Frequently Asked Questions

Since 1990, Delta T Systems has been a premier manufacturer of Water and Oil Temperature Control Equipment, Portable Air and Water-Cooled Chillers, and Industrial Central Chillers. Our cutting-edge temperature control solutions are engineered to deliver precision and reliability across a wide range of industrial processes.

We also offer replacement parts for competitive units at 20-30% below average retail costs.Learn more on our About Us page.

Delta T Systems is located at 2171 Highway 175 in Richfield, WI. We have been manufacturing temperature control equipment and portable chillers for over 35 years here in Wisconsin.

Delta T Systems TCUs and chillers are engineered for superior accuracy, reliability, and energy efficiency. Each unit includes advanced safety features, tool-free maintenance access, and DOE 2020–compliant pumps—all proudly designed and built in the USA.

Learn more on our Competitor Comparison page.  

Absolutely. We offer custom engineering and configuration options, including temperature range modifications, communication protocols (Ethernet/IP), and heater or pump sizing.

Absolutely! If your needs don’t quite fit into “the box”, we will engineer a special design that is outside the offerings of many other manufacturers.

Learn more on our Custom Designs page.

You can reach us by phone at 800-733-4204 or fax at 262-628-0332. You may also email us orders, quote requests, and questions to .

Learn more on our Parts, Service, & Units page.

Delta T Systems designs and builds a full range of water and oil temperature control units (TCUs), including compact, standard, upright, and open-tank configurations. Each model is engineered for precision, reliability, and ease of maintenance in demanding industrial environments.

Learn more about our Products.

We utilize centrifugal pumps that can be paired with variable frequency drives (VFDs) to deliver precise flow control, high energy efficiency, and low maintenance requirements.

The time will vary depending on the size of your process. Typically, you should watch the discharge pressure gauge while venting, and when the gauge is steady, the system should be vented of most air. If you have the “auto vent” option, your unit will vent for approximately 3 minutes.

Depending on the TCU, our temperature control systems operate from 0°F (-18°C) up to 550°F (288°C), covering applications from cooling to high-temperature process heating.

All Smart Series & Eco Series TCUs include solid-state heater contactors, motor overload protection, high-pressure safety relief, low-water protection, and temperature limit controls for dependable, safe operation.

Delta T Systems’ Eco Series features DOE 2020 efficiency-compliant pumps, modular heater tank design, lift-off service panels, and industrial-grade construction for superior durability and serviceability.

Learn more about the Eco Series TCU. 

Our temperature control units are “plug and play”. Simply hook up your water source (water tower, city, or chiller) and a proper electrical source following your local electrical code. Then be sure to check that the pump is running in the correct rotation.

Find more technical specifications, sizing application sheets, and equipment details on our Document Center page.

There may be dirt stuck in the drain solenoid valve; remove the dirt. If the problem persists, you will need to check that the heaters are pulling the correct amp draw, which can be found on the serial tag. If the problem persists, please call us: 800-733-4204.

Depending on the quality of the water being supplied to the system, the hours run per day, the temperature the unit is run, and if the unit is cooled down before shut off. Based on a 40-hour work week, seals typically last one year.

This is typically caused by either low water pressure to the unit or low flow rate to the unit. You can increase the incoming pressure or restrict the drain to increase pressure. If the problem persists, please call us: 800-733-4204.

Yes. Delta T Systems’ TCUs feature DOE 2020-compliant pumps and NFPA 79 electrical safety standards options across multiple configurations.

The time will vary depending on the size of your process. Follow the unit instructions included in the manual. You can also watch the discharge pressure gauge while venting, and when the gauge is steady, the system should be vented of air.

Watch our instructional video on the Delta T Systems Hot Oil Circulator Start-up Procedure.

First, make sure there are no closed valves on any lines or processes. Then check that the Fulflo Valve is not stuck wide open.

We recommend Bioblend as a heat transfer fluid in our temperature control units.

The length of use can vary greatly depending on various factors, including the temperature of the process, hours of operation per day, proper cool-down and shut-down techniques, etc.

Both. We manufacture portable air- and water-cooled chillers, as well as central chiller systems, to support a variety of facility layouts and process needs.

Check to be sure all the panels are back in place, then turn the power back on. There is also a timer on the compressor that may need to time out. If the problem persists, please call us: 800-733-4204.

If a chiller is undersized, the compressor will run continuously and never achieve the desired set temperature. Our team can help you determine the right size for your process or industry. You can also fill out one of our sizing application forms here.

A dry cooler, also known as a free cooler, is a cooling system that uses ‘free’ outside air to cool the process fluid in a heat exchanger. These systems are ideal for businesses seeking energy-efficient, low-maintenance alternatives to chillers, especially in climates where ambient temperatures frequently dip below process fluid requirements.

Learn more on our Dry Cooler System page.

A dry cooler is ideal when you need water cooling but want to reduce the load on a refrigeration system. It still requires water but offers an energy-efficient alternative for heat rejection in closed-loop systems.

Read more about When to Choose a Dry Cooler Over Other Cooling Options. 

Yes, with hybrid cooling systems. Hybrid chillers combine the best of both worlds. The system is designed to take advantage of the free cooling potential of the ambient air when the outdoor temperature is low enough to provide sufficient cooling and to switch to mechanical cooling when the outdoor temperature rises.

Dry coolers use ambient air instead of mechanical refrigeration to remove heat from process water, significantly reducing energy consumption. When outdoor temperatures are lower than the process fluid temperature, they provide “free cooling”.

Delta T Systems’ dry coolers are designed for maximum heat transfer efficiency and can integrate with chillers for hybrid operation, optimizing energy savings year-round.

Yes. We offer comprehensive customer support, from equipment selection and setup to troubleshooting and maintenance training.

All you have to do is fill out a contact form or call us at 800-733-4204 to speak directly with a knowledgeable representative— no automated loops, just a real person who can answer your questions and guide you to the right solution.

Our team can perform a process load analysis and recommend the most efficient and reliable system configuration for your specific requirements.

Industry 4.0 refers to the fourth industrial revolution. It connects machines, sensors, and systems to enable real-time monitoring, predictive maintenance, and improved process efficiency.

Delta T Systems’ TCUs and chillers are Industry 4.0-ready, offering advanced communication options and remote connectivity for smarter, data-driven temperature control.

Our temperature control solutions support a wide range of applications, including plastics processing, rubber manufacturing, cleanroom operations, food and beverage production, pulp and paper, pharmaceuticals, adhesives, and thermoforming.

Look through more industries we serve here.

They regulate mold temperatures and improve cycle consistency, directly impacting part quality and process efficiency.

Maintaining consistent heating and cooling in food and beverage processing helps ensure product safety, quality, and energy efficiency. This is crucial for both compliance and cost management.

Our high-temperature oil TCUs and precise process control capabilities improve material curing, viscosity management, and production consistency.

Dry cooling technology benefits industries that require efficient heat rejection without high water consumption, such as plastics processing, data centers, power generation, manufacturing, and chemical production.

Learn more about Common Industries That Benefit From Dry Cooling Technology.

They provide precise temperature control to maintain consistent heating and cooling rates throughout the process. This ensures stable vaporization and condensation, improving product quality, yield, and system efficiency across applications such as pharmaceuticals, essential oils, and chemical processing.

Learn more about Optimize Distillation Process with Delta T Systems’ Temperature Control Units.

Yes. Delta T Systems offers non-ferrous, corrosion-resistant TCUs and chillers that meet cleanroom standards.

Yes. We design energy-efficient, dry cooling systems that help maintain optimal temperatures for critical data center equipment.

Our TCUs deliver precise, consistent temperature control for melt systems used in adhesive, polymer, and resin processing. By maintaining uniform melt viscosity and preventing overheating, our units ensure higher-quality output, improved process stability, and reduced waste.

Learn more about Temperature-Controlled Melt Systems.