AAON Heating and Cooling Products

LZ Series

AAON LZ Series chillers and outdoor mechanical rooms are engineered for premium performance and superior serviceability. Variable capacity compressors and high efficiency air-cooled or evaporative-cooled condensers are available to maximize performance. All models feature double wall rigid polyurethane foam panel construction with walk-in service compartments that allow maximum accessibility when installing and maintaining the equipment. LZ Series chillers can also be provided with factory engineered and installed pumping packages and factory installed boilers, eliminating the need for an indoor mechanical room.

AAON LZ

Variable Capacity Centrifugal Compressor

Applications

Microchannel air-cooled condenser chillers with capacities from 45-200 tons and high efficiency evaporative-cooled condenser chillers with capacities from 53- 540 tons, for comfort or process cooling requirements, while maximizing the performance of the chiller.
Heat pump and waterside economizer configurations can meet difficult design applications while maintaining high unit efficiencies.
Units are available in factory installed primary or primary/secondary pumping systems in either constant or variable flow configurations.
Glycol chillers are available for refrigeration or low ambient applications.

Construction

The LZ Series Chillers is constructed from two inch double wall rigid polyurethane foam panels that provide R-13 thermal resistance, making the unit more rigid and resistant to damage, while reducing the radiated compressor and pump sound.
Factory assembled and tested components, piping between pumps and the components, and wiring to accept a single-point electrical connection.
Controls, compressors, evaporator and water system are accessed through a lighted walk-in cabinet that shields components and service personnel from weather and the outdoor elements year round.
Factory installed, microprocessor controlled, three chemical, water treatment system is standard with an evaporative-cooled condenser saving installation and maintenance time and money.
Compressors are installed with rubber isolation mounts on structural decks for quiet and efficient operation.
Access doors with full length stainless steel hinges and zinc cast lockable handles, make the unit easily serviceable.
Designed for outdoor operation, the LZ Series includes corrosion resistant exterior paint which exceeds a 2,500 hour salt-spray test.

Air-Cooled Condenser

Air-cooled condenser designed for quiet, energy efficient operation.
Coils are sloped to prevent fin damage and coils facing outwards are protected by perforated metal screens.
VFD controlled variable speed condenser fans are available for head pressure control at off-design ambient conditions.
Low ambient option allows cooling operation at 0°F.
Polymer e-coated air-cooled condenser coils are available to extend the life of the coils and protect them in corrosive environments.

Evaporative-Cooled Condenser

Factory installed evaporative-cooled condenser is available for ambient wet bulb condensing.
AAON engineered evaporative-cooled condenser, with air-cooled de-superheater and VFD controlled variable speed condenser fans, uses 22-100% less water than a conventional evaporative-cooled condenser and require 22-100% less chemical usage than a conventional evaporative-cooled condenser.
Interior of evaporative cooled condenser is constructed of 304 stainless steel and other non-corrosive materials.
De-superheater coils include polymer e-coating for corrosion protection.
AAON evaporative-cooled condensing saves costs when compared with a water-cooled chiller system because the water treatment system is factory installed and evaporative-cooled condensing does not require field installation of a cooling tower or condenser water pumping.

Variable Capacity Compressors

VFD controlled variable speed R-410A scroll compressors are available for load matching cooling and improved part load efficiency.
Turbocor variable capacity R-134a centrifugal compressors are available, providing load matching cooling capabilities, with quiet, energy efficient operation.
During part load operation, reducing compressor capacity saves system operating costs.
Low turndown capabilities minimize the water loop volume required to maintain a stable setpoint temperature.

Chiller Pumps

Pump systems can be factory installed in the LZ Series chiller. This saves valuable interior building space by eliminating pumps in the indoor mechanical room.
All pump packages include a factory installed in-line air separator, strainer, pump, and combination valve (isolation, check, and flow balancing) in the water system.
Redundant and dualArm pumps are available for system for standby or parallel pump systems.
Grooved end piping and fittings are standard with LZ Series chillers.

Conventional Boiler

Factory installed natural gas boilers, with input capacities from 500-6,000 MBH, save interior mechanical room space and provide energy efficient heat.
One to four boilers, in 500, 600, 700, 750, 800, 1,000, 1,300 and 1,500 MBH input capacities, are available within a single LZ Series outdoor mechanical room for extra capacity or redundancy.
Both 20°F ΔT and 40°F ΔT boilers are available for application flexibility, operating at 88% thermal efficiency with NOx ratings less than 9.9ppm.
Boiler heating modulation, from 10 to 100%, is achieved using a VFD to control combustion air and an air-fuel ratio modulating gas valve.
The boiler's design includes the very best of existing copper tube and copper-finned boiler technology.
The combustion chamber is completely enclosed in a stainless steel compartment.
For additional reliability, the boiler's electrical spark-to-pilot ignition utilizes a UV scanner to prove pilot before main gas valves open.

Condensing Boilers

Factory installed natural gas condensing boilers, with input capacities from 500-6,000 MBH, save interior mechanical room space and provide energy efficient heat.
One to four boilers, in 500, 600, 700, 750, 800, 1,000, 1,300 and 1,500 MBH input capacities, are available within a single LZ Series outdoor mechanical room for extra capacity or redundancy.
Both 20°F ?T and 40°F ?T boilers operate with up to a 98% thermal efficiency, a fully modulating burner and a low NOx rating.
The boiler heat exchanger is constructed of stainless steel and the burner includes direct-spark ignition.
These boilers also include factory provided controls with a built-in cascading sequencer to optimize operation.

Boiler Pumps

LZ Series units with boilers are available with factory designed and integrated primary/secondary pumping with either constant or variable flow.
Pump and water piping systems can be factory installed in the outdoor mechanical room. This saves valuable interior building space by eliminating pumps in the indoor mechanical room.
VFD controlled pumps provide precise control and reduced power consumption at part load.
All pump packages include a factory installed in-line air separator, strainer, pump, and combination valve (isolation, check, and flow balancing) in the water system. Grooved end piping and fittings is standard.
The LZ Series can include dualArm pumps for system standby and parallel pumping systems.
AAON selection software allows quick and easy selection of proper pumping package components and includes pump performance curves and water piping diagram.

Controls

Microprocessor controls are compatible with BACnet®, Modbus®, Johnson N2™, and LonTalk® protocols.
Color-coded wiring matches unit specific color-coded wiring diagram which is laminated and permanently affixed inside the control compartment.
Control components are labeled to simplify service and scheduled maintenance.
Factory run test and inspection reports are included in the documentation compartment affixed to the interior of the control compartment access door.

Features and Options

Staged or VFD controlled variable speed R-410A scroll compressors or Turbocor variable capacity oil-free magnetic bearing R-134a centrifugal compressors are available for load matching cooling and increased part load efficiency.
Insulated shell and tube evaporators are factory installed in each unit.
Service and control walk-in vestibule can be independently heated and/or cooled for comfort while periodic maintenance is performed on the unit.
Factory installed option boxes increase unit space for field installed components or for increased interior working area.
Variable speed condenser fans are available to increase unit efficiency at part-load and low ambient conditions, increase operating temperature range, and reduce sound levels.
Low ambient control on one or all refrigeration circuits are available for mechanical cooling during decreased ambient temperatures.
Glycol chillers for refrigeration applications.
Polymer e-coated condenser coils can be specified to extend the life of the coils and protect them in corrosive environments.
Optional factory installed compressor isolation valves, water system thermometers, and pressure gauges save installation time at the job site.
Diaphragm expansion/compression tanks can be preengineered and factory installed.

LZ Model	Condenser Type	Boiler Input Capacity	Waterside Economizer	Width	Height	Length
Turbocor R-134a Centrifugal Compressors Chillers
090	Air-Cooled	400-6,000 MBH	50-450 tons	142	104	Length varies depending on size and options selected.
120
181
090	Evaporative-Cooled
120
150
180
181
240
300
360
450
540
R-410A Scroll Compressors Chillers
045	Air-Cooled	400-6,000 MBH	50-450 tons	142	104	Length varies depending on size and options selected.
055
060
075
095
105
120
140
170
200
053	Evaporative-Cooled	400-6,000 MBH	50-450 tons	142	104	Length varies depending on size and options selected.
061
069
078
106
121
134
161
193
239
274
319
356
401
441
478

All dimensions are in inches
*Length may vary depending on options selected
Design cfm may be 30-50% greater or less than nominal cfm.

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