge
Installation and Maintenance
•Double Wall Rigid Polyurethane Foam
Injected Panel Construction
•Lighted Walk-In Service Vestibule
•Access Doors with Full Length Stainless
Steel Piano Hinges
•Zinc Cast Lockable Handles
•Factory Installed Convenience Outlet
•Service Vestibule Heating and Cooling
•Motorized Service Vestibule Fresh Air
•Controls Diagnostics
•Touchscreen Computer Controls
Interface
•Evaporative-Condensed Chiller De-
Superheater
•Evaporative-Condensed Chiller Sump
Heaters
•Liquid Line Sight Glass
•Compressor Isolation Valves
•Auto Glycol Feeder
•Color-Coded Wiring Diagrams
System Integration
•Complete System with AAON Chilled
Water Air Handling Units
•BMS Connectivity
•Grooved End Water Piping Connections
•Custom Color Paint Options
Environmentally Friendly
•R-410A or R-134a Refrigerant
Extended Life
•Optional 5 Year Compressor Warranty
•Condenser Coil Guards
•2,500 Hour Salt Spray Tested Exterior
Corrosion Protection
•10,000 Hour Salt Spray Tested Polymer
E-Coated Condenser Coils
•

8
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
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
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

9
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
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
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
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
motors FLA rating as shown on the
motor nameplate.
CAUTION

10
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
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
Door compartments containing
hazardous voltage or rotating parts
are equipped with door latches to
allow locks. Door latches 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
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
PVC (Polyvinyl Chloride) and CPVC
(Chlorinated Polyvinyl Chloride) are
vulnerable to attack by certain
chemicals. Polyolester (POE) oils that
are used in R-410A and other
refrigerant systems will cause stress
cracking of PVC or CPVC piping, even
if only present in trace amounts. This
will result in complete piping system
failure.
CAUTION
COMPRESSOR CYCLING
3 MINUTE MINIMUM OFF TIME
To prevent motor overheating
compressors must cycle off for a
minimum of 3 minutes.
3 MINUTE MINIMUM ON TIME
To maintain the proper oil level
compressors must cycle on for a
minimum of 3 minutes.
The cycle rate must not exceed 6
starts per hour.
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

11
1. Startup and service must be performed by
a Factory Trained Service Technician.
2. The unit is for outdoor use only. See
General Information section for more
information.
3. Use only with type of the gas approved
for the boiler. Refer to the boiler rating
plate.
4. Provide adequate combustion ventilation
air to the boiler.
5. Every unit has a unique equipment
nameplate with electrical, operational,
and unit clearance specifications. Always
refer to the unit nameplate for ratings
unique to the model you have purchased.
6. READ THE ENTIRE INSTALLATION,
OPERATION AND MAINTENANCE
MANUAL. OTHER IMPORTANT
SAFETY PRECAUTIONS ARE
PROVIDED THROUGHOUT THIS
MANUAL.
7. Keep this manual and all literature
safeguarded near or on the unit.
Polyolester (POE) and Polyvinylether
(PVE) oils are two types of lubricants
used with R-410A and R134a
refrigeration systems. Refer to the
compressor label for the proper
compressor lubricant type.
CAUTION
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
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
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

LZ Series Feature String Nomenclature
Model Options
:
Unit Feature Options
GEN
MJREV
SIZE
SERIES
MNREV
VLT
A1
A2
A3
A4
A5
B1
B2
B3
B4
1
2
3A
3B
3C
3D
4A
4B
4C
4D
5A
5B
5C
5D
6
7
8A
8B
8C
LZ
A
-
140
-
C
-
A
-
3
-
F
A
C
0
E
-
0
0
0
0
:
E
0
-
0
0
0
0
-
0
0
0
0
-
0
0
0
0
-
0
0
-
0
0
0
0
-
0
E
0
0
-
0
0
C
0
0
-
0
J
0
0
0
-
0
0
0
0
0
-
0
0
0
0
0
0
-
0
0
0
0
0
-
0
0
D
B
9
10A
10B
10C
10D
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26A
26B
26C
26D
26E
26F
27
28
29
30
31
32
33
34
35
12
LZ Series Feature S tring Nomenc lature
MODEL OPTIONS
Series and Generation
LZ
Major Revision
A
Unit Size
Air-Cooled
Evaporative-Condensed
045 = 45 ton Capacity
053 = 53 ton Capacity
055 = 55 ton Capacity
061 = 61 ton Capacity
060 = 60 ton Capacity
069 = 69 ton Capacity
075 = 75 ton Capacity
078 = 78 ton Capacity
090 = 90 ton Capacity
090 = 90 ton Capacity
095 = 95 ton Capacity
106 = 106 ton Capacity
105 = 105 ton Capacity
120 = 120 ton Capacity
120 = 120 ton Capacity
121 = 121 ton Capacity
140 = 140 ton Capacity
134 = 134 ton Capacity
170 = 170 ton Capacity
150 = 150 ton Capacity
181 = 181 ton Capacity
161 = 161 ton Capacity
200 = 200 ton Capacity
180 = 180 ton Capacity
181 = 181 ton Capacity
193 = 193 ton Capacity
239 = 239 ton Capacity
240 = 240 ton Capacity
274 = 274 ton Capacity
300 = 300 ton Capacity
319 = 319 ton Capacity
356 = 356 ton Capacity
360 = 360 ton Capacity
401 = 401 ton Capacity
441 = 441 ton Capacity
450 = 450 ton Capacity
478 = 478 ton Capacity
540 = 540 ton Capacity
Series - Scroll Compressor
Air-Cooled
A = 45-60 ton units
B = 75 ton unit
C = 95-140 ton units
D = 170-200 ton units
Evaporative-Condensed
A = 53-69 ton units
B = 78 ton unit
C = 106-161 ton units
D = 193-239 ton units
E = 274-319 ton units
F = 356-401 ton units
G = 441-478 ton units
Series - Turbocor Compressor
Air-Cooled
H = 90-120 ton units
K = 181 ton unit
Evaporative-Condensed
H = 90 & 120 ton units
J = 150 & 180 ton units
K = 181 ton unit
L = 240 ton unit
M = 300 & 360 ton units
N = 450 & 540 ton units
Minor Revision
A
Voltage
2 = 230V/3Φ/60Hz
3 = 460V/3Φ/60Hz
4 = 575V/3Φ/60Hz
8 = 208V/3Φ/60Hz
A1: Compressor Style
F = R-410A Tandem VFD Compatible Scroll
Compressor
H = R-134a Turbocor Centrifugal Compressor
J = R-134a Turbocor Centrifugal Compressor with
Economizer
A2: Condenser Style
A = Air-Cooled Microchannel Condenser
H = Evaporative-Condensed
A3: Evaporator Configuration
A = Brazed Plate
B = Oversized Brazed Plate
C = Shell & Tube
D = Oversized Shell & Tube
A4: Coating
0 = Standard
E = Polymer E-Coated Condenser Coil
A5: Staging
0 = Staged On/Off Compressors
E = All Circuits Variable Capacity Compressors
G = Half Circuits Variable Capacity Compressors

LZ Series Feature String Nomenclature
Model Options
:
Unit Feature Options
GEN
MJREV
SIZE
SERIES
MNREV
VLT
A1
A2
A3
A4
A5
B1
B2
B3
B4
1
2
3A
3B
3C
3D
4A
4B
4C
4D
5A
5B
5C
5D
6
7
8A
8B
8C
LZ
A
-
140
-
C
-
A
-
3
-
F
A
C
0
E
-
0
0
0
0
:
E
0
-
0
0
0
0
-
0
0
0
0
-
0
0
0
0
-
0
0
-
0
0
0
0
-
0
E
0
0
-
0
0
C
0
0
-
0
J
0
0
0
-
0
0
0
0
0
-
0
0
0
0
0
0
-
0
0
0
0
0
-
0
0
D
B
9
10A
10B
10C
10D
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26A
26B
26C
26D
26E
26F
27
28
29
30
31
32
33
34
35
13
B1: Type
0 = No Boilers
B2: Boiler Quantity
0 = No Boilers
B3: Type and Pipe Size
0 = No Boilers
B4: Boiler Capacity
0 = No Boilers
UNIT FEATURE OPTIONS
1: Unit Orientation
E = Walk-in Vestibule Left Access Left Water
Connections
F = Walk-in Vestibule Left Access Right Water
Connections
G = Walk-in Vestibule Left Access Bottom Water
Connections
J = Walk-in Vestibule Right Access Left Water
Connections
K = Walk-in Vestibule Right Access Right Water
Connections
L = Walk-in Vestibule Right Access Bottom Water
Connections
2: Pumping Style
0 = No Pumps
A = Const. Primary Pumping System Small Pipe Size
B = Const. Primary Pumping System Large Pipe Size
C = Var. Primary Pumping System Small Pipe Size
D = Var. Primary Pumping System Large Pipe Size
E = Primary/Secondary Pumping System Small Pipe
Size
F = Primary/Secondary Pumping System Large Pipe
Size
3A: Building Pump Configuration
0 = No Building Pumps
A = 1 Pump + High Eff Motor
B = 1 Dual Pump + High Eff Motors
C = 2 Single Pumps + High Eff Motors
D = 1 Pump + VFD + High Eff Motor
E = 1 Dual Pump + 2 VFD's + High Eff Motors
F = 2 Single Pumps + 2 VFD’s + High Eff Motors
K = 1 Pump + Field Installed VFD + High Eff Motor
L = 1 Dual Pump + 2 Field Installed VFD's + High
Eff Motors
M = 2 Single Pumps + 2 Field Installed VFD’s +
High Eff Motors
3B: Building Pump Series and RPM
0 = No Building Pumps
A = 4360 (1,170 nominal rpm)
B = 4360 (1,760 nominal rpm)
C = 4360 (3,520 nominal rpm)
D = 4380 (1,170 nominal rpm)
E = 4380 (1,760 nominal rpm)
F = 4380 (3,520 nominal rpm)
G = 4300 (1,170 nominal rpm)
H = 4300 (1,760 nominal rpm)
J = 4300 (3,520 nominal rpm)
K = 4382 (1,170 nominal rpm)
L = 4382 (1,760 nominal rpm)
M = 4382 (3,520 nominal rpm)
N = 4302 (1,170 nominal rpm)
P = 4302 (1,760 nominal rpm)
Q = 4302 (3,520 nominal rpm)

LZ Series Feature String Nomenclature
Model Options
:
Unit Feature Options
GEN
MJREV
SIZE
SERIES
MNREV
VLT
A1
A2
A3
A4
A5
B1
B2
B3
B4
1
2
3A
3B
3C
3D
4A
4B
4C
4D
5A
5B
5C
5D
6
7
8A
8B
8C
LZ
A
-
140
-
C
-
A
-
3
-
F
A
C
0
E
-
0
0
0
0
:
E
0
-
0
0
0
0
-
0
0
0
0
-
0
0
0
0
-
0
0
-
0
0
0
0
-
0
E
0
0
-
0
0
C
0
0
-
0
J
0
0
0
-
0
0
0
0
0
-
0
0
0
0
0
0
-
0
0
0
0
0
-
0
0
D
B
9
10A
10B
10C
10D
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26A
26B
26C
26D
26E
26F
27
28
29
30
31
32
33
34
35
14
3C: Pump Size
0 = No Building Pumps
A = 1.5B
B = 2B
C = 2D
D = 3D
E = 1.5x1.5x6
F = 2x2x6
G = 3x3x6
H = 4x4x6
J = 6x6x6
K = 1.5x1.5x8
L = 2x2x8
M = 3x3x8
N = 4x4x8
P = 5x5x8
Q = 6x6x8
R = 8x8x8
S = 2x2x10
T = 3x3x10
U = 4x4x10
V = 6x6x10
W = 8x8x10
Y = 4x4x11.5
Z = 5x5x11.5
1 = 6x6x11.5
2 = 8x8x11.5
3 = 4x4x13
4 = 6x6x13
5 = 8x8x13
3D: Building Pump Motor Size
0 = No Building Pumps
A = 0.5 hp
B = 0.75 hp
C = 1 hp
D = 1.5 hp
E = 2 hp
F = 3 hp
G = 5 hp
H = 7.5 hp
J = 10 hp
K = 15 hp
L = 20 hp
M = 25 hp
3D: Building Pump Motor Size Continued
N = 30 hp
P = 40 hp
Q = 50 hp
R = 60 hp
S = 75 hp
4A: Recirculating Pump Configuration
0 = No Recirculating Pumps
A = 1 Pump + High Eff Motor
B = 1 Dual Pump + High Eff Motors
C = 2 Single Pumps + High Eff Motors
4B: Recirculation Pump Series & RPM
0 = No Recirculating Pumps
A = 4360 (1,170 nominal rpm)
B = 4360 (1,760 nominal rpm)
C = 4360 (3,520 nominal rpm)
D = 4380 (1,170 nominal rpm)
E = 4380 (1,760 nominal rpm)
F = 4380 (3,520 nominal rpm)
G = 4300 (1,170 nominal rpm)
H = 4300 (1,760 nominal rpm)
J = 4300 (3,520 nominal rpm)
K = 4382 (1,170 nominal rpm)
L = 4382 (1,760 nominal rpm)
M = 4382 (3,520 nominal rpm)
N = 4302 (1,170 nominal rpm)
P = 4302 (1,760 nominal rpm)
Q = 4302 (3,520 nominal rpm)

LZ Series Feature String Nomenclature
Model Options
:
Unit Feature Options
GEN
MJREV
SIZE
SERIES
MNREV
VLT
A1
A2
A3
A4
A5
B1
B2
B3
B4
1
2
3A
3B
3C
3D
4A
4B
4C
4D
5A
5B
5C
5D
6
7
8A
8B
8C
LZ
A
-
140
-
C
-
A
-
3
-
F
A
C
0
E
-
0
0
0
0
:
E
0
-
0
0
0
0
-
0
0
0
0
-
0
0
0
0
-
0
0
-
0
0
0
0
-
0
E
0
0
-
0
0
C
0
0
-
0
J
0
0
0
-
0
0
0
0
0
-
0
0
0
0
0
0
-
0
0
0
0
0
-
0
0
D
B
9
10A
10B
10C
10D
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26A
26B
26C
26D
26E
26F
27
28
29
30
31
32
33
34
35
15
4C: Recirculating Pump Size
0 = No Recirculating Pumps
A = 1.5B
B = 2B
C = 2D
D = 3D
E = 1.5x1.5x6
F = 2x2x6
G = 3x3x6
H = 4x4x6
J = 6x6x6
K = 1.5x1.5x8
L = 2x2x8
M = 3x3x8
N = 4x4x8
P = 5x5x8
Q = 6x6x8
R = 8x8x8
S = 2x2x10
T = 3x3x10
U = 4x4x10
V = 6x6x10
W = 8x8x10
Y = 4x4x11.5
Z = 5x5x11.5
1 = 6x6x11.5
2 = 8x8x11.5
3 = 4x4x13
4 = 6x6x13
5 = 8x8x13
4D: Recirculating Pump Motor Size
0 = No Recirculating Pumps
A = 0.5 hp
B = 0.75 hp
C = 1 hp
D = 1.5 hp
E = 2 hp
F = 3 hp
G = 5 hp
H = 7.5 hp
J = 10 hp
K = 15 hp
L = 20 hp
M = 25 hp
4D: Recirculating Pump Motor Size Continued
N = 30 hp
P = 40 hp
Q = 50 hp
R = 60 hp
S = 75 hp
5A: Boiler Building Pump Configuration
0 = No Boiler Pumps
5B: Boiler Building Pump Series & RPM
0 = No Boiler Pumps
5C: Boiler Building Pump Size
0 = No Boiler Pumps
5D: Boiler Building Pump Motor Size
0 = No Boiler Pumps
6: Refrigeration Options
0 = None
A = Hot gas bypass on non-variable capacity
compressor circuits
B = Hot gas bypass on all circuits
7: Refrigeration Accessories
0 = Standard
A = Sight Glass
B = Compressor Isolation Valves
C = Option A + B
8A: Unit Disconnect Type
0 = Standard Single Point Power Block
A = Single Point Power Non-fused Disconnect
8B: Disconnect 1 Size
0 = Power Block
N = 100 amps
R = 150 amps
U = 225 amps
V = 250 amps
Z = 400 amps
3 = 600 amps
5 = 800 amps
7 = 1200 amps

LZ Series Feature String Nomenclature
Model Options
:
Unit Feature Options
GEN
MJREV
SIZE
SERIES
MNREV
VLT
A1
A2
A3
A4
A5
B1
B2
B3
B4
1
2
3A
3B
3C
3D
4A
4B
4C
4D
5A
5B
5C
5D
6
7
8A
8B
8C
LZ
A
-
140
-
C
-
A
-
3
-
F
A
C
0
E
-
0
0
0
0
:
E
0
-
0
0
0
0
-
0
0
0
0
-
0
0
0
0
-
0
0
-
0
0
0
0
-
0
E
0
0
-
0
0
C
0
0
-
0
J
0
0
0
-
0
0
0
0
0
-
0
0
0
0
0
0
-
0
0
0
0
0
-
0
0
D
B
9
10A
10B
10C
10D
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26A
26B
26C
26D
26E
26F
27
28
29
30
31
32
33
34
35
16
8C: Blank
0 = Standard
9: Accessories
0 = None
B = Phase & Brown Out Protection
10A: Unit Control Sequence
0 = Standard AAON Controls
10B: Unit Control Supplier
E = MCS Controls
10C: Control Supplier Options
0 = None
A = Touchscreen Computer Interface
C = Modem
G = Option A + C
10D: BMS Connection & Diagnostics
0 = None
A = BACnet IP
B = BACnet MSTP
C = Modbus IP
D = Modbus RTU
E = LonTalk
H = No BMS Connection with Diagnostics
J = BACnet IP with Diagnostics
K = BACnet MSTP with Diagnostics
L = Modbus IP with Diagnostics
M = Modbus RTU with Diagnostics
N = LonTalk with Diagnostics
11: Cabinet Options
0 = None
B = Access Door Windows
12: Vestibule Accessories
0 = None
A = Refrigerant Leak Detector
B = Motorized Service Vestibule Fresh Air
C = Vestibule Heating (Electric)
D = Vestibule Cooling (Fan/Coil)
F = Option A + B
G = Option A + C
12: Vestibule Accessories Continued
H = Option A + D
K = Option B + C
L = Option B + D
N = Option C + D
R = Option A + B + C
S = Option A + B + D
U = Option A + C + D
Y = Option B + C + D
3 = Option A + B + C + D
13: Maintenance Accessories
0 = None
A = 115VAC Convenience Outlet Factory Wired
B = 115VAC Convenience Outlet Field Wired
C = Service Lights
F = Option A + C
J = Option B + C
14: Option Boxes
0 = None
A = 2 ft Option Box
B = 4 ft Option Box
C = 6 ft Option Box
D = 8 ft Option Box
F = 10 ft Option Box
G = 12 ft Option Box
15: Code Options
0 = Standard ETL U.S.A. Listing
A = Chicago Code
B = ETL U.S.A. + Canada Listing
16: Shipping Splits
0 = One Piece Unit
A = Two Piece Unit
17: Air-Cooled Condenser Accessories
0 = None (No Air-Cooled Condenser)
H = Cond Coil Guards + 3ΦCondenser Fan Motor +
Fan Cycling (35°F)
J = Cond Coil Guards + 3ΦCondenser Fan Motor +
VFD Condenser Fan Head Pressure Control (0°F)
S = Cond. Coil Guards + Low Sound ECM Cond.
Fans –Head Pressure Control (0°F)

LZ Series Feature String Nomenclature
Model Options
:
Unit Feature Options
GEN
MJREV
SIZE
SERIES
MNREV
VLT
A1
A2
A3
A4
A5
B1
B2
B3
B4
1
2
3A
3B
3C
3D
4A
4B
4C
4D
5A
5B
5C
5D
6
7
8A
8B
8C
LZ
A
-
140
-
C
-
A
-
3
-
F
A
C
0
E
-
0
0
0
0
:
E
0
-
0
0
0
0
-
0
0
0
0
-
0
0
0
0
-
0
0
-
0
0
0
0
-
0
E
0
0
-
0
0
C
0
0
-
0
J
0
0
0
-
0
0
0
0
0
-
0
0
0
0
0
0
-
0
0
0
0
0
-
0
0
D
B
9
10A
10B
10C
10D
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26A
26B
26C
26D
26E
26F
27
28
29
30
31
32
33
34
35
17
18: Evaporative-Condensed Chiller Accessories
0 = None (No Evaporative-Condenser)
A = No Sump Heat
B = Sump Heaters
19: Blank
0 = None
20: Blank
0 = None
21: Chiller Compression Tank
0 = None
A = AX-15V
B = AX-20V
C = AX-40V
D = AX-60V
E = AX-80V
F = AX-100V
G = AX-120V
H = AX-180V
J = AX-200V
K = AX-240V
L = AX-260V
M = AX-280V
22: Boiler Compression Tank
0 = None
23: Blank
0 = Standard
24: Chiller Accessories
0 = None
A = Glycol chiller
B = Air Separator
C = Thermometers & Pressure Gauges
D = Chemical Pot Feeder
E = Auto Glycol Feeder
F = Option A + B
G = Option A + C
H = Option A + D
J = Option A + E
K = Option B + C
L = Option B + D
24: Chiller Accessories Continued
M = Option B + E
N = Option C + D
P = Option C + E
Q = Option D + E
R = Option A + B + C
S = Option A + B + D
T = Option A + B + E
U = Option A + C + D
V = Option A + C + E
W = Option A + D + E
Y = Option B + C + D
Z = Option B + C + E
1 = Option B + D + E
2 = Option C + D + E
3 = Option A + B + C + D
4 = Option A + B + C + E
5 = Option A + B + D + E
6 = Option A + C + D + E
7 = Option B + C + D + E
8 = Option A + B + C + D + E
25: Blank
0 = Standard
26A: Blank
0 = Standard
26B: Blank
0 = Standard
26C: Blank
0 = Standard
26D: Blank
0 = Standard
26E: Blank
0 = Standard
26F: Blank
0 = Standard

LZ Series Feature String Nomenclature
Model Options
:
Unit Feature Options
GEN
MJREV
SIZE
SERIES
MNREV
VLT
A1
A2
A3
A4
A5
B1
B2
B3
B4
1
2
3A
3B
3C
3D
4A
4B
4C
4D
5A
5B
5C
5D
6
7
8A
8B
8C
LZ
A
-
140
-
C
-
A
-
3
-
F
A
C
0
E
-
0
0
0
0
:
E
0
-
0
0
0
0
-
0
0
0
0
-
0
0
0
0
-
0
0
-
0
0
0
0
-
0
E
0
0
-
0
0
C
0
0
-
0
J
0
0
0
-
0
0
0
0
0
-
0
0
0
0
0
0
-
0
0
0
0
0
-
0
0
D
B
9
10A
10B
10C
10D
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26A
26B
26C
26D
26E
26F
27
28
29
30
31
32
33
34
35
18
27: Blank
0 = Standard
28: Blank
0 = Standard
29: Blank
0 = Standard
30: Blank
0 = Standard
31: Blank
0 = Standard
32: Blank
0 = Standard
33: Warranty
0 = Standard Warranty
D = Compressor Warranty Years 2-5
34: Cabinet Material
D = Galvanized Cabinet 6” Base Rail + Double Slope
Roof
H = Galvanized Cabinet 8” Base Rail + Double Slope
Roof
35: Paint & Special Pricing Authorizations
B = Premium AAON Gray Paint Exterior
E = Premium AAON Gray Paint Exterior + Shrink
Wrap
X = Special Pricing Authorization + Premium AAON
Gray Paint Exterior
1 = Option X + Shrink Wrap
4 = Special Pricing Authorization + Special Exterior
Paint Color
7 = Option 4 + Shrink Wrap

19
General Information
AAON LZ Series chiller outdoor mechanical
rooms are complete self-contained liquid
chilling units. They are assembled, wired,
charged, and run-tested. Models are available
for air-cooled and evaporative-condensed
applications. Chiller primary pumping
packages, primary/secondary pumping
packages, and boilers with pumping package
are available as optional features.
Codes and Ordinances
LZ Series units have been tested and
certified, by TL, 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 LZ Series units must conform
to the ICC standards of the International
Mechanical Code, the International Building
Code, 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.
WARNING
RISK OF ELECTRICAL SHOCK
Electrical raceways are located in the
upper wall sections of the unit. DO
NOT CUT OR DRILL into the wall
sections of the unit that are within 12
inches of the roofline.
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

20
If repairs must be made to damaged goods,
then the factory should be notified before any
repair action is taken in order to protect the
warranty. Certain equipment alteration,
repair, and manipulation of equipment
without the manufacturer’s consent may void
the product warranty. Contact AAON
Technical Support for assistance with
handling damaged goods, repairs, and freight
claims: [phone].
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. Leave all internal packaging in place
and secure all loose-shipped items.
Outdoor Mechanical Room
Failure to observe the following instructions
will result in premature failure of your
system, and possible voiding of the warranty.
Never turn off the main power supply to the
unit, except for complete shutdown. When
power is cut off from the unit, any
compressors equipped with crankcase heaters
cannot prevent refrigerant migration. 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 liquid enters the
compressor.
COMPRESSOR CYCLING
3 MINUTE MINIMUM OFF TIME
To prevent motor overheating
compressors must cycle off for a
minimum of 3 minutes.
3 MINUTE MINIMUM ON TIME
To maintain the proper oil level
compressors must cycle on for a
minimum of 3 minutes.
The cycle rate must not exceed 6
starts per hour.
WARNING
Before unit operation, the main power
switch must be turned on for at least
24 hours for units equipped with
crankcase heaters.
CAUTION
Rotation must be checked on all
MOTORS AND COMPRESSORS of
three phase units. All motors, to
include and not be limited to pump
motors and condenser fan motors,
should all be checked by a qualified
service technician at startup and any
wiring alteration should only be made
at the unit power connection.
CAUTION