Explorer Line

Air-cooled chiller system for mission critical applications

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Reliable cooling for project-specific requirements

The STULZ Explorer Line is a series of air-cooled chiller systems that is suitable for numerous different uses. The units of this product series combine high-quality components with the ability to fulfill project-specific requirements. We offer a portfolio of state-of-the-art industrial water chillers that are kind to your budget and flexible enough to be adapted to all customer requirements.

Industry

Optimized for process and industrial cooling

Data center

Our units are designed for highest requirements and maximum reliability

Free Cooling

Maximum potential savings by using cool outside air

Compact unit

Maximum cooling capacity with a minimal footprint

Product Overview

At a glance

Most important benefits

Microchannel condensers for improved heat transfer, less refrigerant, lighter weight and lower air-side pressure drops
Two independent refrigerant circuits ensure redundancy

Most important features

Easy transport via ISO container
The air-cooled chiller system available with Free Cooling and as a Low Noise version

Most important technical data

Cooling capacity (kW): 80 – 1,200

Benefits

Microchannel condensers for improved heat transfer, less refrigerant, lighter weight and lower air-side pressure drops
Two independent refrigerant circuits ensure redundancy
Generous switch gear cabinet with space for numerous optional electrical accessories and the customer’s individual requirements

Features

Electronic expansion valve as standard controlled by the SEC.blue electronic controller
Easy transport via ISO container
The air-cooled chiller system available with Free Cooling and as a Low Noise version

Technical Data

	WPA_mini	WPA	WSA
Cooling capacity	80 – 160	160 – 565	370 – 1,200
Refrigerant	R410a	R410a	R134a (GWP: 1,430)
Refrigerant	(GWP: 2,088)	(GWP: 2,088)	R513a (GWP: 573)
Compressor	Scroll	Scroll	Screw
Cooling circuits	2	2	2
Level (%)	25 – 100	17/25 – 100	12,5 – 100
Dimensions	Length (mm): 3,650 Depth (mm): 1,370 Hight (mm): 2,316	Length (mm): 3,140 – 7,130 Depth (mm): 2,208 – 2,208 Hight (mm): 2,406 – 2.406	Length (mm): 4,255 – 11,980 Depth (mm): 2,278 – 2,278 Hight (mm): 2,473 – 2,473

STULZ Chiller Range - Video

All details about Explorer (Line)

Climate. Customized.

From standard units to fully customized solutions

The ability to offer such a wide range to customers is the embodiment of our philosophy, "Climate. Customized.". Size, design, cooling capacity or control: STULZ's Explorer Line can be precisely adapted to your individual requirements. In addition, a variety of options and equipment are available to achieve the optimum result.

Learn more about Climate. Customized.

Applications for the STULZ Explorer air-cooled water chillers' range

Data center and telecommunications

Ambient air temperature: from -20°C to +45°C
Chilled water: inlet +12°C to >+22°C
Chilled water: outlet +7°C to >+18°C

Process and industrial cooling

Ambient air temperature: from -20°C to +45°C

Chilled water: inlet +0°C to >+30°C

Chilled water: outlet -5°C to >+25°C

Comfort air conditioning

Ambient air temperature: from -20°C to +45°C

Chilled water: inlet +12°C to >+20°C

Chilled water: outlet +6°C to >+15°C

Reference: Stadium Galgenwaard

Chiller cooling for a soccer stadium: A project in collaboration of STULZ GROEP B.V., Jadikoel B.V. and Stadium Galgenwaard.

Learn more

STULZ Explorer air-cooled range

WPAmini: 80 – 160 kW

STULZ Explorer WPAmini

Air-cooled chiller systems for a cooling capacity of 80 to 160 kW

System limits

1. Ambient temperature			2. Chilled water limits
Version	Min	Max	Version	Min	Max
Standard	-10 °C	+55 °C	Standard	+5°C	+20°C
Free Cooling	-20 °C	+55 °C	Fluid low temperature	-5°C	+20°C
Free Cooling -40 °C	-40 °C	+55 °C

Free Cooling

The maximized surface of the Free Cooling coils enables the WPAmini to switchover into the Mix or FC mode very early. The air-cooled water chiller operating in Mix or FC mode reduces the compressor runtimes and thereby reduces the energy consumption to a minimum.

Options

Automatic transfer switch
Compressor soft start
Energymeter in the cabinet
Integrated pumps
Integrated buffer tank
Chiller available in different colors
Corrosion protection
Flow switch
Container transport

WPA: 160 – 565 kW

STULZ Explorer WPA

Air-cooled chiller systems for a cooling capacity of 160 to 565 kW

System limits

1. Ambient temperature			2. Chilled water limits
Version	Min	Max	Version	Min	Max
Standard	-10 °C	+55 °C	Standard	+5°C	+20°C
Free Cooling	-20 °C	+55 °C	Fluid low temperature	-5°C	+20°C
Free Cooling -40 °C	-40 °C	+55 °C

Free Cooling

The Free Cooling circuit of the WPA Explorer comprises copper-aluminum heat exchangers. A 3-way valve controlled by the STULZ SEC.blue controller ensures maximum performance and minimizes the operating time of the compressors. The operating times of the compressors can be minimized by the use of a Free Cooling circuit.

Options

Compressor soft start to decrease the electrical supply line upon start-up
Automatic transfer switch without neutral with automatic or manual changeover
Energy meter to transparently display the power consumption
Corrosion protection in the event of aggressive outside air
Coil protective grilles for protection from coarse contamination and vandalism
Fits into a container
and many more options

WSA: 378 – 1,200 kW

STULZ Explorer WSA

Air-cooled chiller systems for a cooling capacity of 370 to 1260 kW

System limits

1. Ambient temperature			2. Chilled water limits
Version	Min	Max	Version	Min	Max
Standard	-10 °C	+55 °C	Standard	+5°C	+20°C
Free Cooling	-20 °C	+55 °C	Fluid low temperature	-5°C	+20°C
Free Cooling -40 °C	-40 °C	+55 °C

Free Cooling

The Free Cooling circuit of the WSA Explorer comprises copper-aluminum heat exchangers. Two 2-way valves controlled by the STULZ SEC.blue controller regulate the flow of the chilled water through the Free Cooling coil. Operating costs can be reduced by use of the 2-way valves due to comparatively low pressure drops in the chilled water circuit. In addition, operating times and compressor utilization can be minimized by use of a Free Cooling circuit.

Options

Compressor soft start to decrease the electrical supply line upon start-up
Automatic transfer switch without neutral with automatic or manual changeover
Energy meter to transparently display the power consumption
Corrosion protection in the event of aggressive outside air
Coil protective grilles for protection from coarse contamination and vandalism
Fits into a container
and many more options

Indirect Free Cooling in the Explorer range

The STULZ Explorer range is available in Free Cooling version, which allows significant energy savings, mainly in cold and moderate climate. Free Cooling uses the external air to cool the fluid and may entirely replace the cooling circuit, enabling the compressors to be switched off.

Free Cooling calculator
Calculate the potential of Free Cooling at your location.

Operating modes

Compressor operation: In the case of high outside temperatures, the throughflow of the chilled water through the Free Cooling coil is blocked. The entire cooling capacity is generated with the help of the compressor.

Mixed mode: In the case of outside temperatures below the water inlet temperature, part of the cooling capacity is generated via the Free Cooling coil. The residual heat is dissipated via the refrigerant circuit.

Free Cooling: Depending on the water and outside temperature, the chilled water is exclusively cooled with the help of the outdoor temperature. Only the fans of the chiller are operated. The energy requirement is thus significantly reduced and the operating costs are minimized.

The STULZ Explorer range in particular

WPAmini: The maximized surface of the FreeCooling coils enables the WPAmini to switch-over into the Mix- or FC-mode very early. The chiller operating in Mix- or FC-mode reduces the compressor runtimes and thereby reduces the energy consumption to a minimum.

WPA: The Free Cooling circuit of the WPA Explorer water chiller unit comprises copper-aluminum heat exchangers. A 3-way valve controlled by the STULZ SEC.blue controller ensures maximum performance and minimizes the operating time of the compressors. The operating times of the compressors can be minimized by the use of a Free Cooling circuit.

WSA: The Free Cooling circuit of the WSA Explorer comprises copper-aluminum heat exchangers. Two 2-way valves controlled by the STULZ SEC.blue controller regulate the flow of the chilled water through the Free Cooling coil. Operating costs can be reduced by use of the 2-way valves due to comparatively low pressure drops in the chilled water circuit. In addition, operating times and compressor utilization can be minimized by use of a Free Cooling circuit.

Low noise

The compressors, fans and pumps are the only noise sources with the Explorer units. Depending on operating conditions, the noise level of the chiller can be reduced by up to 10 dB. To do this, the maximum fan speed is restricted during operation. Furthermore, cooling capacity that is comparable with the standard version can be attained with the low-noise version due to the matching of condensers and fans.

Figure right: Restriction of fan speed – To reduce noise emission, the fan speed is reduced by approx. 30% by the use of a star-delta circuit.

Air-cooled chiller systems: Control and monitoring

Programmable to project-specific requirements
Modern, high-resolution touch screen
Intuitive navigation
Update and event protocol via Micro SD
Ethernet, ModBus, RTU, HTTP, SNMP
Monitoring via Internet
Future-oriented hardware and software design

Service and maintenance

As a company with locations across the globe, we offer everything you need in the extremely dynamic world of information technology – plus professional advice in the right place at the right time.

Our trained and experienced sales and service partners are located in over 140 countries. The resulting proximity to our customers allows fast response times. In addition, regular training courses and an active exchange of information ensure high quality and an extensive knowledge of all our products. This way, you can be sure your products are in the best hands and get the right maintenance – all over the world.

Locations worldwide

Test Center

At our modern test center, each of our STULZ Explorer units is tested before leaving our plant grounds.

If you wish you also can request and witness a performance test under your individual operating and site conditions. This creates transparency and confirms the unit's performance and energy consumption.