STULZ worldwide

Efficient and 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.

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Product Overview

At a glance Benefits Features Technical Data

Most important benefits

  • Microchannel condensers for improved heat transfer, less refrigerant and lower air-side pressure drops for maximum performance
  • Two independent refrigerant circuits ensure high redundancy.
  • Thanks to its compact size and light weight, the unit is suitable for almost every installation.

Most important features

  • Easy and thus cost-effective transport via ISO container all over the world
  • Outdoor installation on the roof or next to the building
  • Suitable for outdoor temperatures from -40°C to +45°C
  • Cold water outlet temperatures from -7°C to +25°C possible

Most important technical data

  • 138 models in 10 sizes
  • Cooling capacity (kW): 80 – 1,200
  • Microchannel condensers for improved heat transfer, less refrigerant and lower air-side pressure drops for maximum performance
  • Two independent refrigerant circuits ensure high redundancy.
  • Thanks to its compact size and light weight, the unit is suitable for almost every installation.
  • Generous switch gear cabinet with space for numerous optional electrical accessories and the customer’s individual requirements for chilled water generation
  • Low TCO thanks to Free Cooling
  • Electronic expansion valve as standard controlled by the SEC.blue electronic controller
  • Easy and thus cost-effective transport via ISO container all over the world
  • Outdoor installation on the roof or next to the building
  • Suitable for outdoor temperatures from -40°C to +45°C
  • Cold water outlet temperatures from -7°C to +25°C possible
  • Available in 138 combined models:
    • Free Cooling
    • Low noise
    • Scroll and screw compressor
  WPAmini WPA WSA
Cooling capacity 80 – 160 160 – 565 370 – 1,200
Refrigerant R410a R410a R134a (GWP: 1,430)
(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

Height (mm):
2,316
Length (mm):
3,140 – 7,130

Depth (mm):
2,208 – 2,208

Height (mm):
2,406 – 2.406
Length (mm):
4,255 – 11,980

Depth (mm):
2,278 – 2,278

Height (mm):
2,473 – 2,473

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Language
Please Select Explorer WPA - German
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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.

Model overview for your mission-critical applications

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 

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 temperature2. 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 temperature2. 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.

 

 

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

Reference: Stadium Galgenwaard

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

Read our Stadium Galgenwaard project story

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. 

Learn more about our Test Centers

Please be aware that our product portfolio may vary in some countries. For more information on availability, please visit the respective country page of our subsidiaries.

Here you will find an overview of our locations.

Is the cooling solution you require not available in your region? Please feel free to contact us! Together we will find a solution - we look forward to hearing from you.

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Andorra United Arab Emirates Afghanistan Antigua and Barbuda Anguilla Albania Armenia Angola Antarctica Argentina American Samoa Austria Australia Aruba Azerbaijan Bosnia and Herzegovina Barbados Bangladesh Belgium Burkina Faso Bulgaria Bahrain Burundi Benin Bermuda Brunei Bolivia Brazil The Bahamas Bhutan Bouvet Island Botswana Belarus Belize Canada Cocos (Keeling) Islands Congo Central African Republic Congo-Brazzaville Switzerland Côte d’Ivoire Cook Islands Chile Cameroon China Colombia Costa Rica Cuba Cape Verde Christmas Island Cyprus Czech Republic Germany Djibouti Denmark Dominica Dominican Republic Algeria Ecuador Estonia Egypt Western Sahara Eritrea Spain Ethiopia Finland Fiji Falkland Islands Micronesia Faroes France Gabon United Kingdom Grenada Georgia French Guiana Ghana Gibraltar Greenland Gambia Guinea Guadeloupe Equatorial Guinea Greece South Georgia and the South Sandwich Islands Guatemala Guam Guinea-Bissau Guyana Hong Kong SAR of China Honduras Croatia Haiti Hungary Indonesia Ireland Israel India British Indian Ocean Territory Iraq Iran Iceland Italy Jamaica Jordan Japan Kenya Kyrgyzstan Cambodia Kiribati Comoros Saint Kitts and Nevis North Korea South Korea Kuwait Cayman Islands Kazakhstan Laos Lebanon Saint Lucia Liechtenstein Sri Lanka Liberia Lesotho Lithuania Luxembourg Latvia Libya Morocco Monaco Moldova Madagascar Marshall Islands North Macedonia Mali Myanmar Mongolia Macao SAR of China Northern Marianas Martinique Mauritania Montserrat Malta Mauritius Maldives Malawi Mexico Malaysia Mozambique Namibia New Caledonia Niger Norfolk Island Nigeria Nicaragua Netherlands Norway Nepal Nauru Niue New Zealand Oman Panama Peru French Polynesia Papua New Guinea Philippines Pakistan Poland Saint Pierre and Miquelon Pitcairn Islands Puerto Rico Portugal Palau Paraguay Qatar Reunion Romania Russia Rwanda Saudi Arabia Solomon Islands Seychelles Sudan Sweden Singapore Saint Helena, Ascension and Tristan da Cunha Slovenia Svalbard Slovakia Sierra Leone San Marino Senegal Somalia Suriname São Tomé e Príncipe El Salvador Syria Eswatini Turks and Caicos Islands Chad French Southern Territories Togo Thailand Tajikistan Tokelau Turkmenistan Tunisia Tonga Timor-Leste Turkey Trinidad and Tobago Tuvalu Taiwan Tanzania Ukraine Uganda United States Minor Outlying Islands United States Uruguay Uzbekistan Vatican City Saint Vincent and the Grenadines Venezuela British Virgin Islands US Virgin Islands Vietnam Vanuatu Wallis and Futuna Samoa Yemen Mayotte South Africa Zambia Zimbabwe Palestine Åland Heard Island and McDonald Islands Montenegro Serbia Jersey Guernsey Isle of Man Saint Martin Saint Barthélemy Bonaire, Sint Eustatius and Saba Curaçao Sint Maarten South Sudan Kosovo
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