Frequently Asked Questions

Always refer to your manual that is included with each unit or feel free to give us a call!




What do I Need to Hook my Unit Up?

Our temperature control units are “plug and play”. Simply hook up your water source (water tower, city, or chiller) and a proper electrical source (3/60/230, 3/60/460, 3/60/575). Then be sure to check that the pump is running in the correct rotation.



How Long should I Vent my Water System for?

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 approx. 3 minutes.


My Water Unit Doesn’t Heat Up but the Heat Light is Lit on the Panel?

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 problem persists, please call us.


How Long will the Seals Last?

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


My Water Unit Shuts Down every time the Unit Calls for Cooling. What can cause this?

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 drain to increase pressure.



How long should I Vent my Oil Unit for?

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 Instructional Video.


What if my Unit Heats up, but my Process is Remaining Cool?

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


What Heat Transfer Fluid should I use and how often should I change it?

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

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



Why won't my Chiller Restart after I Performed Maintenance on it?

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.


What Could Happen if a Chiller is Undersized?

If a chiller is undersized, the compressor will run continuously and never achieve the desired set temperature.



Where is Delta T Systems Located and where are their Products Manufactured?

Delta T Systems is located at 2171 Highway 175 in Richfield, WI. We have been manufacturing temperature control equipment and portable chillers for over 23 years here in Wisconsin.


How do I Order Equipment or Replacement Parts from Delta T Systems?

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 .


What Does Delta T Systems Manufacture?

Delta T systems prides themselves on their high quality units, and as a leader in all industrial markets you can be assured we have a solution to meet your processing specifications. Water and oil circulating temperature control units and portable chillers are what we do best. We also offer replacement parts for competitive units at 20-30% below average retail costs.


Why Should I Buy a Delta T Product Versus a Competitor Product?

One look inside our shop and you will see the difference! High quality, dependable products, backed by knowledgeable technical support is just a few reasons we sit above our competition. The fact that we answer the phone by the second ring is another reason customers prefer to deal with us. Contact us for more reasons you should choose Delta T Systems.


Can Delta T Custom Design a System Specific to My Needs?

If your needs don’t quite fit in “the box”, we will engineer a special design that is outside many other manufactures’ offerings.