Choose the Correct Pump for Your Recirculating Chiller
Choosing the right type of pump is critical when configuring a Kodiak a recirculating chiller to meet your requirements. Using your system's pressure drop as the basic decision rule should help.
Ask yourself, "What is my system's pressure drop?" Overlay your system's pressure versus flow curve onto the chiller's pump curve. The intersection of the two curves indicates the expected flow through your system using this pump. Once you know the expected flow you can follow the Selecting a Recirculating Chiller example to ensure the system has enough capacity to remove your heat load. You may need to check several curves to find one which provides enough flow.
If you don't know your system's pressure drop, a positive displacement (PD) pump is recommended. The flow rate for a PD pump is independent of the system pressure drop. For system safety, this pump has an internal bypass which is factory set at 90 PSI. Therefore, if your system pressure drop is greater than 90 PSI this pump will operate in bypass mode. You will need to reduce your system's pressure drop by using shorter hoses with large diameters.
There are several other issues to consider when selecting a pump, like filters, lifetime, and cost.